CA2524540C - Laminated screen plate - Google Patents
Laminated screen plate Download PDFInfo
- Publication number
- CA2524540C CA2524540C CA002524540A CA2524540A CA2524540C CA 2524540 C CA2524540 C CA 2524540C CA 002524540 A CA002524540 A CA 002524540A CA 2524540 A CA2524540 A CA 2524540A CA 2524540 C CA2524540 C CA 2524540C
- Authority
- CA
- Canada
- Prior art keywords
- plate
- openings
- carrier plate
- screen plate
- screen
- Prior art date
- Legal status (The legal status 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 status listed.)
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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
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
-
- 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
- B07B1/18—Drum 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
- B07B1/469—Perforated sheet-like material
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Printing Plates And Materials Therefor (AREA)
- Laminated Bodies (AREA)
Abstract
A screen plate of multilayer construction including a structural member containing a plurality of openings and provided with a protective layer of highly wear resistant material with openings corresponding with those in the structural member. The structural member preferably could be referred to as a carrier plate and preferably the screen plate is a laminated screen plate.
Description
TITLE
LAMINATED SCREEN PLATE
This invention relates to screen plates, particularly in the mining and associated industries.
S BACKC,ROUND
In the mining and associated industries screen plates are used to separate smaller grades of the material passing over the n plate or breaker screens, which may either be a flat vibratory piste or an arcuate plate do form portion of a rotating cylindrical drum.
Conventionally screen plates comprise a metal plate having a plurality of holes there through of the required size, which may be in one example of the order of 50mm square to permit material of smaller size to pass there through from larger rocks and boulders passing over the screen plate. In one example breaker screens form the screening surface of a large rotating drum of a diameter of some 5 1 S meters with a screening length about 17 meters, the drum having a throughput of about 2 million tonnes per month.
The screen plates are typically metal plates 50mm thick with 50mrn square holes forming the perforated plate. Each plate is typically about 1.8 meters square weighing over 1 tonne. The wearing surtace of the perforated plate has a hard facing of plasma transfer arc welded tungsten carbide to a depth of 2-3 mm. In use the impact of large rocks of up to 300mm diameter causes spalling of the hard and brittle tungsten carbide thereby adversely affecting service life.
Hence it is an object of the invention to overcome one or more of the deficiencies of the prior wear resistant screen plates.
Z 5 A further object of the invention is to provide a material separation member having abrasion resistant qualities.
A further object of the invention is to provide a material separation member possessing a wear resistant surface provided with perforations.
Z
A further object is to provide a mineral separation member constructed in such a way that the surface between the holes is covered by an assembly of wear plates that protirds ail surfaces in contact with the material passing through.
BRIEF STATEMENT OF THE INVENTION
S Thus there is provided aooonding to the invention a scxeen plate of multllayer construction comprising a structural member, referred to henceforth as a carrier plate, containing a plurality of openings and provided with a protective layer of highly wear resistant material with openings corresponding with those in the carrier plate.
Preferably the carrier plate is a metal steel date.
Preferably the abrasion resistant material is in the form of a plurality of a bi~metallic composite parts, each consisting of an alloy white iron brazed to a mild steel backing plebe, and in tum welded to the underlying carrier plate.
Preferably the abrasion resistant protective layer consists of a multiplicity of relatively small plates shaped and arranged on the carrier plate in such a way that they form a mosaic with the openings in it that match those in the carrier plate.
Preferably the abrasion resistant plates overlap the edges of the holes.
Preferably the abrasive resistant plates are abrasive resistant white iron brazed to a mild steel base.
Preferably the abrasive resistant plates are welded to the carrier plate around the ZO holes to the under surface of the abrasive resistant members.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a developed plan view of a curved carrier plate showing the holes in the plate, Figure 2 is a anss sectional view of the carrier plate of Figure 1,
LAMINATED SCREEN PLATE
This invention relates to screen plates, particularly in the mining and associated industries.
S BACKC,ROUND
In the mining and associated industries screen plates are used to separate smaller grades of the material passing over the n plate or breaker screens, which may either be a flat vibratory piste or an arcuate plate do form portion of a rotating cylindrical drum.
Conventionally screen plates comprise a metal plate having a plurality of holes there through of the required size, which may be in one example of the order of 50mm square to permit material of smaller size to pass there through from larger rocks and boulders passing over the screen plate. In one example breaker screens form the screening surface of a large rotating drum of a diameter of some 5 1 S meters with a screening length about 17 meters, the drum having a throughput of about 2 million tonnes per month.
The screen plates are typically metal plates 50mm thick with 50mrn square holes forming the perforated plate. Each plate is typically about 1.8 meters square weighing over 1 tonne. The wearing surtace of the perforated plate has a hard facing of plasma transfer arc welded tungsten carbide to a depth of 2-3 mm. In use the impact of large rocks of up to 300mm diameter causes spalling of the hard and brittle tungsten carbide thereby adversely affecting service life.
Hence it is an object of the invention to overcome one or more of the deficiencies of the prior wear resistant screen plates.
Z 5 A further object of the invention is to provide a material separation member having abrasion resistant qualities.
A further object of the invention is to provide a material separation member possessing a wear resistant surface provided with perforations.
Z
A further object is to provide a mineral separation member constructed in such a way that the surface between the holes is covered by an assembly of wear plates that protirds ail surfaces in contact with the material passing through.
BRIEF STATEMENT OF THE INVENTION
S Thus there is provided aooonding to the invention a scxeen plate of multllayer construction comprising a structural member, referred to henceforth as a carrier plate, containing a plurality of openings and provided with a protective layer of highly wear resistant material with openings corresponding with those in the carrier plate.
Preferably the carrier plate is a metal steel date.
Preferably the abrasion resistant material is in the form of a plurality of a bi~metallic composite parts, each consisting of an alloy white iron brazed to a mild steel backing plebe, and in tum welded to the underlying carrier plate.
Preferably the abrasion resistant protective layer consists of a multiplicity of relatively small plates shaped and arranged on the carrier plate in such a way that they form a mosaic with the openings in it that match those in the carrier plate.
Preferably the abrasion resistant plates overlap the edges of the holes.
Preferably the abrasive resistant plates are abrasive resistant white iron brazed to a mild steel base.
Preferably the abrasive resistant plates are welded to the carrier plate around the ZO holes to the under surface of the abrasive resistant members.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a developed plan view of a curved carrier plate showing the holes in the plate, Figure 2 is a anss sectional view of the carrier plate of Figure 1,
2 S Figure 3 is a cross section of portion of the screen plate with abrasion resistant plates welded thereon,
3 Figure 4 is a plan view of portion of the screen plate with the abrasion resistant plates in position, Figure 5a, b, c. d. e. f. g. h. i show various shaped abrasion resistant plates, Figure 6 shows a preferred screen plate with square holes surrounded by abrasion n3sistant plates, Fgure 7 is a cross-sectional view of the screen plate, Figure 8 shows an example of one of the abrasion resistant plates, and Figure 9 shows an example of a larger abrasion resistant plafie grooved to facilitate deliberate breaking into one or more smaller abrasion resistant plates, DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring t4 Figures I to 5 of the drawings the screen plate 1 comprises a carrier plate 2 having a plurality of screening holes 3 there through. In the example the screen plate is one of a plurality of curved screen plates to form a drum through which the material to be screened passes. Figure 1 shows a developed plan of a 1 S carrier plate while Figure 2 shows a typical Gross section of a curved carrier plate.
The carrier plate 2 has a plurality of bolt holes 4 whereby the screen plate can be bolted to the structure supporting the Screen plate, in this case to the drum sb~u~ure. 'me area extending diagonally across the babe with no screening holes is due tv the substructure in the screen drum. Depending on the structure of the screen drum screening holes may cover the whole surface and also if the screen plate is used as a flat sa een in other installations the holes may be across the whole plate, or have areas with no holes depending upon the supporting shvcd~re.
To protect the surtaoe of the carrier plate abrasion resistant plates (ARP) 5 are 2 5 welded between the holes as shown in Flgure 4. As shown in the Figures each of the ARP are so shaped and dimensioned to overlap the edges of the holes in the carrier plate, the holes teeing shown by dotted lines. The ARP 5 protect the edges of the holes of the carrier plate.
Referring t4 Figures I to 5 of the drawings the screen plate 1 comprises a carrier plate 2 having a plurality of screening holes 3 there through. In the example the screen plate is one of a plurality of curved screen plates to form a drum through which the material to be screened passes. Figure 1 shows a developed plan of a 1 S carrier plate while Figure 2 shows a typical Gross section of a curved carrier plate.
The carrier plate 2 has a plurality of bolt holes 4 whereby the screen plate can be bolted to the structure supporting the Screen plate, in this case to the drum sb~u~ure. 'me area extending diagonally across the babe with no screening holes is due tv the substructure in the screen drum. Depending on the structure of the screen drum screening holes may cover the whole surface and also if the screen plate is used as a flat sa een in other installations the holes may be across the whole plate, or have areas with no holes depending upon the supporting shvcd~re.
To protect the surtaoe of the carrier plate abrasion resistant plates (ARP) 5 are 2 5 welded between the holes as shown in Flgure 4. As shown in the Figures each of the ARP are so shaped and dimensioned to overlap the edges of the holes in the carrier plate, the holes teeing shown by dotted lines. The ARP 5 protect the edges of the holes of the carrier plate.
4 Each of the ARP 5 comprise a highly abrasive resistant material 6 such as white iron brazed to a backing plate 7 of mild steel, examples of this material are sold under the registered trade marks DOMITE and L~4MINITE. These are welded to the carrier plate by welding from underneath into the overlapping portion by a S bead of weld 8 extending around the edge of the hole 3, as shown is Figure 3, and the under surtace of the backing plate 7. Preferably the edge of the hole 3 is chamfered or bevelled to provide a greater area for welding.
In the example shown the ARP may be produced in various shapes to cover the spaces between the holes. The majority of these would be the shape A, however around the edges the shapes can vary as illustrated in Figures 4 and
In the example shown the ARP may be produced in various shapes to cover the spaces between the holes. The majority of these would be the shape A, however around the edges the shapes can vary as illustrated in Figures 4 and
5.
Also it is noted some of the shapes such as C, D and E are produced in right and left hand v~rsions.
With the oonstructlon of this invention, if any of the ARP become unserviceable for any reason, the ARP can be removed by grinding out the weld, and welding in a 1 S new ARP. This results in less downtime than in the prior systems where the entire plate weighing over one tonne has to be removed and replaced.
A preferred version of the invention is shown in Fgures 6, 7 and 8. The carrier plate 10 has spaced square holes 11 flame cut therein. in this embodiment the ARP are rectangular and are sized to overlap the adjacent holes 11 to protect the edges of the holes as in the previous embodiment. The edges of the holes are bevelled or chamfered to receive the welding bead welding the ARP to the Carrier plate 10.
Referring now to Figure 9, there is shown a larger ARP In the form of four ARP
of A
shape separated by grooves 12. In this way one or more ARP can be separated 2 S from the others by deliberate fracturing along the groove or grooves 12.
Although the A shape is illustrated it is realised the concept can be applied to other shapes, particularly the shape shown in Figures 6, 7 and 8.
The larger grooved ARP thus covers a greater area resulting in reduced welding.
There are a reduced number of gaps between each ARP thereby decreasing the exposure of preferential wear in the gap of each opening. Less items per assembly are required and the cast in grooves provide the ability to mould into the curvature of the carrier plate.
While two embodiments of the Invention are described It is to be realised that the invention is not limited to these embodiments for the invention can be applied to quite a range of different applications where abrasive resistant screens are required. Thus the hole sizes and shapes can vary, also th thickness of the carrier 5 or base plate can vary depending upon the particular desired application of use of the screen plate. Also as described the invention can be applied ~ flat or a,rrved surfaces.
The ARP are welded to the base or carrier plate by welding the overlapping portion to the bevelled edges of the holes in the base plate. Thus the size of the screen plate is determined by the spacing of the ARP, the size of the holes in the base plate being determined by the degree of overlap of the ARP over the holes:
Thus each ARP is individually welds to the base or carrier plate and thus if one or more of the ARP are very severely damaged, they can be removed by grinding out the weld and replaced. This then requires less down time compared with the existing equipment where the whole panel has to be removed and replaced.
The ARP has definite advantages over the tungsten carbide plasma coating due to the greater thickness of the white iron alloy a feature which ensures that the sidewalls of the screen openings are of the same wear resistant material as the surface, thus presenting a more durable edge to the screen openings than the thin layer of hard facing material which is known to spall away and expose the mild steel sub-strafe. During use the tungsten carbide plasma coating becomes damaged particularly around the edge of the sd'een hole thus exposing the mild steel carrier plate which is thus exposed to abrasive attack. Also the ARP extend over the edge of the hole in the carrier plate and thus the mild steel carrier plate Is protected from abrasive attack.
Although various embodiment of the invention have been described, the invention is not to be limited thereto but can include variations and modifications falling within the spirit and scope of the invention.
Also it is noted some of the shapes such as C, D and E are produced in right and left hand v~rsions.
With the oonstructlon of this invention, if any of the ARP become unserviceable for any reason, the ARP can be removed by grinding out the weld, and welding in a 1 S new ARP. This results in less downtime than in the prior systems where the entire plate weighing over one tonne has to be removed and replaced.
A preferred version of the invention is shown in Fgures 6, 7 and 8. The carrier plate 10 has spaced square holes 11 flame cut therein. in this embodiment the ARP are rectangular and are sized to overlap the adjacent holes 11 to protect the edges of the holes as in the previous embodiment. The edges of the holes are bevelled or chamfered to receive the welding bead welding the ARP to the Carrier plate 10.
Referring now to Figure 9, there is shown a larger ARP In the form of four ARP
of A
shape separated by grooves 12. In this way one or more ARP can be separated 2 S from the others by deliberate fracturing along the groove or grooves 12.
Although the A shape is illustrated it is realised the concept can be applied to other shapes, particularly the shape shown in Figures 6, 7 and 8.
The larger grooved ARP thus covers a greater area resulting in reduced welding.
There are a reduced number of gaps between each ARP thereby decreasing the exposure of preferential wear in the gap of each opening. Less items per assembly are required and the cast in grooves provide the ability to mould into the curvature of the carrier plate.
While two embodiments of the Invention are described It is to be realised that the invention is not limited to these embodiments for the invention can be applied to quite a range of different applications where abrasive resistant screens are required. Thus the hole sizes and shapes can vary, also th thickness of the carrier 5 or base plate can vary depending upon the particular desired application of use of the screen plate. Also as described the invention can be applied ~ flat or a,rrved surfaces.
The ARP are welded to the base or carrier plate by welding the overlapping portion to the bevelled edges of the holes in the base plate. Thus the size of the screen plate is determined by the spacing of the ARP, the size of the holes in the base plate being determined by the degree of overlap of the ARP over the holes:
Thus each ARP is individually welds to the base or carrier plate and thus if one or more of the ARP are very severely damaged, they can be removed by grinding out the weld and replaced. This then requires less down time compared with the existing equipment where the whole panel has to be removed and replaced.
The ARP has definite advantages over the tungsten carbide plasma coating due to the greater thickness of the white iron alloy a feature which ensures that the sidewalls of the screen openings are of the same wear resistant material as the surface, thus presenting a more durable edge to the screen openings than the thin layer of hard facing material which is known to spall away and expose the mild steel sub-strafe. During use the tungsten carbide plasma coating becomes damaged particularly around the edge of the sd'een hole thus exposing the mild steel carrier plate which is thus exposed to abrasive attack. Also the ARP extend over the edge of the hole in the carrier plate and thus the mild steel carrier plate Is protected from abrasive attack.
Although various embodiment of the invention have been described, the invention is not to be limited thereto but can include variations and modifications falling within the spirit and scope of the invention.
Claims (4)
1. A screen plate of multilayer construction including a structural member forming a steel carrier plate containing a plurality of openings and provided with a protective layer of highly wear resistant material with openings corresponding with those in the structural member, wherein the protective layer of highly wear resistant material consists of a multiplicity of relatively small plates shaped and arranged on the carrier plate in such a way they form a mosaic with the openings in each small plate matching the openings in the carrier plate.
2. A screen plate as defined in claim 1 wherein the small plates of highly wear resistant material are each an alloy white iron brazed to a mild steel backing plate.
3. A screen plate as defined in claim 2 wherein the openings in the small plates of highly wear resistant material overlap the openings in the carrier plate.
4. A screen plate as defined in claim 3 wherein the plates of highly wear resistant material are welded to the carrier plate by welding to the overlapped portion of the openings in the mild steel backing plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2004906256 | 2004-11-01 | ||
| AU2004906256A AU2004906256A0 (en) | 2004-11-01 | Laminated screen plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2524540A1 CA2524540A1 (en) | 2006-05-01 |
| CA2524540C true CA2524540C (en) | 2008-07-29 |
Family
ID=36283144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002524540A Active CA2524540C (en) | 2004-11-01 | 2005-10-26 | Laminated screen plate |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2524540C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IES20080241A2 (en) * | 2008-03-31 | 2009-09-30 | Lagan Technology Ltd | A method of operating an asphalt plant |
| US8919567B2 (en) | 2011-10-12 | 2014-12-30 | Syncrude Canada Ltd. | Screen cloth for vibrating or stationary screens |
| US9724732B2 (en) | 2014-08-05 | 2017-08-08 | Syncrude Canada Ltd. | Screen cloth for vibrating, rotating or stationary screens |
| AU2016429662B2 (en) | 2016-11-17 | 2023-04-27 | Sandvik Intellectual Property Ab | Wear resistant screening media |
-
2005
- 2005-10-26 CA CA002524540A patent/CA2524540C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2524540A1 (en) | 2006-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |