JP2002060163A - Fiber rope for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have superior strength, flexibility and bending fatigue resistance by appropriately balancing the elongation percentages of a core strand and side strands and uniformalizing the stress distribution in a rope section. SOLUTION: This fiber rope R formed by winding and stranding a plurality of side strands 2 around the circumferential face of the single core strand 1 is so constituted that the fracture elongation percentage of a synthetic fiber constituting the core strand 1 is larger than the fracture elongation percentage of a synthetic resin fiber constituting the side strands 2 by 20-100%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber rope used in a rope elevator in which a car on which a person or luggage is placed is hung by a rope, and the rope is driven to move the car up and down.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 9, a hoisting rope for an elevator has one end of a hoisting rope 11 connected to a cage 12 and the other end connected to a weight 13, so that the hoisting rope can be operated at high speed. For this reason, tension is always applied, and it moves at high speed and is repeatedly bent by the drive sheave 14 and the guide sheave 15. In addition, since a person is placed on the basket to ascend and descend, high security is of course required. For this reason, a parallel twisted wire rope is currently used as a rope that can be used for a long period even under tension and high-frequency repeated bending.

However, since the wire rope has a heavy weight and lacks flexibility in bending, the total weight of the basket 12 and the rope 11 and the like increases, and the required strength of a hoist and the like also increases. In addition, there is a problem that the diameter of the auxiliary equipment such as the drive sheave 14 and the guide sheave 15 where the wire rope is bent becomes large and large, and the equipment cost and the construction cost increase.

[0004] In order to solve such problems,
It is a synthetic fiber, but has a strength comparable to a wire rope.For example, a rope made using high-strength low-stretch fiber represented by aramid fiber is known, but other fibers constituting the rope are known. Because of the difference in the tensile properties from the wire rope, the overall performance did not reach that of the wire rope.

Therefore, a high-strength low elongation fiber having a breaking strength of 20 g / d or more and an elastic coefficient of 500 g / d or more as described in Japanese Utility Model Laid-Open Publication No. 11-293574 is used, and the twist coefficient K _{0 of the} core strand is used. And twist coefficient K _{1 of the} side strand
A high-strength fiber rope in which the ratio K ₀ / K ₁ of 1 <K ₀ / K ₁ ≦ 5.76 has been proposed.

[0006]

However, this high-strength fiber rope is intended to increase the elongation by increasing the number of twists of the core strand as described above, but the core strand is also formed with the core part and the side. Since the core fiber was nearly parallel to the axial direction of the core strand, the increase in elongation was insufficient even if the number of twists was reduced.

[0007] In addition, when twisting for elongation,
Since the unevenness of the stress distribution increases and the strength of the core strand decreases, the strength of the rope is still slightly improved even if the balance of elongation is improved. There was a problem that it was not appropriate.

The present invention has been developed to solve the above-mentioned problems, and the core strand has a larger elongation than the side strand, and the elongation ratio of the core strand and the side strand is in an appropriate balance. It is an object of the present invention to provide an elevator rope that achieves uniform stress distribution in a rope cross section and is excellent in strength, flexibility, and bending fatigue resistance.

[0009]

As a means for solving the above-mentioned problems and achieving the object, the present invention provides a fiber rope in which a plurality of side strands are wound around a single core strand and twisted. Developing an elevator fiber rope configured such that the elongation at break of the synthetic fiber constituting the core strand is 20 to 100% larger than the elongation at break of the synthetic fiber constituting the side strand. And
Adopted.

[0010] The present invention also relates to a fiber rope in which a plurality of side strands are wrapped and twisted around the periphery of one core strand, and the core strand composed of a high-strength low-elongation synthetic fiber is provided. 3 strands to 5 strands coreless structure, side strands composed of the same fiber are 6 strands to 2 strands
A fiber rope for elevators having a zero-twist core structure was developed and adopted.

In the elevator fiber rope configured as described above, the effective cross-sectional area of the core strand is increased or decreased according to the twist angle of the side strand, and the surface pressure of the side strand to the side strand and the side strand to the core strand are determined. Elevator fiber rope configured to have the same surface pressure, elevator fiber rope in which side strands or side strands and core strands are covered with a synthetic fiber braid, and form retention and pairing in side strands and core strands Developed and adopted an elevator fiber rope impregnated with a synthetic resin for the purpose of improving abrasion, and an elevator fiber rope in which the outer periphery of the rope was covered with a braided body, a thermoplastic resin, or a braided body and a thermoplastic resin. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention, in which a core strand 1 and a side strand 2 are shown.
The rope R is formed by using different fibers having different elongation rates. The core strand 1 composed of one rope is a general-purpose fiber such as polyester, nylon, polypropylene, or polyethylene, or a high-strength fiber having a relatively large elongation rate. Made of synthetic fibers.

The side strand 2 is made of aramid fiber, PBO
(Polybaraphenylene benzobisoxazole) fiber,
It is made of high-strength low-elongation fiber such as ultra-high-molecular-weight polyethylene fiber and polyarylate fiber. Six ropes are arranged around the core strand 1 and twisted to form a rope.

The core strand 1 and the side strand 2 are
The elongation at break of the general-purpose fiber of the core strand 1 is 20 to 20 times higher than the elongation at break of the high-strength low-elongation fiber of the side strand 2.
It is set to be 100% larger.

With respect to the elongation at break of the side strand 2,
If the rate of increase in the elongation at break of the core strand 1 is 20% or less, the balance between the side strand 2 and the core strand 1 will be poor, and the core strand 1 will cut first to exhibit the high strength of the rope. If the rate of increase of the elongation at break of the core strand 1 exceeds 100% with respect to the elongation at break of the side strand 2, the elongation balance between the side strand 2 and the core strand 1 will not be balanced. It is not suitable because the strength of the core strand 1 does not contribute to the strength of the rope and high strength cannot be obtained, and the above range of 20 to 100% is suitable.

FIGS. 2 and 3 show a second embodiment of the present invention. In the first embodiment, different types of fibers having different elongation rates are used for the core strand 1 and the side strand 2. In this embodiment, the rope R has the same structure as the core strand 1 and the side strand 2 using the same fiber for the core strand 1 and the side strand 2.

That is, the core strand 1 and the side strand 2 are both made of a high-strength low-elongation fiber such as aramid fiber, PBO (polybaraphenylene benzobisoxazole) fiber, ultra-high-molecular polyethylene fiber, or polyarylate fiber. 1 to coreless structure, side strand 2
Has a core structure.

The coreless structure of the core strand 1 is as follows.
Three fibers are twisted using three fibers as shown in FIG. 3A, four fibers are twisted using four fibers as shown in FIG. 3B, and five fibers are used as shown in FIG. 3C. And then twisted. On the other hand, as shown in FIG.
What twisted the fiber of this (1 + 6 + 12) can be used.

When the core strand 1 is twisted two or less,
The circularity of the core strand 1 deteriorates, the side strands 2 cannot be arranged uniformly on the peripheral surface of the core strand 1 and the shape of the rope is unsuitable because it is unsuitable. Even if it becomes a structure, it is not suitable because the shape of the core is broken by bending during use and the circularity of the rope is also deteriorated. Therefore, the range of 3 twists to 5 twists described above is appropriate.

In the ropes R of the first and second embodiments, as shown in FIG. 4, if the twist angle θ of the side strand 2 with respect to the axis O of the rope R is increased or decreased, The elliptical shape of the side strand 2 in the cross section changes, the cross-sectional shape of the core strand 1 that fits in the center changes, and the space in the center increases or decreases. Therefore, by selecting the core strand 1 having a diameter suitable for the twist angle, the surface pressure of the side strand 2 and the side strand 2 and the surface pressure of the side strand 2 and the core strand 1 can be kept equal. By doing so, the contact pressure between the strands is made uniform, and the bending fatigue characteristics can be improved.

Further, as shown in FIG. 5, the core strand 1 and the side strand 2 or the outer peripheral surface of the side strand 2 are covered with a synthetic fiber braid 3 for the purpose of reinforcement, or the core strand 1 and the side strand 2 are covered. In some cases, a synthetic resin such as acrylic or urethane is impregnated for the purpose of maintaining the form and improving the abrasion resistance.

Further, as shown in FIG. 6, the outer peripheral surface of the rope R is covered with a braided body 4 made of synthetic fiber, and as shown in FIG. 7, the outer peripheral surface of the rope R is covered with a thermoplastic resin film 5. Alternatively, as shown in FIG. 8, the outer peripheral surface of the rope R may be covered with the braided body 4 and the surface may be covered with the thermoplastic resin film 5.

The operation of the thus constructed elevator fiber rope of the present invention will be described. The core strand 1 is cut first by making the elongation 20 to 100% larger than the side strand 2. The core, side strands 1, 2
However, even if they have the same structure, the load can be evenly distributed and the stress distribution can be made uniform.

In the second embodiment, the core strand 1 has a coreless structure, and the elongation is increased while keeping the strength reduction low, so that the elongation can be increased while avoiding non-uniform stress due to the increase in twist. Thus, the load balance can be improved and the performance of the rope can be improved.

Further, the effective sectional area of the core strand 1 is given by
Since the pressure is increased or decreased according to the twist angle θ of the side strand 2 and the surface pressure of the side strand 2 to the side strand 2 and the side strand 2 to the core strand 1 is made uniform, the bending fatigue can also be improved.

In addition, resin impregnation can improve shape retention and abrasion resistance, and the outer surface of the strand or rope can be coated with a braid, a thermoplastic resin, or a braid and a thermoplastic resin to form an inner surface. Protection and the durability of the rope can be improved.

[0027]

Next, specific examples of the present invention will be described. As an elevator fiber rope shown in FIG. 1 and FIG.
Using high-strength fiber ropes of 0 mm and 12 mm, two ropes with or without an outer layer coating were made to correspond to a breaking load of 76 kN. Table 1 shows the structure of the manufactured rope, the structure and material of the core strand and the side strand, the cross-sectional area ratio of the core strand to the side strand, the breaking load, the unit mass, and the like.

[0028]

[Table 1] As is evident from Table 1, the diameter of the core strand and the coreless structure both exceed the strength of the target wire rope in both Examples 1 and 2, and have excellent high strength. Also, the rope mass is about 1/4 to 1/6 lighter than the wire rope in both the first and second embodiments. Table 2 shows the results of measuring the performance of the manufactured rope of Example 1.
Example 1 is a rope composed of a core strand made of ultrahigh molecular weight polyethylene and side strands made of aramid.

[0029]

[Table 2] In addition, an S-bending fatigue test was performed to confirm the effect on the bending fatigue resistance characteristics by equalizing the surface pressure between the side strand and the side strand and the surface pressure between the side strand and the core strand. In the S bending fatigue test, two sheaves having a diameter 40 times the rope diameter were used, and the applied load was 1/10 of the standard breaking load.
The bending was performed 3.6 million times. The results are shown in Table 2 above. From the results, it can be seen that the bending fatigue characteristics are superior to those of the wire rope.

[0030]

As described above, according to the first aspect of the present invention, the core strand is a fiber rope in which a plurality of side strands are wound around the periphery of one core strand and twisted. The elongation at break of the synthetic fiber is 20 to 1 more than the elongation at break of the synthetic fiber constituting the side strand.
Since the present invention relates to an elevator fiber rope configured to be 00% larger, the elongation ratio of the core strand and the side strand is well-balanced, the stress distribution can be made uniform, and the rope has high strength. This is an optimum rope as a fiber rope for elevators that can be exhibited, tensile strength is regarded as important, and weight reduction is required.

According to a second aspect of the present invention, there is provided a fiber rope in which a plurality of side strands are wound around the periphery of one core strand and twisted, and are made of synthetic fiber having high strength and low elongation. The constituted core strand has a coreless structure of 3 to 5 strands, and the side strand composed of the same fiber relates to a fiber rope for an elevator constituted of a core structure of 6 to 20 strands. Because there is, while avoiding non-uniformity of stress due to the increase in twist, the elongation of the core strand is increased, the load balance can be improved and the performance of the rope can be improved, and the high strength of the rope can be exhibited,
It will be the best rope for elevator.

Further, since the surface pressures of the side strands to the side strands and the side strands to the core strands are made uniform, the bending fatigue resistance of the rope is also improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention and a sectional view thereof.

FIG. 2 is a side view showing a second embodiment of the present invention and a sectional view thereof.

FIG. 3 is a sectional view showing another embodiment of the second embodiment.

FIG. 4 is a side view showing a third embodiment of the present invention and a sectional view thereof.

FIG. 5 is a side view in which a core strand and side strands are covered with a braid, and a cross-sectional view thereof.

FIG. 6 is a partially cutaway side view in which the outer peripheral surface of the rope is covered with a braided body, and a cross-sectional view thereof.

FIG. 7 is a partially cutaway side view in which the outer peripheral surface of the rope is covered with a synthetic resin, and a cross-sectional view thereof.

FIG. 8 is a partially cutaway side view in which the outer peripheral surface of the rope is covered with a braided body and the surface is covered with a synthetic resin, and a cross-sectional view thereof.

FIG. 9 is a simplified diagram showing an attached state of an elevator rope.

[Explanation of symbols]

 1 core strand 2 side strand R rope

Continued on the front page (72) Inventor Takashi Maekawa 11-1 Nishikinakacho, Kaizuka-shi, Osaka F-term in Tezak Nishikihama Works (reference) 3B153 AA14 AA34 AA45 AA47 BB01 BB20 CC13 CC19 CC21 CC22 CC23 FF04 GG01 GG03 GG25 GG40 3F305 BB02 BB14

Claims (6)

[Claims] 1. A fiber rope in which a plurality of side strands are wound around a single core strand and twisted, and the elongation at break of synthetic fibers constituting the core strand constitutes the side strand. An elevator fiber rope configured to have an elongation at break of 20 to 100% greater than that of a synthetic fiber. 2. A fiber rope in which a plurality of side strands are wound around one core strand and wound around the core strand, and three core strands composed of high-strength low-elongation synthetic fibers are used. An elevator fiber rope having a 5-strand coreless structure and a side strand made of the same fiber having a 6-twist to 20-strand core structure. 3. The method according to claim 1, wherein the effective cross-sectional area of the core strand is increased or decreased according to the twist angle of the side strand, so that the surface pressure of the side strand to the side strand is equal to the surface pressure of the side strand to the core strand. Item 3. An elevator fiber rope according to Item 1 or 2. 4. A side strand or a side strand and a core strand covered with a synthetic fiber braid.
The fiber rope for an elevator according to any one of Claims 2 and 3. 5. An elevator fiber rope according to claim 1, wherein the side strands and the core strands are impregnated with a synthetic resin for the purpose of maintaining the form and improving the abrasion resistance. . 6. The rope according to claim 1, wherein the outer periphery of the rope is covered with a braided body, a thermoplastic resin, or a braided body and a thermoplastic resin.
The fiber rope for an elevator according to any one of claims 4 and 5.