JP3979777B2 - Endless wire rope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endless wire rope suitable for a circular cableway such as a ski lift.
[0002]
[Prior art]
A cableway represented by a rope for a ski lift has a wire rope connected endlessly and circulated by a sheave. As such a rope endless rope for moving cords, a round strand rope having a circular cross section perpendicular to the longitudinal direction has been generally used.
However, with this structure, it is difficult to increase the contact area with the sheave because the outer circumference of the rope is circular, and it is not possible to expect an improvement in power transmission efficiency. was there.
[0003]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems, and the object of the present invention is to improve the power transmission efficiency by reliably making surface contact with the sheave and during operation. An object of the present invention is to provide an endless rope that can reduce the generation of noise and is suitable for use in a circulating cableway.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a fiber core at the center, and six strands are twisted around the core, and each strand is a 3 × 2 + 3 structure core strand having a substantially triangular cross section and seven surrounding the core strand. A rope formed by using a flat rope having side strands composed of the above side strands and long-splicing a terminal, and a core strand having a 3 × 2 + 3 structure of the strand at a required length at a terminal portion of the rope main body. A thin rope having a diameter smaller than that of the core strand is inserted as a special core into the cavity of the removed strand to form a connecting strand, and the connecting strand is placed in a gap obtained by removing the fiber core at the center of the rope by a predetermined length. It is characterized by that.
[0005]
In general, the thin rope is preferably a 7 × 7 twisted rope.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 6 show an embodiment of an endless wire rope according to the present invention.
FIG. 1 shows an example in which an endless wire rope is applied to a cableway for a ski lift, and R is an endless shape of a rope of the present invention by a terminal connecting portion (long splice portion). 6 is a transporter 6 and 7 attached at a predetermined interval, 7 is a drive sheave passing through one end of the rope of the present invention, 8 is a tension sheave passing through the other end, and 9 is a weight.
[0007]
FIG. 2 shows a cross section perpendicular to the longitudinal direction of a portion of the rope of the present invention other than the terminal connection portion, and six strands 2 having a substantially triangular cross section are arranged around the central fiber core 1 and twisted. It consists of a flat wire rope with a combined twisted Lang twist.
[0008]
That is, each strand 2 is composed of a total of nine wires, ie, six wires 20 having relatively large diameters and three wires 21 having relatively smaller diameters, and each of the six wires 20 has a Y shape. It has a core strand 2a having a triangular shape twisted in a structural formula (3 × 2 + 3) so that three thin wires 21 are located at a branching portion, and nine or more (in this example) around the core strand 2a 12) relatively large-diameter side wires 22 are arranged, and the strands 2b are stranded.
Therefore, the rope of the present invention shown in FIG. 2 has a structure of 6 × F [(3 × 2 + 3) +12], and the outer diameter of each strand 2 is larger than the outer diameter of the fiber core 1.
[0009]
FIG. 3 shows a part of the end connecting portion S of the rope of the present invention, and the inside of the rope so that the two strands 2 ′ and 2 ′ intersect the cavity 100 obtained by removing the central fiber core 1. It consists of a long splice plugged in.
[0010]
FIG. 4 representatively shows one strand (connection strand) 2 ′ of the terminal connection portion S, and a core strand 2a having a (3 × 2 + 3) structure surrounded by the side strands 2b of the strand 2 is shown. The required length is removed, and a thin rope 3 having an outer diameter D4 smaller than the outer diameter D2 of the old core strand 2a is inserted as a special strand into the gap of the side strand 2b. The strand has an outer diameter D3 smaller than the outer diameter D1 of 2 and equal to or smaller than the outer diameter of the fiber core 1.
[0011]
In order to make the outer diameter of the terminal connecting portion S equal to or smaller than the outer diameter of the fiber core 1, the thin rope 3 has five or more thin wires 30 having a diameter of 0.3 to 0.7 mm as shown in FIG. Thus, it is preferable that many strands 3a twisted together are twisted together into, for example, a 7 × 7 structure.
In the present invention, the end connecting portion S is formed by long splicing using the strand 2 'in which the thin rope 3 is inserted as a special strand as described above.
[0012]
The long splice processing method is arbitrary such as parallel splicing, cross splicing, and double cross splicing. Preferably, a method is adopted in which each strand is unwound, cut to a specified length, and the strands of both ends are combined one by one. Is done.
FIG. 6 shows an example of this long splicing process, where, for example, a band of 500 dr (dr is a rope diameter) is banded from the end of the loaf terminal as shown in (a), and the rope end 6 is shown as (b). The strand 2 is unwound and the fiber core 1 is cut and removed at the position of the band portion. The six strands 2 are designated as A, B, C, D, E, F, A ′, B ′, C ′, D ′, E ′, and F ′ for easy understanding.
[0013]
Next, among the six strands, every other strand, three strands A, C, E, B ′, D ′, and F ′ are cut at a length: 20 dr shown in FIG. The strands B, D, F, A ′, C ′, and E ′ are cut into b length: 160 dr, c length: 330 dr, and d length: 500 dr shown in (b).
[0014]
Then, as shown in (c), the core strand 2a of 50 dr length is formed from each of the b length, c length and d length in the strands B, D, F, A ′, C ′, and E ′. The thin ropes 3 are respectively inserted into the hollow side strands 2b, and the core is replaced.
After inserting the thin rope 3 in this way, the wires of the side strands 2b are combined and shaped into a strand shape, and a resin tape is appropriately wound around the outer periphery.
[0015]
Now that the preparations are complete, as shown in FIG. 5 (d), the two ends are butt-matched so that the strands are alternately arranged, the A 'strand is in front, the A strand is placed next to it, and the corresponding strands at both end portions Unravel one of them and put the other into the trace. When the insertion of each strand is completed, the state as shown in FIG.
[0016]
After that, as in normal splicing work, each strand is stretched in a straight line, spiked at the intersection, the fiber core 1 is taken out, the strand is inserted into the trace, and the fiber according to the length of the inserted strand The core 1 is excised. Similarly, the strand is inserted while taking out the fiber core on the opposite side. By repeating these steps, the strand insertion is completed. After that, shape the outer shape of the rope and insert the pillow core. Thus, an endless cableway composed of a flat rope having the terminal connection portion S is completed.
[0017]
In addition, this invention is not limited to an Example, A flat wire rope has another structure, for example, 6 * F [(3 * 2 + 3) +7] structure, 6 * F [(3 * 2 + 3) +9 ], 6 × F [(3 × 2 + 3) + 12 + 12] structure, 6 × F [(3 × 2 + 3) + 12 + 15] structure, and the like.
[0018]
[Effect of the embodiment]
The flat rope has a thin fiber core 1 at the center of the rope, and the diameter of the strand 2 is relatively large. For this reason, if it is going to adopt the long splice processing which is generally performed with a strand rope having a round cross section, the strand 2 which is untwisted by removing the fiber core 1 cannot be inserted into the center of the rope during this processing. If it is forcibly inserted, the strands on the side of the rope main body will bulge up, and the strands will not be in close contact with each other, resulting in gaps. As a result, the strand displaces in the circumferential direction, the twist moves, the rope loses its shape, breakage occurs frequently, and it cannot be used as a recirculating cableway such as a ski lift where safety is important.
[0019]
However, in the present invention, the core strand 2a having a (3 × 2 + 3) structure surrounded by the side strands 2b of the strand 2 is removed by a required length, and the gap between the side strands 2b is removed from the outer diameter D2 of the old core strand 2a. A thin rope 3 having a small outer diameter D4 is inserted as a special strand. For this reason, the diameter of the strand inserted into the rope center can be made as thin as the outer diameter of the fiber core 1.
For this reason, the strands in the spliced portion do not swell and no gaps occur between the strands. Therefore, an endless rope made of a flat rope can be obtained without causing a loss of shape.
[0020]
Next, specific examples of the present invention will be shown.
As the rope body, 6 × F [(3 × 2 + 3) +12] having a diameter of 28 mm was used. The diameter of the fiber core was 10.5 mm, the outer diameter of each strand was about 11.0 mm, and the core strand diameter of the round wire triangular section was about 5.5 mm.
[0021]
Both ends of the rope main body are processed according to the process of FIG. 6, and the b length, c length, and d length of each of the strands B, D, F, A ′, C ′, E ′ for splicing are The core strand 2a having a length of 50 dr is removed, and a thin rope having a diameter of 4.9 mm is inserted into the hollow side strand 2b, and the strands B, D, F, A ′, C ′, The diameter of E ′ was adjusted to 10.4 mm.
[0022]
The strands B, D, F, A ′, C ′, and E ′ were inserted into the rope center while locally removing the fiber core to obtain a long splice. The diameter of this long splice part was 30.1 mm, there was no gap between strands, and adjacent strands were in close contact.
[0023]
In order to see the performance of the obtained long splice, sheave diameter: 1800 mm (about 64 times the rope diameter), rope tension: 11.6 t (1/5 of the standard breaking load), bending method: repeated under U-bending conditions Bending was given. For comparison, a comparative long splice obtained by inserting a strand in which a core strand having a straight triangular cross section was left as it was without inserting a core into the center of the rope was repeatedly bent under the same conditions. As a result, in the comparative long splice, the strands were rearranged at 40,000 cycles, resulting in loss of shape, but the long splices of the present invention did not lose shape even at 65,000 cycles.
[0024]
【The invention's effect】
According to claim 1 of the present invention described above, a core 1 having a fiber core 1 in the center and twisting six strands 2 around the fiber core 1 and each strand 2 having a 3 × 2 + 3 structure and a substantially triangular cross-section are provided. A rope formed by long-splicing a terminal using a flat rope having side strands 2b composed of seven or more side strands surrounding it, and 3 × 2 + 3 of the strand 2 at the end of the rope itself The core strand 2a having the structure is removed to a required length, and a thin rope 3 having a diameter smaller than that of the core strand 2a is inserted into the cavity of the side strand 2b as a special core to form a connecting strand. Since the fiber core 1 is inserted into the gap from which a predetermined length has been removed, there is no gap between the strands of the splice portion even if the fiber core has a small diameter. The occurrence of strand dislocation and the resulting loss of shape can be avoided. As a result, while taking advantage of the flat rope that has a flat outer surface and a large contact area with the sheave, it is possible to avoid a decrease in service life due to shape loss, which is a difficult point, and it is efficient and safe and durable. The excellent effect that it is possible to provide a cableway for a ski lift or the like is obtained.
[0025]
According to claim 2, since the thin rope is formed of a twisted rope having a 7 × 7 structure or the like, in addition to the effect of claim 1, the strength is high, and the insertion of the side strand into the cavity is made by appropriate flexibility. Is easy, and since the surface area is large, integration with the side strands is good, and an excellent effect that a good connecting strand can be obtained is obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of use of an endless rope according to the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line XX of FIG.
3A is an enlarged side view of a connection portion (long splice portion) in FIG. 1, and FIG. 3B is a cross-sectional view taken along line YY in FIG.
FIG. 4 is a side view of a connecting strand according to the present invention.
5A is a cross-sectional view taken along the line WW of FIG. 4, and FIG. 5B is a cross-sectional view taken along the line ZZ of FIG. 4;
FIGS. 6A to 6D are explanatory views showing the long splice processing step by step.
[Explanation of symbols]
1 Fiber core 2 Strand 2a Core strand 2b Side strand 3 Fine rope

Claims (2)

6 strands 2 are twisted around a fiber core 1 in the center, and each strand 2 is composed of a core strand 2a having a 3 × 2 + 3 structure and a substantially triangular cross section, and seven or more side strands surrounding the core strand 2a. A rope formed by using a flat rope having a side strand 2b and a long splice of the end, wherein the core strand 2a of the 3 × 2 + 3 structure of the strand 2 is removed from the end of the rope 2 by the required length. A narrow rope 3 having a diameter smaller than that of the core strand 2a is inserted as a special core into the cavity of the strand 2b to form a connecting strand, and the connecting strand is formed into a gap obtained by removing the fiber core 1 at the center of the rope by a predetermined length. Endless wire rope characterized by being inserted. The endless wire rope according to claim 1, wherein the thin rope is a twisted rope of 7 × 7 or the like.

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