JPWO2019180783A1 - Elevator rope - Google Patents

Abstract

When the bend of the elevator rope is loosened, some core materials may not be displaced. When a load is applied again in the pulling direction to the core material in which the deviation has not returned, the core material is less likely to be loaded. The present invention is characterized by comprising a rope core (2) in which a plurality of core materials are integrated without twisting each other, and a strand arranged on the outer periphery of the rope core.

Description

  This invention relates to elevator ropes.

  In the structure of an elevator rope, a rope core is generally arranged at the center of the elevator rope, and a plurality of steel strands, which are steel strands, are twisted around the outer periphery of the rope core. Rope cores are made of various materials such as steel and fiber, and are formed by twisting the core material. When the rope core is fiber, the core material is a fiber bundle. This fiber bundle is generally made by twisting general fibers such as hemp and synthetic fibers.

The elevator rope is loaded with the weight of the car, the weight of the counterweight, and the weight of the elevator rope itself. In a high-rise building, the elevator car used for the elevator car also has a long length because the car has to travel up and down a long distance. As the length of the elevator rope becomes long, the influence of the weight of the elevator rope itself becomes large. Therefore, the maximum lifting distance of the car is limited by the strength of the rope and the weight of the rope. That is, in order to extend the ascending / descending distance of the car, a lightweight and high-strength rope having a higher mass specific strength (strength / weight per unit length) was required. As a means for obtaining a lightweight and high-strength rope, there is a case where a rope core made of a lightweight synthetic fiber bears a tensile load.

  Further, the elevator rope is generally used under a load that is 10% or less of the breaking strength of the elevator rope. At this time, the elongation of the elevator rope in the tensile direction is less than 1%. It is therefore important that the elevator rope generate higher loads during small elongations, such as less than 1% elongation.

  Since the steel strands of the elevator rope are made of steel, the elevator rope can generate high loads even during small elongations, such as less than 1% elongation in the tensile direction of the elevator rope. However, when the rope core is a fiber, the twisted fiber is likely to expand and contract by the amount of twist, so it is difficult to generate a high load during a small elongation of the rope core of less than 1%. .

  Considering increasing the strength of the entire elevator rope, it is important to bear the load on the rope core. That is, it is important for the rope core to generate a higher load during a small elongation such as less than 1% elongation in the tensile direction. Therefore, in order to further reduce the twist of the rope core of the elevator rope, it is conceivable to bundle the fiber bundle of the core material without twisting to form the rope core. Reference 1 discloses that a plurality of fiber yarns are bundled in parallel as a core material.

No. 10-140490

  When the core material is bundled without being twisted to form a rope core, when the elevator rope is bent, the core materials may be displaced due to a difference in curvature between the inside and the outside of the bending. When the bend of the elevator rope in this state is loosened, some core materials may not be displaced. When a load is applied again in the pulling direction to the core material in which the deviation has not returned, this core material is less likely to be loaded. Since the displaced core material cannot bear the load, the other core material is excessively loaded. As a result, there is a problem that the strength of the elevator rope as a whole decreases.

  In order to solve the above problems, the present invention is characterized by including a rope core in which a plurality of core materials are integrated without twisting each other, and a strand arranged on the outer periphery of the rope core.

  According to the present invention, in an elevator rope having a rope core having a non-twisted core material, there is an effect that it is possible to suppress a decrease in strength due to bending back of the elevator rope.

It is sectional drawing of the elevator rope which has the rope core which bundles a fiber bundle. It is a figure of the rope core which bundles a fiber bundle. It is a figure of the fiber bundle which comprises the rope core which bundles a fiber bundle. It is a conceptual diagram of the elongation and load when a synthetic fiber rope is pulled. It is a figure showing an example of the relation between the elongation and the load at the time of pulling the fiber rope with a different twist shrinkage ratio. FIG. 3 is a cross-sectional view of the elevator rope according to the first embodiment. It is a figure which shows the rope core of Embodiment 1. It is sectional drawing of the elevator rope of Embodiment 2. It is a figure which shows the rope core of Embodiment 2. It is a figure which shows the fiber bundle which comprises the rope core of Embodiment 2. It is sectional drawing of the elevator rope of Embodiment 3. It is a figure showing the performance value of the measured elevator rope of each elevator rope with different conditions. It is a figure which shows an example in case an elevator rope is attached to an elevator.

  Below, the elevator rope which concerns on embodiment of this invention is demonstrated in detail based on drawing. The present invention is not limited to this embodiment.

Embodiment 1.
First, the structure of an elevator rope 1 having a rope core 2 formed by bundling a plurality of fiber bundles 4 which are core materials without twisting will be described. After that, the strength of the elevator rope 1 having the rope core 2 formed by bundling the fiber bundle 4 without twisting will be described, and the characteristics of the present invention will be described.

  FIG. 1 is a sectional view of an elevator rope 1 having a rope core 2 formed by bundling fiber bundles 4 which are core materials. The elevator rope 1 of the first embodiment has a plurality of steel strands 3 (eight in this example) made of twisted wires arranged around the rope core 2 and twisted together. The elevator rope 1 has a structure in which eight steel strands 3 are wound around a rope core 2 and is, for example, 8 × S (19), 8 × W (19), or 8 × Fi defined in JIS G3525. It is the structure of (25). Although the elevator rope 1 of the present embodiment is the steel strand 3, any material may be used as long as it is a strand and the material is not limited.

  FIG. 2 is a diagram showing a rope core 2 formed by bundling fiber bundles 4. FIG. 2 is a sectional view and a perspective view of the rope core 2. The rope core 2 has a configuration in which a plurality of (7 in this example) fiber bundles 4 which are core materials are bundled without twisting. The fiber bundle 4, which is the core material, is made of synthetic fibers. The rope core 2 formed by bundling a plurality of fibers refers to a rope core 2 formed by stacking a plurality of fiber bundles 4 in a substantially parallel manner as shown in FIG. In other words, the rope core 2 is formed by bundling a plurality of fiber bundles 4 so as to be approximately parallel.

  In the present embodiment, the core material is synthetic fiber, but general fiber may be used, and the material of the core material is not limited. The core material may be any if it is fibrous. Since each fiber is too thin in a general elevator rope, it is often the case that a plurality of fibers are twisted together to form a fiber bundle 4 and the rope core 2 is generated from the fiber bundle 4.

  FIG. 3 is a diagram showing a fiber bundle 4 that constitutes the rope core 2. It is the figure which looked at fiber bundle 4 from the slant. It is the figure which expanded one of the seven fiber bundles 4 of FIG. The fiber bundle 4 is made by twisting hundreds to tens of thousands of synthetic fibers having an outer diameter of several μm to several tens μm.

  Here, the configuration in which a plurality of core materials are bundled without being twisted does not require that all the core materials in the fiber bundle 4 which is the twisted core material are bundled without being twisted. For example, it is conceivable that 9 cores out of 10 cores are twisted but only 1 core is not twisted. It is also conceivable that 10 core materials are twisted in pairs of 2 cores to form 5 sets, and the 5 sets are arranged in parallel. The term “without twisting the core material” is a concept that includes not only a state in which all the core materials are not twisted as described above but also a case in which some of the core materials are not twisted, and is not limited.

  Further, the configuration in which a plurality of core materials are bundled without twisting is a concept including a case where the core material itself is not twisted. For example, the core material is formed without twisting the fibers of the core material, and the core materials may be twisted, or the core materials may not be twisted and the core materials may not be twisted. That all the core materials are bundled together without being twisted means that the respective fiber bundles 4 are arranged substantially parallel to the longitudinal direction.

  The fiber material forming the fiber bundle 4 is preferably composed of fibers having high tensile strength and tensile elastic modulus. It is preferable that the tensile strength of the fiber is 20 cN / dtex or more and the tensile elastic modulus is 500 cN / dtex or more. Specifically, one or more of para-aramid fiber, meta-aramid fiber, carbon fiber, polyarylate fiber, and polyparaphenylenebenzoxazole fiber are used. Next, in order to describe the strength of the elevator rope 1 having the rope core 2 in which the fiber bundle 4 is not twisted, the strength of a general elevator rope will be described first.

  As mentioned above, in general, in order to increase the strength of an elevator rope, the rope core needs to generate a larger load with a smaller strain, such as less than 1% strain. For that purpose, it is important to reduce the structural elongation described later. Further, in order to increase the strength of the elevator rope, it is important that all the fibers are evenly pulled so that the load is not biased to a specific fiber bundle of the rope core. That is, it is important to increase the strength utilization rate. Here, the strength utilization factor means a value represented by (actual strength / theoretical strength) × 100, where the theoretical strength is the strength of the used fiber bundle × the number of used fiber bundles.

  Further, by making the rope core lighter and stronger, the mass specific strength of the entire elevator rope can be increased. The rope core may be made of steel, but this tends to increase the strength but increases the mass. Therefore, the rope core 2 is made of a light material such as fiber, and preferably has a higher strength. Since synthetic fibers are assumed as the rope core in the present embodiment, the strength of a general synthetic fiber rope will be described. The synthetic fiber rope described here refers to a twisted synthetic fiber rope.

  FIG. 4 is a diagram showing a conceptual diagram of the relationship between elongation and load when a general synthetic fiber rope is pulled. As shown in FIG. 4, the elongation of the synthetic fiber rope can be divided into structural elongation and material elongation. Structural elongation is something that occurs early in the process of pulling a synthetic fiber rope, and the twisted fibers that make up the synthetic fiber rope are pulled in a state where they are not in a sufficiently close contact with each other, so that the fibers become synthetic fibers. This occurs in the process in which the fibers come into close contact with each other while tightening toward the center of the rope. Therefore, while the structural elongation is occurring, the influence of the material of the fiber does not appear and the load is hardly generated.

  When the fiber is stretched and stretched continuously and the fibers are in a sufficiently close contact, the material stretches. Material elongation is caused by the elongation of the fibers that make up the synthetic fiber rope, and the load begins to increase. That is, by reducing the structural elongation, the synthetic fiber rope can generate a high load with a smaller elongation.

  In order to reduce the structural elongation, it is necessary to reduce the elongation due to the twist, and therefore it is necessary to reduce the twist shrinkage ratio of the fiber. Here, the twist reduction ratio is represented by the value of (Lb-La) / Lb, where La is the length of the twisted fiber and Lb is the length of the untwisted fiber of the length La. It

  FIG. 5 is a diagram showing an example of the relationship between elongation and load when pulling synthetic fiber ropes having different twist shrinkage rates. Generally, an elevator rope is used with an elongation in the tensile direction of less than 1%, so it is important to generate a large load with an elongation of less than 1%. According to FIG. 5, when the twist shrinkage ratio is 15%, the load at the elongation 1% is high, and at the twist shrinkage ratio of 15% or less, the load at the elongation 1% or less is high. On the other hand, when the twist shrinkage ratio is higher than 15%, the load is reduced when the elongation is 1% or less.

  From this, when considering that the load of the elevator rope is to be shared by the rope core of the synthetic fiber rope, it is required that the load becomes high at an elongation of 1% or less, so that the twist reduction ratio of 15% or less is preferable. . In the present embodiment, since each fiber bundle is twisted, when the length of each fiber bundle 4 is Ly, and the length of the fiber obtained by untwisting the fiber bundle 4 having a length of Ly is Lf, (Lf-Ly) / Lf is the twist reduction ratio of the fiber bundle 4. When the length of the rope core 2 bundled without twisting the fiber bundle 4 is Lc, the values of Lc and Ly are the same, so the value of (Lf-Lc) / Lf is (Lf-Ly ) / Lf value is naturally the same.

  That is, in the case of the rope core 2 formed by bundling the fiber bundles 4 without twisting, and when the fiber bundles 4 that are a plurality of core materials are twisted core materials, the twist reduction ratio of each fiber bundle 4 is It can be equated with the twist reduction ratio of the entire rope core 2. The rope core 2 formed by bundling the fiber bundles 4 having a twist reduction ratio of 15% or less without twisting can be regarded as the above-mentioned synthetic fiber rope having a twist reduction ratio of 15% or less. Is 15% or less, an elevator rope with higher strength can be obtained. Further, since the load of the elevator rope can be shared by the lighter rope core 2 such as synthetic fiber, the mass specific strength of the elevator rope can be increased.

  The twist shrinkage rate of the fiber bundle 4 is more preferably 10% or less. When twisted at a twist shrinkage ratio (Lf-Ly) / Lf higher than 15%, the structural elongation becomes large, and the load applied to the elevator rope 1 can hardly be shared by the rope core 2.

  In addition, as described above, in order to increase the strength of the elevator rope 1, it is also important that the strength utilization rate be high. That is, it is ideal that the twist reduction ratio is the same in all the fiber bundles 4. As a result, all the fiber bundles 4 can be pulled uniformly, and the strength utilization rate can be increased. Therefore, when the fiber bundles 4 are bundled without twisting, the twist reduction ratio of each fiber bundle 4 is 15% or less, and by making them equal, the strength of the entire elevator rope 1 can be further increased. . Further, it is generally known that when fibers are twisted together, they become weaker than the original strength of the fibers. By not twisting, the strength can be increased.

  The elevator rope 1 formed by combining the rope core 2 and the steel strand 3 having the above-described structure has 8 × S (19) and 8 × W (19) having the conventional three-strand synthetic fiber rope as the rope core. ) Or 8 × Fi (25) rope has a higher breaking load. The mass specific strength (kN / kg / m) obtained by dividing the breaking load (kN) of the elevator rope by the mass (kg / m) per unit length is 160 kN / kg / m or more, preferably 180 kN / kg / m or more. is there. Next, the features of the present invention will be described. The present invention has the following features.

  FIG. 6 is a sectional view of the elevator rope 5 according to the first embodiment. The elevator rope 5 according to the first embodiment shows a state in which the fiber bundle 4 is fixed and integrated with the resin 9. As shown in FIG. 6, the plurality of fiber bundles 4 serving as core materials are integrated with each other through the resin 9. The elevator rope 5 has a plurality of steel strands 3 (eight in this example) made of twisted wires arranged around the rope core 6 integrated with a resin 9 and twisted together.

  FIG. 7 is a diagram showing the rope core 6 of the first embodiment. FIG. 7 shows a rope core 6 in which the fiber bundles 4 of the elevator rope 1 having the rope core 2 formed by bundling the fiber bundles 4 which are the core materials described in FIGS. FIG. 7 is a sectional view and a side view of the rope core 6. It is different from the elevator rope 1 in that it is fixed and integrated with the resin 9 of the fiber bundle 4. Here, the term “integrated” means that the relative positions in the longitudinal direction of the adjacent fiber bundles 4 do not change irreversibly. As long as the relative positions of the fiber bundles 4 do not change irreversibly, they need not necessarily be fixed and integrated by the resin 9, and the way of integration is not limited. When the resin bundles are integrated with each other through the resin 9, it is preferable that the resin penetrates into the spaces between the fiber bundles 4 and the fiber bundles 4 are integrated with each other through the resin 9, but the invention is not limited thereto.

  When the fiber bundles 4 are integrated with the resin 9, when the elevator rope 5 is bent on the sheave, the relative position in the longitudinal direction between the adjacent fiber bundles 4 temporarily changes reversibly. At this time, the temporary change in the relative position in the longitudinal direction between the adjacent fiber bundles 4 is due to the elastic deformation of the resin 9. Therefore, when the elevator rope passes through the sheave and returns from the bent state to the straight state, the resin 9 recovers from the elastically deformed state, and the relative position of the fiber bundles 4 in the longitudinal direction passes through the sheave. Return to the same position as before.

  The type of the resin 9 is not limited, but a flexible resin having high abrasion resistance such as a thermoplastic resin is preferable. Specifically, it is selected from polyethylene, polypropylene, and polyurethane, but is not limited thereto. The resin 9 covers the outer periphery of the fiber bundle 4 to prevent direct contact between the steel strand 3 and the fiber bundle 4, and also has an effect of suppressing damage to the fiber bundle 4 during use of the elevator rope 5.

  INDUSTRIAL APPLICABILITY The present invention integrates the fiber bundle 4 that is a core material that is bundled without twisting so that the fiber bundles 4 that are core materials are displaced from each other when the elevator rope 5 is bent and then returned to the bending state. It can be suppressed. If the fiber bundles 4 are displaced, the displacement may cause uneven load distribution on some of the fiber bundles 4. Since it becomes impossible for each fiber bundle 4 to evenly disperse and receive the load, the strength of the elevator rope as a whole decreases.

  By integrating the fiber bundles 4 as the core material, even in the mechanism in which the fiber bundles 4 are bundled, it is possible to suppress the decrease in the strength of the elevator ropes 5 due to the displacement between the fiber bundles 4 due to the bending back of the elevator ropes 5. effective. Further, according to the mechanism of the present invention, the rope core 6 can be formed in a state in which the fiber bundle 4 which is the core material is bundled without being twisted. Therefore, a high load is applied to the rope core 6 and the strength of the entire elevator rope is increased. Can be raised. Further, since the rope core 6 is a synthetic fiber, the mass specific strength can be further increased.

  Since the rope core 6 can bear a large load, the ratio of the cross-sectional area of the steel strand 3 to the cross-sectional area of the elevator rope 5 can be reduced, which further reduces the weight of the entire elevator rope 5. The mass specific strength can be improved. Further, by integrating the adjacent fiber bundles 4 with each other, it becomes easy to uniformly pull each fiber bundle 4. As a result, the strength utilization factor of the rope core 6 formed by bundling the fiber bundles 4 can be increased, and the strength of the elevator rope can be further increased.

Embodiment 2.
In the present embodiment, the outer circumference of each of the fiber bundles 4 serving as the core material is covered with the core material coating material 8 made of resin, and the coated core material 12 coated with the core material coating material 8 is bundled. Unlike the first embodiment, the rope core 11 is integrated. Also in this embodiment, the material of the core material is not limited. This embodiment will be described using the fiber bundle 4 as the core material.

  FIG. 8 is a sectional view of the elevator rope 10 according to the second embodiment. The elevator rope 10 of the second embodiment is similar to the first embodiment, and includes a plurality of steel strands 3 (eight in this example) made of twisted wires arranged on the outer periphery of the rope core 11 and the steel strands 3. have. The rope core 11 is covered with the rope core coating material 7. Each of the plurality of fiber bundles 4, which is the core material, is coated with the resin of the core material coating material 8 to form the coated core material 12. As shown in FIG. 8, the coated core materials 12 are integrated with each other through resin.

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FIG. 9 is a diagram showing the rope core 11 according to the second embodiment. FIG. 9 is a sectional view and a side view of the rope core 11. In FIG. 9, the rope core coating material 7 is not shown. In the present embodiment, the outer circumference of the rope core 11 in which the coated core material 12 is bundled and integrated is coated with the rope core coating material 7 made of resin, but the present invention is not limited to this, and the rope core is not limited to this. The coating surrounding 11 is not limited and is not limited.

  The rope core coating material 7 has a role of preventing direct contact between the steel strand 3 and the fiber bundle 4 and suppressing damage to the fiber bundle 4 during use of the elevator rope 10. The rope core covering material 7 is preferably a twisted or knitted synthetic fiber or a resin molded by extrusion molding.

  In the case of synthetic fibers, synthetic fibers having high abrasion resistance are preferable, and examples thereof include para-aramid fibers, meta-aramid fibers, polyarylate fibers, and polyester fibers, but not limited thereto.

  The resin for forming the rope core coating material 7 by extrusion molding is preferably a resin having high abrasion resistance and flexibility, and is selected from, for example, polyethylene, polypropylene and polyurethane, but is not limited thereto. However, a resin molded at a temperature lower than the melting point of the resin used in the fiber bundle 4 is preferable. This is because when a resin molded at a temperature higher than the melting point of the resin used for the fiber bundle 4 is used, the fiber bundle 4 may be melted and damaged by the heat during molding. As the extrusion molding method, the same method as the method of coating a linear object such as an electric wire with a resin can be applied.

  The coating of the rope core may have a double or more structure. For example, the outer circumference of the rope core 11 formed by bundling the fiber bundles 4 may be knitted with synthetic fibers and covered, and the outer circumference may be further covered with resin by extrusion molding. The rope core covering material 7 can prevent direct contact between the fibers of the rope core 11 and the steel strands 3 and suppress damage to the fibers of the rope core 11 during use of the elevator rope.

  FIG. 10 is a diagram showing a coated core material 12 that constitutes the rope core 11 of the second embodiment. FIG. 10 is a sectional view and a side view of the coated core material 12. Each of the coated core materials 12 is coated. The rope core 11 is integrated by bundling the coated core material 12. Here, the integration is not limited to the case where the core material coating materials 8 are fixed and integrated with each other, but also the case where the core material coating materials 8 are integrated by friction between the core material coating materials 8 being bundled. included. The definition of integration is as described in the first embodiment.

  As the core material coating material 8, the same method as the method of coating a linear object such as an electric wire with a thermoplastic resin by extrusion molding can be applied. The resin used for the core material coating material 8 is preferably a resin having high abrasion resistance and flexibility, and is selected from, for example, polyethylene, polypropylene and polyurethane, but is not limited thereto. However, a resin molded at a temperature lower than the melting point of the resin used for the coated core material 12 is preferable. This is because when a resin that is molded at a temperature higher than the melting point of the resin used for the coated core material 12 is used, the fiber bundle 4 may be melted and damaged by the heat during molding.

  In the present embodiment, the resin-coated core material 12 is integrated by bundling, but the manner of integration is not limited. For example, as described above, the coated core materials 12 may not be fixed to each other and may be integrated by frictional force, or the core material coating materials 8 may be fixed and integrated. A material having a high frictional force is suitable for the core material covering material 8. When the core material coating material 8 is made of a thermoplastic resin, the core material coating material 8 can be integrated with higher frictional force.

  As a method of fixing the coated core materials 12 to each other, for example, the coated core materials 12 may be integrated by heat-sealing the resins of the core material coating material 8 of the coated core material 12 respectively. The coated core material 12 is heated to the melting point of the core material coating material 8 or higher than the melting point and to the melting point of the fiber bundle 4 or less, and the core material coating material 8 of the plurality of coated core materials 12 is thermally fused. There is a way to integrate. When the core material coating material 8 is a thermoplastic resin, it is preferable because it can be easily heat-sealed. As a result, it becomes possible to fix the core material coating material 8 of the coated core materials 12 to each other without using an adhesive or the like.

  Further, the resins of the core material coating material 8 of the coating core material 12 may be adhered and integrated with each other by an adhesive. As a method of adhering the core material coating materials 8 of the coated core material 12 to each other, the core material coating materials 8 of the plurality of coated core materials 12 are adhered to each other in a state where an adhesive is applied to the outer periphery of the core material coating material 8. There is a way to integrate them. In the present embodiment, heat fusion and adhesion with an adhesive have been described as the fixing methods, but the method is not limited to this method, and the fixing method is not limited. As another method of fixing, for example, pressure may be applied to the coated core materials 12 so that they are pressed against each other.

  In the present embodiment, the parts different from the first embodiment have been described. Other parts are the same as those in the first embodiment. Generally, as the number of fibers bundled increases, it becomes more difficult to pull all the fibers uniformly, but by bundling and integrating the coated core material 12, it becomes possible to pull the fibers uniformly. As a result, the strength utilization factor of the rope core 11 in which the coated core materials 12 are bundled and integrated can be increased, and the strength of the elevator rope 10 can be increased. By using the fiber bundle 4 as the core material, the mass specific strength can be further increased.

  Further, the core material coating material 8 also prevents direct contact between the steel strand 3 and the fiber bundle 4, so that damage to the fiber bundle 4 can be suppressed. Further, by having the rope core coating, it is possible to further suppress damage to the fiber bundle 4 that occurs during use of the elevator rope 10, and it is possible to extend the life of the elevator rope 10.

Embodiment 3.
The present embodiment differs from the first and second embodiments in that the number of steel strands 16 arranged on the outer circumference of the rope core 11 is 12.

  FIG. 11 is a sectional view of the elevator rope 15 according to the third embodiment. FIG. 11 is a diagram when the rope core 11 of the second embodiment is applied. The rope core 11 according to the second embodiment has a fiber bundle 4 as a core material and a coated core material 12 in which the fiber bundle 4 is coated with a core material coating material 8. The rope core 11 is coated with a rope core coating material 7. It Although the rope core 11 is applied in the present embodiment, the present invention is not limited to this, and any rope core having a higher mass specific strength may be used. The rope cores 2 and 6 described in the first and second embodiments are also included.

  In the elevator rope 15 of the third embodiment, compared with the structure in which the eight steel strands 3 shown in the first and second embodiments are wound, the breaking of the steel strand 16 with respect to the cross-sectional area of the elevator rope 15 is performed. The area ratio is low, and the elevator rope is lightened. Specifically, when eight steel strands 3 are used, the cross-sectional area ratio of the steel strands 3 is 46%, and when 12 steel strands 16 are used, the cross-sectional area ratio is 36%. is there.

  The cross-sectional area of the elevator rope 15 is calculated from the nominal diameter of the elevator rope 15. In the present embodiment, parts different from the first and second embodiments have been described. The other parts are the same as those in the first and second embodiments.

  As described above, the diameter of the rope core 11 can be increased and the shared load of the rope core 11 can be increased even if the elevator ropes have the same diameter because the ratio of the cross-sectional area of the steel strand 16 is reduced. . As a result, the weight of the elevator rope 15 can be reduced without lowering its strength, and the mass specific strength of the elevator rope 15 can be further improved.

  In addition, although the example which used 12 steel strands 16 was shown in Embodiment 3, the ratio of the cross-sectional area of steel strands is further reduced by using 13 or more steel strands, and the rope core 11 It is also possible to further increase the diameter of the elevator rope 15 and further reduce the weight of the elevator rope 15.

  The configurations of the first to third embodiments can be applied to elevator ropes of any outer diameter. Further, the outer diameter of the rope core is appropriately set with respect to the outer diameter of the elevator rope. Further, the number of bundled fiber bundles and the number of fibers included in the fiber bundle are also appropriately set according to the set outer diameter of the rope core. Furthermore, the strand structure of each steel strand is not particularly limited.

  Furthermore, the steel product of the present invention can be applied not only to the main rope that suspends the car and the suspension weight, but also to the compensator rope that is suspended from the car and the suspension weight. Next, effects of the first to third embodiments will be described based on comparison of measurement results of elevator ropes of different types.

  FIG. 12: is a figure showing the performance value for each rope kind of measured elevator rope of each elevator rope with different conditions. Here, the performance values are mass per unit length (kg / m), load at 0.5% elongation (kN), breaking load (kN), mass specific strength (kN / kg / m), bending fatigue test. High altitude residual rate (%). First, the rope types 1 to 4, the fiber core rope, and the steel core rope of FIG. 12 will be described in detail.

  The rope 1 is a rope formed by twisting 28 Vectran HT (manufactured by Kuraray Co., Ltd.) 1670 dtex (300 fibers configuration), which is a polyarylate fiber, into a fiber bundle. The twist contraction rate (Lf-Ly) / Lf of this fiber bundle is 9%. The seven fiber bundles thus prepared were arranged in the longitudinal direction without twisting to prepare a rope core having an outer diameter of about 7 mm.

  Eight ropes made of steel were wound around the outer circumference of the rope core while a load of 50 kgf was applied to the rope core, and an 8 × S (19) elevator rope having an outer diameter of 12 mm was produced as the rope 1. In this way, the rope 1 is an elevator rope in which the fiber core is bundled without being twisted to form a rope core.

  The rope 2 is a rope formed by twisting 21 strands of Vectran HT (manufactured by Kuraray Co., Ltd.) 1670 dtex (construction of 300 fibers), which is a polyarylate fiber, into a fiber bundle. The twist contraction rate (Lf-Ly) / Lf of this fiber bundle is 9%. The produced 7 fiber bundles were arranged in the longitudinal direction without twisting, and the outer periphery was covered with a polyethylene resin Novatec HB530 (manufactured by Nippon Polyethylene Co., Ltd.) by extrusion molding to produce a rope core having an outer diameter of about 7 mm.

  Eight ropes made of steel were wound around the outer circumference of the rope core while a load of 50 kgf was applied to the rope core, and an 8 × S (19) elevator rope having an outer diameter of 12 mm was produced as the rope 2. The rope 2 is thus an elevator rope in which the fiber bundle is not twisted but bundled as a rope core, and the rope core is further covered with a resin.

  The rope 3 is a rope formed by twisting 21 strands of Vectran HT (manufactured by Kuraray Co., Ltd.) 1670 dtex (construction of 300 fibers), which is a polyarylate fiber, into a fiber bundle. The twist contraction rate (Lf-Ly) / Lf of this fiber bundle is 9%. The outer periphery of the produced fiber bundle was covered with polyethylene resin Novatec HB530 (manufactured by Nippon Polyethylene Co., Ltd.) by extrusion molding. Seven coated fiber bundles were arranged in the longitudinal direction without being twisted, adhered under pressure at 150 ° C., and then cooled to prepare a rope core having an outer diameter of about 7 mm.

  Eight ropes made of steel were wound around the outer circumference of the rope core while a load of 50 kgf was applied to the rope core, and an 8 × S (19) elevator rope having an outer diameter of 12 mm was manufactured as the rope 3. The rope 3 is thus an elevator rope that is a rope core that covers and bundles each of the fiber bundles to form an integrated rope core.

  The rope 4 is a rope formed by twisting 28 pieces of Vectran HT (manufactured by Kuraray Co., Ltd.) 1670 dtex (composition of 300 fibers), which is a polyarylate fiber, into a fiber bundle. The twist contraction rate (Lf-Ly) / Lf of this fiber bundle is 9%. The outer periphery of the produced fiber bundle was covered with polyethylene resin Novatec HB530 (manufactured by Nippon Polyethylene Co., Ltd.) by extrusion molding. Seven coated fiber bundles were arranged in the longitudinal direction without being twisted, adhered under pressure at 150 ° C., and then cooled to prepare a rope core having an outer diameter of about 8 mm.

  Twelve steel strands were wound around the outer circumference of the rope core while a load of 50 kgf was applied to the rope core, and a 12 × S (19) elevator rope having an outer diameter of 12 mm was manufactured as the rope 4. In this way, the rope 4 increases the number of the strands of the rope core integrated by covering and bundling each of the fiber bundles to 12 to reduce the total cross-sectional area of the steel strands, and to increase the outside of the elevator rope. If the diameters are the same, there is room to increase the outer diameter of the rope core, so the elevator rope has the outer diameter of the rope core increased from 7 mm to 8 mm.

  The fiber core rope is an 8 × S (19) elevator rope with an outer diameter of 12 mm, which uses a triple-strand hemp fiber rope for the rope core, and 8 steel strands are wound around the rope core with an outer diameter of about 7 mm. is there. This elevator rope is generally used.

  A steel core rope is a general elevator with an 8 × S (19) rope core having a steel core and an outer diameter of 12 mm wound with eight IWRC (Independent Went Rope Core) steel strands. It is a rope.

  The measured values of the respective performance values of the ropes 1 to 4, the fiber core rope, and the steel core rope are compared. The fiber core rope is a common conventional elevator rope and the steel core rope is a common IWRC rope. It can be seen that the ropes 1 to 4 of the present invention have higher mass specific strength than these.

  When the fiber core ropes and the ropes 1 to 3 are compared, the ropes 1 to 4 are stretched by 0.5 although the outer diameter of the rope core, the number of steel strands, and the outer diameter of the elevator rope are the same. % Load is high. From this, it can be seen that the rope core formed by bundling the fiber bundles without twisting, like the ropes 1 to 3, has an elongation of 0.5%, which means that the load can be shared at the beginning of elongation of the elevator rope.

  When the rope 1 and the rope 2 are compared, the breaking load of the rope 1 is higher. This is because the rope 2 has the same outer diameter of the rope core as the rope 1, and the amount of polyarylate fibers used in the fiber bundle is reduced from 28 of the rope 1 to 21 in order to provide the rope core coating. It is presumed that the cause is. On the other hand, the strength residual rate after the bending fatigue test is higher in the rope 2. It is presumed that this is because the rope core coating is provided to prevent damage to the fiber in the bending fatigue test.

  When comparing the ropes 2 and 3, the breaking load of the rope 3 is higher. The difference between the rope 2 and the rope 3 is whether the outer circumference of the rope core is coated with resin or whether each fiber bundle is coated with resin to be integrated. It can be seen that the breaking load becomes higher when the respective fiber bundles are coated with a resin and integrated.

  It is presumed that this is because by coating each fiber bundle with a resin, all the fiber bundles were pulled evenly, and the strength utilization factor of the fibers contained in the rope core could be increased. The fact that all the fiber bundles can be pulled evenly means that there is no deviation between the fiber bundles. Further, the difference in weight between the rope 2 and the rope 3 is not large, and therefore the mass specific strength is also greatly increased.

  When the rope 3 and the rope 4 are compared, the breaking load of the rope 3 is higher. It is estimated that this is because the total cross-sectional area of the eight steel strands of the rope 3 is larger than the total cross-sectional area of the 12 steel strands of the rope 4.

  Since the mass per unit length is smaller as the total cross-sectional area of the steel strands is smaller, the mass specific strength of the rope 4 is higher than that of the rope 3. The outer diameter of the rope core of the rope 4 is larger, and the cross-sectional area of the rope core of the rope 4 is larger than the cross-sectional area of the rope core of the rope 3, but the rope core is made of light synthetic fiber. The mass specific strength of the rope 4 becomes higher.

  It can be seen that it is effective to reduce the steel strand cross-sectional area and thicken the rope core in the case of increasing the mass specific strength even if the breaking load is somewhat reduced with the same elevator rope outer diameter.

  FIG. 13: is a figure which shows an example in case the elevator rope 5 of this invention is attached to an elevator. In FIG. 13, the elevator rope 5 is connected to a general elevator cage 17. When the elevator cage 17 moves up and down, the elevator rope 5 is pulled through the sheave 18. As the elevator rope passes the sheep 18, the elevator rope 5 is bent, and after passing, the bend returns.

  FIG. 13 is an example, and how the elevator ropes 5 are connected is not limited. The method of connecting the elevator rope 5 is not limited as long as it is directly and indirectly connected to the basket 17 and can raise and lower the basket 17. Although the elevator rope 5 of the first embodiment is shown in FIG. 13, the invention is not limited to this, and the elevator ropes 10 and 15 described in the second and third embodiments may be used.

  1, 5, 10, 15: elevator rope, 2, 6, 11: rope core, 3, 12, 16: steel strand, 4: fiber bundle, 9: resin, 8: core material coating material, 12: coated core Material

In order to solve the above problems, the present invention comprises a rope core integrated without twisting a plurality of core materials, and a strand arranged on the outer periphery of the rope core, wherein the rope core is each of the outer periphery of the plurality of core material is covered with a resin becomes coated core, wherein the coating core material to each other, characterized in Rukoto are integrated via the resin.

In order to solve the above problems, the present invention comprises a rope core integrated without twisting a plurality of core materials, and a strand arranged on the outer periphery of the rope core, wherein the rope core is Only the outer circumference of each of the plurality of core materials is coated with a resin to form a coated core material, and the coated core materials are integrated with each other through the resin.

Claims (8)

A rope core that integrates multiple core materials without twisting each other,
A strand arranged on the outer periphery of the rope core,
An elevator rope, comprising: The elevator rope according to claim 1, wherein each of the plurality of core materials is integrated with the rope core via a resin. The elevator core according to claim 1, wherein the rope core is a coated core material in which each of the plurality of core materials is coated with a resin, and the coated core materials are integrated with each other through the resin. rope. The elevator rope according to claim 3, wherein the rope core is integrated by bonding the resins of the coated core material to each other. The elevator rope according to claim 3, wherein the rope core is integrated by heat-sealing the resins of the coated core material. The elevator rope according to any one of claims 1 to 5, wherein each of the plurality of core materials is a twisted core material. The strand is a steel strand that is made of steel,
The elevator rope according to claim 6, wherein the twist reduction ratio of the rope core is 15% or less. The strand is a steel strand that is made of steel,
The elevator rope according to claim 6, wherein the twist reduction ratios of the plurality of core materials are equal to or less than 15%.

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