EP2067893B1 - Câble métallique à âme fibreuse en polymère à cristaux liquides - Google Patents

Câble métallique à âme fibreuse en polymère à cristaux liquides Download PDF

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Publication number
EP2067893B1
EP2067893B1 EP20080170693 EP08170693A EP2067893B1 EP 2067893 B1 EP2067893 B1 EP 2067893B1 EP 20080170693 EP20080170693 EP 20080170693 EP 08170693 A EP08170693 A EP 08170693A EP 2067893 B1 EP2067893 B1 EP 2067893B1
Authority
EP
European Patent Office
Prior art keywords
rope
metal
core
strands
liquid
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.)
Active
Application number
EP20080170693
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German (de)
English (en)
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EP2067893A2 (fr
EP2067893A3 (fr
Inventor
Francesco Asnao
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.)
Redaelli Tecna SpA Divisione Teci
Original Assignee
Redaelli Tecna SpA Divisione Teci
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Publication of EP2067893A3 publication Critical patent/EP2067893A3/fr
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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0673—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a rope configuration
    • D07B1/0686—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a rope configuration characterised by the core design
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/005—Composite ropes, i.e. ropes built-up from fibrous or filamentary material and metal wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/1012—Rope or cable structures characterised by their internal structure
    • D07B2201/102—Rope or cable structures characterised by their internal structure including a core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/1028—Rope or cable structures characterised by the number of strands
    • D07B2201/1032—Rope or cable structures characterised by the number of strands three to eight strands respectively forming a single layer
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/104—Rope or cable structures twisted
    • D07B2201/1044—Rope or cable structures twisted characterised by a value or range of the pitch parameter given
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/201—Wires or filaments characterised by a coating
    • D07B2201/2011—Wires or filaments characterised by a coating comprising metals
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2021—Strands characterised by their longitudinal shape
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2023—Strands with core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2036—Strands characterised by the use of different wires or filaments
    • D07B2201/2037—Strands characterised by the use of different wires or filaments regarding the dimension of the wires or filaments
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2038—Strands characterised by the number of wires or filaments
    • D07B2201/204—Strands characterised by the number of wires or filaments nine or more wires or filaments respectively forming multiple layers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2055—Cores characterised by their structure comprising filaments or fibers
    • D07B2201/2056—Cores characterised by their structure comprising filaments or fibers arranged parallel to the axis
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2066—Cores characterised by the materials used
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2067—Cores characterised by the elongation or tension behaviour
    • D07B2201/2068—Cores characterised by the elongation or tension behaviour having a load bearing function
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D07B2205/2039—Polyesters
    • D07B2205/2042—High performance polyesters, e.g. Vectran
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/202—Environmental resistance
    • D07B2401/2025—Environmental resistance avoiding corrosion
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2055—Improving load capacity
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/206—Improving radial flexibility
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/025—Preforming the wires or strands prior to closing

Definitions

  • the present invention refers to a metal rope with improved features, in particular having high ultimate tensile strength and a high number of sustainable fatigue cycles.
  • the metal ropes that are known today consist of a plurality of strands wound around a central core.
  • the strands in turn consist of a set of metal wires arranged in a helix around a core consisting of a metal wire or a thread of natural or synthetic fibre.
  • the metal wires are obtained by drawing the rod and, depending on applications, the metal wires are subsequently coated, for example via a galvanising operation.
  • these wires are of the galvanised twice drawn class "B" type according to the standard ISO 2232.
  • the strands are initially subjected to a so-called preforming operation during which they take on a helical shape that they maintain in the final formation of the rope and subsequently they are subjected to the stranding operation that consists of winding the metal wires around the core.
  • composition of a rope is distinguished by the number of strands constituting the rope, the number of wires forming each strand and the type of metal core, for example made of steel, or textile core, made of natural or synthetic fibres.
  • the metal wires can be protected by appropriate lubrication or be coated by galvanising, depending on the aggressiveness/corrosiveness of the environment in which the respective ropes are to be used.
  • Ropes with a steel core also have the drawback of being subject to the phenomenon of pitting, due to the contact of the external strands with the metal core, which produces internal damage that is difficult to assess during the step of periodical checking and which determines an average life of the rope that is significantly lower than that of ropes with a textile core.
  • the ropes with a core of textile fibre have always been known for the flexibility that they provide, for capacity to absorb stress transmitted by the system (angle of deflection and shock) and for the great number of fatigue cycles that they are able to bear.
  • ropes with a textile core have a decidedly lower ultimate tensile strength value compared with that of a rope with a metal core.
  • the object of the present invention is to remedy the aforesaid drawbacks and in particular that of creating a metal rope that has great high ultimate tensile strength and is able to withstand a great number of fatigue cycles.
  • Another object of the present invention is to provide a metal rope that is not substantially subject to damage even when used in humid or aggressive/corrosive environments.
  • the last object of the present invention is to devise a metal rope that is not substantially subject to pitting, providing a long average life.
  • a metal rope is shown, which is overall indicated by 10.
  • This metal rope 10 consists of a plurality of strands 12 wound around a central core 14, in turn consisting of a set of metal wires 11 arranged as a helix around a core 13 constituted by a metal wire or a natural or synthetic textile fibre.
  • the central core 14 of the rope 10 is made of textile fibre spun from a liquid-crystal polymer.
  • This fibre is characterised by orientation of the molecules thereof along the axis of the fibre, the final structure of which, because it is highly orientated, has high resistance properties and a high elasticity module.
  • the fibre spun from a liquid-crystal polymer is Vectran TM .
  • this fibre can be summarised as toughness and great modulus, low humidity absorption, high resistance to a plurality of chemical agents, low thermal expansion coefficient, high dielectric resistance, high resistance to creep, high resistance to abrasion, high maintenance of mechanical properties, also following exposure to repeated temperature cycles, and excellent vibration-damping features.
  • the core 13 of the strands is made of textile fibre spun from a liquid-crystal polymer and is preferably made of Vectran TM .
  • the Applicant has found that in the construction of the metal rope 10 with a central core 14 made of fibre spun from a liquid-crystal polymer, with the adoption of stranding ratios of the rope and of preferential stranding and of a particular structure of the yarn with which the central core 14 is made, ultimate tensile strength values are reached that are comparable to a rope with a steel core 17, without penalising the advantages provided by the textile cores.
  • the stranding ratios that provide excellent results in terms of ultimate tensile strength are comprised between 6.5 and 7.2 times the diameter of the rope, whilst the closing/stranding ratios of the steel wires are comprised between 6.9 and 7.3 times diameter of the strand.
  • the fibre spun from a liquid-crystal polymer preferably consists of a number of parallel strands comprised between 5 and 18.
  • the Applicant has further conducted various tests run on ropes with a nominal diameter of 4.9 mm, a first rope of which is of the type with a steel core and a second rope of which is of the type according to the present invention.
  • a first test was conducted by means of a machine consisting of two spindles on which the rope was anchored, the first of which was an idling spindle and a second spindle of which was suitable for rotating the rope.
  • the two spindles of this machine are arranged parallel alongside one another so that the rope being tested, being anchored by the first on the second, is arranged in a "U".
  • the driven spindle is mounted on a rail and is piloted to approach and move away.
  • the test consists of twisting the rope and letting the rope rotate until a first breakage of the wire occurs, detected by the sensor located near the zone where the folding of the rope occurs.
  • the metal rope according to the present invention is able to support a number of fatigue cycles (more than 10,000) that is 20% greater than the metal rope with a steel core (approximately 8000) and comparable with the metal ropes with a textile core.
  • a second test has enabled the ultimate tensile strength of the two ropes disclosed above to be measured, from which a value that is similar and equal to 20.8 kN emerged.
  • the metal rope 10 according to the present invention thus has great ultimate tensile strength, high resistance to fatigue, being in addition to that able to provide good support to the geometry of the rope even after several work cycles.
  • the rope 10 according to the present invention is not substantially subject to the phenomenon of pitting inasmuch as the external strands 12 do not undergo rubbing against a very stiff material such as steel but against a central core 14 made of a fibre spun from a liquid-crystal polymer.
  • the metal rope 10 according to the present invention does not require thorough lubrication, it being sufficient to limit lubrication only to the external strands, and it is not subject to problems caused by internal corrosion even if used in aggressive/corrosive environments.
  • the particular core 14 further confers on the rope great flexibility and good ease of handling.
  • the stabilising effect induced by the core 14 made of liquid-crystal polymer fibre is particularly clear if the rope is subjected to transverse pressure, to twisting due to wide angles of lateral deviation, for example on the pulleys or drums around which they run, to impact loads or to tearing and pump effects.
  • the metal rope according to the present invention is further characterised by modest ultimate elongation equal to a maximum of 3-4 %.

Landscapes

  • Ropes Or Cables (AREA)

Claims (7)

  1. Câble métallique (10) consistant en une pluralité de torons (12) enroulés autour d'une âme centrale (14) où ladite âme centrale (14) consiste en un nombre de torons d'âme parallèles en fibre filée à partir d'un polymère à cristaux liquides caractérisé en ce que le nombre est compris entre 5 et 18.
  2. Câble métallique (10) selon la revendication 1 caractérisé en ce que ledit polymère à cristaux liquides à partir duquel ladite fibre est filée est un polyester entièrement aromatique.
  3. Câble métallique (10) selon une quelconque revendication précédente caractérisé en ce qu'il est fait avec des rapports de toronage desdits torons (12) compris entre 6,5 et 7,2 fois le diamètre du câble.
  4. Câble métallique (10) selon une quelconque revendication précédente caractérisé en ce que lesdits torons (12) sont faits avec des rapports de fermeture/toronage des fils métalliques (11) compris entre 6,9 et 7,3 fois le diamètre du toron.
  5. Câble métallique (10) selon une quelconque revendication précédente caractérisé en ce que lesdits torons (12) consistent en une pluralité de fils métalliques (11) en acier galvanisé enroulés autour d'une âme correspondante (13) des torons.
  6. Câble métallique (10) selon la revendication 5 caractérisé en ce que ladite âme (13) des torons est faite de fibre filée à partir d'un polymère à cristaux liquides.
  7. Câble métallique (10) selon la revendication 6 caractérisé en ce que ladite âme (13) des torons est faite d'une fibre filée à partir d'un polyester entièrement aromatique à cristaux liquides.
EP20080170693 2007-12-05 2008-12-04 Câble métallique à âme fibreuse en polymère à cristaux liquides Active EP2067893B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20072281 ITMI20072281A1 (it) 2007-12-05 2007-12-05 Fune metallica a caratteristiche migliorate

Publications (3)

Publication Number Publication Date
EP2067893A2 EP2067893A2 (fr) 2009-06-10
EP2067893A3 EP2067893A3 (fr) 2010-02-17
EP2067893B1 true EP2067893B1 (fr) 2012-07-11

Family

ID=40315537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080170693 Active EP2067893B1 (fr) 2007-12-05 2008-12-04 Câble métallique à âme fibreuse en polymère à cristaux liquides

Country Status (4)

Country Link
EP (1) EP2067893B1 (fr)
ES (1) ES2391425T3 (fr)
IT (1) ITMI20072281A1 (fr)
PT (1) PT2067893E (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11459209B2 (en) 2017-11-10 2022-10-04 Otis Elevator Company Light weight load bearing member for elevator system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6131869B2 (ja) * 2014-01-29 2017-05-24 三菱電機ビルテクノサービス株式会社 エレベータの主索
US11548763B2 (en) 2018-08-10 2023-01-10 Otis Elevator Company Load bearing traction members and method
CN115956059A (zh) * 2020-08-27 2023-04-11 三菱电机株式会社 带、带的制造方法和电梯

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034547A (en) * 1975-08-11 1977-07-12 Loos August W Composite cable and method of making the same
US4176705A (en) * 1976-01-16 1979-12-04 The Goodyear Tire & Rubber Company Tire cord with a synthetic fiber core
JPS53122842A (en) * 1977-03-30 1978-10-26 Teikoku Sangyo Kk Wire rope
DE3632953A1 (de) * 1986-09-27 1988-04-14 Trefilarbed Drahtwerk Drahtseil
GB2280686B (en) * 1993-08-04 1997-05-07 Bridon Plc Orientated polymeric core for wire ropes
CA2262307C (fr) * 1999-02-23 2006-01-24 Joseph Misrachi Cable d'ascenseur a faible allongement
DE102007024020A1 (de) * 2007-05-18 2008-11-20 Casar Drahtseilwerk Saar Gmbh Seil, kombiniertes Seil aus Kunststofffasern und Stahldrahtlitzen, sowie kombinierte Litze aus Kunststofffasern und Stahldrähten
DE102007026774A1 (de) * 2007-06-09 2008-12-11 Continental Aktiengesellschaft Verstärkungshybridkord für elastomere Erzeugnisse, insbesondere als Karkasslage oder Gürtellage von Fahrzeugluftreifen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11459209B2 (en) 2017-11-10 2022-10-04 Otis Elevator Company Light weight load bearing member for elevator system

Also Published As

Publication number Publication date
EP2067893A2 (fr) 2009-06-10
ITMI20072281A1 (it) 2009-06-06
EP2067893A3 (fr) 2010-02-17
PT2067893E (pt) 2012-10-09
ES2391425T3 (es) 2012-11-26

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