KR101329386B1 - Rope for elevators, and elevator device - Google Patents

Abstract

The present invention provides an elevator rope having a rope body and a resin coating layer covering the outer circumference of the rope body, wherein the resin coating layer includes a first resin component and a second resin component in a mass ratio of 90:10 to 70:30. In addition, the elevator rope characterized in that the difference in the glass transition temperature between the first resin component and the second resin component is composed of a molded body of a resin composition of 20 ℃ or more. The rope for an elevator of the present invention is coated with a resin material having a stable coefficient of friction regardless of temperature or slipping speed, thereby reducing the slipping speed during normal operation from the small slip speed range required for maintaining the stopped state of the car. The car can be reliably braked at a wide range of sliding speeds.

Description

Rope and elevator device for elevators {ROPE FOR ELEVATORS, AND ELEVATOR DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to elevator ropes and elevator devices for use in elevators and for hanging cars.

An elevator apparatus generally has the structure which hangs a rope to the sheave attached to the motor of the hoisting machine, hangs a car to one end of a rope, and hangs the weight to balance with a car at the other end of a rope. In an elevator apparatus having such a configuration, a sheave having a diameter of 40 times or more of the diameter of the rope (hereinafter referred to as 'rope diameter') is conventionally used to prevent premature wear and disconnection of the rope. Since the diameter of the sheave (hereinafter referred to as the "sieve diameter") is directly related to the driving torque of the motor required to elevate the car, the sheave diameter is reduced, so that various parts of the elevator apparatus including the motor can be obtained. Compactness and weight reduction are achieved. Especially, in order to make a sheave diameter small, the rope diameter must also be made small for the reason mentioned above.

However, if the rope diameter is reduced without changing the number of ropes, the strength of the ropes decreases and the stackable weight of the elevators decreases. On the other hand, increasing the number of ropes complicates the configuration of the elevator apparatus. In addition, when the sheave diameter is reduced, the bending fatigue life of the rope is shortened, and it is necessary to frequently change the rope.

As a means to solve such a problem, the elevator rope which twisted several strands of strands into strands, twisted strands into strands, and coat | covered the outermost periphery of this rope with resin material is proposed (for example, For example, refer patent document 1). In the elevator apparatus using such an elevator rope, since it is driven by the frictional force of the resin material and the sheave which coat | cover the outermost periphery of a rope, improvement and stabilization of the friction characteristic of a resin material are desirable.

As a method of improving the friction characteristic between a sheave and a rope, the elevator rope which coat | covered the rope with the polyurethane coating material containing no wax is proposed (for example, refer patent document 2).

By the way, in general, it is known that the friction coefficient of the resin material largely depends on the sliding speed and the temperature. It is also known that viscoelastic properties, such as dynamic viscoelasticity, of a resin material have a relationship between the slip speed and temperature (Williams-Landel-Ferry equation (WLF equation)). In particular, even in the case of rubber, since the same relationship exists between the viscoelastic properties, the slip speed and the temperature, it is shown that the viscoelastic properties of the rubber are related to the friction properties of the rubber (for example, Reference).

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-262482 Patent Document 2: Japanese Patent Application Laid-Open No. 2004-538382

Non-Patent Document 1: K.A. KAGrosch, `` The relation between the friction and visco-elastic properties of rubber '', Proceedings of the Royal Society A (Proceedings of the Royal) Society A), June 25, 1963, Vol. 274, No. 1356, p.21-39

As described above, in the resin material containing rubber, the coefficient of friction changes due to the change of the slipping speed or the temperature, and the frictional coefficient changes with the increase of the slipping speed or the increase of the temperature. For this reason, even in the polyurethane coating material which does not contain the wax described in patent document 2, when the sliding speed and temperature changed, the friction coefficient changed and there existed a problem that a car could not be braked stably. In addition, in order to stop the car for a long time, it is necessary to maintain the stopped state of the car by the frictional force between the rope and the sheave. Since the friction coefficient of the polyurethane coating material is large, there is a problem that the friction coefficient at the slight sliding speed cannot be stably maintained and the stop position of the car is shifted over time.

Accordingly, the present invention has been made to solve the above problems, and by covering the rope with a resin material having a stable coefficient of friction without depending on the temperature or the slipping speed, a slight slipping speed necessary for maintaining the stationary state of the car An object of the present invention is to provide an elevator rope and an elevator device capable of stably braking an automobile at a wide range of sliding speeds ranging from the area to the sliding speed in normal operation.

MEANS TO SOLVE THE PROBLEM In order to solve the said problem, the present inventors earnestly examined the friction characteristics of various resin materials, and acquired the following knowledge.

FIG. 1 is an example of the graph which shows the relationship between the frequency and loss modulus (E ") in the resin material in which the slip coefficient dependence of the friction coefficient differs (that is, the resin material in which the friction coefficient changes with respect to the slip velocity). As can be seen from Fig. 1, in the resin material having a small slip velocity dependency of the friction coefficient, the frequency dependency of the loss modulus E ″ is small (that is, the variation of the loss modulus E ″ is small when the frequency changes). In the resin material having a large sliding speed dependency of the friction coefficient, the frequency dependency of the loss modulus E ″ is large (that is, the variation of the loss modulus E ″ is large when the frequency changes). That is, it is understood that the slip speed dependence of the friction coefficient is related to the frequency dependence of the loss modulus (E ″), and that the slip speed dependence of the friction coefficient can be reduced by decreasing the frequency dependence of the loss modulus (E ″). there was.

Based on these findings, the present inventors further studied the composition of the resin material and, as a result, used two kinds of resin components having a difference in glass transition temperature of 20 ° C. or higher, and determined the mass ratio of these two resin components. It has been found that the molded product obtained from the resin composition in the range of can reduce the slip velocity dependence of the friction coefficient together with the frequency dependence of the loss modulus.

That is, the present invention is an elevator rope having a rope body and a resin coating layer covering the outer circumference of the rope body, wherein the resin coating layer has a mass ratio of 90: 10 to 70: 30 of the first resin component and the second resin component. And an elevator rope comprising a molded body of a resin composition having a difference in glass transition temperature between the first resin component and the second resin component of 20 ° C. or more.

Moreover, this invention is an elevator apparatus provided with said elevator rope.

According to the present invention, by covering the rope with a resin material having a stable coefficient of friction regardless of temperature or slipping speed, a wide range from the small slipping speed range required for maintaining the stationary state of the car to the slipping speed in normal operation can be obtained. It is possible to provide an elevator rope and an elevator device that can stably brake a car at a slipping speed.

1 is a graph showing the relationship between the frequency and the loss modulus in the resin materials having different sliding speed dependence of the friction coefficient.
2 is a cross-sectional view of the elevator rope of the present invention.
3 is a viscoelastic spectrum of a general resin material.
4 is a system configuration diagram for evaluating the friction coefficient.

Embodiment 1

An elevator rope of the present invention includes a rope body and a resin coating layer covering the outer circumference of the rope body.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of the elevator rope of this invention is described using drawing.

2 is a cross-sectional view of the elevator rope. In FIG. 2, the elevator rope includes a rope body 1 and a resin coating layer 2 covering the outer circumference of the rope body 1.

Since this elevator rope is characterized by the resin coating layer 2 which covers the outer periphery of the rope main body 1, it does not specifically limit about the rope main body 1 in which the resin coating layer 2 is formed, A well-known thing can be used. have. As an example of the rope main body 1, load support members, such as a strand and cord formed by twisting several steel wires together, are mentioned. In addition, this load bearing member is not limited to a rope shape, but may be a belt shape. In addition, the load supporting members are described in detail in Patent Documents 1 and 2, International Publication No. 2003/050348, International Publication No. 2004/002868, and the like, which are incorporated herein by reference.

The resin coating layer 2 consists of a molded body of a resin composition containing two kinds of resin components (first resin component and second resin component) having a difference in glass transition temperature of 20 ° C or more.

Here, an example of the viscoelastic spectrum (storage modulus (E '), loss modulus (E "), and loss tangent (tanδ) of a general resin material (thermoplastic polyurethane elastomer) is shown in FIG. In this viscoelastic spectrum, the measurement mode is the bending mode, the measurement frequency is 10 Hz, and the temperature increase rate is 5 ° C / min. As can be seen from FIG. 3, the spectrum of the loss modulus (E ″) has a peak at about −40 ° C., which corresponds to the glass transition temperature of the thermoplastic polyurethane elastomer.

In the present invention, by using a resin composition containing two kinds of resin components having a difference in glass transition temperature of 20 ° C. or more, a loss in the spectrum of the loss modulus (E ″) of the resin coating layer 2 composed of a molded body of the resin composition is lost. The peak of the elastic modulus E ″ is widened or divided into two smaller peaks. As a result, the frequency dependency of the loss modulus of the resin coating layer 2 composed of the molded body of the resin composition is reduced.

Although the 1st resin component contained in the resin composition which forms the resin coating layer 2 will not be specifically limited if the difference of glass transition temperature with a 2nd resin component is 20 degreeC or more, It is preferable that it is a thermoplastic polyurethane elastomer. Here, the thermoplastic polyurethane elastomer is generally composed of a hard segment of a urethane structure and a soft segment obtained from a polyol raw material, and means that it exhibits rubber elasticity at room temperature. Thermoplastic polyurethane elastomers are classified into polyethers, polyesters, polycarbonates, silicones, olefins, and the like according to the type of polyol raw material to be used.

Such thermoplastic polyurethane elastomer can be manufactured by a well-known method generally. For example, isocyanate, a polyol, and a chain extender may be used as raw materials, and these may be copolymerized. This polymerization reaction is generally known, and the mixing ratio and the synthesis conditions of the raw materials may be appropriately adjusted depending on the raw materials to be used, and are not particularly limited.

Moreover, you may use what is generally marketed as a thermoplastic polyurethane elastomer.

When obtaining a thermoplastic polyurethane elastomer by synthesis, as isocyanate, tolylene diisocyanate, 4,4'- diphenyl methane diisocyanate, 1,5-naphthylene 1,5-naphthylene diisocyanate, tolidine diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate (1,6-naphthylene diisocyanate) xylene diisocyanate, hydrogenated xylene diisocyanate, triisocyanate, tetra methyl xylene diisocyanate, 1,6,11-undecane triisocyanate, 1 1,8-diisocyanate methyl octane, lysine ester triisocyanate ), 1,3,6-hexamethylene triisocyanate (1,3,6-hexamethylene triisocyanate), bicycloheptane triisocyanate, and the like. These may be used alone or in combination of two or more.

As a polyol, polyester polyol, polycarbonate polyol, polyester ether polyol, polyether polyol, silicone polyol, polyolefin polyol, etc. are mentioned. These may be used alone or in combination of two or more.

As a polyester polyol, Polyester polyol obtained by the condensation reaction of dicarboxylic acid, its ester compound, or acid anhydride, and diol; Polylactone diol etc. which are obtained by ring-opening polymerization of lactone monomers, such as (epsilon) -caprolactone, are mentioned. Here, as a dicarboxylic acid, Aliphatic dicarboxylic acid, such as succinic acid, adipic acid, sebacic acid, 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 hexahydroisophthalic acid are used, and diols include 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 (neopentyl glycol), 1,3-octanediol, 1,9-nonanediol, and the like. These may be used alone or in combination of two or more.

Examples of the polycarbonate polyols include ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and 3- One or more of polyhydric alcohols such as methyl-1,5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9-nonanediol, diethylene glycol, diethylene carbonate, diethyl carbonate The polycarbonate polyol etc. which are obtained by making it react etc. are mentioned. Specifically, polyhexamethylene carbonate diol, polytrimethylene carbonate diol, poly 3-methyl (pentamethylene) carbonate diol, and these copolymers are mentioned. These may be used alone or in combination of two or more.

As a polyester ether polyol, the condensation reaction product of the said aliphatic dicarboxylic acid, aromatic dicarboxylic acid, alicyclic dicarboxylic acid or its ester or acid anhydride, and glycol, such as diethylene glycol and a propylene oxide adduct, etc. are mentioned. These may be used alone or in combination of two or more.

As polyether polyols, in addition to polyethylene glycol, polypropylene glycol, and polytetramethylene glycol obtained by polymerizing cyclic ethers such as ethylene oxide, propylene oxide and tetrahydrofuran, respectively, these copolyethers (copolyether) etc. are mentioned. These may be used alone or in combination of two or more.

Examples of silicone polyols include dimethyl polysiloxane diols having two active hydrogens at the terminal, methyl phenyl polysiloxane diols, amino modified silicone oils, both terminal diamine modified silicone oils, polyether modified silicone oils, alcohol modified silicone oils, and carboxyl. Group-modified silicone oil, phenyl-modified silicone oil, and the like. These may be used alone or in combination of two or more.

Examples of the polyolefin polyols include polyisoprene polyols, polybutadiene polyols or their styrenes, acrylonitrile copolymers and hydrogenated substances thereof. These may be used alone or in combination of two or more.

As the chain extender, low molecular weight polyols can be used, for example, ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentane Diol, 1,6-hexanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9-nonanediol, diethylene glycol, 1,4-cyclohexanedimethanol Aliphatic polyols such as (1,4-cyclohexanedimethanol) and glycerin; Aromatic glycol, such as 1, 4- dimethylol benzene (1, 4- dimethylolbenzene), bisphenol A, the ethylene oxide addition product of bisphenol A, and a propylene oxide addition product, is mentioned. These may be used alone or in combination of two or more.

Among various thermoplastic polyurethane elastomers, the first resin component is preferably a thermoplastic polyurethane elastomer other than the polyester-based resin from the viewpoint of preventing hydrolysis occurring under the use environment. For example, in consideration of flexibility, durability and cold resistance, it is more preferable that the polyether thermoplastic polyurethane elastomer having a JIS A hardness (hardness by a type A durometer defined in JIS K7215) of 85 or more and 95 or less.

The second resin component contained in the resin composition forming the resin coating layer 2 is a resin component having a glass transition temperature of 20 ° C. or higher or 20 ° C. or lower than the glass transition temperature of the first resin component.

The second resin component having such characteristics is not particularly limited as long as the above conditions are satisfied, but from the viewpoint of durability and abrasion resistance, a thermoplastic polyurethane elastomer using a polyol different from the thermoplastic polyurethane elastomer of the first resin component as a raw material or It is preferable that it is a polyamide resin. In addition, among various thermoplastic polyurethane elastomers, the second resin component is considered to be JIS A hardness (type A defined in JIS K7215) in consideration of various characteristics (for example, flexibility, durability, and cold resistance) required for elevator ropes. A polycarbonate-based thermoplastic polyurethane elastomer or a silicone-based thermoplastic polyurethane elastomer having a hardness by a durometer) of 85 to 95 is preferable.

Examples of the polyamide resin include polyamide-based thermoplastic elastomers and polyamide-based thermoplastic resins.

The polyamide-based thermoplastic elastomer generally means a hard segment of polyamide and a soft segment of polyether or polyester, and exhibits rubber elasticity at room temperature. Among them, from the viewpoint of hydrolysis resistance, a polyamide-based thermoplastic elastomer composed of a hard segment of polyamide and a soft segment of polyether is preferable.

The polyamide-based thermoplastic resin generally means a thermoplastic resin having a polyamide bond in a molecular chain, and examples thereof include nylon 6, nylon 66, nylon 11, nylon 12, and the like. These may be used alone or in combination of two or more.

The mass ratio between the first resin component and the second resin component is 90:10 to 70:30. If the mass ratio of the second resin component is too low, the effect of blending the second resin component (particularly, the stable coefficient of friction in the resin coating layer 2) cannot be obtained. On the contrary, if the mass ratio of the second resin component is too high, the properties of the second resin component become dominant, and the resin coating layer 2 composed of the molded body of the resin composition becomes too hard, and the flexibility of the rope is impaired or the resin coating layer ( 2) durability is lowered. As a result, when the rope is driven using the elevator apparatus, problems such as increased power consumption and poor durability when repeatedly bent occur.

The resin composition which forms the resin coating layer 2 can be prepared by mixing said component using a well-known means. This resin composition can be made into the resin coating layer 2 by shape | molding so that the outer periphery of the rope main body 1 may be covered using well-known shaping | molding means, such as extrusion molding and injection molding. Moreover, in order to stabilize the physical property of the molded object of a resin composition, you may heat-process. What is necessary is just to adjust the conditions of heat processing suitably according to the resin composition to be used, and it is not specifically limited.

As the glass transition temperature of the resin coating layer 2 increases, the slip velocity dependence of the friction coefficient decreases, while the elastic modulus of the resin coating layer 2 tends to increase. For this reason, when a rope having a resin coated layer 2 having a high glass transition temperature is used for an elevator device, the rope's flexibility is impaired or the rope is repeatedly bent in an environment higher than the glass transition temperature of the resin coated layer 2. The stress tends to cause fatigue failure such as cracking of the resin coating layer 2. For this reason, when only one said peak exists, the glass transition temperature of the resin coating layer 2 prescribed | regulated by the peak temperature of the loss modulus (E ") of a viscoelastic spectrum becomes like this. Preferably it is -20 degrees C or less, More preferably, Preferably it is -25 degrees C or less. In addition, when two said peak temperatures exist, it is preferable to make the glass transition temperature of the 1st resin component contained in the resin coating layer 2 into -20 degrees C or less, More preferably, it is -25 degrees C or less. Do.

In addition, when the JIS A hardness (hardness of the type A durometer specified in JIS K7215) of the resin coating layer 2 exceeds 98, the flexibility of the rope is impaired. There is a tendency to increase. On the contrary, when JIS A hardness of the resin coating layer 2 is less than 85, there exists a tendency for the durability at the time of repeatedly bending as an elevator rope. For this reason, JIS A hardness of the resin coating layer 2 becomes like this. Preferably it is 85 or more and 98 or less.

In an elevator rope, you may form the resin coating layer 2 after apply | coating an adhesive agent to the rope main body 1 previously from a viewpoint of improving the adhesiveness of the resin coating layer 2 with respect 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® 218 (manufactured by Rod Far East, Inc.). Can be.

The elevator ropes having the above characteristics are coated with a resin material having a stable coefficient of friction regardless of temperature or slipping speed. The car can be braked stably at a wide range of slip speeds ranging from one slip speed range to a slip speed in normal operation.

[Example]

Hereinafter, although an Example is shown and this invention is demonstrated concretely, this invention is not limited to the following Example.

(Example 1)

Pellet of polyether thermoplastic polyurethane elastomer (JIS A hardness 95, glass transition temperature -30 ° C) formed by reacting polytetramethylene glycol, 4,4'-diphenyl methane diisocyanate and 1,4-butanediol And a pellet of a polycarbonate thermoplastic polyurethane elastomer (JIS A hardness 95, glass transition temperature 5 ° C.) formed by reacting a polyhexanemethylene carbonate diol, 4,4′-diphenyl methane diisocyanate and 1,4-butanediol. It mixed in the mass ratio of 90:10, and obtained the resin composition.

Next, this resin composition was supplied to an extrusion molding machine, extruded to cover the outer circumference of the rope body, and the resin coating layer was molded on the outer circumference of the rope body. Here, the rope body is made of a strand formed by twisting a plurality of steel wires described in International Publication No. 2003/050348 to each other, and before forming the resin coating layer, Chemlock (registered trademark) 218 (Road Per Yeast Inn) Co., Ltd.) was previously apply | coated to the rope main body, and it dried.

Next, in order to stabilize the physical property of the resin coating layer, this rope was heated at 100 degreeC for 2 hours, and the elevator rope of diameter 12mm was obtained. The viscoelastic spectrum was measured for the resin coated layer of the elevator rope (in this measurement, the measurement mode was the bending mode, the measurement frequency was 10 Hz, and the temperature increase rate was 5 ° C / min. In the following examples and comparative examples, One peak was present in the loss modulus (E ”) of a viscoelastic spectrum, and the peak temperature corresponding to glass transition temperature was -30 degreeC. Moreover, JIS A hardness was 95 when the hardness of JIS A was measured about the resin coating layer of this elevator rope.

(Example 2)

An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio between the pellets of the polyether thermoplastic polyurethane elastomer and the pellets of the polycarbonate thermoplastic polyurethane elastomer was 80:20. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature is -28 ° C. , JIS A hardness was 95.

(Example 3)

An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio between the pellets of the polyether thermoplastic polyurethane elastomer and the pellets of the polycarbonate thermoplastic polyurethane elastomer was 70:30. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature is -25 ° C. , JIS A hardness was 95.

(Example 4)

The pellet of the polyether thermoplastic polyurethane elastomer used in Example 1 was reacted with both terminal carbinyl modified siloxane, polytetramethylene glycol, 4,4'-diphenyl methane diisocyanate and 1,4-butanediol An elevator rope was obtained in the same manner as in Example 1, except that a resin composition obtained by mixing a pellet of silicon thermoplastic polyurethane elastomer (JIS A hardness 95, glass transition temperature -50 ° C) at a mass ratio of 80:20 was used. . The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum. The peak temperature corresponding to the glass transition temperature is -32 ° C. , JIS A hardness was 95.

(Example 5)

Except for using the resin composition obtained by mixing the pellet of the polyether thermoplastic polyurethane elastomer used in Example 1, and the pellet of nylon 6 (glass transition temperature 50 degreeC) by the mass ratio of 80:20, it carried out similarly to Example 1. To obtain an elevator rope. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, two peaks were present in the loss modulus (E ”) of the viscoelastic spectrum, and the polyether-based thermoplastic polyurethane elastomer of the first resin component The peak temperature corresponding to the glass transition temperature was -28 deg. C and the JIS A hardness was 97.

(Example 6)

The pellets of the polyether-based thermoplastic polyurethane elastomer used in Example 1 and the resin composition obtained by mixing the pellets of nylon 66 (glass transition temperature of 55 ° C.) at a mass ratio of 80:20 were used in the same manner as in Example 1. To obtain an elevator rope. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, two peaks exist in the loss modulus (E ”) of the viscoelastic spectrum, and the polyether-based thermoplastic polyurethane elastomer The peak temperature corresponding to the glass transition temperature was -30 deg. C and the JIS A hardness was 98.

(Example 7)

In the same manner as in Example 1, except that the resin composition obtained by mixing the pellet of the polyether thermoplastic polyurethane elastomer used in Example 1 and the pellet of nylon 12 (glass transition temperature 40 ° C.) at a mass ratio of 80:20 was used. Obtained an elevator rope. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, two peaks were present in the loss modulus (E ”) of the viscoelastic spectrum, and the polyether-based thermoplastic polyurethane elastomer The peak temperature corresponding to the glass transition temperature was -30 deg. C and the JIS A hardness was 97.

(Comparative Example 1)

An elevator rope was obtained in the same manner as in Example 1 except that the resin coating layer was formed using only the polyether thermoplastic polyurethane elastomer used in Example 1. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature is -30 ° C. , JIS A hardness was 95.

(Comparative Example 2)

An elevator rope was obtained in the same manner as in Example 1 except that the resin coating layer was formed using only the polycarbonate-based thermoplastic polyurethane elastomer used in Example 1. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature is 5 ° C, JIS A hardness was 95.

(Comparative Example 3)

An elevator rope was obtained in the same manner as in Example 1 except that the resin coating layer was formed using only the silicone thermoplastic polyurethane elastomer used in Example 4. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature is -50 ° C. , JIS A hardness was 95.

(Comparative Example 4)

An elevator rope was obtained in the same manner as in Example 1 except that the resin coating layer was formed using only nylon 12 used in Example 7. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature is 40 ° C, JIS A hardness was 100.

(Comparative Example 5)

An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio between the pellets of the polyether thermoplastic polyurethane elastomer and the pellets of the polycarbonate thermoplastic polyurethane elastomer was 60:40. The viscoelastic spectrum and JIS A hardness of the resin-coated layer of the elevator rope were measured. As a result, there is one peak in the loss modulus (E ”) of the viscoelastic spectrum. The peak temperature corresponding to the glass transition temperature is -15 ° C. , JIS A hardness was 95.

(Comparative Example 6)

Polyester-based thermoplastic polyurethane elastomer formed by reacting a polyether thermoplastic polyurethane elastomer used in Example 1 with polycaprolactone diol, 4,4'-diphenyl methane diisocyanate and 1,4-butanediol The elevator rope was obtained like Example 1 except having used the resin composition obtained by mixing the pellet of (JISD hardness 60, glass transition temperature -20 degreeC) by the mass ratio of 80:20. The viscoelastic spectrum and JIS A hardness of the resin coated layer of the elevator rope were measured. As a result, one peak is present in the loss modulus (E ”) of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature is -28 ° C. , JIS A hardness was 97.

The friction coefficient was evaluated about the elevator rope obtained by the said Example and the comparative example. Moreover, about the elevator ropes of the comparative examples 4 and 5, since the resin coating layer was hard and it was not able to obtain the flexibility which can be repeatedly bent as a rope, this evaluation was not performed.

Evaluation of the friction coefficient was performed about both the small slip speed and the normal driving slip speed. The system block diagram for performing this evaluation is shown in FIG. As shown in FIG. 4, the elevator rope 10 obtained by the Example and the comparative example is wound 180 degree with respect to the sheave 11, one end is connected to the weight 12, and the other end is fixed to the ground 13 did. And in order to measure the rope tension T1 of the weight 12 side, the load cell 14 was provided in the vicinity of the connection part of the elevator rope 10 and the weight 12. As shown in FIG. Similarly, in order to measure the rope tension T2 on the ground 13 side, the load cell 14 was provided in the vicinity of the connection part of the elevator rope 10 and the ground 13.

In this system, when the sheave 11 is rotated clockwise at a predetermined speed, the rope tension T ₂ on the ground 13 side is equal to the frictional force generated between the elevator rope 10 and the sheave 11. This decreases, and a tension difference occurs between the rope tension T ₁ on the weight 12 side. The rope tensions T ₁ and T _{2 at} this time were measured by the load cell 14, and the friction coefficient between the elevator rope 10 and the sheave 11 was determined by substituting the following general formula. In addition, the measurement of the rope tensions T ₁ and T ₂ defines 1 × 10 ⁻⁵ mm / sec for the case of the slight slipping speed and 0.01 mm / sec and 1 mm / sec for the normal driving slipping speed, and these It carried out by rotating the sheave 11 clockwise at a speed. In addition, the temperature at the time of this measurement was 25 degreeC.

Is the rope contact angle (i.e., 180 degrees), and K ₂ is a coefficient (i.e., 1.19) determined by the shape of the sheave groove.

With respect to the result of the friction coefficient obtained in the above formula, the friction coefficient at the slipping speed of 1 mm / sec is set to 100, and the friction coefficient at the slipping speed of 0.01 mm / sec and 1 × 10 ^-5 mm / sec for this friction coefficient. Table 1 shows the results shown in relative values.

As can be seen from the results in Table 1, the friction coefficients of the elevator ropes obtained in Examples and Comparative Examples showed a tendency to decrease as the slipping speed became smaller. However, in the elevator rope obtained in the example, the coefficient of friction at the slipping speed of 1 × 10 ⁻⁵ mm / sec could be maintained at 75% or more of the coefficient of friction at the time of 1 mm / sec. . On the other hand, in the elevator rope obtained in the comparative example, the friction coefficient at the slipping speed of 1 × 10 ^-5 mm / sec decreased to 45% or less of the friction coefficient at the time of 1 mm / sec, and the variation in the friction coefficient was large.

In addition, as can be seen from the results of Examples 1 to 3 and Comparative Example 5, the higher the ratio of the polycarbonate-based thermoplastic polyurethane elastomer, the smaller the variation in the friction coefficient, but the poly to the polyether-based thermoplastic polyurethane elastomer If the mass ratio of the carbonate-based thermoplastic polyurethane elastomer is too high, the coating resin layer of the elevator rope becomes too hard, and it is not possible to obtain the flexibility that can be repeatedly bent as a rope.

As can be seen from the above results, according to the present invention, by covering the rope with a resin material having a stable coefficient of friction regardless of the temperature or the slipping speed, it is possible to obtain from the minute slipping speed range required for maintaining the stopped state of the car. It is possible to provide an elevator rope and an elevator device capable of stably braking the car at a wide range of sliding speeds up to the sliding speed in normal operation.

Claims (5)

An elevator rope having a rope body and a resin coating layer covering an outer circumference of the rope body,
The resin coating layer comprises a resin composition having a first resin component and a second resin component in a mass ratio of 90:10 to 70:30, and the difference in glass transition temperature between the first resin component and the second resin component is 20 ° C or more. Elevator rope, characterized in that consisting of a molded body. The method according to claim 1,
The first resin component and the second resin component is an elevator rope, characterized in that the thermoplastic polyurethane elastomer using another polyol as a raw material. The method according to claim 1,
The first resin component is a polyether thermoplastic polyurethane elastomer, and the second resin component is at least one selected from the group consisting of a polycarbonate thermoplastic polyurethane elastomer and a silicone thermoplastic polyurethane elastomer. rope. The method according to claim 1,
And said first resin component is a polyether thermoplastic polyurethane elastomer, and said second resin component is a polyamide resin. The elevator rope of Claim 1 is provided, The elevator apparatus characterized by the above-mentioned.

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