JPH0594298U - Corrosion resistant wire rope - Google Patents

Abstract

(57) [Abstract] [Purpose] It can be manufactured efficiently and inexpensively with a simple process, and it is possible to prevent the decrease of the strength per unit area by suppressing the increase of the rope diameter, and the corrosion resistance due to abrasion. Provided is a corrosion-resistant wire rope which is free from deterioration. [Structure] In a wire rope in which a plurality of strands b are twisted around the outer circumference of a core rope a, a zinc wire c for sacrificial corrosion protection is arranged in a gap between the core rope a and the strand b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a corrosion-resistant wire rope suitable for use in a corrosive environment.

[0002]

[Prior Art]

 Generally, when using a wire rope in a corrosive environment such as seawater, a plated wire rope with high corrosion resistance is used by plating the wires that make up the wire rope with a metal such as zinc. There is.

[0003]

[Problems to be solved by the device]

 However, in such a plated wire rope, since each wire has to be plated, plating equipment is required separately from the rope twisting equipment, which complicates the manufacturing process. The cost is high. And in order to obtain sufficient corrosion resistance, it is necessary to increase the coating weight, but if the coating weight increases, the outer diameter of the wire increases and the rope diameter increases, and the apparent size of the rope increases. As a result, the strength against scratches decreases.

Further, in a wire rope used as a moving rope that frequently passes through sheaves, etc., the coating film exposed on the outer peripheral surface of the wire rope wears relatively early due to friction with the sheaves, and corrosion resistance deteriorates. Resulting in.

The present invention has been made by paying attention to such a point, and an object of the present invention is to enable efficient and inexpensive manufacturing in a simple process and to suppress an increase in rope diameter to reduce a unit area. It is an object of the present invention to provide a corrosion-resistant wire rope capable of avoiding a decrease in the strength of the hit and a decrease in the corrosion resistance due to wear.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention arranges a zinc wire for sacrificial corrosion protection in the gap between the core rope and the strand in a wire rope in which a plurality of strands are twisted around the outer circumference of the core rope. It is designed to be installed.

[0007]

[Action]

 In a wire rope having such a structure, when the strand is twisted around the outer circumference of the core rope via the voice, it is possible to incorporate a zinc wire between the core rope and the strand at the same time when the strand is twisted. It is possible to efficiently and inexpensively manufacture the product without the need for a separate plating treatment facility using only the twisting facility. Moreover, since the zinc wire is arranged in the gap between the core rope and the strand, the rope diameter does not increase so much, and thus the decrease in strength per unit area can be avoided, and the zinc wire is Since it is not exposed on the outer peripheral surface of the rope, even when it is used as a moving rope that frequently passes through sheaves, etc., the zinc wire is not worn and good corrosion resistance can be maintained over a long period of time. ..

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a wire rope according to an embodiment of the present invention. In this wire rope, six strands b are twisted around the outer circumference of an IWRC core rope a and IWRC 6 × Fi ( 29) is structured. A zinc wire c is arranged in the gap between the core rope a and the strand b.

Such a wire rope can be manufactured as follows. The manufacturing process is shown in FIG. 2. Reference numeral 1 is a voice, 2 is a leveling roll, 3 is a finishing roll, 4 is a capstan, and 5 is a reel. Then, a strand b is twisted around the outer circumference of the core rope a via the voice 2, and at the time of this twisting, a zinc wire c is simultaneously incorporated between the core rope a and the strand b to form a wire rope d. The desired wire rope d is obtained by sequentially winding it around the winding frame 5 while taking it with the capstan 4 through the soaking roll 2 and the finishing roll 3.

Here, the outer diameter of the zinc wire c to be incorporated in the gap between the core rope a and the strand b may be slightly larger than the width of the gap. Since the wire c is softer than the steel wire, the zinc wire c is crushed and deformed to fit in the gap, so that the arrangement of the zinc wire c hardly increases the rope diameter.

As a result of such a process, as a test sample, as shown in FIG. 3A, the outer diameter of the core rope a was 8.13 mm, the number of strands b was 6, and the outer diameter was 6.59 mm. IWRC 6xFi (29) with 6 zinc wires c between a and strand b, the outer diameter is 1mm, the twisting pitch is 124mm, and the rope diameter is 20.7mm. As shown in Fig. 3 (b), the outer diameter of the core rope a is 5.73 mm, the number of strands b is 6, and the outer diameter is 6.59 mm, between the core rope a and the strand b. A wire rope B having a structure of IWRC 6 × Fi (29) having six zinc wires c arranged, an outer diameter of 3 mm, a twist pitch of 124 mm and a rope diameter of 20.7 mm was manufactured.

Then, using the wire rope C having the conventional general IWRC 6 × Fi (29) structure in which the wire ropes A and B and the zinc wire are not incorporated, a seawater exposure test for one year was conducted in an actual sea area. The results of this seawater exposure test are shown in FIG.

As is clear from this figure, in the wire ropes A and B of the present invention, the rope diameter decreases with the exposure period as compared with the conventional general wire rope C due to the sacrificial anticorrosion effect of the zinc wire c. It can be seen that the reduction of the wire diameter, the reduction of the wire breaking force, and the reduction of the twisting value are small, and the corrosion resistance is improved.

In the wire ropes A and B of the present invention, since the zinc wire c is arranged in the gap between the core rope a and the strand b, the rope diameter hardly increases and therefore the unit area is small. It is possible to avoid a decrease in the strength of contact, and since the zinc wire c is not exposed on the outer peripheral surface of the rope, there is no wear of the zinc wire c even when it is used as a moving rope that frequently passes through sheaves and the like. Therefore, good corrosion resistance can be maintained for a long period of time.

In addition, as described above, in the wire ropes A and B of the present invention, during the step of twisting the strand b on the outer circumference of the core rope a, the zinc wire c is formed on the outer circumference of the core rope a simultaneously with the strand b. Therefore, it is possible to dispose it, and therefore, it is possible to efficiently manufacture it at low cost without the need for a separate facility or process as in the case of plating treatment.

In the above embodiment, the wire rope of the present invention has an IWRC 6 × Fi (29) structure, but the wire rope is not limited to this structure. However, for example, the core rope may be a fiber rope and the number of strands may be 8 or other. In short, multiple strands are twisted around the outer circumference of the core rope and A zinc wire for sacrificial corrosion protection may be arranged in the gap between them.

[0018]

[Effect of the device]

 As explained above, according to the present invention, it is possible to efficiently and inexpensively manufacture by a simple process, it is possible to suppress an increase in rope diameter, avoid a decrease in strength per unit area, and further, to prevent abrasion. It is possible to provide a corrosion-resistant wire rope that does not cause a reduction in corrosion resistance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a corrosion-resistant wire rope according to an embodiment of the present invention.

FIG. 2 is a manufacturing process drawing showing a process of manufacturing the corrosion-resistant wire rope.

FIG. 3 is a sectional view showing the structure of a corrosion-resistant wire rope of the present invention manufactured as a test sample.

FIG. 4 is a graph showing the results of a seawater exposure test conducted on the test sample.

[Explanation of symbols]

 a ... heart rope b ... strand c ... zinc wire

Claims (1)

[Scope of utility model registration request] 1. A wire rope in which a plurality of strands are twisted around the outer circumference of a core rope, wherein a zinc wire for sacrificial corrosion protection is arranged in a gap between the core rope and the strand. .