EP2508459B1 - Câble pour ascenseurs, et dispositif d'ascenseur - Google Patents

Câble pour ascenseurs, et dispositif d'ascenseur Download PDF

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Publication number
EP2508459B1
EP2508459B1 EP09851847.5A EP09851847A EP2508459B1 EP 2508459 B1 EP2508459 B1 EP 2508459B1 EP 09851847 A EP09851847 A EP 09851847A EP 2508459 B1 EP2508459 B1 EP 2508459B1
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EP
European Patent Office
Prior art keywords
rope
resin layer
thermoplastic polyurethane
elevator
resin component
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EP09851847.5A
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German (de)
English (en)
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EP2508459A4 (fr
EP2508459A1 (fr
Inventor
Michio Murai
Atsushi Mitsui
Hiroyuki Nakagawa
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00—Other common features of elevators
    • B66B7/06—Arrangements of ropes or cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00—Other common features of elevators
    • B66B7/06—Arrangements of ropes or cables
    • B66B7/062—Belts
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B5/00—Making ropes or cables from special materials or of particular form
    • D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
    • D07B5/006—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties by the properties of an outer surface polymeric coating
    • 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
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
    • D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
    • 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
    • D07B2201/2083—Jackets or coverings
    • D07B2201/2087—Jackets or coverings being of the coated type
    • 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
    • D07B2201/2083—Jackets or coverings
    • D07B2201/2092—Jackets or coverings characterised by the materials used
    • 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
    • D07B2205/2003—Thermoplastics
    • 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
    • D07B2205/2064—Polyurethane resins
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2007—Elevators

Definitions

  • the present invention relates to an elevator rope used for suspending a car in an elevator, and an elevator apparatus.
  • an elevator apparatus has the following structure. That is, a rope is looped around a sheave that is fixed to a motor of a hoisting machine, and a car is suspended at one end of the rope while a weight for keeping balance with the car is suspended at the other end of the rope.
  • a sheave having a diameter that is at least 40 times as large as the diameter of the rope hereinafter, referred to as "rope diameter"
  • the diameter of the sheave (hereinafter, referred to as "sheave diameter”) has a direct relationship with drive torque of the motor that is necessary to raise and lower the car. Therefore, various components of the elevator apparatus as typified by the motor can be reduced in size and weight by reducing the sheave diameter. In particular, in order to reduce the sheave diameter, the rope diameter also needs to be reduced for the reason described above.
  • an elevator rope which is obtained by twisting together a plurality of strands formed by twisting a plurality of steel wires together, and covering it with a resin material on its outermost periphery (see, for example, Patent Document 1).
  • An elevator apparatus using such an elevator rope is driven by a frictional force between the sheave and the resin material that covers the outermost periphery of the rope. Therefore, there is a demand for improvement and stabilization of the friction characteristics of the resin material.
  • a friction coefficient of a resin material is known to heavily depend on sliding velocity and temperature. It is also known that viscoelastic characteristics such as dynamic viscoelasticity of the resin material correlate with the sliding velocity and temperature (Williams-Landel-Ferry equation (WLF equation)). In particular, it is described that, even in the case of rubber, the viscoelastic characteristics correlate similarly with the sliding velocity and temperature, and hence viscoelastic characteristics of rubber are related to friction characteristics of rubber (see, for example, Non Patent Document 1).
  • JP 2009234791A the elevator rope is covered with resin material containing insoluble solid additive particles.
  • Non Patent Document 1 K. A. Grosch, "The relation between the friction and visco-eleastic properties of rubber," Proceedings of the Royal Society A, June 25, 1963, Vol. 274, No. 1356, p. 21-39 .
  • the friction coefficient changes depending on changes in sliding velocity and temperature, and the friction coefficient varies depending on an increase in sliding velocity or an increase in temperature. Therefore, even in the polyurethane covering material containing no wax described in Patent Document 2, the friction coefficient changes depending on changes in sliding velocity and temperature, and hence there is a problem in that it is impossible to brake a car stably. Further, in order to stop the car for a long period of time, it is necessary to maintain the static condition of the car by the frictional force between the rope and the sheave.
  • an object of the present invention is to provide an elevator rope and an elevator apparatus which can brake a car stably in a wide range of sliding velocities from a range of small sliding velocities required for maintaining a static condition of the car to sliding velocities during normal operation by covering a rope with a resin material having a stable friction coefficient independent of temperature and sliding velocity.
  • the inventors of the preset invention have made intensive studies on friction characteristics of a variety of resin materials to solve the problems, and as a result, have obtained the following findings.
  • FIG. 1 is an example of a graph showing relationships between frequencies and loss moduli E" in resin materials different in sliding velocity dependency of a friction coefficient (i.e., resin materials having different variations in friction coefficient with respect to a sliding velocity).
  • a resin material having small sliding velocity dependency of the friction coefficient has small frequency dependency of the loss modulus E" (i.e., variation in loss modulus E" is small in the case where frequency varies)
  • a resin material having large sliding velocity dependency of the friction coefficient has large frequency dependency of the loss modulus E" (i.e., variation in loss modulus E" is large in the case where frequency varies). That is, the inventors have found that the sliding velocity dependency of the friction coefficient correlates with the frequency dependency of the loss modulus E", and the sliding velocity dependency of the friction coefficient can be decreased by decreasing the frequency dependency of the loss modulus E".
  • both the frequency dependency of the loss modulus and the sliding velocity dependency of the friction coefficient can be decreased by a molded product obtained from a resin composition including two kinds of resin components having a difference in glass transition temperature of 20°C or more at a mass ratio within a predetermined range.
  • the present invention is an elevator rope comprising a rope main body and a covering resin layer that covers a periphery of the rope main body, in which the covering resin layer is formed from a molded product of a resin composition comprising a first resin component and a second resin component at a mass ratio of 90:10 to 70:30, the first resin component and the second resin component having a difference in glass transition temperature of 20°C or more.
  • the present invention is an elevator apparatus comprising the elevator rope.
  • an elevator rope and an elevator apparatus which can brake a car stably in a wide range of sliding velocities from the range of small sliding velocities required for maintaining a static condition of the car to sliding velocities during normal operation by covering a rope with a resin material having a stable friction coefficient independent of temperature and sliding velocity.
  • An elevator rope of the present invention comprises a rope main body and a covering resin layer that covers a periphery of the rope main body.
  • FIG. 2 is a cross-sectional view of the elevator rope.
  • the elevator rope comprises a rope main body 1 and a covering resin layer 2 that covers a periphery of the rope main body 1.
  • the elevator rope is characterized by the covering resin layer 2 that covers the periphery of the rope main body 1, and hence the rope main body 1 on which the covering resin layer 2 is formed is not particularly limited and may be any known one.
  • the rope main body 1 include a strand formed by twisting a plurality of steel wires together and a load-supporting member such as a cord.
  • the load-supporting member may have not only a rope shape but also a belt shape. It should be noted that load-supporting members are described in detail in Patent Documents 1 and 2, WO 2003/050348 A1 , WO 2004/002868 A1 , and the like, which are incorporated herein by reference.
  • the covering resin layer 2 is formed from a molded product of a resin composition comprising two kinds of resin components (a first resin component and a second resin component) having a difference in glass transition temperature of 20°C or more.
  • FIG. 3 shows an example of viscoelastic spectra (storage modulus E', loss modulus E", and loss tangent tan ⁇ ) of a general resin material (thermoplastic polyurethane elastomer).
  • the viscoelastic spectra were determined under the following conditions: measurement mode: bending mode; measurement frequency: 10 Hz; and temperature increase rate: 5°C/min.
  • the spectrum of the loss modulus E" has a peak at about -40°C, and the temperature corresponds to a glass transition temperature of the thermoplastic polyurethane elastomer.
  • a resin composition comprising two kinds of resin components having a difference in glass transition temperature of 20°C or more is used, and hence in the spectrum of the loss modulus E" of the covering resin layer 2 formed from a molded product of the resin composition, the peak of the loss modulus E" becomes broad or is divided into two small peaks. As a result, the frequency dependency of the loss modulus of the covering resin layer 2 formed from the molded product of the resin composition is decreased.
  • the first resin component in the resin composition for forming the covering resin layer 2 is not particularly limited as long as the first resin component and the second resin component have a difference in glass transition temperature of 20°C or more, but is preferably a thermoplastic polyurethane elastomer.
  • thermoplastic polyurethane elastomer refers to one which includes a hard segment having a urethane structure and a soft segment derived from a polyol raw material and which exhibits rubber elasticity at room temperature.
  • the thermoplastic polyurethane elastomer is classified into polyether-based, polyester-based, polycarbonate-based, silicone-based, and olefin-based thermoplastic polyurethane elastomers depending on the type of the polyol raw material used.
  • thermoplastic polyurethane elastomers may be produced by generally known methods.
  • the elastomers may be produced by copolymerization of an isocyanate, a polyol, and a chain extender as raw materials.
  • the polymerization reaction is generally known, and the blending ratio of the raw materials and synthetic conditions may be appropriately adjusted depending on the raw materials used, and are not particularly limited.
  • thermoplastic polyurethane elastomer any commercially available thermoplastic polyurethane elastomer may be used.
  • examples of the isocyanate include tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, tolidine diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, hydrogenated xylene diisocyanate, triisocyanate, tetramethylxylene diisocyanate, 1,6,11-undecane triisocyanate, 1,8-diisocyanate methyloctane, a lysine ester triisocyanate, 1,3,6-hexamethylene triisocyanate, and bicycloheptane triisocyanate. These may be used alone or in combination of two or more kinds thereof.
  • polystyrene resin examples include a polyester polyol, a polycarbonate polyol, a polyester ether polyol, a polyether polyol, a silicone polyol, and a polyolefin polyol. These may be used alone or in combination of two or more kinds thereof.
  • polyester polyol examples include: a polyester polyol obtained through a condensation reaction between a dicarboxylic acid or an esterified compound or acid anhydride thereof and a diol; and a polylactonediol obtained through ring-opening polymerization of a lactone monomer such as ⁇ -caprolactone.
  • dicarboxylic acid there may be used: aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, and azelaic acid; aromatic dicarboxylic acids such as phthalic acid, terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid; and alicyclic dicarboxylic acids such as hexahydroterephthalic acid, hexahydrophthalic acid, and hexahydroisophthalic acid.
  • aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, and azelaic acid
  • aromatic dicarboxylic acids such as phthalic acid, terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid
  • alicyclic dicarboxylic acids such as hexahydroterephthalic acid, hexahydrophthalic acid, and hexa
  • diol there may be used, for example, ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,3-butanediol, 1,4-buanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 1,3-octanediol, and 1,9-nonanediol. These may be used alone or in combination of two or more kinds thereof.
  • polycarbonate polyol examples include a polycarbonate polyol obtained by allowing diethylene carbonate, diethyl carbonate, or the like to react with one or more kinds of polyhydric alcohols such as ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9-nonanediol, and diethylene glycol.
  • polyhexamethylene carbonate diol polytrimethylene carbonate diol, poly-3-methyl(pentamethylene) carbonate diol, and copolymers thereof. These may be used alone or in combination of two or more kinds thereof.
  • polyester ether polyol examples include condensation reaction products of the aliphatic dicarboxylic acids, aromatic dicarboxylic acids, alicyclic dicarboxylic acids, or esters or acid anhydrides thereof with glycols such as diethylene glycol and a propylene oxide adduct. These may be used alone or in combination of two or more kinds thereof.
  • polyether polyol examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and the like obtained by polymerizing cyclic ethers such as ethylene oxide, propylene oxide, and tetrahydrofuran, respectively, and copolyethers thereof. These may be used alone or in combination of two or more kinds thereof.
  • silicone polyol examples include dimethylpolysiloxanediol, methylphenylpolysiloxanediol, an amino-modified silicone oil, a both-end diamine-modified silicone oil, a polyether-modified silicone oil, an alcohol-modified silicone oil, a carboxyl group-modified silicone oil, and a phenyl-modified silicone oil each having two active hydrogens at both ends. These may be used alone or in combination of two or more kinds thereof.
  • a low molecular weight polyol may be used, and examples thereof include: aliphatic polyols such as ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9-nonanediol, diethylene glycol, 1,4-cyclohexanedimethanol, and glycerin; and aromatic glycols such as 1,4-dimethylolbenzene, bisphenol A, and an ethylene oxide adduct and propylene oxide adduct of bisphenol A. These may be used alone or in combination of two or more kinds thereof.
  • the first resin component is preferably a thermoplastic polyurethane elastomer other than a polyester-based thermoplastic polyurethane elastomer from the viewpoint of prevention of hydrolysis which occurs under a usage environment.
  • the first resin component is more preferably a polyether-based thermoplastic polyurethane elastomer having a JIS A hardness (hardness specified by JIS K7215 and determined using a type A durometer) of 85 to 95.
  • the second resin component in the resin composition for forming the covering resin layer 2 is a resin component which has a glass transition temperature higher or lower by 20°C or more than that of the first resin component.
  • the second resin component having such characteristics is not particularly limited as long as it satisfies the above-mentioned conditions.
  • the second resin component is preferably a thermoplastic polyurethane elastomer obtained using, as a raw material, a polyol different from the thermoplastic polyurethane elastomer as the first resin component, or a polyamide resin.
  • the second resin component is preferably a polycarbonate-based thermoplastic polyurethane elastomer or a silicone-based thermoplastic polyurethane elastomer having a JIS A hardness (hardness specified by JIS K7215 and determined using a type A durometer) of 85 to 95 in consideration of a variety of characteristics (such as flexibility, durability, and cold resistance) required for an elevator rope.
  • JIS A hardness hardness specified by JIS K7215 and determined using a type A durometer
  • polyamide resin examples include a polyamide-based thermoplastic elastomer and a polyamide-based thermoplastic resin.
  • polyamide-based thermoplastic elastomer refers to one which includes a hard segment of a polyamide and a soft segment of a polyether or a polyester and which exhibits rubber elasticity at room temperature.
  • the elastomer is preferably a polyamide-based thermoplastic elastomer which includes a hard segment of a polyamide and a soft segment of a polyether from the viewpoint of hydrolysis resistance.
  • polyamide-based thermoplastic resin refers to a thermoplastic resin having a polyamide bond in its molecular chain, and examples thereof include nylon 6, nylon 66, nylon 11, and nylon 12. These may be used alone or in combination of two or more kinds thereof.
  • the mass ratio of the first resin component to the second resin component is 90:10 to 70:30.
  • an effect obtained by blending the second resin component in particular, a stable friction coefficient in the covering resin layer 2 cannot be obtained.
  • the mass ratio of the second resin component is too high, the characteristics of the second resin component become dominant. In consequence, the covering resin layer 2 formed from a molded product of a resin composition becomes too hard, and flexibility of the rope may be impaired or durability of the covering resin layer 2 may be lowered.
  • problems such as increased power consumption and impaired durability when the rope is bent repeatedly may be caused.
  • the resin composition for forming the covering resin layer 2 can be prepared by mixing the above-mentioned components using known means.
  • the covering resin layer 2 can be formed by molding the resin composition so that the composition covers the periphery of the rope main body 1 by known molding means such as extrusion molding or injection molding. Further, in order to stabilize physical properties of the molded product of the resin composition, a heat treatment may be carried out. Conditions for the heat treatment may be appropriately adjusted depending on the resin composition used, and are not particularly limited.
  • the glass transition temperature of the covering resin layer 2 increases, the sliding velocity dependency of the friction coefficient tends to decrease, while the elastic modulus of the covering resin layer 2 tends to increase. Therefore, in the case where a rope having formed thereon the covering resin layer 2 having a higher glass transition temperature is employed for an elevator apparatus, the flexibility of the rope is liable to be impaired or fatigue failure such as cracking of the covering resin layer 2 is liable to occur owing to stress when the rope is bent repeatedly in an environment having a temperature higher than the glass transition temperature of the covering resin layer 2.
  • the glass transition temperature of the covering resin layer 2 specified by the peak temperature of the loss modulus E" in the viscoelastic spectra, is desirably set to -20°C or less, more preferably -25°C or less in the case where there is only one peak. Meanwhile, in the case where there are two peak temperatures, the glass transition temperature of the first resin component in the covering resin layer 2 is desirably set to -20°C or less, more preferably -25°C or less.
  • the JIS A hardness (hardness specified by JIS K7215 and determined using a type A durometer) of the covering resin layer 2 is more than 98, the flexibility of the rope is liable to be impaired, resulting in increased power consumption in the case where an elevator apparatus using the rope is driven.
  • the JIS A hardness of the covering resin layer 2 is less than 85, the durability is liable to be impaired when the layer is bent repeatedly as an elevator rope. Therefore, the JIS A hardness of the covering resin layer 2 is desirably set to 85 to 98.
  • the covering resin layer 2 may be formed after an adhesive is applied in advance to the rope main body 1.
  • the adhesive is not particularly limited as long as it is an adhesive for metal and polyurethane, and examples thereof include Chemlok (registered trademark) 218 (manufactured by LORD Far East, Inc.).
  • a rope is covered with a resin material having a stable friction coefficient independent of a temperature and a sliding velocity. Therefore, in the case where the rope is used for an elevator apparatus, a car can be braked stably in a wide range of sliding velocities from a range of small sliding velocities required for maintaining a static condition of the car to sliding velocities during normal operation.
  • Pellets of a polyether-based thermoplastic polyurethane elastomer obtained by reacting polytetramethylene glycol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol were mixed with pellets of a polycarbonate-based thermoplastic polyurethane elastomer (JIS A hardness: 95, glass transition temperature: 5°C) obtained by reacting polyhexamethylene carbonate diol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol at a mass ratio of 90:10 to prepare a resin composition.
  • JIS A hardness 95, glass transition temperature: -30°C
  • the resin composition was supplied to an extrusion molding machine, and extrusion molding was carried out so that the composition covered the periphery of a rope main body, to thereby mold a covering resin layer on the periphery of the rope main body.
  • a strand formed by twisting a plurality of steel wires together as described in WO 2003/050348 A1 , was used as the rope main body, and Chemlok (registered trademark) 218 (manufactured by LORD Far East, Inc.) was applied in advance to the rope main body and dried before the formation of the covering resin layer.
  • the rope was heated at 100°C for 2 hours, to thereby obtain an elevator rope having a diameter of 12 mm.
  • the viscoelastic spectra of the covering resin layer of the elevator rope were measured. (The measurement was carried out under the following conditions: measurement mode: bending mode; measurement frequency: 10 Hz; and temperature increase rate: 5°C/min. In the Examples and Comparative Examples below, the measurement was carried out under the same conditions.) As a result, the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -30°C. Further, the JIS A hardness of the covering resin layer of the elevator rope was measured, and as a result, the JIS A hardness was found to be 95.
  • An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio of the pellets of the polyether-based thermoplastic polyurethane elastomer to the pellets of the polycarbonate-based thermoplastic polyurethane elastomer was changed to 80:20.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured. As a result, the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -28°C. Further, the JIS A hardness of the covering resin layer was found to be 95.
  • An elevator rope was obtained as in the same manner as in Example 1 except that the mass ratio of the pellets of the polyether-based thermoplastic polyurethane elastomer to the pellets of the polycarbonate-based thermoplastic polyurethane elastomer was changed to 70:30.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured. As a result, the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -25°C. Further, the JIS A hardness of the covering resin layer was found to be 95.
  • An elevator rope was obtained in the same manner as in Example 1 except for using a resin composition obtained by mixing the pellets of the polyether-based thermoplastic polyurethane elastomer used in Example 1 with pellets of a silicone-based thermoplastic polyurethane elastomer (JIS A hardness: 95, glass transition temperature: -50°C) obtained by reacting both-end carbinyl-modified siloxane, polytetramethylene glycol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol at a mass ratio of 80:20.
  • JIS A hardness 95%, 95% hydroxy-3-butanediol
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured.
  • the loss modulus E" in viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -32°C. Further, the JIS A hardness of the covering resin layer was found to be 95.
  • An elevator rope was obtained in the same manner as in Example 1 except for using a resin composition obtained by mixing the pellets of the polyether-based thermoplastic polyurethane elastomer used in Example 1 with pellets of nylon 6 (glass transition temperature: 50°C) at a mass ratio of 80:20.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured.
  • the loss modulus E" in the viscoelastic spectra was found to have two peaks, and the peak temperature corresponding to the glass transition temperature of the polyether-based thermoplastic polyurethane elastomer as the first resin component was found to be -28°C.
  • the JIS A hardness of the covering resin layer was found to be 97.
  • An elevator rope was obtained in the same manner as in Example 1 except for using a resin composition obtained by mixing the pellets of the polyether-based thermoplastic polyurethane elastomer used in Example 1 with pellets of nylon 66 (glass transition temperature: 55°C) at a mass ratio of 80:20.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured.
  • the loss modulus E" in the viscoelastic spectra was found to have two peaks, and the peak temperature corresponding to the glass transition temperature of the polyether-based thermoplastic polyurethane elastomer as the first resin component was found to be -30°C.
  • the JIS A hardness of the covering resin layer was found to be 98.
  • An elevator rope was obtained in the same manner as in Example 1 except for using a resin composition obtained by mixing the pellets of the polyether-based thermoplastic polyurethane elastomer used in Example 1 with pellets of nylon 12 (glass transition temperature: 40°C) at a mass ratio of 80:20.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured.
  • the loss modulus E" in the viscoelastic spectra was found to have two peaks, and the peak temperature corresponding to the glass transition temperature of the polyether-based thermoplastic polyurethane elastomer as the first resin component was found to be -30°C.
  • the JIS A hardness of the covering resin layer was found to be 97.
  • An elevator rope was obtained in the same manner as in Example 1 except that a covering resin layer was formed by using only the polyether-based thermoplastic polyurethane elastomer used in Example 1.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured. As a result, the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -30°C. Further, the JIS A hardness of the covering resin layer was found to be 95.
  • An elevator rope was obtained in the same manner as in Example 1 except that a covering resin layer was formed by using only the polycarbonate-based thermoplastic polyurethane elastomer used in Example 1.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured. As a result, the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be 5°C. Further, the JIS A hardness of the covering resin layer was found to be 95.
  • An elevator rope was obtained in the same manner as in Example 1 except that a covering resin layer was formed by using only the silicone-based thermoplastic polyurethane elastomer used in Example 4.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured.
  • the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -50°C.
  • the JIS A hardness of the covering resin layer was found to be 95.
  • Example 7 An elevator rope was obtained in the same manner as in Example 1 except that a covering resin layer was formed by using only the nylon 12 used in Example 7.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured.
  • the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be 40°C.
  • the JIS A hardness of the covering resin layer was found to be 100.
  • An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio of the pellets of the polyether-based thermoplastic polyurethane elastomer to the pellets of the polycarbonate-based thermoplastic polyurethane elastomer was changed to 60:40.
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured. As a result, the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -15°C. Further, the JIS A hardness of the covering resin layer was found to be 95.
  • An elevator rope was obtained in the same manner as in Example 1 except for using a resin composition obtained by mixing the polyether-based thermoplastic polyurethane elastomer used in Example 1 with pellets of a polyester-based thermoplastic polyurethane elastomer (JIS D hardness: 60, glass transition temperature: -20°C) obtained by reacting polycaprolactone diol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol at a mass ratio of 80:20.
  • JIS D hardness 60, glass transition temperature: -20°C
  • the viscoelastic spectra and JIS A hardness of the covering resin layer of the elevator rope were measured.
  • the loss modulus E" in the viscoelastic spectra was found to have one peak, and the peak temperature corresponding to the glass transition temperature was found to be -28°C. Further, the JIS A hardness of the covering resin layer was found to be 97.
  • FIG. 4 illustrates a configuration diagram of a system for this evaluation.
  • an elevator rope 10 obtained in each of Examples and Comparative Examples was wound around a sheave 11 at an angle of 180 degrees, and one end thereof was connected to a weight 12. The other end was fixed to the ground 13.
  • a load cell 14 was provided in the vicinity of a connection part between the elevator rope 10 and the weight 12.
  • the load cell 14 was provided in the vicinity of a connection part between the elevator rope 10 and the ground 13.
  • ⁇ represents a rope winding angle (i.e., 180 degrees)
  • K 2 represents a coefficient dependent on the shape of a sheave groove (i.e., 1.19).
  • the friction coefficients of the elevator ropes obtained in Examples and Comparative Examples displayed a tendency to decrease as the sliding velocity decreased.
  • the friction coefficient at a sliding velocity of 1 ⁇ 10 -5 mm/sec was able to be maintained to 75% or more of the friction coefficient at a sliding velocity of 1 mm/sec, and the variation in friction coefficient was small.
  • the friction coefficient at a sliding velocity of 1 ⁇ 10 -5 mm/sec decreased to 45% or less of the friction coefficient at a sliding velocity of 1 mm/sec, and the variation in friction coefficient was large.
  • an elevator rope and elevator apparatus which can stably brake a car in a wide range of sliding velocities from a range of small sliding velocities required for maintaining a static condition of the car to sliding velocities during normal operation by covering a rope with a resin material having a stable friction coefficient independent of temperature and sliding velocity.

Landscapes

  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Ropes Or Cables (AREA)

Claims (5)

  1. Câble d'ascenseur comprenant un corps principal de câble (1) et une couche de résine de recouvrement (2) qui recouvre une périphérie du corps principal de câble (1), où la couche de résine de recouvrement (2) est formée à partir d'un produit moulé d'une composition de résine, caractérisé en ce que ladite composition de résine comprend un premier composant de résine et un deuxième composant de résine à un rapport massique allant de 90:10 à 70:30, le premier composant de résine et le deuxième composant de résine ayant une différence de température de transition vitreuse supérieure ou égale à 20°C.
  2. Câble d'ascenseur selon la revendication 1, dans lequel le premier composant de résine et le deuxième composant de résine comprennent des élastomères de polyuréthane thermoplastiques produits en utilisant différents polyols comme matières premières.
  3. Câble d'ascenseur selon la revendication 1 ou 2, dans lequel le premier composant de résine est un élastomère de polyuréthane thermoplastique à base de polyéther et le deuxième composant de résine est au moins un composant choisi dans le groupe constitué d'élastomère de polyuréthane thermoplastique à base de polycarbonate et d'élastomère de polyuréthane thermoplastique à base de silicone.
  4. Câble d'ascenseur selon la revendication 1, dans lequel le premier composant de résine est un élastomère de polyuréthane thermoplastique à base de polyéther et le deuxième composant de résine est une résine polyamide.
  5. Appareil d'ascenseur comprenant le câble d'ascenseur selon l'une quelconque des revendications 1 à 4.
EP09851847.5A 2009-12-02 2009-12-02 Câble pour ascenseurs, et dispositif d'ascenseur Active EP2508459B1 (fr)

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PCT/JP2009/070233 WO2011067839A1 (fr) 2009-12-02 2009-12-02 Câble pour ascenseurs, et dispositif d'ascenseur

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JP2017191879A (ja) * 2016-04-14 2017-10-19 株式会社小糸製作所 発光モジュール

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KR20120088812A (ko) 2012-08-08
CN102666344A (zh) 2012-09-12
JPWO2011067839A1 (ja) 2013-04-18
JP5295386B2 (ja) 2013-09-18
KR101329386B1 (ko) 2013-11-14
WO2011067839A1 (fr) 2011-06-09
EP2508459A4 (fr) 2014-12-17
EP2508459A1 (fr) 2012-10-10
CN102666344B (zh) 2014-11-05

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