JPH1112966A - Wire rope equipped with function of self-detection of abrasion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire rope that has a function of self-detection of abrasion and of which abrasion can be promptly and readily detected from the appearance. SOLUTION: This wire rope comprises the core 3, a plurality of side-stands 4 that are twisted around the periphery of the core and a plurality of judging strands 5 that are mix-twisted with the wires of the outermost layer of the side strands and are coated with a metal having an apparent color different from that of the peripheral strands.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rope having a self-abrasion detecting function used for cableways such as elevator ropes and ski lifts.

[0002]

2. Description of the Related Art Elevator ropes and ski lifts are used under almost constant conditions, and the load used is also in a low load range with respect to the breaking strength of the ropes. In line wear. The degree of wear of the rope can be determined to some extent by visual inspection with the naked eye. Normally, at the time of regular inspection to check the damage status of the wire rope, visually inspect the appearance of places that are significantly worn by rubbing with sheaves etc.
The diameter of the rope at that point is measured, and at the same time, the dimension of the worn portion of the outermost strand is measured and recorded.

[0003] Conventionally, when checking the damage condition of a wire rope in use, first, a wear damage portion is determined by visual inspection, and the determined portion is determined using a caliper, a micrometer, a loupe with a memory, and other measuring devices. Measure and record the size of the worn part. For example, as shown in FIGS. 3 and 4, the length L and the width b of the worn-out portion are individually measured, recorded as the wear size together with the occurrence position, and the state of the temporal change of the rope is managed. I have.

[0004]

However, in the conventional wire rope, since it is difficult to distinguish between a damaged portion and a healthy portion, it is difficult to measure the size of the worn portion of the outermost strand. It takes time and effort. As described above, the cost for the wear check increases, and the equipment is stopped for a long period of time for the check, resulting in high cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a wire rope with a wear self-detecting function capable of quickly and easily detecting a worn state of a rope from the appearance. I do.

[0006]

SUMMARY OF THE INVENTION A wire rope with a wear self-sensing function according to the present invention comprises a core, a plurality of side strands twisted around the core, and a twisted pair at the outermost layer of the side strand. And a plurality of discriminating wires coated with a metal having a different appearance color from the surrounding wires.

[0007] The discriminating element wire is made of zinc, aluminum,
It is preferable that any one of a zinc-aluminum alloy, copper, and a copper alloy be plated. These coating materials can be easily distinguished from the appearance color of the steel wire, and are also excellent in abrasion resistance, weather resistance, solvent resistance,
It can be determined over a long period of time from the beginning to the end of use.

In the wire rope with a wear self-detecting function according to the present invention, since the outermost layer of the side strand is formed by twisting a plurality of discriminating wires coated with a metal having a different appearance color from the surrounding wires, As the wear of the rope progresses, the coating metal of the discrimination wire disappears, and the steel wire becomes exposed. The inspection operator can easily determine this from the surroundings with the naked eye. As described above, since the damaged portion can be easily identified, and the size of the damaged portion can be measured quickly and easily, the period for stopping the equipment for the wear inspection is significantly reduced.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Here, an example of an elevator rope will be described. An outer diameter 12 mm rope (JIS-G3525: 8 ×
S (19)% 12) was produced as a wire rope with a wear self-detection function. A fiber core is put in the core 3 of the rope 2, and eight side strands 4 are
They are twisted together.

The core 3 is made of sisal fiber and impregnated with rope oil for rust prevention. The side strand 4 is 1
S (1) consisting of a total of nine outer wires obtained by twisting nine core wires, nine inner wires, N1 bare wires, and N2 discriminating wires 5
+ 9 + 9). These strands of various diameters are S-twisted to form side strands 4.

The discrimination element wire 5 has, for example, a carbon content of 0.1.
A coated steel wire obtained by heat-treating a 47% by weight wire and drawing a zinc aluminum alloy on the drawn wire was used. In this case, it is desirable that the coating plating thickness t be 10 μm or more. The reason why the lower limit value of the coating plating thickness t is set to 10 μm is to enable long-term determination from the initial use to the end of use of the wire rope.

As shown in FIGS. 3 and 4, when measuring the size of the wear-damaged portion, the exposed steel substrate 5b can be easily distinguished from the surrounding coating metal 5a with the naked eye.
The length L1 and width b1 of the exposed steel base 5b can be accurately measured and recorded for each damaged portion in a short time, and the status of the temporal change of the rope can be quickly grasped. It is desirable to prepare a damage pattern comparison diagram by a photograph or the like in advance for the determination of the wear damage portion. The criteria for determining the rope life are
For example, when the length L1 of the exposed steel base 5b exceeds 3.0 mm, the rope is replaced. It is better to consider the ratio L1 / D with the diameter D of the discrimination element wire 5 for this judgment criterion.

[0013]

According to the present invention, since the outermost layer of the side strand is mixedly twisted with a plurality of discriminating wires coated with a metal having a different appearance color from the surrounding wires, the abrasion of the rope proceeds. In accordance with the above, when the covering metal of the discriminating wire disappears and the steel wire is exposed, the inspecting worker can easily discriminate the surrounding wire by the naked eye. In this way, the wear-damaged portion can be easily identified, and the dimensions of the damaged portion can be measured quickly and easily, so that the downtime of the equipment for the wear inspection is greatly reduced, and the maintenance and inspection cost is reduced. Is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a wire rope with a wear self-detection function according to an embodiment of the present invention.

FIG. 2 is an enlarged external view showing a part of a wire rope with a wear self-detection function.

FIG. 3 is a schematic diagram showing a wear damage site.

FIG. 4 is a cross-sectional view showing a wear damage site.

[Explanation of symbols]

 2: wire rope with wear self-detection function, 3: core, 4: side strand, 5: discriminating wire, 5a: coated metal, 5b: steel base.

Claims (2)

[Claims] 1. A core, a plurality of side strands twisted around the core, and a plurality of strands which are mixed and twisted on the outermost layer of the side strand and which are covered with a metal having a different appearance color from that of the surrounding strand. A wire rope with a wear self-detection function, comprising: 2. The discriminating element wire is zinc, aluminum,
A wire rope with a wear self-detection function, characterized in that one of zinc-aluminum alloy, copper, and copper alloy is plated.