WO2019006533A1 - Ensemble tamis pour machine de tamisage vibrante - Google Patents

Ensemble tamis pour machine de tamisage vibrante Download PDF

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Publication number
WO2019006533A1
WO2019006533A1 PCT/CA2017/050809 CA2017050809W WO2019006533A1 WO 2019006533 A1 WO2019006533 A1 WO 2019006533A1 CA 2017050809 W CA2017050809 W CA 2017050809W WO 2019006533 A1 WO2019006533 A1 WO 2019006533A1
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WO
WIPO (PCT)
Prior art keywords
screen
chassis
assembly
face
screen assembly
Prior art date
Application number
PCT/CA2017/050809
Other languages
English (en)
Inventor
Dale R. Marshall
Dan Pomerleau
Original Assignee
Fp Canmechanica Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fp Canmechanica Inc. filed Critical Fp Canmechanica Inc.
Priority to PCT/CA2017/050809 priority Critical patent/WO2019006533A1/fr
Publication of WO2019006533A1 publication Critical patent/WO2019006533A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4645—Screening surfaces built up of modular elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/469—Perforated sheet-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/02—Fastening means for fastening screens to their frames which do not stretch or sag the screening surfaces

Definitions

  • the present disclosure relates to vibrating screening systems for the separation of solids and fluids, particularly to screen assemblies for such systems.
  • Screening machines are used to separate such solids and liquids.
  • screen assemblies such as shaker screen assemblies
  • a screening machine typically includes a screen bed, comprised of individual screen assemblies, over which a material (e.g. slurry or another solution) containing fluids and solids is passed, and which is then subjected to various separation forces including gravity and shaking.
  • the g-force provided by the screening machine to the material decreases in an apparently linear relationship.
  • the center of the screen may oscillate at a rate higher than the oscillation rate of the vibrating machine, which in turn may increase the rate of wear of the screen assembly.
  • oscillations in the center of the screen assembly may cause a metal mesh of the screen to wear out at an increased rate. Therefore, it is desirable to use lighter screen assemblies to reduce the direct loading of the screening machine and allow for a more optimized performance.
  • a conventional screen assembly may include a steel tubular frame having cross ribs, and the sheet metal substrate, with a screen mesh thereon, laminated to the top.
  • Conventional screen assemblies may be partially composed of plastic (such as polyurethane), but such conventional screen modules typically show little or no weight decrease over conventional metal screen modules.
  • Such modules generally include metal tubing that is combined with plastic, in order to provide a structure with enough rigidity to overcome inertial issues when the screen module is subjected to frequency, amplitude, and mass forces present in a vibrating screening machine.
  • a screen assembly for a vibrating screening machine for use screening a material
  • the screen assembly comprising: a screen chassis comprising a first face and a second face opposite to the first face; a first screen for screening the material, the screen being attached to the first face of the screen chassis, the screen assembly having first and second opposite sides and a length between the first and second sides, wherein the screen assembly has a bowed shape, when not mounted in the vibrating screening machine, such that the first screen and the first face of the screen chassis have a concave curvature along the length of the screen assembly.
  • the screen chassis defines a plurality of passages therethrough from the first face to the second face for allowing passage of the material thus screened, and the first screen covers the passages of the screen chassis at the first face.
  • the first screen is detachable from the screen chassis and replaceable.
  • the screen assembly is mountable on and securable to a screen support frame of the vibrating screen machine such that the screen assembly is flattened against the screen support frame when secured.
  • said flattening of the screen assembly tensions the first screen.
  • the screen assembly is securable to the mounting frame by attachment means at the first and second opposite sides.
  • the attachment means comprise at least one of: wedges; and clamps.
  • the first screen is an upper screen and the first face of the chassis is an upper face.
  • the first screen is attached to the screen chassis by a plurality of fasteners, the fasteners maintaining the curvature of the screen assembly.
  • the plurality of fasteners comprises an array of mechanical fasteners, each fastener extending through the first screen and into the screen chassis.
  • the first face of the screen chassis faces substantially upward when the screen assembly is mounted in the vibratory screening machine.
  • the first screen comprises a frame and a screening layer, the frame defining at least one opening, the at least one opening at least partially overlaying the openings of the screen chassis, the frame being attached to the screen chassis, the screening layer covering the at least one opening of the frame.
  • the screen assembly further comprises a second screen for screening the material, the second screen being attached to the second face of the screen chassis.
  • the second screen comprises: a second frame defining at least one opening; and a second screening layer that covers the at least one opening of the second frame.
  • the second screen is detachable
  • a method comprising: providing a screen assembly for a vibrating screening machine, the vibrating screening machine comprising a screen support frame, the screen assembly comprising: a screen chassis having a first face and a second face opposite to the first face; and a first screen, for screening the material, attached to the first face of the screen chassis, the screen assembly having first and second opposite sides and a length between the first and second side, and the screen assembly having a bowed shape such that the first screen has a concave curvature along the length; mounting the screen assembly on the screen support frame the vibrating screening machine such that the first screen faces away from the support frame; and securing the screen assembly on the screen support frame, comprising flattening the screen assembly against the screen support frame.
  • securing the screen assembly on the mounting frame comprises securing the screen assembly on the screen support frame by at least one of : wedges and clamps.
  • the screen support frame comprises a generally upward facing support surface
  • mounting the screen assembly comprises mounting the screen assembly such that the second face of the screen chassis faces the support surface and the first face of the screen chassis faces generally upward.
  • the screen chassis comprising a first face and a second face opposite to the first face and first and second opposite sides, the screen chassis defining a plurality of passages therethrough from the first face to the second face for allowing passage of a material that has been screened, the screen being for screening material; placing the screen on the screen chassis, the screen covering the passages of the screen chassis at the first face; securing the screen chassis and the screen in a bowed position; and while the screen chassis and the screen are thus secured, attaching the screen to the screen chassis.
  • the method further comprises releasing the screen chassis and the screen from being secured in the bowed shape.
  • securing the screen chassis and the screen in the bowed shape comprises securing the screen chassis and the screen to a fixture having a support surface having a non-uniform height to thereby bow the screen chassis and the screen.
  • the fixture comprises raised extensions that align with the first and second sides of the screen chassis.
  • Figure 1 is a top perspective view of a single screen assembly according to one embodiment
  • Figure 2 is a bottom perspective view of the single screen assembly of Figure 1 ;
  • Figure 3 is a bottom perspective view of a plastic chassis of the screen assembly shown in Figures 1 and 2;
  • Figure 4 is a top plan view of the chassis shown in Figure 3;
  • Figure 5 is a bottom plan view of the chassis of Figures 3 and 4;
  • Figure 6 is a cross-section view of the chassis of Figure 5, taken along the line B-B shown in Figure 5
  • Figure 7 is a cross-section view of the chassis of Figure 5, taken along the ling C-C shown in Figure 5;
  • Figure 8 is an enlarged cross-section view of a portion of the chassis within circle E in Figure 7;
  • Figure 9 is an exploded view of the screen assembly from Figures 1 and 2, but with the addition of a second metal screen to form a dual screen assembly;
  • Figure 10 is a top perspective view of a dual screen assembly
  • Figure 1 1 is a bottom perspective view of the screen assembly of Figure 10;
  • Figure 12 is a bottom plan view of the screen assembly of Figures 10 and 1 1 ;
  • Figure 13 is a cross section view of the screen assembly of Figure 12 taken along the line A-A shown in Figure 12;
  • Figure 14 is an enlarged view of the portion of the screen assembly within the circle D in Figure 13;
  • Figures 15 is a top perspective view of a single screen assembly according to yet another embodiment
  • Figures 1 6 is a bottom perspective view of the screen assembly of Figure 15;
  • Figure 17 is a top plan view of a chassis of the assembly shown in Figures 15 and 16;
  • Figure 18 is a bottom plan view of a chassis of Figure 17;
  • Figure 19 is an enlarged partial cross sectional view of the chassis of Figure 18 taken along the line D-D in Figure 18;
  • Figure 20 is a side view of the chassis of Figures 17 and 18;
  • Figure 21 is a top plan view of an upper metal screen of the screen assembly shown in Figures 15 and 1 6;
  • Figure 22 is a bottom plan view of a lower metal frame of the screen assembly shown in Figures 15 and 1 6;
  • Figure 23 is a top plan view of the assembled screen assembly of Figures 15 and 16;
  • Figure 24 is a cross section side view of the screen assembly of Figure 24 taken along the line L-L in Figure 23;
  • Figure 25 is a cross section top view of the screen assembly of Figure 24 taken along the line P-P in Figure 24;
  • Figure 26 is a cross section bottom view of the screen assembly of Figure 23 taken along the line R-R in Figure 24;
  • Figure 27 is an exploded view of a stacked screen assembly according to yet another embodiment;
  • Figure 28 is perspective view of stacked screen assembly of Figure 27, as assembled
  • Figure 29 is a flowchart of a method accordance to some embodiments.
  • Figure 30 is a top view of a metal frame according to another
  • Figure 31 A is a perspective view of a bowed screen assembly according to yet another embodiment
  • Figure 31 B is a cross-sectional perspective view of the screen assembly of Figure 31 A;
  • Figure 32 is a perspective view of an example vibration screening machine in which four screen assemblies are mounted;
  • Figure 33 is an enlarged view of the portion of the vibrating screening machine within the circle "A" in Figure 32;
  • Figure 34 is a perspective view illustrating assembly of the screen assembly of Figure 31 A and 31 B using a fixture according to one embodiment
  • Figure 35 is a perspective view of another example fixture that may be used for assembly of the screen assembly of Figure 31 A and 31 B;
  • Figure 36 is a flow chart of a method according to some embodiments.
  • Figure 37 is a flow chart of another method according to some embodiments.
  • a screen assembly (such as a shaker screen assembly) including a screen chassis to which is attached at least one screen for screening material (such as a solution or slurry containing solids and liquids).
  • the screen chassis has a first face and a second face opposite to the first face, and the screen chassis defines a plurality of openings therethrough from the first face to the second face for allowing passage of the material (e.g. slurry) that has been screened.
  • the screen is attached to the first face of the screen chassis and covers the openings of the screen chassis at the first face.
  • the screen may include a frame and a screening layer (e.g. a mesh) covering at least one opening in the frame.
  • the screen may include a perforated plate and may not include a frame.
  • the screen may be made at least partially formed of metal, such as sheet metal.
  • the frame (or perforated plate) may be formed of sheet metal.
  • a sheet metal perforated plate or frame for a screen may be substantially flat on a face of the chassis, or may also be folded over one or more sides of the chassis to add additional structural strength to the assembly.
  • the screen may provide wear resistance for surfaces exposed to a material (e.g. a solution such as slurry) to be screened, while the chassis may be made of a light, stiff material to allow for a lightweight screen assembly.
  • a material e.g. a solution such as slurry
  • Such a design may reduce the weight of the screening screen assembly to as little as 30-50% of conventional modules currently in use which have frames made of metal and/or metal-tube- reinforced plastic.
  • the screen may, for example, be made from any metal that can withstand abrasion and wear by materials to be screened, including but not limited to steel and stainless steel.
  • the metal screen may be at least partially formed from sheet metal.
  • a sheet metal punching process e.g. using a CNC punch machine
  • the screen is not made of metal.
  • Other possible materials for the screen include, but are not limited to ceramics and plastics such as polyurethane.
  • Embodiments are not limited to any particular material for the screen.
  • the screen chassis may comprise a hard, lightweight material such as hard plastic, aluminum, composite materials (e.g. carbon fiber), etc.
  • the chassis may be formed of a glass filled polypropylene, which may provide strength, temperature and chemical resistance for use in a vibratory screening machine.
  • a glass filled polypropylene is a composite of polypropylene and glass fiber (e.g. 20% glass fiber). Other materials such as steel may also be used.
  • Embodiments are not limited to any particular material for the screen chassis.
  • the chassis may be formed by any known method, including but not limited to molding.
  • the screen may be attached to the screen chassis by any method known in the art, including but not limited to staking (e.g. heat staking) mechanical fasteners or chemical adhesives.
  • the screen may be attached to the screen chassis during the molding process, for example by insert molding or overmolding.
  • the screen may be removably attached such that the screen and/or the screen chassis is replaceable.
  • the chassis is molded and the screen (or the frame of the screen) is made by punching sheet metal.
  • Production of a molded chassis and punched sheet metal may be machine automated and thus more controllable than a conventional process of welding a frame. This automated production may, therefore, reduce variability in the form and/or structural integrity of the screen assemblies.
  • the screen and/or screen chassis may be replaceable, which may improve the potential for recycling and reusability of the screen assembly.
  • a screen may be removably attached to a screen chassis, and a single chassis may be thereby used with multiple different screens (e.g. the screens may be swappable).
  • a single screen may be used with multiple screen chassis.
  • the screen assemblies described herein may also possibly include ceramic materials (e.g. in the chassis and/or screen) to not only provide enhanced life but changes in the surface tension between the filtering material and the fluids being separated.
  • the screen may have a grid-like frame and a mesh.
  • the grid-like frame may define openings which are covered by the mesh.
  • the frame and mesh of the screen may, for example, be metal.
  • the metal mesh may be attached to the metal frame of the metal screen by an adhesive, including but not limited to epoxy.
  • the screen chassis can have a grid-like frame so that openings in the grid align with the frame of the metal screen.
  • the screen chassis can be attached to a single screen (e.g. metal screen) on one face of the grid, or can be attached to two screens (e.g. metal screens), each on opposite faces of the grid.
  • the screen assembly may be oriented substantially horizontally, or at a slight angle to the horizontal, with the screen facing substantially upwards, so that the material (e.g. slurry) to be screened can fall onto the module to contact the screen.
  • Larger solids may be retained by a mesh or perforated surface of the screen, and smaller solids will pass through the screen and through the openings in the grid of the plastic chassis under the influence of gravity.
  • the term "mesh size” is used herein to denote the size of openings in the mesh.
  • perforation size refers to the size of holes or openings in a perforated surface such as a perforated plate. Thus, the mesh size or perforation size determines the size of solids that can pass through the mesh or the perforated surface.
  • the screens can have the same or different mesh sizes or perforation sizes.
  • the screen on the upper face of the module which first contacts the material or slurry to be screened may have a larger mesh size or perforation size, so as to screen out the largest solids and allow mid-size and smaller solids to pass through.
  • the screen on the lower face of the module which contacts the material or slurry which passes through the upper screen may have a smaller mesh size or perforation size, so that it can selectively retain solids which are small enough to pass through the upper screen.
  • FIGS 1 and 2 are, respectively, top and bottom perspective views of a single screen assembly 100 according to one embodiment.
  • the screen assembly 100 may, for example, be a shaker screen assembly for a vibrating screen machine.
  • the screen assembly 100 includes a chassis 102 and a screen 104 attached thereto.
  • the chassis 102 is made of hard plastic in this embodiment, although other materials (e.g. lightweight and stiff materials) may also be used as described above.
  • the screen 104 in this embodiment is made of metal although other materials may be used for the screen in other embodiments, as described above.
  • the metal screen 104 may be manufactured at least partially from sheet metal.
  • the screen chassis 102 defines a plurality of openings 120 therethrough to allow passage of material that has been screened.
  • the metal screen 104 includes a frame 142 that defines a plurality of openings 144, and a mesh (not shown) covers the openings 144.
  • the openings 144 of the frame 142 are generally aligned to the openings 120 of the chassis 102.
  • the openings 144 also have a size and shape that generally correspond to the openings 120 of the screen chassis 102, although the size and/or shape of openings in a frame may not correspond to the size and/or shape of individual openings of the screen chassis in other embodiments.
  • the screen assembly 100 having the plastic chassis 102 may be lighter than conventional screen assemblies, but still be structurally suitable for use in vibrating screening machines.
  • the screen assembly 100 may be used for separation of solids from a liquid (e.g. drill cuttings from drilling fluid), although embodiments are not limited to that particular application.
  • screen assemblies may also be used to separate different sizes of solids.
  • the screen assembly 100 has a generally rectangular shape with a rectangular top face 101 and a rectangular bottom face 103, and the top face 101 and the bottom face 103 are separated by a short distance.
  • the distance between the top and bottom faces 101 and 103 may be referred to as the thickness of the screen assembly 100.
  • the size and thickness of the screen assembly 100 may vary.
  • the screen assembly may be approximately 25 inches wide by 49 and 1 ⁇ 4 inches long by 2 inches thick.
  • size may vary based on the application and /or machine for which the screen assembly is intended. Thickness may also vary, for example, based on the properties of the material(s) used in its composition, FEA requirements, the specification of the vibrating screening machine, the intended application, etc.
  • non- rectangular screen assemblies could also be used.
  • the thickness of the chassis may be in the range of approximately 1 .5 to 2.5 inches for example (although embodiments are not limited to this range).
  • FIG 3 is a bottom perspective view of the plastic chassis 102 shown in Figures 1 and 2.
  • the plastic chassis 102 has first and second opposite short sides 106 and 108, and first and second opposite long sides 1 10 and 1 12.
  • the chassis 102 also has a first top face 1 14 and a second bottom face 1 1 6.
  • the terms "top” and “bottom” are used for ease of reference herein and not to limit the orientation of the chassis 102.
  • the top face 1 14 may face substantially upwards when the screen assembly 100 (shown in Figures 1 and 2) is mounted in a vibrating screen machine.
  • the chassis defines a plurality of openings 120 therethrough, from the top face 1 14 to the bottom face 1 16, which allow material that has been screened to flow through the chassis 102.
  • the direction parallel to the long sides 1 10 and 1 12 will be referred to as longitudinal, and the distance between the long sides 1 10 and 1 12 will be referred to as the width of the chassis 102.
  • the direction parallel to the short sides 106 and 108 will be referred to as transverse, and the distance between the short sides 106 and 108 will be referred to as the length of the chassis 102.
  • the distance between the top face 1 14 and the bottom face 1 16 of the chassis 102 will be referred to as the thickness of the chassis 102. Similar directions and dimensions will be used herein for other components and assemblies with similar rectangular shapes.
  • the chassis 102 has a grid structure (between the four sides 106, 108, 1 10 and 1 12 of the chassis 102) that defines the openings 120 of the chassis 102. More specifically, the chassis 102 includes a plurality of equally spaced apart ribs 126 in the longitudinal direction and a plurality of equally spaced apart cross ribs 122 and 124 in the transverse direction. In this embodiment, the ribs 126 extend between the first and second short sides 106 and 108, and the cross ribs 122 and 124 extend between the first and second long sides 1 10 and 1 12. The ribs 126 and cross ribs 122 and 124 are parallel to the first face 1 14 and second face 1 1 6 of the chassis 102.
  • the example ribs 126 and cross ribs 122 and 124 in this embodiment are in the form of plastic beams with cross-sectional profiles that are taller or deeper than they are wide. However, the shape and structure of ribs and cross ribs may vary.
  • the ribs 126 and cross ribs 122 and 124 alternate between full-depth cross ribs 122 and partial-depth cross ribs 124 (where "depth” refers to the vertical dimension of the cross ribs).
  • the full-depth cross ribs 122 have a depth
  • the partial-depth cross ribs 124 on the other hand extend from the top face 1 14 and only part of the way toward the bottom face 1 16.
  • the ribs 126 in this example also only extend part way from the top face 1 14 toward the bottom face 1 1 6.
  • the short sides 106 and 108 of the chassis 102 act as additional cross ribs in the grid structure.
  • each of the cross ribs 124 and 126 includes a tapered end 128 at the second long side 1 12 of the chassis, where the tapered ends 128 taper towards the top face 1 14 of the chassis.
  • the tapered ends 128 together give the second long side a sloped, tapered shape such that the top face 1 14 is wider than the bottom face 1 1 6.
  • the grid structure of the chassis 102 and the particular structure of the ribs 126 and cross ribs 122 and 124 is optional, and the structure of the chassis may vary in different embodiments.
  • the chassis may define a plurality of round holes, or a plurality of long channels extending substantially between two sides of the chassis. Embodiments are not limited to a particular configuration of openings in the chassis.
  • the first and second short sides 106 and 108 include first and second side walls 140 and 141 respectively.
  • the chassis includes 23 cross ribs 122 and 124 total between the side walls 140 and 141 , and five ribs 126 between the first and second long sides 1 10 and 1 12.
  • the side walls 140 and 141 also function as cross ribs.
  • the number of ribs and cross ribs in a grid structure, as well as the depth and thickness of the ribs and cross ribs may vary depending on the structural needs of the chassis and the material forming the chassis as well as other factors.
  • the size and number of openings defined by the chassis may also vary. The specific embodiment shown in Figure 3 is provided by way of example only.
  • FIG 4 is a top plan view of the chassis 102 shown in Figures 1 to 3.
  • Figure 4 shows the cross ribs 122 and 124 and the ribs 126.
  • the chassis 102 further includes a plurality of attachment points 130 distributed across the top face 1 14 of the chassis 102 for attaching the metal screen 104 (shown in Figure 1 ).
  • Several of the attachment points 130 are located at the intersection of the ribs 126 and cross ribs 122 and 124.
  • Other attachment points 130 are near the short sides 106 and 108.
  • Some of the attachment points 130 are provided on additional short ribs 132 that extend a short distance inward from the short sides 106 and 1 10.
  • the metal screen 104 may be attached to the chassis by mechanical means such as bolts, screws, rivets (e.g. plastic rivets), or using chemical adhesive or other means, at the attachment points 130.
  • the attachment points may be holes configured to accept and hold screws, or holes for a rivet or holes to accept a threaded insert to which a bolt or screw can be inserted, this would facilitate the re-use of the chassis to be refitted with a new screen.
  • One possible means of mechanical attachment is staking, in which plastic bosses from the chassis would extend through
  • Figure 5 is a bottom plan view of the plastic chassis 102, again showing ribs 126 and cross ribs 122 and 124.
  • Figure 6 is a cross-section view of the chassis 102 taken along the line B-B shown in Figure 5.
  • Figure 7 is a cross-section view of the chassis 102 taken along the line C-C shown in Figure 5.
  • the relative depths/heights of the full-depth ribs 122, the partial-depth ribs 124 and the ribs 126 are shown in Figures 6 and 7.
  • the cross ribs may all have a uniform depth, possibly extending the full thickness of the chassis.
  • partial-depth ribs such as partial- depth ribs 124 in Figures 1 to 7
  • ribs and cross ribs may form channels (e.g. between the full-depth cross ribs 122 of the chassis 102 shown in Figures 6 and 7) for material to move between the dual screens and out of an open side or outlet of the assembly.
  • Screen assemblies are typically mounted to a screening machine by one or two sides of the screen assembly.
  • the screen assembly 100 shown in Figures 1 and 2 may be mounted by clamping or wedging the first and second short sides 106 and 108 of the chassis 102 into position.
  • the long sides 1 10 and 1 12 may not be secured.
  • the full-depth cross ribs 122 of the screen assembly 100 may provide more structural stiffness and support than the partial- depth cross ribs 124 and the ribs 126.
  • the full-depth cross ribs 122 extending in the transverse direction may provide structural support and resistance to warping in response to the force applied to the short sides 106 and 108 from mounting the assembly 100.
  • the screen assembly 100 may have a slight intentional bow along its length (e.g. along the direction of the long sides 1 10 and 1 12).
  • the screen assembly 100 may, for example, bow approximately 3 to 4 mm.
  • the bow may be added during the process of fastening the metal screen 104 to the frame 102. Any suitable method for slightly bowing the screen assembly 100 may be used.
  • the screen assembly 100 may be bowed in a concave manner, when viewed from above. When installed, the screen assembly 100 may be held in place by two wedges (not shown) that are driven in on the first and second, shorter, sides 140 and 141 only. This may flatten out the screen assembly 100 and also further increase screen tension.
  • This mounting method may also help ensure there is full contact and/or seal along the long sides 1 10 and 1 12 of the screen assembly 100 when installed. This may help ensure that the screen assembly 100 is tight to the shaker of the screening machine and that the screen assembly oscillates at the same frequency as the shaker itself.
  • the wedges may compress the assembly more on the short sides and less along the length, thereby increasing the likelihood of the screen assembly to oscillating at a different frequency than the shaker. This may result in poor performance and shorten life of the screen.
  • the screen may oscillate at, or as close as possible to the same frequency as the shaker itself, to possibly optimize the overall performance and extend the life of the screen.
  • the slight bowing and mounting method of the screen assembly 100 described above may improve overall performance and structural integrity of the screen assembly 100.
  • Other screen assemblies described herein and shown in the drawings may similarly be bowed before installation in the vibrating machine. Examples of bowed screen assemblies are shown in Figures 30 and 31 and described below.
  • FIG 8 is an enlarged cross-section view of the portion of the chassis 102 within circle E in Figure 7.
  • the short side 108 includes a wall 140 (with an L-shaped cross- section in this example) that may act as a mounting surface for mounting the screen assembly 100 (shown in Figures 1 and 2) in a vibrating screening machine.
  • the first short side 106 (shown in Figure 3) has a corresponding structure.
  • FIG. 3 shows a wall 140 (with an L-shaped cross- section in this example) that may act as a mounting surface for mounting the screen assembly 100 (shown in Figures 1 and 2) in a vibrating screening machine.
  • the first short side 106 shown in Figure 3
  • one or more sides do not include L-shaped side wall.
  • one or more sides may include two walls (e.g. ribs or cross ribs) close together (e.g. one inch apart) and joined by a series of short ribs or cross ribs. Such a configuration is shown in Figure 17 and discussed in detail below. Other configurations are also possible.
  • the frame 142 of the metal screen 104 is generally aligned with and covers with the grid structure of the chassis 102.
  • the frame 142 includes an outer rectangular frame portion 143 with the openings 144 therein.
  • the metal screen 104 includes a metal mesh (not shown) that covers the openings 120 and 140 to screen material (e.g. slurry) that passes over the screen assembly 100. The mesh is not shown so that other components are visible.
  • Metal screen 104 is attached to the chassis 102 by fasteners 146 (shown in Figure 1 ) at attachment points 130 (shown in Figure 4).
  • the fasteners may be bolts, screws, rivets, etc., to name a few examples. Any suitable means for attaching the metal screen to the chassis may be used, and embodiments are not limited to any particular attachment method.
  • the metal screen 104 is sized to cover the top face 1 14 of the chassis 102 (shown in Figure 4).
  • the combination of the lightweight, stiff chassis 102 with the metal screen 104 may provide a screen that weighs less than conventional screens while still providing sufficient structural durability.
  • the metal screen 104 may act as a sort of exoskeleton for the chassis 102 that provides structural support and resistance to wear (from vibrations and/or material being screened) during normal operation of a vibrating screening machine.
  • Figures 1 and 2 also show optional end cover 105 that covers non- tapered cross rib ends 148.
  • the metal screen 104 substantially covers the entire top face 1 14 of the chassis 102 (shown in Figure 3).
  • metal screen 104 In use, as material (e.g. slurry) to be screened falls on metal screen 104, larger solids are retained on the screen 104 while smaller solids pass through screen 104 and openings 144/120.
  • the metal screen 104 may provide some protection and wear resistance (from the material being screened) for the chassis 102.
  • the number of openings in the frame of the screen may be different (more or less) than the number of openings in the screen chassis.
  • the frame of the screen may include only one large opening (e.g. a single large rectangular opening) that at least partially overlays the openings of the screen chassis.
  • another screening layer may be used (e.g. a perforated layer) to cover the frame.
  • the screen does not include a frame and may, for example, be formed of a perforated plate (such as a perforated metal plate). For example, a perforated stainless steel plate could be used.
  • the screen assembly may be convertible between a single screen configuration and a dual screen configuration, where the assembly includes a second screen in the dual screen configuration.
  • the screen assembly 100 shown in Figures 1 and 2 may be converted into the dual screen assembly arrangement shown in Figure 9.
  • a metal screen may be placed on both the top face and the bottom face of the chassis.
  • Figure 9 is an exploded view of the screen assembly 100 from Figures 1 and 2, but with the addition of a second metal screen 107 on the bottom face 1 1 6 of the chassis 102 (shown in Figure 3).
  • Figure 9 shows the plastic chassis 102, the first metal screen 104 discussed above, the end cover 105, and the second metal screen 107.
  • the first metal screen 104 is attached to the top face 1 14 of the chassis 102, as described above.
  • the second metal screen is attached to the bottom face 1 1 6 of the chassis 102 (shown in Figure 3).
  • the second metal screen 107 is sized to fit over the bottom face 1 1 6, and has openings 146 that align with the openings 120 in the chassis 102.
  • the second metal screen 107 includes a frame 1 1 1 (generally aligned with the grid structure of the chassis 102) and a mesh (not shown) covering the openings 146 for screening the material.
  • the first, upper metal screen 104 may have a larger mesh size than the second, lower metal screen 107. That way, solids small enough to fit though the mesh of the first metal screen 104 may still be screened by the second metal screen 104.
  • the upper screen may have a perforation size that is greater than the mesh size or perforation size of the lower screen.
  • the end cover 105 may be removed and the lower metal screen 107 may be attached to the lower face 1 16 of the chassis 102.
  • the assembly 100 may be converted between single and dual screen configurations as needed.
  • the end cover 105 may be again placed on the assembly 100.
  • the lower metal screen 107 is not attached to the screen assembly 100, and in the dual screen configuration, the lower metal screen 107 is attached to the screen assembly 100.
  • the grid structure of the screen assembly 100 is bounded at three sides (i.e. has three closed sides). Specifically, the first and second side walls 140 and 141 form two closed sides (106 and 108).
  • the first long side 1 10 is bounded or closed by the end cover 105.
  • the second long side 1 12 (with the tapered cross rib ends 128 as shown in Figure 3) is open, such that debris caught between the first metal screen 104 and the second metal screen 105 may pass under the partial-depth ribs 124 and the ribs 126 and exit out the second long end 1 12.
  • the angled design of the second long side 1 12 (with the tapered rib ends 128 shown in Figure 3) may allow debris between the two screens 104 and 107 to exit to another screen assembly below.
  • Figures 10 and 1 1 illustrate another dual screen assembly 200 according to some embodiments. Like the screen assembly 100 shown in Figures 1 , 2 and 9, the screen assembly 200 may be converted between a single screen configuration and a dual screen configuration. A dual screen configuration is shown in Figures 10 and 1 1 .
  • Figure 10 is a top perspective view of the screen assembly 200
  • Figure 1 1 is a bottom perspective view of the screen assembly 200.
  • the screen assembly 200 includes a hard plastic chassis 202 that has a shape and structure similar to the chassis 102 shown in Figures 1 to 9.
  • the screen assembly 200 also includes an end cover 203 (shown in Figure 10) at a first long side 210, an upper metal screen 204, a lower metal screen 205.
  • the chassis 202 also includes first and second short side walls 206 and 208, which are opposite from each other.
  • the side walls 206 and 208 together with the end cover 203 bound three sides of the screen assembly.
  • Opposite to the first long side 210 with the end cover 203 is an open second long side 212, which is similar to the long side 1 12 of the screen assembly 100 shown in Figures 1 and 2.
  • the upper metal screen 204 includes frame 207 (shown in Figure 10) and mesh 239 covering the openings 220 and frame 207.
  • the mesh 239 is shown partially cut away in Figure 10 to provide better visibility of the frame 207.
  • other embodiments may use a perforated plate or another type of screening layer (other than a mesh).
  • the lower metal screen 205 may be removable to convert the screen assembly 200 to a single screen configuration.
  • the grid structure formed by the chassis 202 includes a series of ribs 126 and cross ribs 221 .
  • the ribs 226 are parallel to the long side wall 210 and are equally spaced apart between the long side wall 210 and the open second long side 212.
  • the cross ribs 221 are parallel to and equally spaced apart between the first and second side walls 206 and 208.
  • the cross ribs 221 include partial-depth ribs 222 and full-depth ribs 224 as shown in Figure 1 1 , and similar to the chassis 102 shown in figures 1 to 9).
  • the partial-depth ribs 222 and full-depth ribs 224 alternate similar to the chassis 102 shown in Figures 1 to 9.
  • the grid structure defines openings 220.
  • the cross ribs 221 and side walls 206 and 208 include tapered ends 236, similar to the cross ribs 122 and 124 of the screen assembly 1 00 shown in Figures 1 and 2.
  • the lower metal screen 205 in this embodiment includes a rectangular frame 231 defining openings 240 and includes mesh 241 covering the frame 231 openings 240.
  • the mesh 241 is also shown partially cut away in Figures 1 1 and 12.
  • the frame 231 of the lower metal screen 205 in this example includes more ribs 232 compared to the chassis 202 and first metal screen 204.
  • the frame 231 of the lower metal screen 205 defines approximately six ribs 232 space apart between two long sides 249 and 250 of the frame.
  • the frame 231 also includes cross ribs 234 that are generally aligned with the cross ribs 221 of the chassis 202 and upper metal frame 204.
  • the ribs 232 and cross ribs 234 of the lower metal screen form openings 240 that will be covered by the mesh (not shown).
  • the dual screen assembly 200 shown in Figures 10 and 1 1 has fewer ribs 226 in the grid structure formed by the chassis 202 and first metal screen 204 than the dual screen assembly example shown in Figure 9.
  • the number and configuration (e.g. spacing, thickness, length, angle, etc.) of the ribs and cross ribs may vary in other embodiments based on several factors.
  • the upper metal screen 204 is attached to the chassis 202 at array of fastening points by screws 242 (shown in Figure 10).
  • the lower metal screen 205 is similarly attached to the chassis 202 by several screws 244 (shown in Figure 1 1 ).
  • Other attachment means e.g. bolts, rivets, adhesives, welding, etc.
  • the lower metal screen 207 and the upper metal screen 204 may reinforce the chassis 202, like an exoskeleton, to provide a lightweight, sufficiently stiff screen assembly 200 suitable for vibrating screen machines.
  • the array of fastening points (shown with screws 242 in this embodiment) distributed across the upper metal screen 204 may further enhance structural performance.
  • the fastening points may provide for a fixed end support condition and a small zone that is loaded in compression around the fastener.
  • Figure 12 is a bottom plan view of the screen assembly 200 (including mesh 241 ).
  • the chassis 202, upper metal screen 204 and lower metal screen 205 are visible.
  • the open second long side 212 is also visible where debris can exit from between the upper metal screen 204 and the lower metal screen 205 in the area of the tapered rib ends 236.
  • Figure 13 is a cross section view of the screen assembly 200 taken along the line A-A shown in Figure 12.
  • the chassis 202, end cover 203, upper metal sheet 204 and lower metal sheet 205 are shown in Figure 13.
  • FIG. 13 shows a partial cross section of cross rib 221 as well as cross sections of two ribs 226.
  • Figure 14 also shows screws 242 and 244 that attach the upper metal screen 204 and the lower metal screen 205 respectively to the chassis 202 in this embodiment.
  • the mesh 239 of the upper metal screen 204 has a larger mesh size than the mesh 241 of the lower screen 205.
  • larger solids are retained on the upper metal screen 204 while mid-size and smaller solids may pass through the openings 220 and fall onto lower metal screen 205.
  • lower metal screen 205 has a smaller mesh size than upper metal screen 204, the solids that are smaller enough to fit through upper metal screen 204, but too big to pass through lower metal screen 205, may be retained on lower metal screen 205. Smaller solids may pass through lower metal screen 205.
  • FIGS 15 and 16 are, respectively, top and bottom perspective views of a single screen assembly 300 according to yet another embodiment.
  • the screen assembly 300 includes a hard plastic chassis 302, an upper metal screen 304 on a top face (shown in Figure 17) of the chassis 302, and a lower metal frame 305 on a bottom face (shown in Figure 18) of the chassis 302. Similar to embodiments described above, the assembly is rectangular in shape, and the upper metal screen 304 and the lower metal frame 305 are sized to cover substantially the entire top and bottom faces of the chassis 302. As discussed above, embodiments are not limited to chassis formed of plastic, or screens formed of metal.
  • the chassis 302 has a grid structure defining openings 320, similar to the chassis 102 and 202 discussed above with reference to Figures 1 to 14.
  • the upper metal screen 304 in this embodiment includes a frame 307 that defines openings 340 that have approximately the same size/shape and are aligned with the openings 320 in the chassis 302.
  • the lower metal from 305 also defines a plurality of openings including small openings 342 and large openings 344.
  • the large openings are sized similar to the openings 320 in the chassis 302, and each large opening 344 is aligned with a corresponding opening 320 in the chassis 302.
  • the lower metal frame 305 does not include a mesh covering its openings in this embodiment and is provided for structural support of the chassis. Material that passes through the upper metal screen 304 may pass through the openings 342 and 344 in the lower metal frame 305.
  • the upper metal screen 304 and the lower metal frame 305 may act as an exoskeleton providing structural support and provide protection/wear resistance for the plastic chassis 302.
  • the chassis 302 in this embodiment does not have an open side.
  • the chassis has four closed sides 306, 308, 310 and 312, which function as ribs/cross ribs in the grid structure.
  • FIG 17 is a top plan view of the chassis 302 shown in Figures 15 and 1 6.
  • the chassis 302 includes a first short side 306, a second short side 308 opposite to the first short side 306, a first long side 310, and a second long side 312 opposite to the first long side 310.
  • the chassis includes 23 cross ribs 322 parallel to and spaced equally between the short sides 306 and 308.
  • each of the cross ribs 322 is full-depth, extending the full thickness of the chassis 302 (similar to the cross ribs 122 of the chassis 102 shown in Figures 1 to 8).
  • the chassis 302 also includes a plurality of ribs parallel to and equally spaced between the long sides 310 and 312. As shown in Figure 24 and discussed below, the ribs 326 are partial- depth, extending only part way from the top face 314 of the chassis 302 (similar to the ribs 126 of the chassis 102 shown in Figures 1 to 8).
  • the hollows 332 extend from the top face 314 of the chassis 302 to the bottom face 31 6 shown in Figure 18.
  • the second short side 308 has a structure that corresponds to the first short side 306. This structure may provide a relatively thick side wall with the hollows 332 reducing overall weight.
  • the first and second long sides 310 and 312 are walls that essentially form ribs have a thickness approximately equal to the thickness of the other ribs 326 and cross ribs 322 of the chassis 102.
  • the chassis 302 also includes a plurality of additional short ribs 334 between the first short side 306 and the cross rib 322 closest to the side wall. Similar short ribs 335 are located at the second short side wall.
  • Figure 17 also shows attachment points 346 on the top face 314 for attaching the upper metal screen 304 to the chassis 302. Similar attachment points 348 are defined on the bottom face 31 6 (shown in Figure 18) for attaching the lower metal frame 305.
  • chassis 302 Some example dimensions of the chassis 302 will now be described. However, it is to be understood that the dimensions are provided by way of example only, and the chassis (including ribs, cross ribs, and chassis walls) may have different dimensions in other embodiments.
  • the chassis is approximately 25 inches wide by 49.25 inches long by 2 inches thick. Other sizes are also possible.
  • the ribs 326 and cross ribs 322 have an approximate thickness of 0.252 inches.
  • the attachment points 346 in this example are holes with an inner diameter of
  • Figure 18 is a bottom plan view of the chassis 302 shown in Figure 17.
  • the attachment points 348 in bottom face 316 for attaching the lower metal frame 305 (shown in Figure 16) are visible.
  • the cross rib 322 has side walls 338 and 339, which curve around the attachment points 346 and 348 to form the circular bulge 350.
  • the cross section of Figure 19 is taken at the widest point of the circular bulge 350.
  • the attachment point 348 is in the form of a hole 352 having hole wall 354.
  • the hole 352 is in the approximate center of the circular bulge 350.
  • the side walls 338 and 339 of the cross rib 322 are angled to each other by about 0.5 degree such that the cross rib 322 slightly narrows or tapers from the top face 314 to the bottom face 31 6.
  • This slight tapering or “draft” may be provided for molding purposes may aid in ejection of the molded chassis from the mold.
  • the circular bulge 350 in the cross rib 322 has outer diameter "od1 ", which is approximately 0.610 inches in this embodiment.
  • the circular bulge 350 has outer diameter "od2", which is approximately 0.580 inches.
  • the hole 352 has a diameter "od3", which is approximately 0.1 60 inches at the top face 314 of the chassis 302.
  • the hole wall 354 is angled such that the hole 352 slightly narrows as it extends into the chassis 302 from the top face 314, and the hole 352 has a diameter of approximately 0.148 inches near its bottom 356.
  • the hole 352 is approximately 0.754 inches deep in this example.
  • the hole 352 is shaped for receiving a bolt or rivet (not shown in Figure 18) to attach the upper metal screen 304 (shown in Figure 15) to the chassis 302.
  • the distance "d1 " from the circumference of the hole 352 to the circumference of the circular bulge 350 is approximately 0.225 inches.
  • the attachment point 348 at the lower face 316 is similar to the attachment point 346 in the upper face discussed above.
  • FIG 19 also shows, using stippled lines, the thickness "d2" of the lower metal frame 305.
  • the upper metal frame 307 is primarily loaded in compression and the bottom metal frame 305 is primarily loaded in tension.
  • the lower metal frame may be thicker than the upper metal screen.
  • the lower metal frame 305 is 14 gage (thickness d2 is approximately 0.075 inches).
  • the upper metal frame 307 may be 1 6 gage (about 0.0598 inches thick). Such an arrangement may improve the structural performance of the screen assembly 300.
  • the actual thicknesses of metal layers used for the screens and/or frames may vary and embodiments are not limited to a particular thickness or ratio of thicknesses.
  • the structural and screening performance of this type of screen assembly may be customized according to the application desired. Thicknesses of the screen frames and chassis, materials used for the screens and chassis, number and position of screws or other attaching hardware may all be selected for specific implementations and requirements. One or more screens may also be removed from the chassis and replaced in order to quickly customize and/or repair the screen assembly.
  • the actual dimensions and configuration of the screen assembly 300 may vary as discussed above. Dimensions may be chosen with the aim to have an equivalent, or close to equivalent G-force across the entire surface and as close to the shaker as possible. The G-force may be within a permitted tolerance, such as 5%, for example.
  • the position of the screen assembly on the machine may be a factor in the optimal screen configuration and structure. For example, a first position (referred to as No. 1 position) on a shaker machine may be the first to encounter fluid to screen and may be under the most stress. Thus, the screen assembly in that position may have top and bottom metal frame thickness than other, subsequent screen assembly positions on the machine.
  • a bolt (not shown) that is 0.75 inches long may be received in attachment point 348 to attach the lower metal frame 305 to the chassis 302.
  • the upper metal screen 304 may similarly be attached to the upper face 314.
  • the plurality of attachment points 346 and 348, together with corresponding bolts, screws or rivets, may securely attach the upper metal screen 304 and the lower metal frame 305 to the chassis.
  • Figure 20 is a side view of the chassis 302 showing the first long side 310.
  • the thickness of the chassis is indicated by "d3" in Figure 20. In this
  • the chassis is approximately 2 inches thick.
  • the short side 308 is at a slightly acute angle "a" from the bottom top face 314.
  • the angle a in this example is approximately 89.5 degrees. This angle (i.e. draft) may allow the chassis 302 to be more easily ejected from a mold when formed.
  • Figure 21 is a top plan view of the upper metal screen 304 showing the frame 307 of the metal screen and the mesh 309.
  • the mesh 309 is partially cut away so that the frame 307 is also visible. However, the mesh 309 will cover all of the openings 340 of the frame 307 for screening material that falls on the screen 304.
  • the mesh size of the mesh 309 may vary and may depend on the type of material to be screened. Similarly, for embodiments using a perforated plate (rather than a frame and mesh type screen), the perforation size may depend on the type of material being screened.
  • holes 360 are defined in the frame 307, and the holes 360 are arranged to align with the attachment points 346 in the upper face 314 of the chassis 302 (shown in Figure 17).
  • the holes 360 in this embodiment receive bolts or rivets to secure the upper metal screen 304 to the chassis 302.
  • any suitable method for attaching a metal screen to a chassis may be used.
  • the frame 307 of the upper metal screen 304 has a grid structure that is aligned with the chassis 302 shown in Figure 17.
  • the frame 307 of the upper metal screen 304 may be manufactured, for example, from sheet metal.
  • the sheet metal may be cut to form a rectangle that has the same size as the top face 314 of the chassis 302, and the openings 340 and holes 360 may be cut in the sheet metal.
  • the openings 340 and holes 360 could also be cut before or at the same time as the outer rectangle shape of the frame 307.
  • sheet metal for a frame of a screen or a perforated plate may be cut and folded along its edges so that it covers one or more sides or ends of the chassis as well as the top or bottom face of the chassis.
  • This folding of the sheet metal could cover substantially cover each side of the chassis for a single screen embodiment, for example.
  • three sides of the chassis could be covered by the sheet metal, with an open side not covered by the sheet metal so that material can still exit through the open side.
  • Figure 22 is a bottom plan view of the lower metal frame 305 that is to be attached to the bottom face 31 6 of the chassis 302 shown in Figure 18.
  • the lower metal frame 305 may also be manufactured from sheet metal, for example.
  • the lower metal frame 307 includes large openings 342 and small 344.
  • the large openings 342 are generally aligned with openings 320 of the chassis 302 that are nearest the long sides 310 and 312 of the chassis 302 (shown in Figure 1 6).
  • the frame 307 has a grid structure that, in comparison to the chassis 302, includes two additional ribs 362 and 363 that, when attached to the chassis 302, are spaced between the three center most cross ribs 322 of the chassis 302, thereby creating the smaller openings 344.
  • the small openings 344 are aligned such that pairs of small openings 344 cover respective single openings 320 of the chassis 302.
  • the size and/or arrangement of the openings on the lower metal screen may vary in some embodiments. By including smaller openings, the structural strength/stiffness provided by the lower metal screen may be improved. Thus, the design of the lower metal screen may vary depending on the required structural strength/stiffness required for a particular application.
  • the lower metal frame 305 also defines holes 366 that are arranged to align with the attachment points 348 in the lower face 31 6 of the chassis 302 (shown in Figure 18). The holes 366 in this embodiment receive bolts or rivets to secure the lower metal frame 305 to the chassis 302.
  • any suitable method for attaching a metal frame to a chassis may be used, as explained above.
  • the lower metal frame 305 in this example has no mesh or other screening layer.
  • the screen assembly 300 (shown assembled in Figure 23) may be considered a "single screen" assembly, although the chassis 302 is reinforced with the lower metal frame 305.
  • Figure 23 is a top plan view of the assembled screen assembly 300.
  • the mesh 309 is shown, but is again cut away to show other components of the screen assembly 300, including the metal frame 307 of the upper metal screen 304 and the lower metal frame 305.
  • Bolts 368 attaching the upper metal screen 304 to the chassis 302 are also shown in Figure 23.
  • Figure 24 is a cross section side view of the screen assembly 300 taken along the line L-L in Figure 23.
  • Cross sections of the cross ribs 322 are visible, as are the ribs 326.
  • the ribs 326 extend from the top face 314 of the chassis 302 and only part way to the bottom face, whereas the cross ribs 322 extend fully between the top face 314 and bottom face 316, thereby having a depth that equals the thickness of the chassis 302.
  • Figure 25 is a cross section top view of the screen assembly 300 taken along the line P-P in Figure 24.
  • the line P-P in Figure 23 is below the level of the ribs 326.
  • the cross ribs 322, but not the ribs 326, of the chassis 302 are visible in Figure 25.
  • Figure 25 also shows the lower metal frame 305.
  • Figure 26 is a cross section bottom view of the screen assembly 300 taken along the line R-R in Figure 24.
  • the ribs 326 and cross ribs 322 of the chassis 302 are visible in Figure 26.
  • Figure 26 also shows the upper metal screen 304 including the mesh 309.
  • Figure 30 is a top view of a lower metal frame 380, according to another embodiment, that could be attached to a bottom face of a chassis.
  • the frame 380 could be attached to the bottom face 316 of the chassis 302 shown in Figures 15 to 20 and 23 to 26 rather than the lower metal frame 305.
  • the lower metal frame 380 shown in Figure 30 has first and second opposite short sides 381 and 382 and first and second opposite long sides 383 and 384.
  • the lower metal frame 380 has a grid structure including longitudinal ribs 385 that extend between the first and second short sides 381 and 382.
  • the grid structure also includes a first set of several cross ribs 386 that are angled approximately 60 degrees to the ribs, and a second set of several cross ribs 387 that are angled approximately 60 degrees to the ribs (in the opposite direction) and to the first set of cross ribs 386.
  • This arrangement of ribs 385 and cross ribs 386 and 387 defines several triangle shaped openings 388 and several diamond shaped openings 390.
  • the openings 388 and 390 may allow screened material to pass through from the chassis.
  • the openings 388 and 390 may or may not be aligned with openings of the screen chassis.
  • the lower metal screen 380 also includes attachment points 392 (e.g.
  • the lower metal screen 380 may be attached to a screen chassis using any suitable means.
  • the grid structure of the lower metal screen 380 may provide structural support for a screen assembly when attached to a chassis.
  • a similar grid structure may also be used for the frame of a metal screen (upper or lower) in some embodiments.
  • FIG. 27 is an exploded view of a stacked screen assembly 400 according to one example embodiment.
  • the stacked screen assembly includes a first chassis 402, a second chassis 404, and a third chassis 406.
  • Each chassis has a rectangular shape (and thickness) that is similar to the chassis discussed above. However, the shape of the screen assemblies in other embodiments may vary.
  • the stacked screen assembly 400 also includes a first screen 408, a second screen 410 and a third screen 412.
  • each of the chassis 402, 404 and 406 is made of hard plastic (although plastic is not required in all embodiments).
  • the first chassis 402 and the second chassis 404 have a channel design. Specifically, with reference to the first chassis 402, the chassis 402 defines multiple long channels 414 between arms or extensions 41 6. The extensions 41 6 have a depth equal to the thickness of the chassis 402.
  • the first chassis 402 also has three closed sides 418, 420 and 421 and one opened side 422.
  • the second chassis 404 has the same structure as the first chassis 402, defining channels 424 and having one open side 426.
  • the third chassis 406 also defines channels 427, but has four closed sides 428, 430, 432 and 433 (and no open side).
  • the arms/extensions 41 6 have rectangular cross sectional profile in this example, but other shapes are also possible (e.g. circular profile).
  • Each of the first, second and third screens 408, 410 and 412 has a respective frame (not shown) and a respective mesh 434, 436 and 438 covering the frame.
  • the frames are shaped for mounting the first, second and third screens 408, 410 and 412 on the first, second and third chassis 402, 404 and 406 respectively.
  • the frames also have openings (not shown) that are aligned with the chassis 402, 404 and 406.
  • the mesh 434 of the first screen 406 may have the largest mesh size, and the third screen 412 may have the smallest mesh size.
  • Figure 28 shows the assembled stacked screen assembly 400, with the following components in order from the top: first screen 408, first chassis 402, second screen 410, second chassis 404, third screen 412, and third chassis 406.
  • Any suitable fastening means e.g. bolts, screws, rivets, welding, adhesives, etc. may be used to connect the screens (408, 410, 412) and the chassis (402, 404, 406) together.
  • solution e.g. slurry
  • solution e.g. slurry
  • the largest solids may be caught by the first screen 408, with remaining solids and liquid may flow down through the channels 414 (shown in Figure 27) of the first chassis 402 and onto the second screen 410.
  • the second screen may filter medium sized solids, which may then travel through the channels 414 and exit through the open side 422 of the first chassis 402.
  • the remaining solids that are not filtered out by the second screen 410 and the liquid may pass through the second screen 410 and onto the third screen 412.
  • the third screen 412 may then filter out smaller solid solids, which will then exit via the open side 426 of the second chassis 404.
  • the liquid and solids small enough to pass through the mesh 438 of the third screen 412 may exit through the channels 426 (shown in Figure 27) of the third chassis 406.
  • a fourth screen could be placed on a bottom face of the third chassis 406.
  • the third chassis could be modified to include an open side, similar to the first and second chassis 402 and 404 to allow screened solids to exit through the open side.
  • the stacking pattern shown in Figures 27 and 28 could include additional chassis and/or screens. Stacked screen assemblies are not limited to three chassis and three screens, and more or fewer chassis and screens may be used in other embodiments.
  • a chassis with channels such as first chassis 402 shown in Figure 27
  • a stacked screen assembly could use one or more chassis with a grid structure (such as the chassis 102 shown in Figure 3, or the chassis 302 shown in Figures 1 6 and 17). Other chassis arrangements may also be used.
  • a stacked configuration (such as the embodiment of Figures 27 and 28) may be used for situations where solids (such as particles) are to be separated in two or more different sizes.
  • the stacking shown in Figures 27 and 28 may also be repeated with additional screens and/or chassis as needed to provide the desired number of different separations.
  • Some embodiments of the screen assemblies described herein may be relatively lightweight and/or stiff, which may result in the screen being more wear resistant (resulting in increased longevity) compared to conventional screen assemblies.
  • the screen assembly of some embodiments may be less prone to center-screen vibrations at frequencies and/or amplitudes higher than the vibrating frequency of the machine.
  • some conventional screen assemblies may be rotated up to 90 degrees to the direction of material flow.
  • One or more embodiments described herein may avoid the need for such rotation to reduce wear or increase the lifetime of the screen assembly compared to conventional screen assemblies.
  • Some embodiments of the screen assemblies described herein may be cost effective to manufacture.
  • Some embodiments may by recyclable.
  • the mechanical attachment means for attaching the screen(s) to the chassis may allow the screen and chassis to be separated for recycling purposes and/or to be reused with a new screen(s).
  • FIG. 29 is a flowchart of an example method according to some embodiments.
  • a screen chassis is provided.
  • the screen chassis comprises a first face and a second face opposite to the first face, the screen chassis defining a plurality of openings therethrough from the first face to the second face for allowing passage of a screened material.
  • the screen chassis may, for example, be in the form of any example chassis described above (e.g. chassis 102, 202, 302, 402, 404 or 406 shown in Figures 3, 10, 17, 18 27 and 28).
  • a screen is provided.
  • the screen may be formed of metal as described above.
  • the screen includes a frame and a mesh, the frame comprising a plurality of openings that are aligned with the openings of the screen chassis, and the mesh covering the openings of the frame.
  • the screen may, for example, be in the form of any of the example metal screens described above (e.g. metal screens 104, 107, 204, 205, 304, 408, 410 or 412 shown in Figures 1 , 2, 9, 10, 1 1 , 15, 1 6, 21 , 22, 27 and 28).
  • the screen is attached to the screen assembly such that the metal screen covers the openings in the screen chassis.
  • the screen may be attached in any suitable manner described above.
  • Providing the screen chassis may include manufacturing, purchasing, or otherwise obtaining the screen chassis.
  • the screen chassis may be molded from a lightweight, stiff material including, but not limited to plastic.
  • Providing the screen may include manufacturing, purchasing, or otherwise obtaining the screen.
  • the screen may be at least partially manufactured from sheet metal (e.g. using a sheet metal punching process) as described above. More particularly, the screen may include a frame and/or perforated plate that is formed by a sheet metal punching process
  • the method may further include providing and/or attaching a second screen to the screen chassis on a face of the screen chassis that is opposite from the first metal screen.
  • the attaching may be accomplished by any suitable means, as described above.
  • the second screen may be attached to the second face of the screen chassis such that the screen covers the openings in the screen chassis at the second face.
  • any of the screen chassis described above may be provided separately from the metal screen.
  • some embodiments provide a screen chassis for attaching to a metal screen for use in a vibratory screen machine.
  • the screen chassis may, for example, be in the form of any of the chassis 102, 202, 302, 402, 404 or 406 shown in Figures 3, 10, 17, 18 27 and 28.
  • any of the metal screens and/or metal frames discussed above may be provided separate from the screen chassis.
  • the metal screen for attaching to and at least partially covering a screen chassis for use in a vibratory screen machine, the metal screen may, for example, be in the form of any of the metal screens 104, 107, 204, 205, 304, 408, 410 or 412 shown in Figures 1 , 2, 9, 10, 1 1 , 15, 1 6, 21 , 22, 27 and 28.
  • the metal screen(s) may be removable from the chassis such that multiple screens may be swapped or replaced as needed, while still using the same screen chassis.
  • the chassis may be replaceable.
  • removable attachment means such as screws or bolts could be used to facilitate screen replacement. This capability may not be provided by conventional screens.
  • the screen on a top face of a chassis may include a relatively durable perforated plate and/or mesh material for screening the material. Such durable perforated plates or mesh materials may outlast the lower screen material and possibly the screen chassis itself. The top screen comprising the more durable (and possibly expensive) material could then be used with a
  • the screen assemblies described herein may be somewhat bowed in a natural state (i.e. in the absence of external force), prior to being installed in the vibrating screening machine.
  • An example embodiment of a bowed screen assembly 3000 is described below with reference to Figures 31 A and 31 B.
  • Figure 31 A is a perspective view of the screen assembly 3000 according to yet another embodiment.
  • Figure 31 B is a cross-sectional perspective view of the screen assembly 3000 (with the cross section taken along the length of the screen assembly 3000).
  • the screen assembly 3000 comprises a chassis 3002 with an upper screen 3004 and a lower screen 3006 attached thereto.
  • the upper screen 3004 comprises a metal frame 3005 and a screening layer (e.g. similar to mesh 239 in Figure 10), which is not shown to provide a better view of the chassis 3002.
  • the lower screen 3006 comprises a metal frame 3003 and may also include a screening layer (not shown, but similar to mesh 241 in Figure 1 1 ).
  • the mesh size (i.e. size of openings in the mesh) of the lower screen 3006 may be smaller than the mesh size of the upper screen 3004.
  • the chassis 3002 may be made of a light weight material (e.g. plastic) that is sufficiently rigid and resilient, while the upper and lower metal frames 3005 and 3003 may be made of sheet metal or the like.
  • the upper and lower screens may be perforated sheet metal, with the perforations acting as the screening element rather than an additional mesh or other screening layer.
  • the upper and lower screens 3004 and 3006 may function similar to an exoskeleton on the chassis 3002, providing structural support.
  • the screen assembly is generally rectangular with long, open sides 3008 and 3009 and short, closed sides 3010 and 301 1 .
  • the chassis 3002 is a grid like structure that defines vertical passages 3013 between the upper and lower screens 3004 and 3006 for passage of material between the upper and lower screens 3004 and 3006.
  • the chassis also defines horizontal channels 3015 extending from the first long side 3008 to the second long side 3009 to allow passage of material that passes through the upper screen 3004 but is caught by the lower screen 3006 to exit the screen assembly 3000.
  • material may generally pass over the screen assembly from the second long side 3009 to the first long side 3008.
  • the chassis 3002 includes an upper extension 3017 along the length of the first long side 3008, which may partially overhang an adjacent, subsequent screen assembly (not shown). Screened material may exit the screen assembly 3000 from the first long side 3008 and continue onto the subsequent screen assembly. A preceding screen assembly (not shown) may similarly overhang the second long side 3009 of the screen assembly 3000. Fluid exiting from the preceding screen assembly may thus continue onto the screen assembly 3000 near the second long side 3009, which is beveled from the lower screen 3006 to the upper screen 3004.
  • Figure 32 shows an example arrangement of multiple adjacent screen assemblies 3000a to 3000d in an example screening machine 3200.
  • the screen assembly 3000 is bowed in an upward, concave fashion along its length between the short sides 3010 and 301 1 .
  • the curvature of the bow is along the long sides 3008 and 3009 and the upper screen 3004 is concavely curved along its length.
  • the screen assembly maintains its bowed shape in the absence of external force applied to the screen, meaning that the screen assembly 3000 is bowed prior to installation in a vibrating screening machine.
  • the screen assembly 3000 is also resilient in this example meaning that, applying force to flatten the screen assembly 3000 may increase tension in the screen assembly similar to a leaf spring.
  • the amount of bowing shown in Figures 31 A and 31 B is exaggerated for illustrative purposes. Typically, the degree of bowing may be less.
  • the screen assembly 3000 may bow approximately 3 to 5 mm along its length, although embodiments are not limited to any particular curvature.
  • the screen assembly 3000 in this example is flexible such that it may be flattened.
  • the chassis 3002 may be plastic or another generally rigid but slightly flexible material.
  • "flattening" the screen assembly refers to flexing or bending the screen assembly 3000 such that the assembly 3000 is no longer bowed, or is less bowed.
  • the bowed shape of the screen assembly 3000 may be provided in any suitable manner.
  • One example method of providing the bowed curvature is described below with reference to Figure 34.
  • FIG. 3007 An example screen support frame 3007 for a vibrating screening machine (such as machine 3200 in Figure 32) on which the screen assembly might be secured is shown.
  • the screen support frame 3007 is a generally rectangular, flat frame for bearing the screen assembly 3000.
  • "flat” does not necessarily mean a continuous flat, planar surface area, but rather that downward pressure on the screen assembly 3000 may cause it to flatten as it conforms to the screen support frame 3007.
  • the screen support frame 3007 comprises a generally upward facing support surface 3001 .
  • FIG. 3000 Some of an array of holes 301 6 in the upper screen and some of an array of holes in the chassis 3020 are visible in the cross section.
  • the holes 3016 and 3020 are aligned and receive screws 3018 or other fastening hardware to secure the upper screen 3004 to the upper face (not visible) of the chassis 3002.
  • the lower screen 3006 is similarly attached to the lower face (not visible) of the chassis 3002.
  • the upper screen 3004 and the lower screen 3006 may both be detached (e.g. by removing the screws 3018) and/or replaced by different screens.
  • the screen assembly 3000 may be easily repaired if one of the screens 3004 and 3006 is damaged or fails and/or customized for different applications.
  • the size, thickness, material, position and number of passages and fasteners, and/or other specifications of the screen assembly 3000 may be varied or chosen to customize the specific parameters of the screen assembly 3000 for use in a variety of applications.
  • the screen assembly 3000 of Figures 31 A and 31 B may be secured in a conventional vibrating screening machine (e.g. the machine 3200 shown in Figure 32) at the short sides 3010 and 301 1 .
  • Clamps, wedges or any other suitable securing means may be used to hold down and secure the short sides 3010 and 301 1 to a screen support frame (such as screen support frame 3007 in Figures 31 A and 31 B), thereby flattening and tensioning the screen assembly 3000.
  • the chassis of a bowed screen assembly may be a tubular metal frame or other suitable structure, and the screen may be attached thereto.
  • the screen may be attached to the tubular frame by fasteners (e.g. screws) or other means suited to induce or maintain a resilient bow in the screen assembly.
  • fasteners e.g. screws
  • Embodiments are not limited to the particular chassis or screen structure shown in Figures 31 A and 31 B.
  • Figure 32 is a perspective view of an example vibration screening machine 3200 in which four screen assemblies 3000a to 3000d are mounted in generally adjacent positions.
  • the screen assemblies 3000a to 3000d are each in the form of the screen assembly 3000 shown in Figures 31 A and 31 B.
  • Material to be screened may run over, and through, the four screen assemblies 3000a to 3000d to be screened, starting with the first screen assembly 3000a.
  • the four screen assemblies 3000a to 3000d are arranged in a cascading manner such that that material exiting from the first long side 3008a of the first screen assembly 3000 passes onto the upper screen 3004b of the second screen assembly 3000b, and so on.
  • FIG 33 is an enlarged view of the portion of the vibrating screening machine 3200 within the circle "A" in Figure 32.
  • the fourth screen 3000d is mounted on a rectangular screen support frame 3007d (similar to screen support frame 3007 in Figures 31 A and 31 B).
  • the screen assembly 3000d is secured on the screen support frame 3007d by a first wedge 3202 at the second short side 301 1 of the screen assembly 3000d.
  • the wedge 3202 sits on the screen assembly 3000d and is wedged between the screen assembly 3000d and an angled flange 3204, which extends from an inner side wall 3206 of the machine 3200, to hold the screen assembly 3000d down on the frame 3007. Friction may hold the wedge 3202 in place.
  • a second similar wedge (not visible) secures the opposite first short side 3010 (see Figure 31 A) of the screen assembly 3000d.
  • the bowed curvature of the fourth screen assembly 3000d is, thus, flattened out against the frame 3007.
  • Flattening the bowed fourth screen assembly 3000d in this manner creates tension (or further tension) in the upper screen 3004.
  • the screen assembly 3000d may thus, in effect, behave as an upside-down leaf spring.
  • This tensioning of the screen assembly 3000d may be beneficial for various reasons.
  • the tension from flattening the screen assembly 3000d may help ensure that good contact is maintained between the screen assembly 3000d and the screen support frames 3007d along the length of the screen assembly 3000d.
  • the screen assembly 3000d may also provide a more consistent G-force across the screen during operation of the vibrating screening machine 3200. This, may in turn, result in the screen assembly having a more uniform oscillating frequency across the areas of the upper screens 3004d and lower screen 3006d, thereby possibly extending life of the screen and reducing the likelihood of screen failure.
  • each of the first, second and third screen assemblies 3000a to 3000c are flattened and secured on respective frames 3007 with wedges 3202 in the same manner.
  • the screen assemblies 3000a to 3000c may be similarly tensioned and maintain better contact with the machine 3200.
  • alternate means may be used to secure and flatten the screen assemblies 3000a to 3000d in other embodiments.
  • clamps or other fastening means may be used to hold down sides of the screen assemblies.
  • Figures 1 to 28 to similarly provide a bowed shape.
  • Figure 34 is a perspective view of the screen assembly 3000 and an example first fixture 3400 that may be used when assembling the screen assembly 3000.
  • the first fixture 3400 is a generally rectangular block having an upper face 3402 and first and second opposite sides 3404 and 3406.
  • the upper face 3402 of the first fixture 3400 includes first and second raised portions (upward extensions) 3408 and 3410 along the first and second sides 3404 and 3406 respectively.
  • a shallow recess 3412 extends between the raised portions 3408 and 3410.
  • the first and second raised portions 3408 and 3410 generally align with the first and second short sides 3010 and 301 1 of the screen assembly 3000.
  • the chassis 3002 and upper screen 3004, still unattached, are placed on the first fixture with the first and second short sides 3010 and 301 1 positioned at the first and second raised portions 3408 and 3410 respectively.
  • the upper screen 3004 is positioned on the upper face (not shown) of the chassis 3002.
  • the upper screen 3004 is positioned to align the its holes 301 6 (see Figure 31 B) with the holes 3020 (see Figure 31 B) of the chassis.
  • the holes 301 6 and 3020 may be positioned in the chassis 3002 and the upper screen 3004 to properly align in the bowed position.
  • the chassis 3002 and upper screen 3004, thus positioned and aligned, are secured to the first fixture 3400 with the short sides 3010 and 301 1 raised with respect to a central portion 3030 which sits in the recess 3412, thus causing the chassis 3002 and upper screen 3006 to bow in a concave manner.
  • Securing the chassis and upper screen to the fixture may be accomplished by clamping the chassis 3002 and upper screen 3006 thereto.
  • a clamp in or near the central portion 3030 may be used to maintain the bowed shape.
  • Any suitable means for holding the chassis 3002 and upper screen 3006 in the bowed position on the fixture 3400 may be used.
  • the upper face 3402 including raised portions 3508 and 3410 thus form a non-uniform support surface for maintaining the bowed shape of the screen assembly 3000 while the upper screen 3004 is attached.
  • screws 3018 may be inserted into the aligned holes 301 6 and 3020, starting at the central portion 3030 of the upper screen and work towards the sides 301 1 and 3010. For example, after the screws 3018 may be placed moving progressively outward fashion, alternating from side to side with respect to the central portion 3030. The screws 3018 may thereby hold, or partially hold the bowed shape of the chassis 3002 and the upper screen 3004. Embodiments are not limited to screws for attaching the chassis 3002 and upper screen 3004. Other suitable attachment means (e.g. rivets, bolts, adhesive, welding, etc.) may be used. In Figure 34, two of the screws 3018a and 3018b are shown in an exploded position aligned with
  • the holes 3016 and 3020 may not be provided until the chassis 3002 and upper screen 3004 are secured in the fixture 3400.
  • the holes 301 6 and 3020 may be drilled with the chassis 3002 and upper screen 3004 held in the bowed positioned.
  • the bow When released from the first fixture 3400, the bow may relax or “spring back" to some degree, and the first fixture 3400 may be shaped to provide sufficient bowing to accommodate the relaxation while still resulting in a desired curvature.
  • the chassis 3002 and upper screen 3004 are removed from the first fixture 3400 of Figure 34, turned upside-down, and placed over the second fixture 3500 of Figure 35.
  • the screen assembly 3000 of Figures 31 A to 34 is not shown in Figure 35.
  • the second fixture has an upper face 3502 and includes a raised portion 3504 in the form of a ridge that is centrally located along the length of the fixture 3500.
  • the upper face 3502 including raised portion 3504 together form a non-uniform support surface for maintaining the bowed shape of the screen assembly 3000 while the lower screen 3006 (see Figure 31 A) is attached.
  • the lower screen 3006 is placed on and aligned with the chassis 3002.
  • the lower screen 3006, the chassis 3002 and the upper screen 3004 may then secured to the second fixture 3500 (e.g. with clamps or any other suitable means).
  • the lower screen 3004 is then attached using screws (not shown) or other attachment means similar to attachment process for the upper screen 3004 discussed above. Attachment of the lower screen 3006 in this manner may further reinforce the bowed shape of the screen assembly 3000.
  • the height of the raised portion 3504 may be chosen to provide the desired degree of bowing that takes the relaxation into account.
  • first fixture 3400 and the second fixture 3500 shown in Figures 34 and 35 are merely example structures that may be used to secure the bowed curvature while the upper and/or lower screens 3004 and 3006 are attached to the chassis 3002.
  • Various other fixture structures or means for holding the bowed shape may be used.
  • a fixture may have a continuous, concave surface on which the chassis 3002 sits.
  • a fixture may have a continuous, convex surface.
  • One or more other fixtures that provide nonuniform support surfaces that cause the screen assembly components (chassis and at least one screen) to bow when secured against the fixture may be used.
  • embodiments described herein are not limited to any particular process for making the screen assembly or providing the bowed shape.
  • FIG 36 is a block diagram of a method for making a screen assembly according to some embodiments.
  • a screen chassis and a screen are provided.
  • the screen chassis and the screen may be similar to one or more of the chassis and upper screens described above with reference to Figures 1 to 28 and 31 A to 31 B.
  • "Providing" the screen chassis and screen may include manufacturing, purchasing or otherwise obtaining the screen chassis and screen.
  • the screen is placed on the chassis. This may be accomplished as described above with reference to Figure 34, for example, in which the upper screen 3004 is placed on the chassis 3002 while sitting on the first fixture 3400.
  • the screen chassis and the screen are secured in a bowed position.
  • This may comprise securing the chassis and screen to a fixture, such as the fixture 3400 shown in Figure 34 and described above. Any suitable method for holding the chassis and screen in a bowed shape may be used.
  • the chassis and screen may be secured together at opposite ends (for example using clamps) and the ends may then be moved slightly toward one another to cause the chassis and screen to bow.
  • the screen is attached the chassis.
  • the attachment may comprise attaching the screen to the chassis with a plurality of fasteners such as screws, bolts, rivets, etc.
  • the chassis and the screen may then be released, but may maintain a bowed shape.
  • the release may comprise, for example, releasing the chassis and screen from the fixture (such as fixture 3400 in Figure 34.
  • the fasteners e.g. screws
  • the fasteners may continue to hold a bowed shape of the screen assembly.
  • the method may further include a similar process for attaching a second screen (such as the lower screen 3006 shown in Figures 31 A and 31 B), possibly using a second fixture (such as the fixture 3500 shown in Figure 35).
  • a second screen such as the lower screen 3006 shown in Figures 31 A and 31 B
  • a second fixture such as the fixture 3500 shown in Figure 35.
  • FIG. 37 is a block diagram of a method for installing a screen assembly in a vibrating screening machine according to some embodiments.
  • a screen assembly for a vibrating screening machine is provided.
  • the screen assembly may take the form of any of the screen assemblies described herein that include a chassis and upper and/or lower screens attached thereto. "Providing" the screen assembly may include manufacturing, purchasing or otherwise obtaining the screen chassis and screen.
  • the screen assembly is mounted on a generally flat screen support frame of the vibrating screening machine, such that the first screen faces away from the support frame.
  • the screen support frame may be in the form of the example frame 3007 of the vibrating screening machine 3200 in Figures 32 and 33.
  • the screen assembly is secured on the screen support frame, thereby flattening the screen assembly against the screen support frame.
  • securing the screen assembly to the vibrating screening machine comprises securing the screen assembly on the screen support frame. This may be accomplished using wedges or clamps, as described above.
  • the screen assembly may also include a second, lower screen on an opposite face of the chassis as described above with respect to other embodiments.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Abstract

L'invention concerne, selon un aspect, un ensemble tamis destiné à une machine de tamisage vibrante. L'ensemble tamis comporte un châssis de tamis et un tamis destiné à tamiser une matière telle qu'une solution contenant du liquide et des matières solides. Le châssis de tamis comprend une première face et une seconde face opposée à la première face. Le tamis est fixé à la première face du châssis de tamis. L'ensemble tamis a une forme arquée de sorte que le premier tamis a une courbure concave sur sa longueur. Le châssis de tamis peut être constitué d'un matériau rigide léger. Le tamis peut être constitué d'un matériau durable tel que le métal. L'invention concerne également un procédé de fabrication d'un ensemble tamis.
PCT/CA2017/050809 2017-07-05 2017-07-05 Ensemble tamis pour machine de tamisage vibrante WO2019006533A1 (fr)

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PCT/CA2017/050809 WO2019006533A1 (fr) 2017-07-05 2017-07-05 Ensemble tamis pour machine de tamisage vibrante

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WO2021003414A1 (fr) * 2019-07-02 2021-01-07 Derrick Corporation Appareils, procédés et systèmes pour criblage par vibrations
US11052427B2 (en) 2016-10-14 2021-07-06 Derrick Corporation Apparatuses, methods, and systems for vibratory screening
WO2021112808A3 (fr) * 2019-12-06 2021-07-15 Alapros Maki̇na Gida Sanayi̇ Ve Ti̇caret A.Ş. Amélioration de la caisse de crible de machines de type broyeur à crible

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US20080095980A1 (en) * 2006-08-16 2008-04-24 Hukki Ari M Screen element
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EP0706837A1 (fr) * 1994-10-14 1996-04-17 Isenmann Siebe GmbH Cadre de tamis
US20080095980A1 (en) * 2006-08-16 2008-04-24 Hukki Ari M Screen element
US20100307962A1 (en) * 2008-02-11 2010-12-09 M-I L.L.C. Preferential bow on composite screens
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US20160303612A1 (en) * 2013-11-12 2016-10-20 National Oilwell Varco, L.P. System and method for fabricating screen panel assemblies for vibratory separators
US20160175888A1 (en) * 2014-12-23 2016-06-23 Derrick Corporation Systems, apparatuses, and methods for securing screen assemblies
WO2016106450A1 (fr) * 2014-12-31 2016-07-07 Marshall Dale R Ensemble tamis pour machine de tamisage vibrante
CN105234076A (zh) * 2015-11-12 2016-01-13 哈尔滨纳诺机械设备有限公司 一种整粒机筛网及采用该筛网的摇摆整粒机的筛网机构

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US11052427B2 (en) 2016-10-14 2021-07-06 Derrick Corporation Apparatuses, methods, and systems for vibratory screening
US11731167B2 (en) 2016-10-14 2023-08-22 Derrick Corporation Apparatuses, methods, and systems for vibratory screening
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WO2021112808A3 (fr) * 2019-12-06 2021-07-15 Alapros Maki̇na Gida Sanayi̇ Ve Ti̇caret A.Ş. Amélioration de la caisse de crible de machines de type broyeur à crible

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