GB2508470A - Forming a screen by feeding an elongate member around support bars - Google Patents

Forming a screen by feeding an elongate member around support bars Download PDF

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Publication number
GB2508470A
GB2508470A GB201315661A GB201315661A GB2508470A GB 2508470 A GB2508470 A GB 2508470A GB 201315661 A GB201315661 A GB 201315661A GB 201315661 A GB201315661 A GB 201315661A GB 2508470 A GB2508470 A GB 2508470A
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GB
United Kingdom
Prior art keywords
elongate member
support bars
screen
allow
supply
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.)
Granted
Application number
GB201315661A
Other versions
GB2508470B (en
GB201315661D0 (en
Inventor
John Martin Sill
Graham Poole
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OPTIMA INTERNAT Ltd
Original Assignee
OPTIMA INTERNAT 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 OPTIMA INTERNAT Ltd filed Critical OPTIMA INTERNAT Ltd
Publication of GB201315661D0 publication Critical patent/GB201315661D0/en
Publication of GB2508470A publication Critical patent/GB2508470A/en
Application granted granted Critical
Publication of GB2508470B publication Critical patent/GB2508470B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B07B1/4618—Manufacturing of screening surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F15/00—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire
    • B21F15/02—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire
    • B21F15/06—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire with additional connecting elements or material
    • B21F15/08—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire with additional connecting elements or material making use of soldering or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
    • B21F27/121—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars
    • B21F27/122—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars by attaching a continuous stirrup to longitudinal wires
    • B21F27/124—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars by attaching a continuous stirrup to longitudinal wires applied by rotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
    • B21F27/18—Making special types or portions of network by methods or means specially adapted therefor of meshed work for filters or sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/12—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gratings

Abstract

There is provided apparatus for the formation of a screen comprising support bars 4 and at least one elongate member located with and supported by said support bars to form the screen. The apparatus comprises a holder 24 to locate a plurality of the support bars at spaced intervals around a substantially circular path, a supply of the elongate member which is to be attached to the support bars, welding apparatus to allow the join of the elongate member to the support bars and feed means 32 to allow relative movement between the elongate member supply and the support bars so as to allow the progressive joining of the elongate member to the support bars to form the screen.

Description

Apparatus and method for forming screens The invention to which the subject of this application relates is an apparatus and method for the formation of a screen of a type which can be used for many different purposes such as, but not limited to, any or any combination of architectural purposes, screening purposes, filtering purposes or indeed any other use and hereinafter the apparatus is referred to in a non-limiting manner as a screen.
Screens of the type to which the invention relates typically comprise a number of spaced support bars which have located thereon and which support, one or more elongate members which are triangular in cross-section and which is commonly referred to as wedge wire. The screens which are formed can be flat, curved or cylindrical to suit the specific purpose to which they are to be put. Thus, typically the dimensions of the support bars, the wedge wires and the spacing between the respective support bars and the spacing between the respective wedge wires can all be selected to provide the required effect for the proposed use of the screens.
Conventionally, the screens have been formed using substantially manual manufacturing methods in which the support bars are placed at a required distance apart and the wedge wires are then placed across the same and joined to the wedge wires such that the wedge wires lie substantially perpendicular to the support bars and the joining of the wedge wires to the support bars is achieved by welding the wedge wires to each of the support bars at the points of intersection to form the screen. It will be appreciated that this method of construction is a labour intensive manufacturing method and, as such, is expensive and has traditionally resulted in the screens which are formed being relatively expensive to manufacture and purchase.
An aim of the present invention is to provide a manufacturing apparatus and method which allows the manufacture of the screens to be achieved in a substantially automated manner to thereby improve the efficiency of manufacture, the reliability of the screens which are formed and reduce the labour which is required to be used to form the screens.
In a first aspect of the invention, there is provided apparatus for the formation of a screen comprising support bars and at least one elongate member located with and supported by said support bars to form the screen, said apparatus comprising a holder to locate a plurality of said support bars at spaced intervals aroLind a substantially circular path, a supply of the elongate member which is to be attached to said support bars, welding apparatus to allow the join of said elongate member to the support bars and feed means to allow relative movement between the elongate member supply and the support bars so as to allow the progressive joining of the elongate member to the support bars to form the screen.
In one embodiment the screen which is formed is cylindrical.
In one embodiment the screen, once formed can be cut to allow a screen of a desired shape to be formed.
In one embodiment, the feed means causes rotational movement of the support bars and/or the feed means causes movement of the supply of the elongate member.
Typically the welding apparatus is provided at a fixed location and includes a weld material which is located so as to contact with the elongate member and/or support bar such that when an overlap between the support bar and elongate member occurs the weld to join the same together is achieved utilising a portion of the weld material.
Tn one embodiment, the weld material is substantially formed of copper.
Typically, the elongate member is substantially triangular in cross-section and one of the corners of the triangular cross-section is located so as to contact and join with the support bars.
In one embodiment, a continuous elongate member is used to form the entire screen, with the respective movement between the supply of the elongate member and support bars allowing the elongate member to follow a helical path as it is joined to the support bars.
Typically, once the screen has been formed, the same is retained in the cylindrical shape or alternatively, the same can be cut, typically along it's length, and then flattened to form a flat screen or any other form of curved screen which may be required for the final usage of the same.
Typically, the relative movement between the support bars and the supply of the elongate member is selected so as to allow control of the spacing between the adjacent portions of the elongate member when joined to the support bars.
Typically, the si2e of the elongate member can also be selected to suit the subsequent use of the screen which is subsequently desired.
In one embodiment, the welding means includes a dressing member which locates on the welding material, which is typically provided in the form of a disk and, more typically, locates on the particular external face of the disk which contacts with the elongate member to achieve the weld. Typically, the dressing means is used at intervals to smooth the said external face and hence prevent grooves from forming on the weld material disk.
This ensures that the weld material can continue to be available in an optimal form in order to achieve the required join between the support bars and the elongate member.
In one embodiment, the dressing means is in constant contact with the weld material or alternatively, can be selectively contacted with the weld material at time intervals in order to allow the weld material to be dressed and provide a substantially uniform surface for contact with the elongate member.
In one embodiment, the elongate member is presented to be joined to the support bars sLich that the face of the elongate member which is to form an external face of the screen once formed lies substantially parallel with the support bar to which the same is joined.
In an alternative embodiment, the elongate member is presented to the support bars such that the face of the elongate member which is to form an external face of the screen, once formed, lies at an angle to the support bar such that the said face is not parallel with the support bar. This arrangement means that an edge of the face of the elongate member which forms the external face of the screen, is raised with respect to the opposing edge of said face so as to provide a cutting effect when the screen is subsequently used, for example, for screening or filtering purposes. The cutting effect may be, for example, to cut through debris which is being filtered by the screen.
S
Typically the particular angle of presentation of the elongate member is dependent upon the particular use and screening and/or filtering effect which is desired to be achieved.
Tn a further aspect of the invention there is provided a method for the formation of a screen comprising support bars and at east one &ongate member located with and supported by said support bars to form the screen, said method including the steps of placing a plurality of said support bars at spaced intervals around a substantially circular path in a holder; supplying the elongate member which is to be attached to said support bars; attaching the elongate member and support bars at at least some of the intersections of the same by welding to allow the join of said elongate member to the support bars; and wherein using feed means to cause relative movement between the elongate member supply and the support bars so as to allow the progressive joining of the at least one elongate member to the support bars to form the screen.
Typically the screen which is formed is substantially cylindrical.
In one embodiment the screen is cut after forming to form a screen of a desired shape.
Typically the feed means are operated to cause rotational movement of the support bars.
In one embodiment feed means are operated to cause movement of the supply of the elongate member.
Typically the welding apparatus is provided at a fixed location and includes a weld material located so as to contact with the elongate member and/or support bar.
Specific embodiments of the invention are now' described with reference to the accompanying drawings wherein Figure 1 illustrates a portion of a screen in perspective in accordance with the invention; Figure 2 illustrates a cross-section through the portion of Figure I along line AA; Figures 3a and b illustrate an elevation and cross-sectional view of a screen in accordance with a further embodiment of the in v en tio n; Figures 4a-e illustrates different cross sectional shapes for the wedge wire; Figures Sa-b illustrate different cross sectional shapes for the support bars; Figure 6 illustrates a perspective view of apparatus for forming the screen in accordance with one embodiment; Figures 7a and b illustrate first and second end elevations of the apparatus of Figure 6; and Figure 8 illustrates the welding apparatus in accordance with one embodiment of the invention.
Referring firstly to Figures 1-3b there are illustrated two embodiments of screens which are formed in accordance with the invention. The screen 2 in Figures 1 and 2 comprises a series of support bars 4 which are located at spaced intervals and are located with their respective longitudinal axes in parallel in direction 6. The support bars are each located and joined a wedge wire elongate member 8 with each adjacent portion of the wedge wire having their longitudinal axis substantially parallel and in a direction which is substantially perpendicular to the direction 6. A gap 10 is provided between adjacent portions of the wedge wire 8.
As shown in Figures 4a-e the wedge wire 8 can be provided in a number of different configurations and particularly with regard to the cross sectional shape of the same. However, in each case, the cross sectional shape is substantially triangular and a face 12 of the same is provided to form the external screening face of the screen and the point 14 is provided to be located and joined with the support bar as is shown in Figure 2.
In Figures 1 and 2 the wedge wire is joined to the support bars such that the axis 16 of the wedge wire is substantially perpendicular to the longitudinal axis of the support bars. This in turn means that the faces of the respective wedge wires all lie in substantially the same plane 18.
In Figure 3 there is disclosed an alternative embodiment and in this case the wedge wire elongate member is located with, and joined to, the support bars with the axis 16 at an angle "x" which is not 90 degrees. This therefore means that the faces 12 of the wedge wires do not lie in the same plane and therefore provide, on each face 12, an exposed edge 20 which act as a "cutting" means to cut through material which may collect on the external face of the screen during filtering operations. This also allows alteration of the shape of the gap 10 between adjacent wedge wire portions and this can also have a beneficial effect when screening.
Figures 5a and b illustrate different cross sectional shapes for the support bars 4 and in which the point 22 is the part which is attached to the wedge wire.
Figures 6-8 illustrate apparatus which is used to form the screens discussed above. The apparatus includes holding means 24, 26, with the holding means 24 receiving therethrough lengths of support bars 4, one of which is shown for illustration purposed in Figure 6. The support bars 4 are passed such that the free end of each is located in the holding means 26 which, as shown, is mounted on a bed 28 and with respect to which the location of the holding means can be adjusted to suit the length of the support bars which are to be used for each screen manufacture. The support bars are mounted at spaced intervals around a substantially circular path on the holding means 24 which rotates the same as the screen is being formed such that a substantially cylindrical screen is formed about the central axis of the holding means.
Feed means 32 are provided which are offset and on which a reel of the wedge wire elongate member is mounted and from which the wedge wire is unwound in the direction 34 typically by the rotation of the support bars, once the wedge wire length has initially been connected therewith.
The wedge wire passes through guide means 36 which guide the wedge wire onto the support bars 4. The angle of introduction of the wedge wire to the support bars can be controlled so as to allow, for example, the wedge wire screen shown in Figures 1 and 2 to be created or, alternatively, if the angular adjustment is made to the wedge wire, a screen of a configuration shown in Figures 3a and b can be created. This can be achieved by alteration of the position of the feed means 32 and/ or the guide means 36 with respect to the holding means 24. In addition to the holding means 24, the body 38 of the apparatus also includes welding apparatus 40 which includes a disk of weld material 42 which is rotatable about axis 44 in contact with the wedge wire member and support bar at the time of contact of the same. A coolant supply 46 is also provided. Electrical power is supplied to the weld apparatus such that when contact is made between the disk 42, the wedge wire and support bar, a weld join is created between the wedge wire and the support bar at that location and this is repeated as the next support bar is rotated into the weld location and so on as the screen is progressively formed.
It will therefore be appreciated that the screen is effectively formed by the winding of the wedge wire elongate member around the support bars and the joining of the wedge wire and the support bars together at the intersections of the same as they pass the welding tool.
It will be appreciated that the contact between the weld disk 42 and the wedge wire causes, over time, grooves to form on the face 48 of the disk and this can cause failure of the weld if the groove becomes too deep. In order to avoid this a dressing tool is provided adjacent to the face 48 of the disk and this can be brought into contact with the face 48 to effectively dress and smooth the same to remove or minimise any grooves and hence increase the life of the disk and improve the reliability of the same.
Once the cylindrical screen has been formed to the required size, the same can be used in its cylindrical form or, alternatively the same can be cut along one side of the length of the same and then further shaped to bring the screen to the required form, such as, for example, to provide a flat screen.
There is therefore provided in accordance with the invention an efficient means of allowing the formation of the screens in a substantially automated manner and, as such allows significant efficiency benefits to be achieved whilst allowing the quality of the screen to be at east maintained and variations in the screen configuration to be achieved.

Claims (21)

  1. Claims 1. An apparatus for the formation of a screen comprising support bars and at least one elongate member located with and supported by said support bars to form the screen, said apparatus including: a holder to locate a plurality of said support bars at spaced intervals around a substantially circular path; a supply of the elongate member which is to be attached to said support bars; welding apparatus to allow the join of said elongate member to the support bars; and feed means to allow relative movement between the elongate member supply and the support bars so as to allow the progressive joining of the elongate member to the support bars to form the screen.
  2. 2. An apparatus according to claim 1, wherein the feed means causes rotational movement of the support bars and/or the feed means causes movement of the supply of the elongate member.
  3. 3. An apparatus according to claim 1, wherein the welding apparatus is provided at a fixed location and includes a weld material located so as to contact with the elongate member and/or sLipport bar.
  4. 4. An apparatus according to claim 1, wherein the weld material is substantially formed of copper.
  5. 5. An apparatus according to claim 1, wherein the elongate member is substantially triangular in cross-section.
  6. 6. An apparatus according to claim 5, wherein one of the corners of the triangular cross-section is located SO as to contact and join with the support bars.
  7. 7. An apparatus according to claim 1, wherein a continuous elongate member is used to form substantially the entire screen.
  8. 8. An apparatus according to claim 7, wherein respective movement between the supply of the elongate member and support bars allows the elongate member to follow a helical path as it is joined to the support bars.
  9. 9. An apparatus according to claim 1, wherein once the screen has been formed, the same is retained in substantially cylindrical shape.
  10. 10. An apparatus according to claim 1, wherein once the screen has been formed, the same is cut along its length and then flattened to form a flat screen or any other form of curved screen.
  11. 11. An apparatus according to claim 1, wherein the relative movement between the support bars and the supply of the elongate member is selected so as to allow control of the spacing between the adjacent portions of the elongate member when joined to the support bars.
  12. 12. An apparatus according to claim 1, wherein the size of the elongate member can be selected to suit the subsequent use of the screen which is subsequently desired.
  13. 13. An apparatus according to claim 1, wherein the welding means includes a dressing member which locates on the welding material and is provided in the form of a disk
  14. 14. An apparatus according to claim 13, wherein the dressing member locates on the particular external face of the disk that contacts the elongate member to achieve the weld.
  15. 15. An apparatus according to claim 13, wherein the dressing member is used at intervals to smooth the external face and hence prevent grooves from forming on the weld material disk.
  16. 16. An apparatus according to claim 13, wherein the dressing member is in constant contact with the weld material.
  17. 17. An apparatus according to claim 13, wherein the dressing member is selectively contacted with the weld material at time intervals in order to allow the weld material to be dressed and provide a substantially uniform surface for contact with the elongate member.
  18. 18. An apparatus according to claim 1, wherein the elongate member is presented to be joined to the support bars such that the face of the elongate member which is to form an external face of the screen, once formed, lies substantially parallel with the support bar to which the same is joined.
  19. 19. An apparatus according to claim 1, wherein the elongate member is presented to the support bars such that the face of the elongate member which is to form an external face of the screen, once formed, lies at an angle to the support bar such that the said face is not parallel with the support bar.
  20. 20. An apparatus according to claim 19, wherein the particular angle of presentation of the elongate member is dependent upon the particular use and screening and/or filtering effect which is desired to be achieved.
  21. 21. An apparatus according to any of the preceding claims wherein the screen which is formed is cylindrical.22 An apparatus according to any of the preceding claims wherein the screen is cut to allow the same to be formed into a desired shape.23 A method for the formation of a screen comprising support bars and at least one elongate member located with and supported by said support bars to form the screen, said method including the steps of placing a plurality of said support bars at spaced intervals around a substantially circular path in a holder; supplying the elongate member which is to be attached to said support bars; attaching the elongate member and support bars at at least some of the intersections of the same by welding to allow the join of said elongate member to the support bars; and wherein using feed means to cause relative movement between the elongate member supply and the support bars so as to allow the progressive joining of the at least one elongate member to the support bars to form the screen.24. A method according to claim 23 wherein the screen which is formed is substantially cylindrical.25. A method according to claim 23 wherein the screen is cut after forming to form a screen of a desired shape.26. A method according to claim 23 wherein the feed means are operated to cause rotational movement of the support bars.27. A method according to any of claims 23-26 wherein the feed means are operated to cause movement of the supply of the elongate member.28. A method according to claim 23 wherein the welding apparatus is provided at a fixed location and includes a weH material located so as to contact with the elongate member and/or support bar.
GB1315661.7A 2012-09-05 2013-09-03 Apparatus and method for forming screens Active GB2508470B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201215801A GB201215801D0 (en) 2012-09-05 2012-09-05 Apparatus and method for forming screens

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GB201315661D0 GB201315661D0 (en) 2013-10-16
GB2508470A true GB2508470A (en) 2014-06-04
GB2508470B GB2508470B (en) 2018-10-10

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GB1315661.7A Active GB2508470B (en) 2012-09-05 2013-09-03 Apparatus and method for forming screens

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101526A (en) * 1960-02-12 1963-08-27 Edward E Johnson Inc Process for fabricating screens
US3920170A (en) * 1973-03-23 1975-11-18 Universal Oil Prod Co Apparatus for making cylindrical screens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6089316A (en) * 1997-08-01 2000-07-18 Spray; Jeffery A. Wire-wrapped well screen
US7281319B1 (en) * 2004-04-30 2007-10-16 Daniel Allford Apparatus for manufacturing wire wound filter screens
DE102005034789A1 (en) * 2005-07-21 2007-01-25 Boll & Kirch Filterbau Gmbh Method for producing metallic gap filters, method for producing metallic canned filters and canned filters
US9023456B2 (en) * 2011-03-18 2015-05-05 Bilfinger Water Technologies, Inc. Profiled wire screen for process flow and other applications

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101526A (en) * 1960-02-12 1963-08-27 Edward E Johnson Inc Process for fabricating screens
US3920170A (en) * 1973-03-23 1975-11-18 Universal Oil Prod Co Apparatus for making cylindrical screens

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Publication number Publication date
GB2508470B (en) 2018-10-10
GB201315661D0 (en) 2013-10-16
GB201215801D0 (en) 2012-10-24

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