JP5768568B2 - Elevator hoisting rope - Google Patents

Description

  The present invention relates to an elevator hoisting rope having high fatigue resistance and capable of stabilizing the shape over time.

  As shown in FIG. 1, the elevator hoisting rope 1 is wound around a driving sheave 2 connected to a driving electric motor, and an elevator car 3 on which a passenger rides is suspended from one end of the hoisting rope 1. A counterweight 4 is suspended from the other end of the hoisting rope 1. Then, the car 3 and the counterweight 4 suspended at both ends of the hoisting rope 1 are moved up and down in the hoistway by the rotation of the driving sheave 2. Moreover, the hoisting rope 1 for elevators is comprised from the core rope 11 which consists of a center fiber bundle, and the steel rope 12 which twisted the steel wire arrange | positioned on the outer periphery of this core rope 11. As shown in FIG.

  The configuration of the conventional elevator hoisting rope 1 is usually an 8 × S (19) component defined in JIS G 3525, and is made of natural sisal fiber or synthetic polypropylene fiber as a central core material. A core rope 11 is used. As shown in FIGS. 9 and 10, the core rope 11 has a configuration in which three core ropes 112 obtained by twisting a large number of yarns 111 bundled with natural sisal fibers or synthetic polypropylene fibers are twisted, that is, This is a trivial “three-stroke” configuration, and is compressed and shaped from the outer periphery when twisted together with the eight steel strands 12 composed of steel wires 121 arranged on the outer periphery of the core rope 11. It becomes a high-density core material. Since the core rope 11 has a high density, the steel rope 12 composed of the steel wire 121 on the outer periphery can maintain the shape as a rope, and becomes a long-life hoisting rope. Further, the configuration of the core rope 11 does not change even when the diameter of the rope increases, and only the number and diameter of the yarns increase with the increase in the diameter of the rope, and the number of core ropes 112 is three. .

  A conventional method for manufacturing an elevator hoisting rope will be described. First, natural sisal fiber or synthetic polypropylene fiber is bundled and twisted to produce the yarn 111. Next, a plurality of yarns 111 are twisted together to produce a core rope cord 112. Then, three core ropes 112 are twisted to produce the core rope 11 (see FIG. 9). Next, eight steel strands 12 in which steel wires 121 are twisted around the outer circumference of the core rope 11 are twisted to produce the hoisting rope 1 (see FIG. 10). At this time, the steel rope 12 is pressed to compress and shape the core rope 11 as shown in FIG. The three core ropes 112 are in a state where the apex portion in contact with the steel rope 12 is most strongly pressed, and the density increases with the compression shaping (deformation), and the core rope 11 becomes a tightly tightened rope.

  Further, as a conventional technique, a core rope composed of a fiber bundle in a core rope composed of a central fiber bundle, and a steel rope formed by twisting steel wires arranged on the outer periphery of the core rope. Is manufactured by twisting fiber bundles and arranged as a core body in the center of the core rope, and 4 or 6 arranged on the outer periphery of the core rope and serving as the outer periphery of the core rope An elevator hoisting rope composed of a core rope rope is proposed (for example, see Patent Document 1).

JP 2009-292630 A

In the conventional hoisting rope for elevators, the core rope 11 has a coreless configuration in which three core ropes 112 are twisted together, and therefore is twisted together with eight steel ropes 12 constituted by steel wires 121. In this case, since it is compressed and deformed from a place where it is easily deformed, the finished density of the core rope 11 varies, and a strong place and a weak place are created. The peak portion of the core rope 11 having the greatest deformation is deformed and increased in density as the pressing force is increased. However, if the deformation is too large, the fibers of the core rope 11 are cut and the density is not increased. There is a problem that is likely to become unstable. Also, as the rope diameter increases, the diameter of the core rope increases, so it is desirable to increase the density. However, the density of the core rope is limited and cannot be increased without darkness. In addition, if the core rope is pressed too hard to increase the density, the core rope will quickly wear out, the steel strands will come into contact with each other, and the surface of the rope will be damaged and the strength and life will be lost. In addition, when a hoisting load or bending by a driving sheave is applied to the hoisting rope, the larger the rope diameter, the greater the force of the steel strands arranged on the outer periphery to tighten the core leash, causing sag at the contact area. Or the core rope becomes thin due to wear. In addition, the density of the core rope is made at the maximum density regardless of the diameter of the rope, but the spring constant decreases (in inverse proportion to the rope diameter) as the diameter increases, and the diameter change during loading increases, making it steel. The gap between the strands becomes small, the steel strands come into contact with each other at an early stage, and wear and disconnection are likely to occur, resulting in a short life. These have recently become a problem.
From the above, in the conventional elevator hoisting rope, the core rope with three core ropes has a limit of a rope diameter of 12 mm or less and cannot be applied at a diameter larger than this.

  In order to solve the above problems, the inventor has proposed Patent Document 1 in which the number of core ropes constituting the core rope is increased from three to seven. It was found that when the number of the wires is 7, the strength of the one wire is reduced, so that the strength is lowered and it is easy to cut, and the fiber is broken and deformed due to bending by repeated bending, thereby reducing the life of the rope. In particular, natural hemp fibers are brittle and easy to cut, so they are not suitable for thin core ropes. In addition, it was found that the spun fiber of synthetic fiber used in anticipation of a high oil content is not suitable because it is thin and easily cut and powdered due to slight abrasion and easily loses its shape.

  The present invention has been made to solve the above-described problems. By using a core rope having both hardness and density, and further retaining performance of lubricating oil, it is not deformed and is used for a long-life elevator. A hoisting rope is provided.

The elevator hoisting rope according to the present invention is a rope in which an elevator car on which a passenger rides is suspended at one end and a counterweight is suspended at the other end. A plurality of core ropes constituting the core rope, wherein the core rope comprises a core rope made of fiber bundles and a steel rope arranged by twisting steel wires arranged on the outer periphery of the core rope. was composed of synthetic resin fibers of two layers, inside the inner layer of those natural hemp fibers and equally able to hold the lubricating oil Cie over preparative shaped synthetic resin slitting fiberization of each core Tsunago rope place the system slave ropes, those on the outer periphery of the core Tsunago rope that thread the thick stone over preparative shaped synthetic resin than the inner layer to the paper string shape disposed as the outer layer system Konawa, the entire outer periphery of the core rope An outer layer synthetic resin coating is applied, and the entire outer periphery is coated with an outer layer synthetic resin coating. It is obtained by placing the steel the strands combined twisted steel wires on the outer periphery of the core rope.

In addition, the outer layer synthetic resin coating is applied to each outer periphery of a plurality of core ropes constituting the core rope, and the steel strands obtained by twisting steel wires on the outer periphery of the core ropes individually coated with the outer layer synthetic resin coating It is arranged .

Moreover, in which melting point than the outer layer synthetic resin coating constituted the core rope of a synthetic resin material high stone over preparative form.

Further, the outer layer synthetic resin coated with polyethylene resin, a sheet over preparative shaped core rope construction material which is constituted by a polyester material.

  Further, a soft solid lubricating oil having a dropping point higher than the melting point of the outer layer synthetic resin coating is applied.

Moreover, the melting temperature of the synthetic resin fibers constituting the core rope is higher than the dropping point of the soft solid lubricating oil to be applied.

According to the present invention, constitute plural core Tsunago rope constituting the Shintsuna synthetic resin fibers of two layers, the inside of each core Tsunago rope can hold natural hemp fibers and equally lubricant cie over bets shaped synthetic resin slitting place those fibers as an inner layer based Konawa were filamentous the thick stone over preparative shaped synthetic resin than the inner layer to the paper string shape on the outer periphery of the core Tsunago rope Since the outer layer of the core rope is arranged and the outer circumference of the core rope is covered with an outer layer synthetic resin coating, it retains the lubricating oil over time and becomes a core rope that does not easily lose its shape, thus prolonging the long life of the rope itself. There is an effect that can be realized.

It is a block diagram which shows notionally the whole structure of an elevator. It is a block diagram which shows the structure of the core rope of the hoisting rope for elevators proposed previously. It is sectional drawing of the hoisting rope completed by twisting a steel strand to the outer periphery of the core rope of the hoisting rope for elevators proposed previously. It is sectional drawing which shows the structure of the core rope of the hoisting rope for elevators in Example 1 of this invention. It is sectional drawing which shows the structure of the core rope of the hoisting rope for elevators in Example 2 of this invention. It is sectional drawing of the hoisting rope completed by twisting a steel strand to the outer periphery of the core rope of the hoisting rope for elevators in Example 2 of this invention. It is sectional drawing which shows the structure of the core rope of the hoisting rope for elevators in Example 3 of this invention. It is sectional drawing of the hoisting rope completed by twisting a steel strand to the outer periphery of the core rope of the hoisting rope for elevators in Example 3 of this invention. It is sectional drawing which shows the structure of the core rope of the conventional hoisting rope for elevators. It is sectional drawing of the hoisting rope completed by twisting a steel strand on the outer periphery of the core rope of the conventional hoisting rope for elevators.

Before describing the elevator hoisting rope of the present invention, the elevator hoisting rope previously proposed will be described. FIG. 2 is a block diagram showing the structure of the previously proposed elevator hoisting rope core rope, and FIG. 3 is completed by twisting a steel strand around the outer circumference of the previously proposed elevator hoisting rope core rope. It is sectional drawing of a hoisting rope.
The structure of the core rope 11 of the elevator hoisting rope 1 proposed earlier is, as shown in FIG. 2, a single core obtained by twisting a large number of yarns 111 bundled with natural sisal fibers or synthetic polypropylene fibers. In this configuration, the lasso 113 is arranged in the center, and the 6 core ropes 112 are in contact with each other on the outer periphery of the lasso 113 so as to reduce the gap between the lassos. That is, the core rope 11 is formed by twisting a large number of yarns 111 in which natural sisal fibers and synthetic polypropylene fibers are bundled around the outer periphery of a single core rope 113 arranged in the center. 12 cores are twisted together, one core rope 113 is arranged at the center of the core rope 11, and six core ropes 112 are arranged around the core rope 113 around each other. When twisted together with eight steel strands 12 composed of steel wires 121, as shown in FIG. In addition, the six core ropes 112 are compressed and deformed almost uniformly and deformed.

  However, as described above, in the elevator hoisting rope proposed previously, according to the evaluation by various tests, by reducing the number of core ropes to seven, one becomes thin and the strength decreases. In addition to being easy to do, the fiber is broken and loses its shape due to repeated bending, and the life of the rope is reduced. In particular, natural hemp fibers are brittle and easy to cut, so they are not suitable for thin core ropes. Further, the synthetic spun fiber used in anticipation of a high oil content is not suitable because it is thin and easily cut or powdered due to slight abrasion and easily loses its shape.

FIG. 1 is a block diagram conceptually showing the overall configuration of the elevator, and FIG. 4 is a cross-sectional view showing the structure of a core rope of a hoisting rope for an elevator according to Embodiment 1 of the present invention.
As shown in FIG. 1, the elevator hoisting rope 1 is wound around a driving sheave 2 connected to a driving motor, and an elevator car 3 on which a passenger rides is suspended at one end of the hoisting rope 1. A counterweight 4 is suspended from the other end of the hoisting rope 1. Then, the car 3 and the counterweight 4 suspended from both ends of the hoisting rope 1 are moved up and down in the hoistway by the rotation of the driving sheave 2. Moreover, the hoisting rope 1 for elevators is comprised from the core rope 11 which consists of a center fiber bundle, and the steel rope 12 which twisted the steel wire arrange | positioned on the outer periphery of this core rope 11. As shown in FIG.

The core rope made of spun fibers, which is used with the expectation of high oil content, is composed of a plurality of twisted yarns of very thin (cotton yarn of about 1000 denier). It has excellent characteristics, but the fibers are rubbed and worn due to expansion and contraction caused by fluctuations in the tension of the rope and the bending action of the sheave. This wear is not extremely high, but in the case of a thin spun fiber, even a slight wear causes the fiber to break, leading to a loss of shape of the core rope itself.
Therefore, in Example 1 of the present invention, the core rope of the elevator hoisting rope is made of thick fibers in order to increase the allowable wear amount of each fiber. However, since the property of retaining the lubricating oil is impaired when the thickness is simply increased, the core rope is composed of two layers of fibers. The structure of the core rope of the hoisting rope for elevators according to Embodiment 1 of the present invention is shown in FIG. In FIG. 4, a plurality (seven in the drawing) of the core rope 11 constituting the core rope 11 is arranged and configured as a plurality of layers composed of an inner layer-type rope 1141 and an outer layer-type rope 1141. In each core rope 114, a fiber made of about 4000 denier slitted into a sheet-like synthetic resin capable of holding lubricating oil in the same manner as natural hemp fiber is arranged as an inner layer rope 1121. In addition, on the outer periphery of each core rope 114, a sheet-like synthetic resin threaded into a paper web of about 8000 denier is arranged as an outer layer rope 1142, and the lubricating oil retention performance and the shape of the core rope are provided. The core rope 11 is designed to be hardened for stabilization. And although not shown in figure, when it is twisted with the eight steel strands 12 comprised with the steel wire 121 arrange | positioned on the outer periphery of the core rope 11, it is compression shaping from an outer periphery similarly to the case of FIG. It becomes a high-density core material. Thereby, it becomes a core rope which retains lubricating oil over time and is not easily deformed, and can realize the long life of the rope itself.

  FIG. 5 is a cross-sectional view showing the structure of an elevator hoist rope core rope according to Embodiment 2 of the present invention, and FIG. 6 shows a steel rope on the outer periphery of the elevator hoist rope core rope according to Embodiment 2 of the present invention. It is sectional drawing of the hoisting rope completed by twisting together.

In the said Example 1, since the inner layer type | system | group strand 1141 and the outer layer type | system | group strand 1122 of the core rope 11 are comprised only with the fiber, there exists a limit in the implementable hardness. Therefore, in Example 2 of this invention, as shown in FIG. 5, the outer layer synthetic resin coating 13 is given to the whole outer periphery of the core rope 11 formed by twisting fibers impregnated with lubricating oil. The outer layer synthetic resin coating 13 can be freely selected and set in material and hardness according to the diameter and configuration of the rope, but polyethylene resin is suitable in view of characteristics, price, and workability. And as shown in FIG. 6, the core rope 11 by which the outer periphery synthetic resin coating 13 was given to the whole outer periphery is twisted with the eight steel strands 12 comprised with the steel wire 121 arrange | positioned on the outer periphery. When they are combined, they are compressed and shaped from the outer periphery to become a high-density core material.
In such a configuration, the entire outer circumference of the core rope is configured by the outer layer synthetic resin coating 13. Although it is conceivable that the core rope itself is made of a rod-shaped resin, the core rope made of a rod-shaped resin has a problem that the bending rigidity becomes too high and the rope becomes inflexible, so the fiber layer and the resin film Multiple configurations of layers are preferred.

  FIG. 7 is a cross-sectional view showing the structure of an elevator hoist rope core rope according to Embodiment 3 of the present invention, and FIG. 8 shows a steel rope on the outer periphery of the elevator hoist rope core rope according to Embodiment 3 of the present invention. It is sectional drawing of the hoisting rope completed by twisting together.

In Example 2 described above, the outer layer synthetic resin coating 13 is applied to the entire outer periphery of the core rope 11 formed by twisting the fibers impregnated with the lubricating oil. However, when the outer layer synthetic resin coating 13 is applied to the entire outer periphery of the core rope 11, The bending stiffness of the entire rope is increased. Therefore, in Example 3, as shown in FIG. 7, the outer layer synthetic resin coating 13 is individually applied to the entire outer periphery of each of the seven core ropes 114 of the core rope 11. The material and hardness of the individual outer layer synthetic resin coating 13 can be freely selected and set according to the diameter and configuration of the rope, but polyethylene resin is suitable in terms of characteristics, price, and workability. And as shown in FIG. 8, the core rope 11 which gave the outer-layer synthetic resin coating 13 to the whole outer periphery for every seven core ropes 114 is comprised with the steel wire 121 arrange | positioned on the outer periphery. In addition, when twisted with the eight steel strands 12, the core is compressed and shaped from the outer periphery.
With this configuration, a flexible rope can be provided because it bends easily by sliding between the lassos when subjected to bending at the sheave. Moreover, since the outer layer synthetic resin coating 13 is interposed between the strands and the strands are in contact with each other, the hardness and density of the entire core rope is increased, and it is possible to realize a rope that is not easily deformed, thereby extending the life of the rope. I can expect.

  The outer layer synthetic resin coating 13 is preferably coated with a polyethylene resin from the viewpoint of wear resistance and cost, but in molding using an extruder, the resin temperature is, for example, about 200 ° C. If a polypropylene fiber core having a melting point of around 140 ° C. is coated at this temperature, the fibers may be melted and integrated, and the core rope 11 may be hardened into a rod shape. Therefore, in Example 4, the core rope is made of a high fiber or sheet-like material having a melting point of at least the melting point of the outer layer synthetic resin coating 13, preferably the molding temperature of the outer layer synthetic resin coating 13 (eg, 200 ° C.). Is configured.

  For example, when the outer layer synthetic resin coating 13 is coated with a polyethylene resin having a melting point of around 130 ° C., the core rope fiber material is preferably a polyester fiber or sheet having a melting point of around 260 ° C.

  To construct the outer layer synthetic resin coating 13, the molten resin is molded by an extruder. At this time, the resin temperature exceeds, for example, 150 ° C. There is a problem of mixing with resin. Therefore, in Example 6, a core rope coated with a lubricating oil having a melting point of at least the melting point of the outer layer synthetic resin coating 13, preferably the molding temperature of the outer layer synthetic resin coating 13 (for example, 150 ° C.) is used. is there. The soft solid lubricating oil is preferably a drip point type or a non-soap base type high temperature grease such as urea-based or bennite.

  The core rope 11 is impregnated and coated with a soft solid lubricating oil at the stage of a thread or a rope, but since it cannot be impregnated with a soft solid, it needs to be heated before being applied in a liquid state. The heating temperature is 10 to 20 ° C. higher than the dropping point of the soft solid lubricating oil (temperature at which the grease or the like becomes liquid). In addition to being lost, there is a problem that the performance of retaining the lubricating oil in the solid core rope is lost, and the aged rope life is impaired. Therefore, in Example 7, polypropylene fiber may be used if the temperature of the lubricating oil used in the general environment is 100 ° C. or less, but the lubricating oil used in the environment where the installed ambient temperature is high may be used. If the temperature to be heated is 100 to 150 ° C., nylon or polyester fiber is suitable. If the core rope is composed of fibers having a high melting and softening temperature, a high oil content can be secured without impairing the flexibility of the core rope, and the stable characteristics of the rope can be maintained for a long time.

DESCRIPTION OF SYMBOLS 1 Hoisting rope for elevators 2 Drive sheave 3 Elevator car 4 Balance weight 11 Core rope 111 Yarn
112 core rope
113 core rope
DESCRIPTION OF SYMBOLS 12 Steel lasso 121 Steel wire 114 Core rope lasso 1141 Inner layer type lasso 1142 Outer layer type lasso 13 Outer layer synthetic resin coating

Claims (6)

A rope that is wound around a driving sheave connected to a driving motor, an elevator car on which a passenger rides is suspended at one end, and a counterweight that is suspended at the other end. In the hoisting rope for elevators composed of a steel strand that twists steel wires arranged on the outer periphery of the core rope,
Plural core composed of synthetic resin fibers of Tsunago rope two layers, the inside of each core Tsunago rope can hold natural hemp fibers and equally lubricant Resid over preparative shaped synthetic resin constituting the core rope slitting to a material obtained by fiberizing arranged as an inner layer based Konawa, each core Tsunago rope outer layer obtained by filamentous the thick stone over preparative shaped synthetic resin than the inner layer to the paper string shape on the outer periphery of the system slave to Arranged as a rope, the outer circumference synthetic resin coating is applied to the entire outer circumference of the core rope, and the steel cord rope obtained by twisting the steel wire on the outer circumference of the core rope, the outer circumference synthetic resin coating being applied to the entire outer circumference. A hoisting rope for an elevator characterized by being arranged . A rope that is wound around a driving sheave connected to a driving motor, an elevator car on which a passenger rides is suspended at one end, and a counterweight that is suspended at the other end. In the hoisting rope for elevators composed of a steel strand that twists steel wires arranged on the outer periphery of the core rope,
A plurality of core ropes constituting the core rope are made of two layers of synthetic resin fibers, and each core rope is slit into a sheet-like synthetic resin that can hold lubricating oil equivalent to natural hemp fibers. The fiberized one is arranged as an inner layer system rope, and the outer circumference of each core rope is arranged as an outer layer system cord with a sheet-like synthetic resin thicker than the inner layer threaded in the shape of a paper web, The steel lasso comprising an outer layer synthetic resin coating on each outer circumference of a plurality of core ropes constituting the core rope, and the steel wires twisted around the outer circumference of the core rope that has been individually coated with an outer layer synthetic resin coating features and to Rue elevators for hoisting ropes in that a. Claim 1 or claim 2 elevator hoisting rope, wherein the melting point constituted the core rope of a synthetic resin material high stone over preparative shape than the outer layer synthetic resin coating. The outer synthetic resin coated with polyethylene resin, shea over preparative form of claim 3 elevator hoisting ropes according to the core rope construction materials, characterized in that configured in the polyester material. The hoisting rope for an elevator according to claim 1 or 2, wherein a soft solid lubricating oil having a dropping point higher than the melting point of the outer layer synthetic resin coating is applied. The hoisting rope for an elevator according to claim 1 or 2, wherein a melting temperature of the synthetic resin fiber constituting the core rope is higher than a dropping point of the soft solid lubricating oil to be applied.

Images