APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND TUBULAR STRUCTURE
A winding apparatus for and method of manufacturing structures (116) includes a rotating faceplate (74) upon which are mounted a forming station for forming a supply of strip material before it is wound into a desired structure and a plurality of inner supports in the form of rollers (110) mounted for rotation about an axis and with said faceplate and a plurality of outer driven rollers (92) provided on an outer faceplate (118). The inner rollers (110) are mounted for radial movement relative to the inner faceplate (74). In operation, the inner rollers (110) act to support an inner portion S1 of strip material wound thereon whilst allowing it to be supplied from an inner diameter thereof to said forming station and the outer rollers (92) act to support an outer portion S2 of said strip. Said outer rollers are driven as and when necessary to transfer material to the inner portion S1 and the radial position of the inner rollers increases as strip material is consumed from an inner diameter, thereby to maintain support of the strip supply regardless of the amount that has been consumed.
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This application is a United States national phase application under 35 U.S.C. §371 of International Patent Application No. PCT/GB2010/050055 filed on Jan. 14, 2010, and claims the benefit of Great Britain Patent Application No. 0900722.0 filed on Jan. 16, 2009, both of which are herein incorporated in their entirety by reference. The International Application was published as International Publication No. WO 2010/082059 on Jul. 22, 2010.
FIELDThe present invention relates to a winding apparatus and a method of manufacturing structures and relates particularly to the manufacture of pipes and longitudinal structures formed by winding strips of material, such as metal, Kevlar, plastic, glass fibre, composites of such materials or strips formed from layers comprising one or more of said materials in a helical relationship. Other structures such as storage vessels, towers and support structures may also benefit from features described herein.
BACKGROUNDPresently it is known to manufacture tubular structures by winding pre-formed metal strip onto a rotating mandrel such that the strip is deposited onto the mandrel in a self-overlapping manner. The strip is retained in place by mechanical deformation of an edge thereof such that it interlocks with an adjacent edge, thereby to retain the strip in place on the final structure. EP0335969 discloses an apparatus for forming a helically wound tubular structure formed from a flat strip of metal wound onto a mandrel. The flat strip is fed from one or other of a pair of supply spools mounted concentrically with the axis of the tubular structure to be made. A rotating winding head is used to wind the strip onto the mandrel and includes a plurality of powered forming rollers which impart an initial form to the cross section of the metal strip before it is passed to a final set of rollers that lay the strip onto the mandrel. An edge of the strip is then swaged over so that it becomes mechanically locked to the previous layer over which it is wound. This is a complex process. Also provided is a mechanism for ensuring the strip supply is maintained constant and this mechanism includes speed control of the forming rollers. The coaxial supply bobbins are fed from an external supply spool so as to maintain the supply thereof. A welding station is used to join one end of the strip material to another.
U.S. Pat. No. 4,738,008 discloses a winding apparatus for forming a non-rotating helix of metal strip having a rotating store of metal strip provided radially outward of a winding head and means for providing the store of material to the winding head which rotates at a different speed to the store of material. In this process it is necessary to stop the process when the strip material has been consumed and a fresh supply thereof is added before production can be commenced. This can be a very lengthy process.
SUMMARY OF THE INVENTIONIt is an object of the present invention to provide an apparatus for and method of manufacturing tubular structures which reduces and possibly overcomes some of the problems associated with the prior art.
Accordingly, the present invention provides a winding apparatus comprising an inner faceplate rotatably mounted for rotation about a longitudinal axis X-X and having an output station thereon; and an outer faceplate radially outward of said inner faceplate; wherein said inner faceplate includes a plurality of strip supports at an outer diameter thereof and onto which, in operation, a supply of material may be wound, and wherein said strip supports are radially adjustable thereby to accommodate a change in diameter of any supply of any material supplied thereto. Such an arrangement allows for the supply of strip material from an inner diameter thereof whilst also preventing a gap appearing between the supply of material and the inner supports and thus reduces and possibly eliminates unbalanced forces that might be created by unsupported strip material as it rotates about axis X.
Preferably, the supports comprise a plurality of rollers mounted for radial adjustment within radially extending slots within said outer faceplate.
Advantageously, one or more of said rollers may be mounted for rotation about a longitudinal axis at a first end of a pivot arm the otherwise free end of which is pivotally mounted to said inner faceplate.
Preferably, said apparatus further includes a plurality of second strip supports at an outer diameter of said outer faceplate.
Advantageously, said apparatus further includes a strip driving mechanism for rotating a supply of strip material supplied to said apparatus about said longitudinal axis X-X.
Preferably, said strip driving mechanism comprises a plurality of driven rollers at an outer diameter of said second faceplate which, in operation, engage with an outer diameter of a supply of strip material supplied to said apparatus. Said driven rollers may also comprise the second strip supports.
Advantageously, the apparatus further includes a strip brake for preventing rotation of an outer diameter of any strip material supplied to said apparatus relative to said faceplate. Said brake may comprise a friction brake.
Preferably, said brake comprises a driven roller having a brake system.
Advantageously, said apparatus further includes a pair of feed rollers mounted on an outer diameter of said outer faceplate for receiving a supply of strip material to said apparatus and for guiding said strip towards said inner faceplate. The apparatus may also include a strip clamping and cutting station. Said feed rollers may also form a strip clamp.
Preferably, said inner faceplate further includes a central bore for receiving a supply of core material onto which strip supplied to said apparatus may be wound.
Advantageously, said apparatus further includes a core supply mechanism for supplying a continuous or semi-continuous supply of core material to said apparatus.
The present invention will now be more particularly described by way of example only with reference to the accompanying drawings in which:
Referring now to
Referring now more particularly to
Referring to the drawings in general but particularly
In order to ensure an even feed of strip material from a supply thereof it may be desirable to provide a supply thereof in the form of stock supply 88. Advantageously this stock supply may be provided in a cassette or stock support 90 comprising a plurality of support rollers 92 positioned outside of said forming station and being circumferentially spaced around longitudinal axis X. Said support rollers 92 cooperate with a portion of the stock of strip material 88 and allows the stock to rotate in the direction of arrow D about axis X. The strip material 80 is removed from an inner diameter of said stock thereof and fed via a first strip supply guide roller 94 mounted for rotation on said faceplate 74 about an axis angled relative thereto. In order to drive the faceplate 74 one may provide a motor 96 and gear drive 98 coupled to a ring gear 100 provided on a back plate 102 which is directly linked to face plate 74 via annular portion 104 through which non rotating portion 86 extends. Also shown in
The diameter defining roller arrangement seen generally at 78 which, between them, act to curve the strip material by plastically deforming it around one of the rollers such as to define the diameter of the exiting strip are not central to the present application and the reader's attention is drawn to the present applicant's patent application PCT/GB2006/050471 which describes this feature in detail. An optional adhesive applicator 130 may also be mounted on the faceplate 74 for rotation therewith. The applicator may take a number of forms for supplying adhesive to the strip after it has been formed and one particular arrangement is shown in which a storage cassette 132 (
Referring to the drawings in general, it will be appreciated that a tubular structure may be manufactured by causing the faceplate 74 to rotate. This action in turn will cause the strip material 80 to be drawn from the cassette, passed through and around inner rollers 110 and to forming rollers 76 before being passed into diameter defining rollers 78 at which point the desired diameter is formed by appropriate positional control of the forming rollers. As the strip exits the diameter defining rollers it is directed towards the core 54 and wrapped therearound in a self overlapping or abutting relationship as shown in
Referring now briefly to
It will be appreciated that whilst the inner rollers 110 and the faceplate are shown in two different planes in
Also shown schematically in
The various stages of the winding process and replenishment steps will now be more particularly described with reference to
In
Additional features of this machine include feedback control from the computer to ensure the product diameter is maintained within desired limits and/or altered according to desired parameters. It will be appreciated that as one can control the degree of plastic deformation of the strip as it passes through the radius forming rollers 78 one can also control the final diameter of any tubular structure formed by this apparatus.
It will be appreciated that the described arrangement ensures an even supply of material. It also forms a complex interlocking profile in the material and winds the material onto a core at predetermined curvature, thereby providing a robust structure in the final windings as well as a suitable tensile compression.
It will also be appreciated that the apparatus may be used on strips of other materials such as Kevlar, plastic, glass fibre, composites of such materials or strips formed from layers comprising one or more of said materials. Indeed the machine lends itself particularly to use with some of these materials as it is able to pre-tension the strip as it is wound onto the final form of the tubular structure being formed. When used with composite materials having a portion of metal in the strip provided either as a layer or as part of any woven form thereof, said metal will act to maintain a degree of rigidity in the strip that will assist with the location thereof on the rollers and in maintaining a final curvature. Materials such as glass-fibre or Kevlar may be reinforced by a resin or other such material in the manner well known to those skilled in the art and, therefore, not described further herein. Clearly, any such materials may simply be wound into the desired shape without needing to be provided with a cross-sectional profile as described earlier herein.
Additionally, this arrangement advantageously provides a means of continuous or near continuous supply of winding material. Downtime for reloading of the apparatus with new stock is reduced, thereby also facilitating greater uniformity of the helical winding produced.
It will also be appreciated that the above described method and apparatus may be used to cover an already existing pipeline with an outer casing. In this arrangement the already existing pipeline forms a core and the machine simply rotates around the core and moves therealong so as to lay down the outer wrap of strip material onto the pipeline. Such an approach could be employed when one wishes to repair or strengthen an already existing pipeline.
Still further, it will be appreciated that if portion 86 (
Claims
1. A winding apparatus comprising;
- i) an inner faceplate rotatably mounted for rotation about a longitudinal axis X-X and having an output station thereon; and
- ii) an outer faceplate radially outward of said inner faceplate;
- wherein said inner faceplate includes a plurality of strip supports at an outer diameter thereof and onto which, in operation, a supply of material may be wound, and wherein said strip supports are radially adjustable thereby to accommodate a change in diameter of any supply of any material supplied thereto.
2. A winding apparatus as clamed in claim 1 wherein said strip supports comprise a plurality of rollers mounted for radial adjustment within radially extending slots within said outer faceplate.
3. A winding apparatus as claimed in claim 1 wherein said strip supports comprise a plurality of rollers, one or more of which is mounted for rotation about a longitudinal axis at a first end of a pivot arm the otherwise free end of which is pivotally mounted to said inner faceplate.
4. A winding head as claimed in claim 1 wherein said apparatus further includes a plurality of second strip supports at an outer diameter of said outer faceplate.
5. A winding head as claimed in claim 1 wherein said apparatus further includes a strip driving mechanism for rotating a supply of strip material supplied to said apparatus about said longitudinal axis X-X.
6. An apparatus as claimed in claim 5 wherein said strip driving mechanism comprises a plurality of driven rollers at an outer diameter of said second faceplate which, in operation, engage with an outer diameter of a supply of strip material supplied to said apparatus.
7. An apparatus as claimed in claim 5 wherein said strip driving mechanism comprises a plurality of driven rollers at an outer diameter of said second faceplate which, in operation, engage with an outer diameter of a supply of strip material supplied to said apparatus and wherein said driven rollers also comprise the second strip supports.
8. An apparatus as claimed in claim 1 wherein the apparatus further includes a strip brake for preventing rotation of an outer diameter of any strip material supplied to said apparatus relative to said faceplate.
9. A winding apparatus as claimed in claim 8 wherein said brake comprises a friction brake.
10. A winding apparatus as claimed in claim 8 wherein said brake comprises a driven roller having a brake system.
11. An apparatus as claimed in claim 1 wherein said apparatus further includes a pair of feed rollers mounted on an outer diameter of said outer faceplate for receiving a supply of strip material to said apparatus and for guiding said strip towards said inner faceplate.
12. An apparatus as claimed in claim 1 wherein said apparatus further includes a strip clamping and cutting station.
13. An apparatus as claimed in claim 12 in which said feed rollers also form a strip clamp.
14. An apparatus as claimed in claim 1 wherein said inner faceplate further includes a central bore for receiving a supply of core material onto which strip supplied to said apparatus may be wound.
15. An apparatus as claimed in claim 14 wherein said apparatus further includes a core supply mechanism for supplying a continuous or semi-continuous supply of core material to said apparatus.
16. A method of forming a tubular article on an apparatus having; an inner faceplate rotatably mounted for rotation about a longitudinal axis X and having an output station thereon; and an outer faceplate radially outward of said inner faceplate; wherein said inner faceplate includes a plurality of strip supports at an outer diameter thereof and onto which, in operation, a supply of material may be wound, and wherein said strip supports are radially adjustable thereby to accommodate a change in diameter of any supply of any material supplied thereto, said method including the steps of:
- i) winding a supply of strip material onto said inner supports;
- ii) passing a supply of said strip material from an inner diameter thereof through said inner supports to an inner diameter of said inner faceplate;
- iii) rotating said faceplate so as to cause said strip material to be so transferred; and
- iv) displacing said inner rollers radially outwardly during strip supply so as to maintain support for said strip material at an inner diameter thereof.
17. A method as claimed in claim 16 and wherein said apparatus includes a strip forming station on said inner faceplate, said method including the step of supplying said strip to said forming station and causing formed strip to be deposited in a spiral fashion so as to form a tubular structure.
18. A method as claimed in claim 16 wherein said outer rollers are driven rollers and the method includes the step of stopping said rollers and, hence the outer portion S2 of said material, retraction of said inner rollers to an inner diameter so as to allow the removal of strip material from an inner diameter of S2 and deposition thereof at an outer diameter of an inner portion S1 supported by said inner supports.
19. A method as claimed in claim 18 wherein said apparatus further includes a strip feed/clamp at an outer diameter of said apparatus and the method includes the further step of slowing the outer diameter S2 and then reversing it so as to allow an otherwise free end of said strip material to be fed back into said clamp and joining a fresh supply of strip material to said otherwise free end.
20. A method as claimed in claim 18 wherein said apparatus further includes a strip feed/clamp at an outer diameter of said apparatus and the method includes the further step of slowing the outer diameter S2 and then reversing it so as to allow an otherwise free end of said strip material to be fed back into said clamp and joining a fresh supply of strip material to said other free end and including the further step of releasing said clamp and causing fresh material to be added to said inner diameter S1 by rotating said inner faceplate.
Type: Application
Filed: Jan 14, 2010
Publication Date: Feb 23, 2012
Applicant: ITI SCOTLAND LIMITED (GLASGOW)
Inventor: Richard Martin Curtis (Essex)
Application Number: 13/144,837
International Classification: B21C 37/12 (20060101); B21C 37/06 (20060101);