JPH07279940A - High bending withstanding rope - Google Patents

Abstract

PURPOSE:To ensure a high ability to withstand bending by forming core strands of a core rope and side strands of a main rope into a double twisting structure twisted into a Warrington type. CONSTITUTION:The rope 1 is a rope of double twisting structure, that is, a rope of [W(19)+8X7]+6XW(19) structure consisting of a core rope 2 of ware)+8X7 structure having a core strand 2a twisted into a Warrington type and six side strands 3 of W(19) structure twisted into Worlinton type around the core rope 2. The outside diameter of the rope reaches 3.0 to 5.0mm by twisting the core rope and the strands. Further the tightening factor of the core rope 2 and the shaping factor are preferable to be 4 to 11% and 65 to 90% respectively. It is desirable to coat the rope 1 with synthetic resin in order for the outside diameter to reach 4.0 to 7.0mm. Furthermore, it is desirable to use a soft polyamide resin composite as a coating material. Thus, a sufficiently high ability to withstand bending can be given to the rope.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a high bending durability rope. More specifically, the present invention relates to a high bending durability rope which is suitably used for a driving mechanism of a printing machine and an opening of an automatic loom and used in various fields.

[0002]

2. Description of the Related Art A rope used for a drive mechanism of a printing machine or an opening of an automatic loom is often repeatedly bent and stretched by a pulley for turning. At that time, since the secondary bending stress amplitude received by the strands of the rope increases beyond the fatigue limit, the durability of the rope is significantly reduced. The secondary bending is a local bending that occurs when the wire is pressed against the wire layer below it by the external pressure of the rope. Generally, the maximum amplitude of this secondary bending controls the life of the wire and thus of the rope. In general, it is effective to reduce the wire diameter in order to reduce the stress amplitude of the secondary bending, and a so-called cross twisted (19 + 8 × 7) + 6 × 19 structure double twisted rope is used. However, sufficient durability cannot be obtained. Also, as disclosed in JP-A-63-285313, a 7 × W (19) structure in which the strands are twisted in parallel into a Warrington type (JP-A-63-28531) is disclosed.
No. 3) or (7 × 7) + 6 × W (19) structure (edited by the wire rope handbook, edited by the Chiro-Shobo Showa 42)
-10-15 Page 263 of "Wire Rope Handbook" Figure 3.64
Although the multi-twisted rope of the reference) may be used, sufficient durability is not obtained.

Conventionally, the rope has been twisted so as to have a tightening rate of about 0 to 2% in order to prevent damage during twisting. The tightening ratio mentioned here is a value (percentage: percent) obtained by dividing the value obtained by subtracting the measured outer diameter from the calculated outer diameter by the calculated outer diameter. However, the calculated outer diameter is the sum of the outer diameters of the individual wires in the direction of the diameter of the rope, and the actually measured outer diameter is the value obtained by actually measuring the diameter of the circumscribed circle of the rope. Furthermore, the side strand preform is preformed so that the shaping ratio obtained by dividing the undulation diameter of the side strand when the rope is unraveled is about 95 to 100% by the measured outer diameter of the rope. It was said that the fatigue resistance would be improved by carrying out (Wire rope handbook editorial committee edition, Cretaceous Shobo, Showa 42-10-15, "Wire rope
See page 185 of the Handbook).

Further, in order to prevent the deformation of the shape, as disclosed in Japanese Utility Model Laid-Open No. 57-131622,
A rope having a synthetic resin coating on the outer circumference of the rope may be used.

[0005]

[Problems to be Solved by the Invention] Cross twisted (19 + 8
* 7) When a multi-twisted rope with a structure of + 6 * 19 was subjected to a durability test with a roller, the strands of the core rope began to wear out, and the strands of the side strands of the parent rope were broken at about the same time. The lines also sporadically wear out. This is because the bending fatigue durability of the side strands of the core rope and the parent rope is low. Also, when a Warrington type 7 × W (19) structure multi-twisted rope was subjected to a durability test with a roller, fatigue failure began to occur from the core strands, but the side strands were fatigued considerably later. Lose. This is because the side strand has good bending fatigue durability, but the core strand has a large strand diameter, so that the bending stress becomes large, and the tensile load on the core strand is large, and the core strand is fatigued and broken early. As described above, in the conventional technique, sufficient high bending durability could not be obtained, and there was a big problem.

The present invention has been made to solve the above problems, and has a double twist structure in which a core strand of a core rope and a side strand of a parent rope are twisted in a Warrington type. Another object of the present invention is to provide a rope having high bending durability.

[0007]

The high bending durability rope of the present invention comprises a core rope of W (19) + 8 × 7 structure having core strands twisted in the Warrington type, and the core. A double-twisted structure having six W (19) side strands twisted in a Warrington type around the rope, that is, (W (1
9) + 8 × 7) + 6 × W (19) structure rope having an outer diameter of 3.0 to 5.0 mm.

Further, it is preferable that the tightening rate of the core rope is 4 to 11% and the shaping rate is 65 to 90%.

The rope is preferably coated with a synthetic resin and has an outer diameter of 4.0 to 7.0 mm.

Further, it is preferable that the coating material is a flexible polyamide resin composition.

[0011]

In the high bending durability rope of the present invention, since the core strand of the core rope and the side strand of the parent rope are parallel-twisted, the strands are in line contact with each other. The pressure acting between them is reduced, and the bending durability can be improved. Further, since the tightening rate of the core rope is 4 to 11% and the shaping rate is 65 to 90%, it is possible to prevent the shape from being deformed and the secondary bending of the wire is less likely to occur. Further, by applying a synthetic resin coating to the outer circumference of the parent rope, it is possible to further prevent the shape loss.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The high bending durability rope of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a rope which is an embodiment of the high bending durability rope of the present invention, and FIG. 2 shows an apparatus for measuring the durability of the high bending durability rope of the present invention. FIG. 3 is an explanatory diagram of a roller in the apparatus shown in FIG.

As shown in FIG. 1, the loop 1 is (W (19)
+ 8 × 7) + 6 × W (19) structure. That is, it has a multi-twisted structure composed of one core rope 2 and six side strands 3, and the core strand 2a of the core rope 2 has a structure in which 19 strands are a kind of parallel twist. -Formed into a Linton twist. The outer diameter of rope 1 is 3.0
It is appropriately selected within a range of up to 5.0 mm.

Specifically, six first side wires 7 having a diameter slightly smaller than that of the core wire 6 are arranged around one core wire 6, and the first side wire 7 and the upper layers thereof are arranged along the first side wire 7. A second side wire 8 having a diameter smaller than that of the first side wire 7 is arranged on the upper side of the first side wire 7 along the valley portion between the first side wire 7 and the core wire 6 having the same diameter. Six side elements having a diameter slightly smaller than the core element wire 10 around the core strand 2a in which the third side element wires 9 are arranged and twisted in the same pitch and in the same direction. The core rope 2 is formed by twisting eight side strands 2b obtained by twisting the wires 11. The thickness of each strand of the core strand 2a of the core rope 2 is not limited to the above combination. In short, when the strands are twisted in the same direction at the same pitch, the strand diameter may be appropriately selected so that the strands come into line contact with each other. The side strand 3 of the rope 1 has six first side wires 13 having a diameter slightly smaller than the core wire 12 around one core wire 12, and the first side wire 13 A second side wire 14 having a diameter smaller than that of the first side wire 13 is arranged along the upper layer, and the first side wire 13 is formed on the upper layer along the valley between the first side wire 13 and the first side wire 13. Six thirds of the same diameter
The side strands 15 are arranged and twisted in the same pitch and in the same direction. Then, the six side strands 3 are core-rolled.
The rope 1 is formed by twisting around the rope 2.

As described above, the core strand 2 of the core rope 2
The reason why the side strands 3 of a and the rope 1 are twisted in parallel is as follows. That is, in the core strand of the core rope and the side strand of the parent rope, which are parallel twists, each element wire is in line contact, and each element wire is in point contact with the cross-twisted core strand and side strands. In comparison, the contact area between the wires is large, and the pressure acting between the wires is low. As a result, the bending durability of the rope in which the core strand of the core rope and the side strands 3 of the parent rope are formed in parallel twist is improved. The Warrington type has the smallest difference between the maximum strand diameter and the minimum strand diameter among the parallel twists of 19 strands, and is suitable for thin strands.

The tightening rate of the core rope 2 is in the range of 4 to 11%, and the shaping rate thereof is in the range of 65 to 90%. In this way, the tightening rate is set in the range of 4 to 11% because the tightening rate is 1
If it exceeds 1%, there is a problem that it is difficult to twist, and if it is over-tightened, the wire will be broken or the strand will be damaged during manufacturing. On the other hand, if the tightening ratio is less than 4%, the durability when it is bent becomes insufficient. Is. On the other hand, the shaping ratio is 65-9
The reason for setting the range to 0% is as follows. That is,
When the shaping ratio exceeds 90%, when the rope is used in a portion where it is bent, the force to try to tighten it toward the center of the rope does not act on the side strands so much that the secondary strand Bending is likely to occur. On the other hand, the shape ratio is less than 65%
However, the side strands will be frayed during cutting, making it unusable.

Further, in order to prevent the shape of the rope from being deformed, a coating of synthetic resin (hereinafter referred to as "coating") is applied to the outer circumference of the rope. As the coating material, polyamide 12, Polyamide 11 and polyamide 6
It is preferable to use a flexible polyamide resin composition such as 66 or polyamide 6/12. The outer diameter of the rope 1 after coating is appropriately selected within the range of 4.0 to 7.0 mm. Since the specific coating thickness has an optimum value for each outer diameter of the rope 1, it is determined by design calculation and experimentally.

Example 1 First, according to the specifications shown in Table 1, a rope 1 having a cross section shown in FIG. 1 was formed. That is, steel wire (material: JIS
G3506 SWRH62A) for drawing a galvanized busbar to form the core rope 2 and the side strands 3, respectively, the core strand core wire 6 of the core rope 2 having an outer diameter of 0.17 mm, Core strand first side wire 7 of core rope 2 having an outer diameter of 0.16 mm, core wire having an outer diameter of 0.13 mm
Core strand second side strand 8 of the rop 2, core outer strand 0.17 mm core strand third side strand 9, the outside diameter 0.15 mm
mm core wire 2 side strand core wire 10, outer diameter 0.
Side strand side strand 11 of core rope 2 of 14 mm, core strand 12 of side strand 3 of 0.33 mm outer diameter, outer diameter 0.3
First side strand 13 of 0 mm side strand 3, outer diameter 0.2
Second side wire 14 of 3 mm side strand 3, outer diameter 0.3
A third side wire 15 of 0 mm side strand 3 was produced.

According to the specifications shown in Table 1, as shown in FIG. 1, the core strand 2a of the core rope 2 and the side strand 3 of the rope 1 are Warrington twisted outer diameters 4.0.
mm (W (19) + 8 × 7) + 6 × W (19) structure twisted together and coated with a flexible polyamide 12 with a flexural modulus of 330 MPa on the outer periphery of the outer diameter of 5.5 m
m of Example 1 was obtained (the cross-section after coating is not shown).

[0020]

[Table 1]

Comparative Example 1 The rope of Comparative Example 1 is obtained by forming the rope 101, the cross section of which is shown in FIG. 4, in accordance with the specifications shown in Table 2, and the core strand of the core rope 102. 102a and low
The side strands 103 of the loop 101 are twisted together (19
+ 8 × 7) + 6 × 19 structure is different from the first embodiment. Others are almost the same as in the first embodiment. In particular,
Core of core rope 102 having outer diameter of 0.17 mm for drawing core wire 102 and side strand 103 by drawing a zinc-plated bus wire to steel wire (material: JIS G3506 SWRH62A) Strand core wire 1
06, core strand first side wire 107 of core rope 102 having an outer diameter of 0.14 mm, core rope 10 having an outer diameter of 0.14 mm
2 core strand second side strand 108, outer diameter 0.14 mm
Core strand 102 side strand core wire 110, outer diameter 0.14 mm core strand 102 side strand side wire 1
11, the core wire 112 of the side strand 103 having an outer diameter of 0.30 mm, the first of the side strand 103 having an outer diameter of 0.27 mm
Side strand 113, side strand 103 with an outer diameter of 0.27 mm
The second side wire 114 of was manufactured.

According to the specifications shown in Table 2, as shown in FIG. 4, the core strand 102a and the core strand 102a of the core rope 102 are provided.
The side strands 103 of the loop 101 are twisted in a twisted manner to form a (19 + 8 × 7) + 6 × 19 structure having an outer diameter of 4.0 mm, and the outer periphery thereof is coated with a flexible polyamide 12 having a flexural modulus of 330 MPa. A rope 101 of Comparative Example 1 having an outer diameter of 5.5 mm was obtained (the cross section after coating is not shown).

[0023]

[Table 2]

COMPARATIVE EXAMPLE 2 The rope of Comparative Example 2 has a cross section formed by the rope 201 shown in FIG. 5 in accordance with the specifications shown in Table 3. As shown in FIG. 5, in the rope 201, both the core strand 202 and the side strand 203 have a Warrington twist structure. Specifically, the core strand 2
For 02, core strand core wire 206 having an outer diameter of 0.35 mm, core strand first side wire 207 having an outer diameter of 0.33 mm, core strand second side wire 2 having an outer diameter of 0.26 mm, respectively.
08, core strand third side wire 20 with an outer diameter of 0.33 mm
9 was produced. Also, the outer diameter of the side strand 203 is 0.1.
33mm side strand core wire 212, outer diameter 0.30m
m side strand first side strand 213, outer diameter 0.23 mm
The side strand second side wire 214 and the side strand third side wire 215 having an outer diameter of 0.30 mm were manufactured.

According to the specifications shown in Table 3, as shown in FIG. 5, the core strand 202 and the side strand 203 were each Warrington twisted, and the outer diameter was 4.0 mm.
Twisted in a W (19) structure with a bending elastic modulus of 3
A rope 201 of Comparative Example 2 having an outer diameter of 5.5 mm coated with a flexible polyamide 12 of 30 MPa was obtained (the coating cross section is not shown).

[0026]

[Table 3]

COMPARATIVE EXAMPLE 3 Further, the rope of Comparative Example 3 has a cross section formed by the rope 301 shown in FIG. 6 in accordance with the specifications shown in Table 4. As shown in FIG. 6, only the side strands 303 of the rope 301 have a Warrington twist structure. Specifically, for the core strand 302a of the core rope, a core strand core wire 306 having an outer diameter of 0.18 mm, a core strand first side wire 307 having an outer diameter of 0.18 mm, a core wire, respectively.
0.18m outside diameter for each side strand 302b
m side strand core element wire 310 and side strand first side element wire 311 having an outer diameter of 0.17 mm were manufactured. Further, for the side strands 303 of the parent rope, side strand core wires 312 having an outer diameter of 0.33 mm, side strand first side wires 313 having an outer diameter of 0.30 mm, and side strand second wires having an outer diameter of 0.23 mm are used. A side wire 314 and a side strand third side wire 315 having an outer diameter of 0.30 mm were manufactured.

According to the specifications shown in Table 4, as shown in FIG. 6, only the side strands 303 are Wollington twisted and twisted into a (7 × 7) + 6 × W (19) structure having an outer diameter of 4.0 mm. The outer diameter of which is 5.5 m coated with a flexible polyamide 12 having a flexural modulus of 330 MPa on the outer circumference.
m of Comparative Example 3 was obtained (the cross-section after coating is not shown). In addition, the pitch of the example and each comparative example is 8 to 12 of the outer diameter of the strand in each strand.
For the double and rope, an appropriate value was selected within the range of 6 to 8 times the diameter of the rope.

[0029]

[Table 4]

A durability test was conducted on the ropes of Example 1 and Comparative Examples 1 to 3 obtained as described above. The method of the durability test is as follows.

As shown in FIG. 2, the total length is 1000 m.
m of Example 1 and Comparative Examples 1 to 3,
A spring S was connected to one end of each of 201 and 301 (hereinafter, represented by 1), and the loop 1 was routed so that the roll 1 would be in a 180 ° inversion state. The other end of the rope 1 is fixed to the crank 5. When the crank 5 of the motor M reciprocates in the directions A and B, the rope 1 also reciprocates in the directions A and B. Stroke of rope 1 is 10
0 mm, the speed was 500 reciprocations / minute, and one reciprocation was counted as one. Then, the tension of the rope 1 is 1 by the spring S.
It was set to be 00 to 2500 N (N: Newton).

FIG. 3 is a front view of the roller 4 ((a) of FIG. 3).
And a side view ((b) of FIG. 3), the groove bottom diameter g of the roller 4 is 180 mm, and the groove bottom cross-section has an arc shape with a radius of 3 mm suitable for the loop diameter. did. The material is polyacetal.

The stroke was repeated until the rope 1 to be tested was broken by such a device. Example 1 and Comparative Example 1
Table 5 shows the results of the durability test for Nos. 3 to 3. The number of ruptures of the rope in the durability test was represented by a value obtained by rounding the average value of 5 samples to the nearest 1,000,000.

[0034]

[Table 5]

In the durability test, the number of strokes when the rope breaks is compared. A comparative example 2 in which the conventional core strands and side strands are each Warrington twisted in a 7 × W (19) structure and the core strands and side strands of the core rope are twisted by crossing (19
Comparing with Comparative Example 1 having a + 8 × 7) + 6 × 19 structure, Comparative Example 2 is 50,000,000 times, whereas Comparative Example 1 is
Is 110,000,000 times and the durability is about double. Further, even when compared with Comparative Example 3 having a (7 × 7) + 6 × W (19) structure, Comparative Example 1 has 1.6 times the durability. However, the core strand of the core rope and the side strand of the parent rope are each Warrington twisted (W (1
9) + 8 × 7) + 6 × W (19) The structure of Example 1 having the structure is 310,000,000 times, which is 110,0 of Comparative Example 1.
The durability is greatly improved as compared with 0000 times.

As is clear from the above results, Comparative Examples 1 to 1
On the other hand, it can be seen that, in contrast to Example 3, Example 1 has high bending durability.

[0037]

The high bending durability rope of the present invention is a core rope.
It has a high degree of bending durability because it adopts a double-twisted structure in which the core strand of the loop and the side strand of the parent rope are twisted in a Warrington type.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a rope which is an embodiment of a high bending durability rope of the present invention.

FIG. 2 is an explanatory view of an apparatus for measuring the durability of the rope according to the present invention.

FIG. 3 is an explanatory diagram of a roller in the apparatus shown in FIG.

FIG. 4 is an enlarged cross-sectional view of a rope that is an example of a comparative example.

FIG. 5 is an enlarged cross-sectional view of a rope that is another example of a comparative example.

FIG. 6 is an enlarged cross-sectional view of a rope which is another example of a comparative example.

[Explanation of symbols]

 1 rope 2 core rope 3 side strand

Claims (4)

[Claims] 1. A core rope having a W (19) + 8 × 7 structure having core strands twisted in the Warrington type, and W (1) wound in the Warrington type around the core rope. 19)
Has 6 side strands of structure (W (19) + 8 ×
7) + 6 × W (19) A multi-twist structure rope having a high bending durability rope having an outer diameter of 3.0 to 5.0 mm. 2. The high bending durability rope according to claim 1, wherein the core rope has a tightening rate of 4 to 11% and a shaping rate of 65 to 90%. 3. The high bending durability rope according to claim 1, wherein the rope is coated with a synthetic resin and has an outer diameter of 4.0 to 7.0 mm. 4. The high bending durability roll according to claim 3, wherein the coating material is a flexible polyamide resin composition.
Pu.