WO2011067839A1 - Rope for elevators, and elevator device - Google Patents

Abstract

Disclosed is a rope for elevators, which comprises a rope main body and a resin coating layer covering the outer periphery of said rope main body, wherein said resin coating layer is formed of a molded article of a resin composition, said resin composition containing a first resin component and a second resin component at a mass ratio of 90:10 to 70:30 and the difference between the glass transition temperature of said first resin component and the glass transition temperature of said second resin component being 20^oC or greater. In the aforesaid rope for elevators, a rope is coated with a resin material that has a stable friction coefficient without depending on temperature or sliding speed, which makes it possible to stably brake a cage over a wide speed range, i.e., from a minor sliding speed area required for keeping the cage in a resting state to a sliding speed in normal operation.

Description

Elevator rope and elevator equipment

The present invention relates to an elevator rope and an elevator apparatus that are used in an elevator and suspend a car.

Generally, an elevator apparatus has a configuration in which a rope is hung on a sheave attached to a motor of a hoisting machine, a car is hung on one end of the rope, and a weight is hung on the other end of the rope to balance the car. ing. In an elevator apparatus having such a configuration, a sheave having a diameter of 40 times or more the diameter of the rope (hereinafter referred to as rope diameter) has been conventionally used in order to prevent early wear and disconnection of the rope. The diameter of the sheave (hereinafter referred to as the sheave diameter) is directly related to the driving torque of the motor that is required to raise and lower the car. Therefore, by reducing the sheave diameter, an elevator apparatus such as a motor is used. The reduction in size and weight of various parts is achieved. In particular, in order to reduce the sheave diameter, the rope diameter must also be reduced for the reasons described above.

However, if the rope diameter is reduced without changing the number of ropes, the strength of the rope will be reduced and the loadable weight of the elevator will be reduced. 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 the rope needs to be frequently replaced.

As means for solving these problems, there has been proposed an elevator rope in which a plurality of steel wires are twisted into a strand, a plurality of strands are twisted into a rope, and the outermost periphery of the rope is covered with a resin material. (For example, refer to Patent Document 1). In an elevator apparatus using such an elevator rope, since it is driven by the frictional force between the resin material covering the outermost periphery of the rope and the sheave, it is desired to improve and stabilize the friction characteristics of the resin material.
As a method for improving the friction characteristics between the sheave and the rope, an elevator rope in which the rope is covered with a polyurethane coating material not containing wax has been proposed (see, for example, Patent Document 2).

Incidentally, it is generally known that the friction coefficient of a resin material largely depends on the sliding speed and temperature. It is also known that viscoelastic properties such as dynamic viscoelasticity of resin materials have a correlation (Williams-Landel-Ferry equation (WLF equation)) with sliding speed and temperature. In particular, even in the case of rubber, since there is a similar correlation between viscoelastic properties and sliding speed and temperature, it is shown that the viscoelastic properties of rubber are related to the friction properties of rubber ( For example, refer nonpatent literature 1.).

JP 2001-262482 A JP-T-2004-538382

K. A. KAGrosch, “The relationship between friction and viscoelastic properties of rubber (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, 274, 1356, p. 21-39

As described above, the friction coefficient of the resin material containing rubber changes with the change of the sliding speed and the temperature, and the friction coefficient varies with the increase of the sliding speed and the temperature. Therefore, even if it is a polyurethane coating material which does not contain the wax described in Patent Document 2, the friction coefficient changes when the sliding speed or temperature changes, and the car cannot be braked stably. there were. Further, in order to stop the car for a long time, it is necessary to maintain the stationary state of the car by the frictional force between the rope and the sheave, and the rope is covered with the polyurethane coating material containing no wax described in Patent Document 2. Since the coated polyurethane material has a large variation in friction coefficient, the friction coefficient at a minute sliding speed cannot be stably maintained, and there is a problem that the stop position of the car shifts with time.

Accordingly, the present invention has been made to solve the above-mentioned problems, and by covering a rope with a resin material having a stable coefficient of friction without depending on temperature and sliding speed, a car is provided. The purpose of the present invention is to provide an elevator rope and an elevator apparatus capable of stably braking a car in a wide range of sliding speeds ranging from a minute sliding speed range necessary for maintaining a stationary state of the vehicle to a sliding speed during normal operation. To do.

In order to solve the above-mentioned problems, the present inventors diligently studied the friction characteristics of various resin materials, and as a result, obtained the following knowledge.
FIG. 1 is an example of a graph showing the relationship between the frequency and the loss elastic modulus E ″ of resin materials having different friction coefficients depending on the sliding speed (that is, resin materials having different friction coefficients depending on the sliding speed). As can be seen from FIG. 1, the resin material whose friction coefficient has a small sliding speed dependency has a small frequency dependency of the loss elastic modulus E ″ (that is, the fluctuation of the loss elastic modulus E ″ is small when the frequency changes). On the other hand, in a resin material in which the friction coefficient has a large dependency on the sliding speed, the frequency dependence of the loss elastic modulus E ″ is large (that is, the loss elastic modulus E ″ varies greatly when the frequency changes). There is a correlation between the slip velocity dependency of the coefficient and the frequency dependency of the loss elastic modulus E ″, and by reducing the frequency dependency of the loss elastic modulus E ″, the slip velocity dependency of the friction coefficient can be reduced. It was found.

Based on such knowledge, the present inventors further examined the composition of the resin material. As a result, the present inventors used two types of resin components having a glass transition temperature difference of 20 ° C. or more, and used these two types of resin components. It has been found that a molded product obtained from a resin composition having a mass ratio of 2 in a predetermined range can reduce the dependence of the coefficient of friction on the sliding speed as well as the frequency dependence of the loss modulus.

That is, the present invention is an elevator rope including a rope body and a resin coating layer covering an outer periphery of the rope body, and the resin coating layer includes a first resin component and a second resin component. : A mass ratio of 10 to 70:30, and a molded article of a resin composition having a glass transition temperature difference of 20 ° C. or higher between the first resin component and the second resin component This is an elevator rope.
Moreover, this invention is provided with said elevator rope, It is an elevator apparatus characterized by the above-mentioned.

According to the present invention, a normal operation is performed from a minute sliding speed range required for maintaining the stationary state of the car by covering the rope with a resin material having a stable coefficient of friction without depending on the temperature and the sliding speed. It is possible to provide an elevator rope and an elevator apparatus capable of stably braking a car in a wide range of sliding speeds up to the sliding speed of the hour.

It is a graph which shows the relationship between the frequency and loss elastic modulus in the resin material from which the sliding speed dependence of a friction coefficient differs. It is sectional drawing of the rope for elevators of this invention. It is a viscoelastic spectrum of a general resin material. It is a system block diagram for evaluating a friction coefficient.

Embodiment 1 FIG.
The elevator rope of the present invention includes a rope body and a resin coating layer covering the outer periphery of the rope body.
Hereinafter, preferred embodiments of an elevator rope according to the present invention will be described with reference to the drawings.
FIG. 2 is a sectional view of the elevator rope. In FIG. 2, the elevator rope includes a rope body 1 and a resin coating layer 2 that covers the outer periphery of the rope body 1.

Since this elevator rope is characterized by the resin coating layer 2 covering the outer periphery of the rope body 1, the rope body 1 on which the resin coating layer 2 is formed is not particularly limited, and a known one can be used. Examples of the rope body 1 include a strand formed by twisting a plurality of steel wires and a load support member such as a cord. Further, the load supporting member is not limited to a rope shape, and may be a belt shape. The load support members are described in detail in Patent Documents 1 and 2, and International Publication Nos. 2003/050348 and 2004/002868, and these are incorporated herein by reference.

The resin coating layer 2 is composed of a molded body of a resin composition containing two types of resin components (first resin component and second resin component) having a glass transition temperature difference of 20 ° C. or more.
Here, an example of a viscoelastic spectrum (storage elastic modulus E ′, loss elastic modulus E ″ and loss tangent tan δ) of a general resin material (thermoplastic polyurethane elastomer) is shown in FIG. 3. In this viscoelastic spectrum, measurement is performed. The mode is bending mode, the measurement frequency is 10 Hz, and the heating rate is 5 ° C./min. As can be seen from FIG. 3, the spectrum of the loss elastic modulus E ″ has a peak at about −40 ° C. This corresponds to the glass transition temperature of the plastic polyurethane elastomer.
In the present invention, by using a resin composition containing two types of resin components having a glass transition temperature difference of 20 ° C. or higher, the loss elastic modulus E ″ of the resin coating layer 2 formed from a molded body of the resin composition is used. In the spectrum, the peak of the loss modulus E "is broad or divided into two small peaks. As a result, the frequency dependence of the loss elastic modulus of the resin coating layer 2 composed of the molded body of the resin composition is reduced.

The first resin component contained in the resin composition that gives the resin coating layer 2 is not particularly limited as long as the difference in glass transition temperature from the second resin component is 20 ° C. or more, but is a thermoplastic polyurethane elastomer. Is preferred. Here, the thermoplastic polyurethane elastomer generally means a material composed of a urethane segment hard segment and a polyol segment-derived soft segment and exhibiting rubber elasticity at room temperature. Thermoplastic polyurethane elastomers are classified into polyether-based, polyester-based, polycarbonate-based, silicone-based, olefin-based, etc., depending on the type of polyol raw material used.

Such a thermoplastic polyurethane elastomer can be generally produced by a known method. For example, an 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 of raw materials and synthesis conditions may be appropriately adjusted according to the raw materials used, and are not particularly limited.
Moreover, you may use what is generally marketed as a thermoplastic polyurethane elastomer.

When the thermoplastic polyurethane elastomer is obtained by synthesis, the isocyanates 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, lysine ester triisocyanate, 1,3,6-hexamethylene triisocyanate, bicyclo Examples include heptane triisocyanate. These can be used alone or in combination of two or more.

Examples of the polyol include polyester polyol, polycarbonate polyol, polyester ether polyol, polyether polyol, silicone polyol, and polyolefin polyol. These can be used alone or in combination of two or more.

Examples of the polyester polyol include a polyester polyol obtained by a condensation reaction of a dicarboxylic acid or its ester compound or acid anhydride and a diol; a polylactone diol obtained by ring-opening polymerization of a lactone monomer such as ε-caprolactone. Here, examples of the dicarboxylic acid include 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; hexahydroterephthalic acid, Alicyclic dicarboxylic acids such as hexahydrophthalic acid and hexahydroisophthalic acid are used. Examples of the diol include ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,3-butanediol, 1, Uses 4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 1,3-octanediol, 1,9-nonanediol Is done. These can be used alone or in combination of two or more.

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, Reaction of one or more polyhydric alcohols such as 3-methyl-1,5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9-nonanediol and diethylene glycol with diethylene carbonate, diethyl carbonate, etc. And polycarbonate polyols obtained by the above process. Specific examples include polyhexamethylene carbonate diol, polytrimethylene carbonate diol, poly 3-methyl (pentamethylene) carbonate diol, and copolymers thereof. These can be used alone or in combination of two or more.

Examples of the polyester ether polyol include a condensation reaction product of the above aliphatic dicarboxylic acid, aromatic dicarboxylic acid, alicyclic dicarboxylic acid, or an ester or acid anhydride thereof and a glycol such as diethylene glycol or a propylene oxide adduct. Can be mentioned. These can be used alone or in combination of two or more.

Examples of the polyether polyol include polyethylene glycol, polypropylene glycol and polytetramethylene glycol obtained by polymerizing cyclic ethers such as ethylene oxide, propylene oxide and tetrahydrofuran, and copolyethers thereof. These can be used alone or in combination of two or more.

Silicone polyols include dimethylpolysiloxane diol having two active hydrogens at the end, methylphenylpolysiloxane diol, amino-modified silicone oil, diamine-modified silicone oil at both ends, polyether-modified silicone oil, alcohol-modified silicone oil, carboxyl group-modified Examples include silicone oil and phenyl-modified silicone oil. These can be used alone or in combination of two or more.

Examples of the polyolefin polyol include polyisoprene polyol, polybutadiene polyol, or styrene, acrylonitrile copolymers and hydrogenated products thereof. These can be used alone or in combination of two or more.

As the chain extender, a low molecular weight polyol can be used. For example, 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-cyclohexanedi Aliphatic polyols such as methanol and glycerin; aromatic glycols such as 1,4-dimethylolbenzene, bisphenol A, ethylene oxide adduct of bisphenol A, and propylene oxide adduct. These can 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 polyester based from the viewpoint of preventing hydrolysis that occurs in the environment of use, and there are various requirements for elevator ropes. When considering various properties (for example, flexibility, durability, cold resistance), it is a polyether-based thermoplastic polyurethane elastomer having a JIS A hardness (hardness by a type A durometer defined in JIS K7215) of 85 to 95. It is more preferable.

The second resin component contained in the resin composition that provides the resin coating layer 2 is a resin component having a glass transition temperature that is 20 ° C. or more higher than the glass transition temperature of the first resin component or 20 ° C. or lower. .
The second resin component having such characteristics is not particularly limited as long as the above conditions are satisfied. However, from the viewpoint of durability and wear resistance, a polyol different from the thermoplastic polyurethane elastomer of the first resin component is used. The thermoplastic polyurethane elastomer or polyamide resin used as the raw material is preferable. In addition, among various thermoplastic polyurethane elastomers, the second resin component is JIS A hardness (JIS K7215) in consideration of various characteristics (for example, flexibility, durability, cold resistance) required for elevator ropes. A polycarbonate-based thermoplastic polyurethane elastomer or a silicone-based thermoplastic polyurethane elastomer having a hardness of 85 to 95 in terms of the hardness by a type A durometer defined by

Examples of the polyamide resin include polyamide-based thermoplastic elastomers and polyamide-based thermoplastic resins.
The polyamide-based thermoplastic elastomer generally means a material composed of a polyamide hard segment and a polyether or polyester soft segment and exhibiting rubber elasticity at room temperature. Among these, from the viewpoint of hydrolysis resistance, a polyamide-based thermoplastic elastomer composed of a polyamide hard segment and a polyether soft segment 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, and nylon 12. These can be used alone or in combination of two or more.

The mass ratio of the first resin component and the second resin component is 90:10 to 70:30. When the mass ratio of the second resin component is too low, an effect (particularly, a stable friction coefficient in the resin coating layer 2) obtained by blending the second resin component cannot be obtained. On the contrary, if the mass ratio of the second resin component is too high, the characteristics 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 rope A softness | flexibility is impaired or the durability of the resin coating layer 2 falls. As a result, when this rope is driven using an elevator device, problems such as increased power consumption and poor durability when bent repeatedly are caused.

The resin composition that gives the resin coating layer 2 can be prepared by mixing the above components using a known means. This resin composition can be made into the resin coating layer 2 by molding the resin composition so as to cover the outer periphery of the rope body 1 using a known molding means such as extrusion molding or injection molding. Moreover, in order to stabilize the physical property of the molding of a resin composition, you may heat-process. The conditions for the heat treatment may be appropriately adjusted according to the resin composition to be used, and are not particularly limited.

The higher the glass transition temperature of the resin coating layer 2 is, the smaller the dependency of the friction coefficient on the sliding speed becomes, whereas the elastic modulus of the resin coating layer 2 tends to increase. Therefore, when the rope formed with the resin coating layer 2 having a high glass transition temperature is used in an elevator apparatus, the flexibility of the rope is impaired, or the rope is repeatedly bent in an environment higher than the glass transition temperature of the resin coating layer 2. If it is applied, fatigue fracture such as cracking of the resin coating layer 2 tends to occur due to stress. For this reason, the glass transition temperature of the resin coating layer 2 defined by the peak temperature of the loss modulus E ″ of the viscoelastic spectrum is preferably −20 ° C. or less, more preferably − In addition, when there are two peak temperatures, the glass transition temperature of the first resin component contained in the resin coating layer 2 is preferably −20 ° C. or less, more preferably − It is desirable that the temperature be 25 ° C. or lower.

Further, when the JIS A hardness of the resin coating layer 2 (hardness according to the type A durometer defined in JIS K7215) exceeds 98, the flexibility of the rope is impaired, and this is applied to an elevator apparatus and driven. In some cases, power consumption tends to increase. Conversely, if the JIS A hardness of the resin coating layer 2 is less than 85, the durability when repeatedly bent as an elevator rope tends to deteriorate. Therefore, the JIS A hardness of the resin coating layer 2 is preferably 85 or more and 98 or less.

In the elevator rope, from the viewpoint of improving the adhesion of the resin coating layer 2 to the rope body 1, the resin coating layer 2 may be formed after applying an adhesive to the rope body 1 in advance. The adhesive is not particularly limited as long as it is an adhesive for metal and polyurethane, and examples thereof include Chemlock (registered trademark) 218 (manufactured by Road Far East Incorporated).

The elevator rope having the above characteristics is covered with a resin material having a stable coefficient of friction without depending on temperature and sliding speed. Therefore, when used in an elevator system, the elevator car is in a stationary state. The car can be braked stably in a wide range of sliding speeds ranging from a minute sliding speed range necessary for maintaining the vehicle to a sliding speed during normal operation.

EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated concretely, this invention is not limited to the following Example.
Example 1
Polyether methylene glycol, 4,4′-diphenylmethane diisocyanate and 1,4-butanediol reacted polyether thermoplastic polyurethane elastomer (JIS A hardness 95, glass transition temperature −30 ° C.) pellets, Mass of 90:10 with pellets of polycarbonate-based thermoplastic polyurethane elastomer (JIS A hardness 95, glass transition temperature 5 ° C.) obtained by reacting methylene carbonate diol, 4,4′-diphenylmethane diisocyanate and 1,4-butanediol The resin composition was obtained by mixing at a ratio.
Next, this resin composition was supplied to an extrusion molding machine, extrusion was performed so as to cover the outer periphery of the rope body, and a resin coating layer was formed on the outer periphery of the rope body. Here, the rope body uses a strand formed by twisting a plurality of steel strands as described in International Publication No. 2003/050348, and before the formation of the resin coating layer, Chemlock (registered) (Trademark) 218 (manufactured by Road Far East Incorporated) was previously applied to the rope body and dried.
Next, in order to stabilize the physical properties of the resin coating layer, this rope was heated at 100 ° C. for 2 hours to obtain an elevator rope having a diameter of 12 mm. When a viscoelastic spectrum was measured for the resin coating layer of this elevator rope (in this measurement, the measurement mode was a bending mode, the measurement frequency was 10 Hz, and the temperature rising rate was 5 ° C./min. Examples and Comparative Examples below) The same measurement conditions were also used in FIG. 2), and there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was −30 ° C. Also, for this elevator When the JIS A hardness of the resin coating layer of the rope was measured, the JIS A hardness was 95.

(Example 2)
An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio of the polyether thermoplastic polyurethane elastomer pellets to the polycarbonate thermoplastic polyurethane elastomer pellets was 80:20. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was − The JIS A hardness was 28 ° C. and 95.

(Example 3)
An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio of the polyether-based thermoplastic polyurethane elastomer pellets to the polycarbonate-based thermoplastic polyurethane elastomer pellets was set to 70:30. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was − The JIS A hardness was 25 ° C. and 95.

(Example 4)
Silicone system obtained by reacting the pellets of the polyether-based thermoplastic polyurethane elastomer used in Example 1 with both terminal carbovinyl-modified siloxane, polytetramethylene glycol, 4,4′-diphenylmethane diisocyanate and 1,4-butanediol Example 1 was used except that a resin composition obtained by mixing pellets of thermoplastic polyurethane elastomer (JIS A hardness 95, glass transition temperature −50 ° C.) at a mass ratio of 80:20 was used. Thus, an elevator rope was obtained. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was − The JIS A hardness was 32 ° C. and 95.

(Example 5)
Using the resin composition obtained by mixing the pellets of the polyether-based thermoplastic polyurethane elastomer used in Example 1 and the pellets of nylon 6 (glass transition temperature 50 ° C.) at a mass ratio of 80:20. Except for the above, an elevator rope was obtained in the same manner as in Example 1. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there were two peaks in the loss elastic modulus E ″ of the viscoelastic spectrum, and the polyether-based heat which is the first resin component The peak temperature corresponding to the glass transition temperature of the plastic polyurethane elastomer was −28 ° C., and the JIS A hardness was 97.

(Example 6)
Use of a resin composition obtained by mixing the polyether thermoplastic polyurethane elastomer pellets used in Example 1 and nylon 66 (glass transition temperature 55 ° C.) pellets in a mass ratio of 80:20. Except for the above, an elevator rope was obtained in the same manner as in Example 1. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there were two peaks in the loss elastic modulus E ″ of the viscoelastic spectrum, and the polyether-based heat which is the first resin component The plastic polyurethane elastomer had a peak temperature corresponding to the glass transition temperature of −30 ° C. and a JIS A hardness of 98.

(Example 7)
Use of a resin composition obtained by mixing the polyether thermoplastic polyurethane elastomer pellets used in Example 1 and nylon 12 (glass transition temperature 40 ° C.) pellets at a mass ratio of 80:20. Except for the above, an elevator rope was obtained in the same manner as in Example 1. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there were two peaks in the loss elastic modulus E ″ of the viscoelastic spectrum, and the polyether-based heat which is the first resin component The peak temperature corresponding to the glass transition temperature of the plastic polyurethane elastomer was −30 ° 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-based thermoplastic polyurethane elastomer used in Example 1. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was − The JIS A hardness was 30 ° C. and 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. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was 5 C. and 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-based thermoplastic polyurethane elastomer used in Example 4. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was − The JIS A hardness was 50 ° C. and 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 the nylon 12 used in Example 7. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was 40. C. and JIS A hardness were 100.

(Comparative Example 5)
An elevator rope was obtained in the same manner as in Example 1 except that the mass ratio of the polyether thermoplastic polyurethane elastomer pellets to the polycarbonate thermoplastic polyurethane elastomer pellets was 60:40. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was − The JIS A hardness was 15 ° C. and 95.

(Comparative Example 6)
Polyether thermoplastic polyurethane elastomer used in Example 1, polyester thermoplastic polyurethane elastomer (JIS D hardness 60, obtained by reacting polycaprolactone diol, 4,4′-diphenylmethane 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 pellets having a glass transition temperature of −20 ° C. at a mass ratio of 80:20 was used. When the viscoelastic spectrum and JIS A hardness of the resin coating layer of this elevator rope were measured, there was one peak in the loss elastic modulus E ″ of the viscoelastic spectrum, and the peak temperature corresponding to the glass transition temperature was − The JIS A hardness was 28 ° C. and 97.

The coefficient of friction of the elevator ropes obtained in the above examples and comparative examples was evaluated. For the elevator ropes of Comparative Examples 4 and 5, this evaluation was not performed because the resin coating layer was hard and a rope having flexibility that could be repeatedly bent was not obtained.
The coefficient of friction was evaluated for both a small slip speed and a normal driving slip speed. FIG. 4 shows a system configuration diagram for performing this evaluation. As shown in FIG. 4, the elevator rope 10 obtained in the example and the comparative example was wound 180 degrees around the sheave 11, one end thereof was connected to the weight 12, and the other end was fixed to the ground 13. Then, in order to measure the rope tension (T ₁ ) on the weight 12 side, a load cell 14 was provided in the vicinity of the connecting portion between the elevator rope 10 and the weight 12. Similarly, in order to measure the rope tension (T ₂ ) on the ground 13 side, a load cell 14 is provided in the vicinity of the connecting portion between 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 reduced by the amount of friction force generated between the elevator rope 10 and the sheave 11. A tension difference is generated between the rope 12 and the rope tension (T ₁ ) on the weight 12 side. The rope tension (T ₁ and T ₂ ) at this time was measured by the load cell 14, and the coefficient of friction between the elevator rope 10 and the sheave 11 was determined by substituting it into the following general formula. The rope tension (T ₁ and T ₂ ) is defined as 1 × 10 ⁻⁵ mm / sec for a minute slip speed, 0.01 mm / sec and 1 mm / sec for a normal operation slip speed. The sheave 11 was rotated clockwise at these speeds. The temperature during this measurement was 25 ° C.

In the above formula, θ is a rope winding angle (ie, 180 degrees), and K ₂ is a coefficient (ie, 1.19) determined by the shape of the sheave groove.
With respect to the result of the friction coefficient obtained by the above formula, the friction coefficient when the sliding speed is 1 mm / second is set to 100, and the sliding speed is 0.01 mm / second and 1 × 10 ⁻⁵ mm / second with respect to this friction coefficient. Table 1 shows the results of relative friction coefficient values.

As can be seen from the results in Table 1, the coefficient of friction of the elevator ropes obtained in the examples and comparative examples showed a tendency to decrease as the sliding speed decreased. However, in the elevator rope obtained in the example, the friction coefficient when the sliding speed is 1 × 10 ⁻⁵ mm / second can be maintained at 75% or more of the friction coefficient when the sliding speed is 1 mm / second. There was little variation in the coefficient. On the other hand, in the elevator rope obtained in the comparative example, the friction coefficient when the sliding speed is 1 × 10 ⁻⁵ mm / sec is reduced to 45% or less of the friction coefficient when the sliding speed is 1 mm / sec. The coefficient variation was large.
Further, 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 coefficient of friction decreases, but the polycarbonate-based thermoplastic relative to the polyether-based thermoplastic polyurethane elastomer. When the mass ratio of the polyurethane elastomer is too high, the coating resin layer of the elevator rope becomes too hard, and it becomes impossible to obtain a rope having flexibility that can be bent repeatedly.

As can be seen from the above results, according to the present invention, it is necessary to maintain the stationary state of the car by covering the rope with a resin material having a stable coefficient of friction without depending on temperature and sliding speed. It is possible to provide an elevator rope and an elevator apparatus that can stably brake a car in a wide range of sliding speeds ranging from a minute sliding speed range to a sliding speed during normal operation.

Claims (5)

An elevator rope comprising a rope body and a resin coating layer covering the outer periphery of the rope body,
The resin coating layer includes a first resin component and a second resin component in a mass ratio of 90:10 to 70:30, and has a glass transition temperature between the first resin component and the second resin component. An elevator rope comprising a molded body of a resin composition having a difference of 20 ° C. or more. The elevator rope according to claim 1, wherein the first resin component and the second resin component are thermoplastic polyurethane elastomers using different polyols as raw materials. 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. The elevator rope according to claim 1 or 2, characterized in that. The elevator rope according to claim 1, wherein the first resin component is a polyether-based thermoplastic polyurethane elastomer, and the second resin component is a polyamide resin. An elevator apparatus comprising the elevator rope according to any one of claims 1 to 4.

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