WO2003047771A1 - Fastening means for screens - Google Patents

Fastening means for screens Download PDF

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Publication number
WO2003047771A1
WO2003047771A1 PCT/ZA2002/000201 ZA0200201W WO03047771A1 WO 2003047771 A1 WO2003047771 A1 WO 2003047771A1 ZA 0200201 W ZA0200201 W ZA 0200201W WO 03047771 A1 WO03047771 A1 WO 03047771A1
Authority
WO
WIPO (PCT)
Prior art keywords
stringer
saddle
fastening means
panels
screening panel
Prior art date
Application number
PCT/ZA2002/000201
Other languages
French (fr)
Inventor
David Llewellyn Owen
Original Assignee
David Llewellyn Owen
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 David Llewellyn Owen filed Critical David Llewellyn Owen
Priority to AU2002359904A priority Critical patent/AU2002359904A1/en
Publication of WO2003047771A1 publication Critical patent/WO2003047771A1/en

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

Definitions

  • This invention lies in the field of screening particulate material and relates to screens for this purpose.
  • Screens that are used extensively in grading of ores and other materials in mining and process operations.
  • screens made up of a plurality of screening panels assembled in tiling fashion on the screening frame, have attained wide application.
  • Such screening panels are typically manufactured by casting a suitable grade of polyurethane and there are many designs for securing the panels mounted contiguously in a tiling fashion on a screening frame.
  • the screening frame carries the screen and must satisfy arduous demands arising from such factors as the vibratory operation, the substantial loading from the material being screened, the clogging and the abrasive properties typical of materials encountered in screening practice.
  • South African patent 95/00711 granted to Screenex Wire Weaving Manufacturers (Pty) Ltd describes a frame component which is in the form of an elongate bar having a much narrower width than its depth and at spaced apart intervals a plurality of sockets mounted in recesses or notches taken out of the top edge of the bar, the sockets being wider than the width of the bar.
  • the polyurethane panels have depending pegs, which fit into the sockets, to mount the panels. Typically pairs of pegs will fit together in each socket, to mount contiguous panels in each socket.
  • European patent application 86 902292.1 in the name of Institut Po Technitscheska Kibemetika I Robotika published under number 0 243 500 discloses a similar narrow and deep stringer with panel supports straddling the bar, each panel support presenting two brackets, one on each side of the stringer. There is a hole in each bracket for anchoring a fixing collar and pin, which passes through a screening panel from its top surface, into the bracket hole, to mount one panel.
  • each bolted pin requires the assembly of a toggle, washer and nut and must be protected from abrasion by a cover fitted after securing the panels.
  • the present invention provides a screening panel fastening means for a narrow and deep stringer of a screen support frame, which fastening means includes a saddle which has a slot that fits over the top edge of the stringer with skirts depending on either side of the stringer and the saddle pinned to the stringer by a transverse pin passing through the stringer and skirts of the saddle, the upper part of the saddle adapted for holding the panel(s) onto the stringer.
  • the stringer is not notched but only drilled for the transverse pin, giving a manufacturing simplicity and cost reduction as well as avoidance of weakening notches in the top edge of the stringer.
  • the upper part of the saddle is preferably adapted for holding the panels by means of formations, which engage with co-acting shapes in the panel(s), preferably on the panel edges so that each formation holds two contiguous panels.
  • the upper part of the saddle does not penetrate through to the upper surface of the panel(s), so that the panel protects the saddle from the abrasive action common in the materials being screened.
  • the formations may comprise a neck part and above it a head, which fit into co-acting indentations in the edges of contiguous panels.
  • the saddle may comprise a polymeric material with an embedded metal reinforcement.
  • the embedment of the reinforcement offers the advantage of protection of the metal from abrasion that is so prevalent in may screening applications.
  • the metal is preferably fully embedded, it may have limited parts protruding and the term "embedded" used herein is intended to
  • the reinforcement 4 include in its meaning partial embedment.
  • the reinforcement may have a saddle-like shape, for example.
  • figure 1 is an isometric view of a screening panel fastening means, mounted on a stringer,
  • figure 2 is an isometric "exploded" view of a stringer, fastening means and one panel
  • figure 3 is an isometric view of the fastening means assembled to hold two panels, one shown in broken lines to ease illustration,
  • figure 4 is a cross sectional elevation of a reinforced saddle
  • figure 5 is plan view on the reinforced stringer.
  • a narrow and deep stringer or beam is a component of the screen frame, which supports the polyurethane panels of the screen.
  • the depth of the stringer confers good strength to resist the downwards (and upwards) bending forces which are generated as a result of the shaking action of the screen.
  • the narrowness minimises the "dead" or obscured area of the screen where screening apertures must be omitted and/or blinding of the screening apertures tends to be caused.
  • the fastening means includes a saddle 2 which is slotted by a slot 4 to fit over the top edge 3 of the stringer and has skirts 5 and 6 depending on either side of the slot.
  • the upper part 7 of the saddle has formations for holding panels to the stringer, being a neck 7 and a head 9.
  • the saddle is fixed to the stringer by a pin 10 which passes transversely through holes 11 and 12 in the skirts and a hole 13 in the stringer.
  • the panel 14 has co-acting indented shapes 15 in the panel edges 16, being the female or hollow shapes which exactly fit the saddle on one side of the stringer.
  • the broken lines 17 in figure 3 indicate the second panel which is also held by the one saddle shown, being fitted in the position shown by these broken lines.
  • the saddle has a shoulder 18 immediately below the neck, which provides a support surface for the panels, in addition to the top surface of the stringer providing support.
  • the saddle may be made of steel or polyurethane or another higher strength polymer, like a suitable grade of polyamide, for example.
  • the saddle may be made of a polymeric material with suitable reinforcement, for example, an embedded reinforcement of steel, fibre or strand reinforcement.
  • the pin may be made of a suitable grade of polyamide, like Nylon 6, for example, or steel.
  • FIGs 4 and 5 show a reinforced screening panel fastening means 20 for a narrow and deep stringer 21 of a screen support frame.
  • the fastening means includes a saddle 22 which has a slot 23 that fits over the top edge 24 of the stringer, with skirts 25 and 26 depending on either side of the stringer and the saddle pinned to the stringer by a transverse pin 27 passing through the stringer and skirts of the saddle.
  • the upper part of the saddle is adapted for holding two panels onto the stringer by means of a head 28, below it a neck 29 and below that a shoulder 30 that engage the edges of the panels in a manner shown already in figures 2 and 3, for example.
  • a metal reinforcement 31 is embedded in the fastening.
  • the metal reinforcement is in the form of an inverted U-shaped strap thus conferring a reinforcement that co-operates with the saddle form of the fastening.
  • the pin passes through both the saddle and the metal reinforcing.
  • the fastening can be moulded in a suitable (fairly hard) formulation of polyurethane and the strap can be a suitable grade of steel.
  • the fastening is thus inexpensive but effective.
  • the dimensioning of the head, neck and shoulder must be such that they will retain a panel against upward and downward forces of at least 10 times to 20 times the mass of the panel downwards and 20 times to 30 times upwards.

Abstract

Polyurethane panel type screens are supported on steel stringers (1) that have a narrow and deep cross sectional shape, with saddles (2) fitted onto the top edges (3) of the stringers. The saddles (2) are moulded in polyurethane (optionally with embedded steel reinforcement) to a shape that has a slot (4) for the stringer (1) with skirts (5, 6) depending on either side, with head, neck and shoulder formations for holding two contiguous panels. The formations engage matching recesses in the sides of the panels. The saddles (2) are pinned to the stringer by pins (10) that pass through the saddle skirts (and metal reinforcing of present) and the stringer.

Description

FASTENING MEANS FOR SCREENS
FIELD OF THE INVENTION
This invention lies in the field of screening particulate material and relates to screens for this purpose. Important but non-limiting examples are screens that are used extensively in grading of ores and other materials in mining and process operations. Apart from woven wire screens and perforated sheet and plate screens, screens made up of a plurality of screening panels assembled in tiling fashion on the screening frame, have attained wide application. Such screening panels are typically manufactured by casting a suitable grade of polyurethane and there are many designs for securing the panels mounted contiguously in a tiling fashion on a screening frame.
BACKGROUND
The screening frame carries the screen and must satisfy arduous demands arising from such factors as the vibratory operation, the substantial loading from the material being screened, the clogging and the abrasive properties typical of materials encountered in screening practice.
South African patent 95/00711 granted to Screenex Wire Weaving Manufacturers (Pty) Ltd describes a frame component which is in the form of an elongate bar having a much narrower width than its depth and at spaced apart intervals a plurality of sockets mounted in recesses or notches taken out of the top edge of the bar, the sockets being wider than the width of the bar. The polyurethane panels have depending pegs, which fit into the sockets, to mount the panels. Typically pairs of pegs will fit together in each socket, to mount contiguous panels in each socket.
European patent application 86 902292.1 in the name of Institut Po Technitscheska Kibemetika I Robotika published under number 0 243 500 discloses a similar narrow and deep stringer with panel supports straddling the bar, each panel support presenting two brackets, one on each side of the stringer. There is a hole in each bracket for anchoring a fixing collar and pin, which passes through a screening panel from its top surface, into the bracket hole, to mount one panel.
PCT patent application in the name of the present inventor published under WO 00/73669 A1 describes a similar narrow and deep notched bar or "stringer" carrying discs welded at the top edge of the bar at each notch; a bolted pin passes through a hole in each disc and secures a holding component which holds down two polyurethane panels. Typically each holding component engages the edges of contiguous panels, to mount them.
While these designs all have the important advantages of the narrow stringer, which minimises the obscuring or clogging of screening area, they achieve this at the cost of other disadvantages.
The South African patent and the PCT application have the advantage of each single holding component holding two contiguous panels but at the cost of the notches in the stringers, which incur manufacturing costs and reduce the strength and fatigue endurance of the stringer under the reciprocating bending loads, which prevail. In the case of the design described in the PCT application moreover, each bolted pin requires the assembly of a toggle, washer and nut and must be protected from abrasion by a cover fitted after securing the panels.
The European application avoids the notches in the stringer but the two brackets presented by each panel support requires twice the number of fixing means and obscure a part of the panel on each side of the stringer. THE INVENTION
The present invention provides a screening panel fastening means for a narrow and deep stringer of a screen support frame, which fastening means includes a saddle which has a slot that fits over the top edge of the stringer with skirts depending on either side of the stringer and the saddle pinned to the stringer by a transverse pin passing through the stringer and skirts of the saddle, the upper part of the saddle adapted for holding the panel(s) onto the stringer.
The stringer is not notched but only drilled for the transverse pin, giving a manufacturing simplicity and cost reduction as well as avoidance of weakening notches in the top edge of the stringer.
The upper part of the saddle is preferably adapted for holding the panels by means of formations, which engage with co-acting shapes in the panel(s), preferably on the panel edges so that each formation holds two contiguous panels.
Preferably the upper part of the saddle does not penetrate through to the upper surface of the panel(s), so that the panel protects the saddle from the abrasive action common in the materials being screened.
The formations may comprise a neck part and above it a head, which fit into co-acting indentations in the edges of contiguous panels.
The saddle may comprise a polymeric material with an embedded metal reinforcement. The embedment of the reinforcement offers the advantage of protection of the metal from abrasion that is so prevalent in may screening applications. Although the metal is preferably fully embedded, it may have limited parts protruding and the term "embedded" used herein is intended to
4 include in its meaning partial embedment. The reinforcement may have a saddle-like shape, for example.
THE DRAWINGS
The invention will be more fully described by way of a non-limiting example with reference to the drawings, in which : -
figure 1 is an isometric view of a screening panel fastening means, mounted on a stringer,
figure 2 is an isometric "exploded" view of a stringer, fastening means and one panel,
figure 3 is an isometric view of the fastening means assembled to hold two panels, one shown in broken lines to ease illustration,
figure 4 is a cross sectional elevation of a reinforced saddle, and
figure 5 is plan view on the reinforced stringer.
THE PREFERRED EMBODIMENTS
As shown in figures 1 to 3 of the drawings, a narrow and deep stringer or beam is a component of the screen frame, which supports the polyurethane panels of the screen. The depth of the stringer of course confers good strength to resist the downwards (and upwards) bending forces which are generated as a result of the shaking action of the screen. The narrowness minimises the "dead" or obscured area of the screen where screening apertures must be omitted and/or blinding of the screening apertures tends to be caused. The fastening means includes a saddle 2 which is slotted by a slot 4 to fit over the top edge 3 of the stringer and has skirts 5 and 6 depending on either side of the slot. The upper part 7 of the saddle has formations for holding panels to the stringer, being a neck 7 and a head 9. The saddle is fixed to the stringer by a pin 10 which passes transversely through holes 11 and 12 in the skirts and a hole 13 in the stringer.
The panel 14 has co-acting indented shapes 15 in the panel edges 16, being the female or hollow shapes which exactly fit the saddle on one side of the stringer. The broken lines 17 in figure 3 indicate the second panel which is also held by the one saddle shown, being fitted in the position shown by these broken lines.
The saddle has a shoulder 18 immediately below the neck, which provides a support surface for the panels, in addition to the top surface of the stringer providing support.
The saddle may be made of steel or polyurethane or another higher strength polymer, like a suitable grade of polyamide, for example.
The saddle may be made of a polymeric material with suitable reinforcement, for example, an embedded reinforcement of steel, fibre or strand reinforcement.
The pin may be made of a suitable grade of polyamide, like Nylon 6, for example, or steel.
Figures 4 and 5, show a reinforced screening panel fastening means 20 for a narrow and deep stringer 21 of a screen support frame. The fastening means includes a saddle 22 which has a slot 23 that fits over the top edge 24 of the stringer, with skirts 25 and 26 depending on either side of the stringer and the saddle pinned to the stringer by a transverse pin 27 passing through the stringer and skirts of the saddle. The upper part of the saddle is adapted for holding two panels onto the stringer by means of a head 28, below it a neck 29 and below that a shoulder 30 that engage the edges of the panels in a manner shown already in figures 2 and 3, for example. A metal reinforcement 31 is embedded in the fastening. The metal reinforcement is in the form of an inverted U-shaped strap thus conferring a reinforcement that co-operates with the saddle form of the fastening. The pin passes through both the saddle and the metal reinforcing.
The fastening can be moulded in a suitable (fairly hard) formulation of polyurethane and the strap can be a suitable grade of steel. The fastening is thus inexpensive but effective. The dimensioning of the head, neck and shoulder must be such that they will retain a panel against upward and downward forces of at least 10 times to 20 times the mass of the panel downwards and 20 times to 30 times upwards. These figures must be modified according to reciprocating accelerations in a given application.
REFERENCE NUMERALS LIST
1 stringer
2 fastening means
3 top surface of stringer
4 slot in fastening means
5 skirt of fastening means
6 skirt of fastening means
7 upper part of fastening means
8 neck of fastening means
9 head of fastening means
10 transverse pin
11 hole for pin in skirt
12 hole for pin in skirt
13 hole in stringer for pin
14 screening panel
15 indentations in panel edge
16 panel edges
17 broken lines showing second panel
18 shoulder of saddle
19 -
20 fastening means
21 stringer
22 saddle
23 slot
24 top of stringer
25 skirt
26 skirt
27 pin
28 head
29 neck
30 shoulder

Claims

CLAIMS:
1. A screening panel fastening means for a narrow and deep stringer of a screen support frame, which fastening means includes a saddle which has a slot that fits over the top edge of the stringer with skirts depending on either side of the stringer and the saddle pinned by a pin to the stringer by a transverse pin passing through the stringer and skirts of the saddle, the upper part of the saddle adapted for holding the panel(s) onto the stringer.
2. A screening panel fastening means as claimed in claim 1 , in which the upper part of the saddle is adapted for holding the panels by means of formations, which engage with co-acting shapes in the panels edges so that each formation holds two contiguous panels.
3. A screening panel fastening means as claimed in claim 2, in which the formations comprise a head, below that a neck and below that a shoulder.
4. A screening panel fastening means as claimed in any one of claims 1 to 3, in which the upper part of the saddle does not penetrate through to the upper surface of the panel(s), so that the panel protects the saddle from the abrasive action common in the materials being screened.
5. A screening panel fastening means as claimed in any one of claims 1 to 4, in which the saddle comprises a polymeric material with an embedded metal reinforcement.
6. A screening panel fastening means as claimed in claim 5, in which the reinforcement is in the form of a saddle-shaped strap.
7. A screening panel fastening means as claimed in any one of claims 1 to 6 and a stringer that is not notched but only drilled for the transverse pin.
8. A screening panel fastening means as herein described and as illustrated in figures 1 to 3 of the drawings.
9. A screening panel fastening means as herein described and as illustrated in figures 4 and 5 of the drawings.
10
PCT/ZA2002/000201 2001-12-07 2002-12-09 Fastening means for screens WO2003047771A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002359904A AU2002359904A1 (en) 2001-12-07 2002-12-09 Fastening means for screens

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2001/7407 2001-12-07
ZA200107407 2001-12-07

Publications (1)

Publication Number Publication Date
WO2003047771A1 true WO2003047771A1 (en) 2003-06-12

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ID=25589306

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2002/000201 WO2003047771A1 (en) 2001-12-07 2002-12-09 Fastening means for screens

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AU (1) AU2002359904A1 (en)
WO (1) WO2003047771A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6957741B2 (en) 2001-08-07 2005-10-25 Manfred Franz Axel Freissle Screening arrangement
WO2006034526A1 (en) * 2004-09-27 2006-04-06 Weatherford Australia Pty Limited A screening module retaining member
AU2005289353B2 (en) * 2004-09-27 2010-01-28 Flsmidth A/S A screening module retaining member
US8123043B2 (en) 2006-11-28 2012-02-28 Ludowici Australia Pty Ltd. Screening module retaining assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243500A1 (en) * 1985-03-21 1987-11-04 Institut Po Technitscheska Kibernetika I Robotika Joint for assembling of sieve elements
GB2252127A (en) * 1991-01-22 1992-07-29 Mercol Descaling Co Ltd Retention peg arrangement for a screen mat assembly
WO2000064599A2 (en) * 1999-04-26 2000-11-02 Durex Products, Inc. Sieve bed for a sifting machine
WO2000073669A1 (en) * 1999-05-31 2000-12-07 David Llewellen Owen Screens
WO2001058602A1 (en) * 2000-02-14 2001-08-16 Western Wire Works, Inc. Screening system for screening or diverting particulate material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243500A1 (en) * 1985-03-21 1987-11-04 Institut Po Technitscheska Kibernetika I Robotika Joint for assembling of sieve elements
GB2252127A (en) * 1991-01-22 1992-07-29 Mercol Descaling Co Ltd Retention peg arrangement for a screen mat assembly
WO2000064599A2 (en) * 1999-04-26 2000-11-02 Durex Products, Inc. Sieve bed for a sifting machine
WO2000073669A1 (en) * 1999-05-31 2000-12-07 David Llewellen Owen Screens
WO2001058602A1 (en) * 2000-02-14 2001-08-16 Western Wire Works, Inc. Screening system for screening or diverting particulate material

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6957741B2 (en) 2001-08-07 2005-10-25 Manfred Franz Axel Freissle Screening arrangement
US7240801B2 (en) 2001-08-07 2007-07-10 Manfred Franz Axel Freissle Screening arrangement
US7604127B2 (en) 2001-08-07 2009-10-20 Manfred Franz Axel Freissle Screening arrangement
US7621406B2 (en) 2001-08-07 2009-11-24 Polydeck Screen Corporation Conversion kit for particulate screening system and related implementation methods
US8025153B2 (en) 2001-08-07 2011-09-27 Manfred Franz Axel Freissle Screening arrangement
WO2006034526A1 (en) * 2004-09-27 2006-04-06 Weatherford Australia Pty Limited A screening module retaining member
AU2005289353B2 (en) * 2004-09-27 2010-01-28 Flsmidth A/S A screening module retaining member
US8123043B2 (en) 2006-11-28 2012-02-28 Ludowici Australia Pty Ltd. Screening module retaining assembly

Also Published As

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