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WO1999000198A1 - Panneau de criblage moule, appareil et procede de fabrication - Google Patents

Panneau de criblage moule, appareil et procede de fabrication Download PDF

Info

Publication number
WO1999000198A1
WO1999000198A1 PCT/AU1998/000483 AU9800483W WO9900198A1 WO 1999000198 A1 WO1999000198 A1 WO 1999000198A1 AU 9800483 W AU9800483 W AU 9800483W WO 9900198 A1 WO9900198 A1 WO 9900198A1
Authority
WO
WIPO (PCT)
Prior art keywords
ribs
panel
parallel
screening surface
screen panel
Prior art date
Application number
PCT/AU1998/000483
Other languages
English (en)
Inventor
Raymond Maxwell Woodgate
Original Assignee
Lettela Pty. Ltd.
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 Lettela Pty. Ltd. filed Critical Lettela Pty. Ltd.
Priority to AU78991/98A priority Critical patent/AU725618B2/en
Publication of WO1999000198A1 publication Critical patent/WO1999000198A1/fr

Links

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
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4618—Manufacturing of screening surfaces
    • 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
    • B07B1/4681—Meshes of intersecting, non-woven, elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D28/00—Producing nets or the like, e.g. meshes, lattices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C2059/027—Grinding; Polishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/737—Articles provided with holes, e.g. grids, sieves

Definitions

  • the present invention relates to screening apparatus and more particularly to a moulded screen panel for use in such apparatus. It also relates to moulding dies for manufacturing and a method of manufacturing a moulded screen panel.
  • Screening apparatus of the type with which the invention is concerned is generally used for screening, grading or separating materials such as ores or other particulate or granular materials and comprises an array of screen panels removably fixed to a frame to provide a continuous screen deck. This deck is vibrated to move bulk materials over and through its screening surface.
  • Each screen panel of the array is commonly formed in one piece by moulding a resilient plastics material and is typically flat and square or rectangular in plan view and includes an upper screening surface from which apertures extend through the panel for allowing passage of bulk material as determined by the sizing of the apertures.
  • one die contains ribs for providing the parallel sided grooves and another die contains lugs for providing the apertures, and end surfaces of these ribs and lugs close against each other for moulding.
  • any flashing is formed because of inaccuracies in the dies at the locations where they are closed against each other, that flashing will be located at the entrances to the apertures below the screening surface, which makes it very difficult to remove.
  • This flashing formation problem can add considerably to the cost of manufacture of the screen panels due to both the cost of removing the flashing and the high costs that are incurred for maintaining the moulding apparatus in excellent condition in an attempt to avoid the flashing being formed.
  • a moulded screen panel including a series of equally spaced parallel ribs having upper surfaces which define an upper screening surface of the panel and side surfaces extending to bottom surfaces of the ribs to define a depth for the ribs, a plurality of cross ribs extending substantially orthogonally of the series of parallel ribs and having upper surfaces located below the upper screening surface, wherein the series of parallel ribs and the plurality of cross ribs define screening apertures which pass through the panel, wherein the side surfaces of each of the series of parallel ribs taper towards each other towards said bottom surfaces such that the cross-sectional area of each aperture increases from the upper screening surface over the depth of the ribs, wherein the location of the upper surfaces of the cross ribs relative to the upper screening surface and the spacing of
  • each continuous groove immediately over each cross rib are parallel.
  • each continuous groove is defined by a pair of opposing sides that taper away from each other, except for those portions over the width of a cross rib, which portions are substantially parallel and extend downwardly from the upper screening surface to the upper surface of a cross rib.
  • the panel includes strengthening ribs, some of which are parallel to said equally spaced parallel ribs and at least one other of which is parallel to the cross ribs, wherein the strengthening ribs have upper surfaces that are co-planar with the screening surface of the panel.
  • Said at least one other strengthening rib may be a centrally located rib which extends for the length of the panel.
  • the strengthening ribs that extend parallel to said equally spaced parallel ribs are offset from each other on either side of said at least one other strengthening rib to thereby divide the screening surface into panel segments.
  • the continuous grooves are continuous over at least one panel segment.
  • a die set for manufacturing a moulded screen panel comprising two dies, a first one of which includes parallel rows of upstanding tapered lugs for defining each aperture in the panel and wherein each lug has an end surface corresponding to the entrance opening of an aperture, the second die including a flat surface against which the end surfaces of the lugs of the first die close during a moulding operation, wherein the flat surface defines the screening surface of the panel and includes rows of upstanding parallel-sided lugs each of which has an end surface and each of which seats between two of the tapered lugs of the first die during a moulding operation, wherein the end surfaces of the parallel-sided lugs correspond to the upper surfaces of the plurality of cross ribs to thereby locate the upper surfaces of the cross ribs below the upper screening surface, wherein any flashing formed between the dies during a moulding operation and which may block or restrict the apertures is located at the upper surface of the
  • This second aspect of the invention includes the provision, individually, of one or the other of the two dies of the die set.
  • a method of manufacturing a screen panel according to the first aspect of the invention wherein the panel is moulded from a resilient plastics material using a die set according to the second aspect of the invention, wherein after removal of a screen panel from the die set, the upper screening surface of the panel is treated to remove any flashing at that surface.
  • the treatment accorded the screening surface of the panel may comprise grinding or buffing or any other suitable method for removing flashing.
  • Fig. 1 is a top plan view showing a portion of a moulded screen panel according to an embodiment of the invention
  • Fig. 2 is a view on section line II in Fig. 1
  • Fig. 3 is a view on section line III in Fig. 1
  • Fig. 4 is a view on section line IV in Fig. 1
  • Fig. 5 is a sketch of a perspective view of portion of a screen panel for illustrating some features of the invention.
  • Fig. 6 is a sectional view of portion of an embodiment of a die set according to the second embodiment of the invention, the dies being shown in a closed position, and
  • Fig. 7 is a view similar to Fig. 6 but showing the dies in a separated position after a moulding operation.
  • a screen panel 10 as shown in Fig. 1 is rectangular in plan shape and is cast or moulded (in this specification including the claims, the terms "moulding” or “moulded” are to be understood as encompassing “casting” or “cast”) from a plastics material, such as polyurethane. It includes an outer frame made up of opposed longitudinal sides 12 and opposed ends 14 (only one of which is shown) which may include one or more reinforcing elements such as metal rods (not shown). The bottom surface of sides 12 and ends 14 provides a bearing surface 16 that bears on support beams of a screen deck frame when the panel is mounted in such a frame with a plurality of other like panels to provide a screen deck.
  • Ends 14 include connection elements in the form of ribs 18 for fixing the panel in a screen deck.
  • connection elements in the form of ribs 18 for fixing the panel in a screen deck.
  • Screen panel 10 has an upper screening surface 20 for receiving ore or other particulate or granular material to be screened by means of apertures 22 which extend through the panel 10.
  • the apertures 22 are defined by a series of equally spaced parallel ribs 24 extending between longitudinal sides 12 and a plurality of cross ribs 26 extending substantially orthogonally to ribs 24 between opposed ends 14 (note that for clarity only the left hand side of Fig. 1 illustrates the ribs 24.
  • the equally spaced parallel ribs 24 each have an upper surface 28, which surfaces define the upper screening surface 20, and side surfaces 30 extending to a bottom surface 32.
  • the side surfaces 30 taper towards each other towards bottom surface 32.
  • the taper may be, for example, about 4°.
  • the cross ribs 26 each have upper surfaces 34 which extend between each of the parallel ribs 24 and which are located below the upper screening surface 20. This location of the surfaces 34 of cross ribs 26 relative to parallel ribs 24 effectively provide continuous grooves 36 extending across the panel 10. That is, the spacing between two adjacent ribs 24 effectively acts as a continuous groove 36 given that the upper surfaces 34 of the cross ribs 26 are located below the upper screening surface 20. As best seen in Fig.
  • Panel 10 also includes a central longitudinal strengthening rib 40 extending between opposed ends 14 and strengthening ribs 42, parallel to the equally spaced parallel ribs 24, extending between the opposed longitudinal sides 12 and central rib 40.
  • the strengthening ribs 42 are off-set from each other on either side of the central strengthening rib 40.
  • the strengthening ribs 40 and 42 have a substantial width and depth compared to the parallel ribs 24 and cross ribs 26 and their upper surfaces are co-planar with the screening surface 20.
  • the strengthening ribs 40 and 42 divide the screening surface 20 into panel segments and the continuous grooves 36 are continuous over at least one such panel segment. Thus the continuous grooves 36 that extend over one panel segment and which meet an offset strengthening rib 42 do not continue in that rib.
  • the strengthening ribs 42 do not contain any of the continuous grooves 36. This structure ensures that none of the material being screened can travel across the panels in a screen deck along any of the ribs 42 without eventually encountering a groove 36 and thus some of the apertures 22.
  • each aperture 22 is defined by the oppositely sloping walls 30 of adjacent ribs 24 and has a length determined by the spacing of the facing side surfaces 44 of adjacent cross ribs 26. As shown in Fig. 4, the side surfaces 44 of each cross rib may taper towards each other similarly to the side walls 30 of ribs 24. Thus the cross- sectional area of each aperture increases from the upper screening surface 20 over the whole depth of each rib 24 to minimise clogging of the apertures by the material being screened. It is to be understood that according to the invention apertures having a shape other than that which is illustrated may be provided.
  • a die set for moulding a panel 10 as shown in Figs. 6 and 7 comprises two dies 50, 52, a first one of which, 50, includes upstanding lugs 54 that have the same shape as an aperture 22. These lugs are arranged in rows and columns wherein the spacing between adjacent rows defines the series of equally spaced parallel ribs 24 and the spacing between adjacent columns of the lugs defines the plurality of cross ribs 26, with appropriate spacing being provided to define the strengthening ribs 40 and 42.
  • the second die 52 includes a flat surface 56 which defines the upper screening surface of a panel and from which rows and columns of parallel sided lugs 58 upstand with each lug 58 corresponding in shape to the volume defined by opposed parallel wall portions 38 and the upper surface portion 34 of a cross rib 26.
  • any flashing that may occur and which could restrict or block the aperture openings 22 will occur at the screening surface 20 of a panel 10 and not below that surface at the level of the surfaces 34 of cross ribs 26 as in the prior art. Flashing which is located at surface 20 is easily removed by grinding, polishing or otherwise appropriately treating that surface.
  • the invention provides an improved panel structure, and associated dies and a method of manufacture over the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

Ce panneau de criblage moulé est conçu de manière à situer sur la face supérieure de criblage toute bavure formée lors du moulage, ce qui rend celles-ci aisément accessibles et facilite leur enlèvement. Le panneau est constitué de séries de nervures parallèles également espacées (24) et de nervures transversales (26) définissant des ouvertures de criblage (22). Les faces supérieures (28) des nervures parallèles(24) définissent la surface de criblage (20). Les faces supérieures (34) des nervures transversales (26) se trouvent sous la surface de criblage (20) de sorte que des gorges (36) se trouvent formées et s'étendent sur toute la surface de criblage (20). Les matrices permettant de former le moule se rejoignent à la surface de l'une d'elles, ce qui permet de constituer la surface de criblage (20) et ce, de manière que toute bavure se forme sur cette surface.
PCT/AU1998/000483 1997-06-25 1998-06-24 Panneau de criblage moule, appareil et procede de fabrication WO1999000198A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU78991/98A AU725618B2 (en) 1997-06-25 1998-06-24 A die set for manufacturing a moulded screen panel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO7515 1997-06-25
AUPO7515A AUPO751597A0 (en) 1997-06-25 1997-06-25 Moulded screen panel and apparatus and method of manufacture

Publications (1)

Publication Number Publication Date
WO1999000198A1 true WO1999000198A1 (fr) 1999-01-07

Family

ID=3801806

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1998/000483 WO1999000198A1 (fr) 1997-06-25 1998-06-24 Panneau de criblage moule, appareil et procede de fabrication

Country Status (2)

Country Link
AU (1) AUPO751597A0 (fr)
WO (1) WO1999000198A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003076042A1 (fr) * 2002-03-08 2003-09-18 Weatherford/Lamb, Inc. Panneau-ecran et son procede de fabrication
US7303078B2 (en) 2003-05-30 2007-12-04 Weatherford/Lamb, Inc. Screen panel
US20210086232A1 (en) * 2019-09-19 2021-03-25 Derrick Corporation Tension screened assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819809A (en) * 1985-09-09 1989-04-11 Derrick Manufacturing Corporation Reinforced polyurethane vibratory screen
US4857176A (en) * 1986-08-04 1989-08-15 Derrick Manufacturing Corporation Reinforced molded polyurethane vibratory screen
AU2722895A (en) * 1994-07-28 1996-02-08 Weatherford Australia Pty Limited Screen construction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819809A (en) * 1985-09-09 1989-04-11 Derrick Manufacturing Corporation Reinforced polyurethane vibratory screen
US4857176A (en) * 1986-08-04 1989-08-15 Derrick Manufacturing Corporation Reinforced molded polyurethane vibratory screen
AU2722895A (en) * 1994-07-28 1996-02-08 Weatherford Australia Pty Limited Screen construction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003076042A1 (fr) * 2002-03-08 2003-09-18 Weatherford/Lamb, Inc. Panneau-ecran et son procede de fabrication
US7303078B2 (en) 2003-05-30 2007-12-04 Weatherford/Lamb, Inc. Screen panel
US7516850B2 (en) 2003-05-30 2009-04-14 Weatherford/Lamb, Inc. Screen panel
US20210086232A1 (en) * 2019-09-19 2021-03-25 Derrick Corporation Tension screened assembly
US11583897B2 (en) * 2019-09-19 2023-02-21 Derrick Corporation Tension screened assembly

Also Published As

Publication number Publication date
AUPO751597A0 (en) 1997-07-17

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