EP0071273B1 - Procédé de fabrication d'un tuyau flexible boudiné, et tuyau flexible boudiné - Google Patents

Procédé de fabrication d'un tuyau flexible boudiné, et tuyau flexible boudiné Download PDF

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Publication number
EP0071273B1
EP0071273B1 EP19820106873 EP82106873A EP0071273B1 EP 0071273 B1 EP0071273 B1 EP 0071273B1 EP 19820106873 EP19820106873 EP 19820106873 EP 82106873 A EP82106873 A EP 82106873A EP 0071273 B1 EP0071273 B1 EP 0071273B1
Authority
EP
European Patent Office
Prior art keywords
strip
connection band
hose
margin
zones
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.)
Expired
Application number
EP19820106873
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German (de)
English (en)
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EP0071273A1 (fr
Inventor
Friedrich Bürcher
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19813130323 external-priority patent/DE3130323A1/de
Priority claimed from DE19823204244 external-priority patent/DE3204244A1/de
Application filed by Individual filed Critical Individual
Priority to AT82106873T priority Critical patent/ATE16361T1/de
Publication of EP0071273A1 publication Critical patent/EP0071273A1/fr
Application granted granted Critical
Publication of EP0071273B1 publication Critical patent/EP0071273B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes

Definitions

  • the invention relates to a method according to the preamble of claim 1 or to a coiled hose according to the preamble of claim 5.
  • Such hoses which are generally manufactured with cross-sectional areas in the order of magnitude of 50 to 100 cm 2 , are used for permanent installation in buildings, machines or vehicles as air, exhaust air or exhaust gas ducts.
  • a large number of requirements are placed on these hoses, in particular they should be cheap, that is to say simple to manufacture, but at the same time they should be tensile, reasonably flexible in order to avoid special deflection pieces, and in many cases they should also be flame-retardant or even non-flammable.
  • the hose should be light in weight and easy to lay.
  • metal as the hose material.
  • metal as the hose material.
  • metal flat channels which consist of aluminum sheet which is folded into a rectangular tube and is provided with a longitudinal seam seam.
  • Such a rigid pipe is fundamentally inferior to hoses in that it is supplied in certain lengths, causes complex transportation, is difficult and difficult to install with different tools, and the storage of various duct parts such as pipe sections, deflection pieces, transition pieces from round to flat channels etc. required.
  • Rigoform tubes which consist of coiled and corrugated aluminum sheet, the corrugations of which run in the longitudinal direction of the coiled strips and overlap one another in the edge region, as a result of which the cohesion between adjacent coils is established becomes.
  • the corrugations can be stretched or compressed to a certain extent, which enables the laying of curves.
  • the corresponding pipes are still relatively stiff, and a strong pull or a strong overextension of the outside of the curve can lead to loosening of the not very tensile connection between adjacent turns
  • hose wall can consist essentially of an impregnated cotton fabric or an asbestos fabric.
  • the successive layers are placed in a single overlap or multiple wrapping around the wire of a metal wire helix and wrapped around the outside with a likewise helical metal clip.
  • This structure is also known without special reference to flame-retardant hoses (US Pat. No. 4,084,309), the circumferential clip being formed from a metal strip which is folded over the edges of the fabric surrounding the wire, whereupon this folding structure is pressed together.
  • the invention has for its object to provide a simultaneously tensile, flexible, easily transportable and relocatable and if necessary with appropriate material design flame retardant or non-combustible hose, the production of which reduces the risk of cracks in the hose material.
  • the object is achieved by the invention characterized in claim 1.
  • This creates a cohesion of adjacent connections, the production of which does not place high demands on the extensibility of the material, so that the method is particularly suitable for the production of metal foil tubes.
  • Even with relatively easily tearing material such as pure aluminum foil large lengths of tube can therefore be produced in continuous production, the length of which is at most limited by the fact that the tube coming out of the manufacturing device rotates according to a simpler method of manufacture; a non-rotating hose could also be wound by running a corresponding hose forming head, but this leads to a complicated construction due to the feed of the strips and the connecting tape from the respective supply reels to the rotating forming head.
  • the pressure of the five-fold stratification must be very strong in order to produce a material cohesion approximating the pressure welding, it seems preferable, according to claim 2, to make the edges of the strip material on both sides thicker than the remaining surface of the strip material Unfold the shape so that the material of the adjacent turns finds a certain form-fitting hold to each other.
  • the strip consists of a slightly tearing material, the measure according to claim 3 may be appropriate, which enables the Strip is laid by rotation in the helix, without its free edge being subject to the risk of tearing and fraying. If necessary, the edge area on which the connecting strip is pulled can also be edged in beforehand with a hem tape.
  • the measure according to claim 4 has the advantage of an improved mutual hold of the material of the adjacent turns.
  • the method according to the invention is particularly suitable for the production of aluminum tubes in which tensile stress in the material is avoided as far as possible in view of the low tensile strength of the film material.
  • Tin foil and copper foil for the production of completely non-flammable hoses are also suitable as metal foils.
  • the method according to the invention can also advantageously be used in the processing of plastic, in particular flame-retardant plastic, and laminated metal foil.
  • the initially circular cross section of the hose produced can be permanently deformed, e.g. B. to a rectangular shape as a flat channel or to a connector that is round on the one hand and rectangular on the other. The corresponding bending of the material does not require a great deal of force and can possibly also be carried out at the construction site.
  • Fig. 1 shows the production of a coiled hose from a single strip to be coiled from a semi-rigid material, for example from 40 mm wide and 0.1 or 0.2 mm thick pure aluminum foil strip made of anodized aluminum, and a connecting strip made of hard aluminum with a width of 15 mm and one Thickness from 0.2 to 0.5 mm.
  • a tube made from these materials without the use of other agents such as adhesive tape or the like is completely non-flammable and is at the same time flexible to a certain extent, since in the event of a bend the film can fold up in the bend in the bend.
  • the number of folds is of course not very high, but such hoses, for example with a diameter of 10 cm, are generally installed once, the required bends being made, and then remain in this position for the rest of their use.
  • Pure aluminum foil of 0.1 or 0.2 mm thickness fulfills these requirements for flexibility with simultaneous bending stiffness, which is necessary for the cohesion of the adjacent turns.
  • other metal foils of comparable stiffness and flexibility can also be used for the production of non-combustible hoses and comparable plastic foils can also be used for the production of hoses, the flammability of which does not matter.
  • a corresponding metal foil strip 1 is fed according to a direction of movement 2 to a spiral guide (not shown in detail) of a known type which deflects the strip 1 onto a circular path with a longitudinal component, that is to say a helical path.
  • edge beads 4 of the strip 1 are formed in an edge bead station 3 by turning the edge over on both sides.
  • the edge bead station shown consists of a number of pressure rollers, some of which are driven rollers and some of which are rollers.
  • the strip 1 runs between two guide rollers 5, of which only the upper one is visible, while at its edges two pressure rollers 6 which set up these edges engage with their conical end face.
  • Subsequent pressure rollers 7 fold the folded hems back down onto strip 1.
  • the strip 1 is connected to an already produced piece of hose 8, which consists of the previous length of the strip 1, which is already wound into a spiral rotating in the direction of an arrow 9, with the aid of a connecting band 10.
  • the connecting strip 10 is fed to the strip 1, in the example described in a plane perpendicular to the plane of the strip 1.
  • This connecting band 10 first runs through a roughening station 11 and is then folded in a folding station 12 around one of the edges of the strip 1, in the example described around that edge which, when the strip 1 is later connected to the already existing tube piece 8, form its first free end becomes.
  • the folding takes place in such a way that approximately one third of the connecting band 10 lies on the underside, while the double width, namely two thirds of the width of the connecting band 10, runs along the upper side of the metal foil strip 1, onto which the edge bead 4 was also folded.
  • the folding leg arranged on the underside is denoted by 13, the one running on the top is denoted overall by 14.
  • the folding station 12 in turn already divides the folding leg 14 into two halves 15 and 16, of which the folding leg half 16 is bent slightly outwardly so that it can be gripped more easily in a later station.
  • the arrangement of the various pressure rollers which form the folding station 12 is not difficult for the person skilled in the art after the folding program has been presented.
  • the station 12 is shown in the course of the supply of the strip 1 to the tube piece 8, but it could also lie on the free front edge thereof. Likewise, if the function is essentially the same, it is possible for the station to engage on the opposite edge of the strip 1 and / or for the width ratio of the folding legs 13 and 14 to be reversed.
  • the strip 1 is now connected to the already existing hose section 8 as the foremost turn, in that the edge of the strip 1 not shown with the connecting strip 10, shown on the right in the strip 1 in FIG. 1, with a certain overlap area on the inside to the previously free edge the last turn of the strip 1 in the tube piece 8.
  • This edge is the one that has been folded over a certain length beforehand with the connecting strip 10, the folding leg half 16 projecting inwards.
  • the kink between the folding leg halves 15 and 16 abruptly represents the limit of the overlap between the strip material of the successive turns.
  • the tangential approach and application of the material of the following strip 1 on the inside takes place according to FIG. 1 at a location 17 hidden by the upper tube wall.
  • the folding leg half 16 is folded around the edge of the strip, which has laid itself in the angle between the folding leg halves 15 and 16, and the stratification 13-1,4-15-1,4-16 thus created becomes broad or pressed together along lines.
  • a line pressure can cause the edge beads 4 not to be completely flat-rolled, but to press the connecting band 10 sufficiently firmly onto the material of the strip 1 to give a firm connection between the successive turns.
  • the folding station 12 is in comparison to the embodiment according to FIG. 1 on the opposite edge of the strip 1, this is applied to the last turn so that its free edge is in the angle between the folding leg halves 15 and 16 on the incoming strip sets.
  • This can be particularly advantageous if the intended overlap is relatively large and thus the folding leg 16 is wide, since in this case the station 19 can be provided immediately at the point 17 when the strip 1 enters the tube rotation and it does so in terms of inside or outside protruding folding leg half 16 are no difficulties which can arise in the circular arrangement due to tensile or compressive stresses in this leg due to the changed diameter compared to the hose jacket surface.
  • station 19 only a distance far after the winding overlap has been established.
  • this station 19 is expediently arranged directly at the meeting point 17 even with the connecting band 10 running around the end of the hose section.
  • Fig. 2 shows successive processing steps in the manufacture of the hose.
  • a stage a the strip 1 and the connecting band 10 are still immediately in the state in which they were unwound from the respective supply spools.
  • stage b the strip 1 is already provided with edge beads 4 and the connecting band 11 is already in the state of being folded, the kink between the folding legs 13 and 14 being already visible.
  • Stage c shows the folding leg 14 again divided into its folding leg halves 15 and 16 by a kink.
  • stage d the free edge of the incoming strip 1 or the end turn of the tube piece 8 already produced is placed on the folding leg half 15, and in stage e the folding leg half 16 is in turn folded down onto this edge of the strip 1.
  • FIG. 3 shows a schematic representation of the connection location of adjacent turns in a representation similar to FIG. 2e, wherein arrows 21 also indicate pressing directions.
  • the strips 1 are not provided with edge beads 4, the pressure according to the arrows 21 must be very strong here in order to achieve a firm connection of the materials.
  • the edge beads 4 are present.
  • the pressing (arrows 21) takes place along a line parallel to the edge beads, as a result of which the cross-sectionally approximately S-shaped configuration of the connecting band 10 has a compressed strip in the central region, the thickness of which is practically the sum of the thicknesses of the material layers.
  • Fig. 5 shows another form of edge processing of the strip 1. This is a bending of the edge or a flanging. With a pressing in the region of this bend or this flanging, the result is that the bent edge of the strip 1 hooks onto the connecting band 10.
  • FIG. 7 shows the closing station 19 in a schematic cross section for the case of a hose constructed from two flexible strips, in which an inner spiral and an outer spiral alternate.
  • the station 19 extends over two pressing points at a distance of one spiral step, which, using rollers, presses the helically running connecting lines between the strip material of successive turns in two steps Perform ten, of which the first essentially folds over the folding leg half 16 and the second carries out the pressing along two lines.
  • the edge that lies opposite the edge covered with the connecting band 10 is bordered by a special seam band 25.
  • the seam band 25 is a thin film strip, which is first brought up in a plane perpendicular to the feed plane of the strip 1 and is bent around the edge of the strip 1. The strip edge is thus well protected and does not tend to fray, even if the thin metal foil tears easily.
  • the material is thus in seven layers, since in addition to the five layers described earlier, the two layers formed by the U-legs of the hem band 25 are added.
  • the opposite edge could also be hemmed analogously before the connecting strip is put on, in particular if the connecting strip is only applied after a certain circumferential angle in the screw area.
  • the strip material is guided through a plurality of guides arranged in a circle in order to carry out its concentricity.
  • the piece of hose 8 runs on a guide bed in the direction of an arrow 22 in accordance with the production speed and later becomes a rectangular cross section by spinning rollers 23, of which a pair or several pairs with axes are arranged tangentially to the piece of hose 8 in two mutually perpendicular directions pressed to be usable for a fire-proof flat duct ventilation system.
  • the pressure rollers 23 can also act on the hose in a separate operation after the hose produced has been separated from the helical guide according to FIG. 1, in order to avoid constructive difficulties which result from the rotation of the hose about its longitudinal axis during its winding. If the tube produced is pushed only a little way through the pairs of pressure rollers 23, a transition piece is created between the round and flat channels.
  • the hose produced can also be perforated on the side and changed with a throat, creating a branch piece.
  • the materials described for the aluminum foil strip and the aluminum connecting tape can be knurled out and expanded without great difficulty like a homogeneous film tube wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Claims (6)

1. Procédé de fabrication d'un tuyau flexible boudiné, qui consiste à prévoir au moins une bande flexible (1) suivant une disposition hélicoïdale constituée par des spires successives dans lequel la bande provient d'une réserve pour se raccorder à une partie de tuyau boudiné déjà réalisée (8), et pivotant autour de son axe longitudinal, le tuyau s'allongeant ainsi de façon constante, tandis que l'on fait se chevaucher les deux zones périphériques opposées des spires voisines qui sont ensuite assemblées deux à deux dans cette zone par l'introduction d'un ruban d'assemblage (10) constituant un assemblage mécanique supplémentaire entre les spires voisines, et que l'on rapporte par pliage dans la zone de chevauchement de façon telle qu'il vienne en prise avec les zones périphériques se chevauchant en les immobilisant l'une par rapport à l'autre, caractérisé en ce que l'on réalise ces phases du procédé de manière successive:
a) on plie le ruban d'assemblage (10) autour d'une des arêtes longitudinales de la matière en bande (1) amenée pour se raccorder à la partie de tuyau déjà réalisée (8) de façon telle qu'un rabat (14) du ruban d'assemblage situé sur la face supérieure de celle-ci et qu'un rabat (13) disposé sur sa face inférieure, avancent en même temps que la bande pour obtenir une structure à couches triples, constituée du ruban d'assemblage, de la matière en bande, et du ruban d'assemblage.
b) on fait chevaucher le bord de la matière en bande avec la zone périphérique libre de la dernière spire de la partie de tuyau déjà réalisée (5) de telle sorte que l'une des deux matières en bande- la bande amenée ou la spire d'extrémité - soit assemblée au premier (14) des rabats du ruban d'assemblage (10), et associé à l'autre au moyen d'un pli (15) ménagé dans la largeur de ce rabat, ce qui est exécuté au début ou au cours de l'enroulement de la bande (1) et chevauchement sur la bande de la dernière spire pour former la spire suivante, une zone longitudinale (16) de ce rabat (14) partiellement recouvert restant ainsi libre de sorte qu'il est formé sur la partie recou- verte (15) de ce ruban d'assemblage (10) une couche quadruple, en l'occurrence ruban d'assemblage - matière en bande d'une spire - ruban d'assemblage- matière en bande de la spire suivante.
c) on replie la partie restée libre (16) du rabat (14) sur l'arête longitudinale de la matière en bande, le pliage s'effectuant de façon telle que ladite partie libre est placée sur ladite matière en bande, en vue d'obtenir ainsi une couche quintuple, c'est-à-dire - ruban d'assemblage - matière en bande d'une spire - ruban d'assemblage - matière en bande de la prochaine spire - ruban d'assemblage -
d) et l'on compresse la couche quintuple ainsi obtenue suivant une direction normale au plan de la matière en bande et à celui du matériau constituant le ruban d'assemblage en vue de produire un assemblage solide des matières.
2. Procédé suivant la revendication 1, caractérisé en ce que les bords d'au moins l'une des bandes (1) sont retournés avant l'enroulement périphérique du ruban d'assemblage (10).
3. Procédé suivant l'une quelconque des revendications 1 ou 2, caractérisé en ce qu'avant l'enroulement hélicoïdale de la bande (1) on recouvre avec un ruban (25) la zone périphérique de cette bande (1) située en vis-à-vis de celle qui reçoit le ruban d'assemblage (10) associé à cette bande.
4. Procédé suivant l'une quelconque des revendications 1 ou 3, charactérisé en ce que la surface supérieure du ruban d'assemblage (10) et/ou celle du ruban (25) est au préalable rendue rugueuse dans les zones (en 11) au niveau desquelles ce ruban vient au contact de la matière en bande (1).
5. Tuyau boudiné composé d'au moins une bande de feuille de métal (1) disposée en spires qui se chevauchent le long d'une ligne périphérique, l'une avec l'autre et avec un ruban d'assemblage (10), caractérisé en ce qu'au moins la bande (1) comporte sur ses bords des zones de pliage (4) retournées et déportées par rapport au plan général de la bande, les zones périphériques se chevauchant étant repliées à partir des côtés opposés dans des replis situés des deux côtés dudit ruban d'assemblage (10) qui est enroulé avec la bande et se trouve au niveau des zones périphériques de cette dernière suivant une configuration en S par rapport à la section longitudinale du tuyau, ledit ruban d'assemblage ainsi que les zones périphériques repliées étant compressées suivant une direction radiale par rapport au tuyau le long de ligne disposées autour du tuyau.
6. Tuyau suivant la revendication 5, caractérisé en ce que l'une des zones périphériques de la bande (1) insérées dans les replis du ruban d'assemblage (10) est bordée par un ruban (25) présentant en section transversale la forme d'un U.
EP19820106873 1981-07-31 1982-07-29 Procédé de fabrication d'un tuyau flexible boudiné, et tuyau flexible boudiné Expired EP0071273B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106873T ATE16361T1 (de) 1981-07-31 1982-07-29 Verfahren zum herstellen eines gewendelten schlauchs und gewendelter schlauch.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE3130323 1981-07-31
DE19813130323 DE3130323A1 (de) 1981-07-31 1981-07-31 Verfahren zum herstellen eines gewendelten schlauchs und gewendelter schlauch
DE3202516 1982-01-27
DE3202516 1982-01-27
DE19823204244 DE3204244A1 (de) 1982-01-27 1982-02-08 Verfahren zum herstellen eines gewendelten schlauchs und gewendelter schlauch
DE3204244 1982-02-08

Publications (2)

Publication Number Publication Date
EP0071273A1 EP0071273A1 (fr) 1983-02-09
EP0071273B1 true EP0071273B1 (fr) 1985-11-06

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Application Number Title Priority Date Filing Date
EP19820106873 Expired EP0071273B1 (fr) 1981-07-31 1982-07-29 Procédé de fabrication d'un tuyau flexible boudiné, et tuyau flexible boudiné

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3460516D1 (en) * 1983-01-24 1986-10-02 Friedrich Burcher Coiled flexible tube

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE543926C (de) * 1932-05-25 Titeflex Metal Hose Co Biegsames Rippenrohr
AT54473B (de) * 1910-10-14 1912-07-25 Jan Rysanek Verfahren zur Herstellung gefalzter Blechrohre aus schraubenförmig gewundenen Blechstreifen.
US2337374A (en) * 1943-03-10 1943-12-21 Abel E Chernack Collapsible tubing
US2592336A (en) * 1949-03-10 1952-04-08 Wiremold Co Machine and method for forming collapsible tubing
US4084309A (en) * 1976-08-09 1978-04-18 Cecil Howard Wood Apparatus and method of manufacturing flexible ducting

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EP0071273A1 (fr) 1983-02-09

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