JPH0550617U - Radiation resistant / flexible cable - Google Patents

Abstract

(57) [Summary] [Purpose] The flex resistance of the conductor 1 does not deteriorate even under a radiation environment, and the flex resistance of the conductor 1 is improved. [Structure] The insulating coating 2 and the sheath 6 of the insulating core wire 3 are made of a thermoplastic polyurethane elastomer, and the conductor 1 is a copper alloy foil yarn in which the following copper alloy foil is wound around an aromatic polyamide fiber yarn. It consists of. "0.02-0.5% by weight of magnesium, 35-100% by weight of phosphorus with respect to magnesium, 0.01-0.5% by weight in total of two or more of indium, tin, lead and antimony, zirconium Is a high-strength and high-conductivity copper alloy containing 0.01 to 0.8% by weight and the balance being substantially copper. ”The elastomer has radiation resistance and bending resistance, and does not decompose by radiation. The copper alloy has excellent flex resistance. Therefore, the cable P having this configuration has excellent radiation resistance and bending resistance, and does not corrode the conductor due to decomposed gas.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a cable for a robot used in a radiation environment such as a nuclear facility.

[0002]

[Prior art and its problems]

 Generally, a cable for a robot is required to have bending resistance, and a polyvinyl chloride admixture, fluororesin, or polyethylene is used as an insulating covering material for the insulating core wire.

However, when this conventional cable is used in a high radiation environment, the insulating coating material is decomposed by radiation, and the decomposed gas corrodes the conductor surface or lowers the mechanical strength of the coating material.

Corrosion of the conductor surface causes poor continuity, and if it fails, the operation of the robot becomes unstable. In addition, a decrease in mechanical strength leads to a decrease in bending resistance, damage to the insulation coating, short circuits, leaks to the ground, and unexpected situations such as robot runaway. is there.

In view of the above points, the present invention aims to improve the flex resistance of a conductor and to provide a radiation resistant insulating coating and a sheath without lowering the flex resistance. It

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, in the present invention, a plurality of insulating core wires are twisted together, and a tape is wound around this and pressed and wound to form a cable core, and a sheath is provided around it. In the well-known cable, the conductor of the insulating core wire is a wire of the following copper alloys A to G, and the insulating coating and sheath of the insulating core wire are made of thermoplastic polyurethane elastomer.

Note (A) 0.02 to 0.5% by weight of magnesium and 35 to 100% by weight of phosphorus based on magnesium, which are at least selected from the group consisting of indium, tin, lead and antimony. A high-strength and high-conductivity copper alloy containing 0.01 to 0.5% by weight in total of two kinds and the balance substantially consisting of copper.

(B) It contains 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium, and 0.01 to 0.8% by weight of zirconium, with the balance being practical. High-strength and high-conductivity copper alloy consisting of copper.

(C) 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus based on magnesium, 0.01 to 0.8% by weight of zirconium, and indium, soot, lead and A high-strength and high-conductivity copper alloy containing 0.01 to 0.5% by weight of one selected from the group consisting of antimony and the balance being substantially copper.

(D) 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium, 0.01 to 0.8% by weight of zirconium, and indium, soot, lead and A high-strength and high-conductivity copper alloy containing 0.01 to 0.5% by weight in total of two kinds selected from the group consisting of antimony, and the balance substantially consisting of copper.

(E) It contains 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus and 0.01 to 0.5% by weight of antimony, and the balance is substantially the same. High strength and high conductivity copper alloy made of copper.

(F) 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium and 0.01 to 0.5% by weight of tin, and the balance substantially. A high-strength and highly conductive copper alloy made of copper.

(G) Contains 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium, and 0.01 to 0.5% by weight of lead, and the balance substantially. High-strength and high-conductivity copper alloy consisting of copper.

(JP-A-63-243239, JP-A-63-243240, JP-A-63-243241, JP-A-63-243242, JP-A-63-262437, JP-A-63-262437, (See Japanese Laid-Open Patent Publication No. 63-262435, Japanese Laid-Open Patent Publication No. 63-262436, etc.).

The conductor of the insulating core wire may be made of a copper alloy foil yarn in which the foil tape of the copper alloys A to G is wound around the radiation resistant high tensile strength fiber yarn. As the radiation resistant high tensile strength fiber yarn, aromatic polyamide fibers such as Kevlar (DuPont, USA: trade name), ceramic fibers such as Ibiwool (trade name: Ibiden Co.), and other carbon fibers are appropriately used. Used for.

Examples of the thermoplastic polyurethane elastomer include Resamine P-890 (JISA hardness: 90, trade name of Dainichiseika Kogyo Co., Ltd.), Resamine P-1098 (JIS A hardness: 95, Dainichiseika Co., Ltd.). ) Trade name), Kuramilon U9185 (JIS A hardness: 85, Kuraray Co., Ltd. product name) and the like. Resamine-P890 is a polycarbonate type, Resamine P-1098 is a polyester type, and Chlamylon U9185 is a polyether type.

[0017]

[Action]

 In the cable according to the present invention having such a structure, the copper alloy wire of the above-mentioned compositions A to G forming the conductor is excellent in bending resistance as described in JP-A-63-243239. Also in terms of conductivity, it is comparable to pure copper. For example, in the fatigue characteristics, under the condition that the bending strain is 0.306%, the number of break bending of the copper alloy wire is 1610,000 times, whereas that of the pure copper wire is about 43,000 times, which is about 1/4. Yes, under the condition of bending strain of 0.22%, the above copper alloy wire: 31.5 million times or more, the pure copper wire: about 193,000 times and about 1/260 or less, and the bending strain of 0.18%, The copper alloy wire is 62 million times or more, and the pure copper wire is about 218,000 times, which is about 1/280 or less.

In addition, the thermoplastic polyurethane elastomer forming the insulating coating and the sheath has high flexibility as well as radiation resistance. Therefore, their characteristics are improved as a cable.

Further, when the conductor of the insulated core wire is formed of a copper alloy foil yarn, the copper alloy foil tape forming the conductor expands and contracts in the length direction and the radial direction, and has the characteristics of the high tensile strength fiber yarn. Together, they maintain sufficient flex resistance. Therefore, the bending resistance of the entire cable is further improved.

[0020]

【Example】

First, as shown in FIG. 1, 40 / 0.08 mm of the above-mentioned composition A copper alloy wire assembly stranded wire 1 was coated with Resamine P-890 (Example 1) or Resamine P-1098 (Example 2). By extrusion molding (insulation coating 2), a 0.2 mm ² insulating core wire 3 was obtained.

Further, as shown in FIG. 2, a copper alloy foil thread 13 in which a foil tape 12 of copper alloy A (thickness: 0.027 mm, width: 0.32 mm) is horizontally wound around the Kevlar thread 11 is provided. As shown in FIG. 3, 7 pieces were twisted to form a conductor 1, and Resamine P-1098 was extrusion-molded thereon (insulation coating 2) in the same manner as in Example 2 to obtain 0.2 mm ² The insulating core wire 3 was obtained (Example 3).

Next, six pieces of each insulating core wire 3 are collectively twisted together with the interposition 4, and the tape 5 is wound around this and pressed to form the cable core a, and the chlamylon U9185 is wound around the cable core a. A cable P according to the present invention was obtained by extrusion molding and providing a sheath 6.

On the other hand, as Comparative Examples 1 to 5, polyvinyl chloride (Comparative Example 2) and tetrafluoroethylene / ethylene copolymer resin (ETFE, Comparative Example 3) were used for the insulating coating 2, and the sheath 6 was used. Polyvinyl chloride (Comparative Example 1) and Perprene P-30B (JIS A hardness: 71, Toyobo Co., Ltd. trade name thermoplastic polyester elastomer, Comparative Example 4) were used, and pure copper (Comparative Example) was used as the conductor 1. A cable P having the same structure as that of the other examples was manufactured by using 5).

Table 1 shows the results of the bending test shown in FIG. 4 performed on the cables P of Examples 1 to 3 and Comparative Examples 1 to 5 under the following conditions. Note Bending angle: ± 90 degrees Bending radius R: 12.5 mm Load W: 1 kg Bending speed: 40 times / minute (each left and right is counted once) γ-ray irradiation: Radiation source: Co-60, dose rate, 0 Irradiation with 10 MGY at 0.85 MR / hr.

[0025]

[Table 1]

From these results, it can be understood that, in each of the examples, radiation (radiation) does not corrode the conductor (stranded wire) 1 and the bending resistance is improved.

In addition, in the above-described examples, when the conductor 1 or the foil tape 12 was replaced with the composition (A) having the composition (B) to (G), the same result was obtained.

[0028]

[Effect of the device]

 Since the present invention is configured as described above, it is possible to obtain a cable having excellent radiation resistance and bending resistance.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

[Fig. 2] Front view of copper alloy foil yarn

FIG. 3 is a sectional view of a conductor of an insulated core wire.

[Fig. 4] Bending test explanatory diagram

[Explanation of symbols]

 P cable a Cable core 1 Conductor (assembled stranded wire) 2 Insulation coating 3 Insulating core wire 4 Interposer 5 Presser winding layer (presser winding tape) 6 Sheath 11 Radiation resistant high tensile fiber yarn (Kevlar) 12 Copper alloy foil tape 13 Copper Alloy foil thread

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Masaaki Kihara 2-3-1 Iwata-cho, Higashi-Osaka City Tatsuta Electric Wire Co., Ltd. (72) Osamu Ehara 2-3-1 Iwata-cho, Higashi-Osaka City Tatsuta Electric wire company (72) Inventor Kenji Harada 2-3-1, Iwata-cho, Higashiosaka city Tatsuta Electric wire Co., Ltd.

Claims (8)

[Scope of utility model registration request] 1. A conductor made of the following copper alloy wire is coated with a thermoplastic polyurethane elastomer to form an insulating core wire,
Radiation resistance and bending resistance characterized by twisting multiple insulated core wires, winding tape around this and pressing it to form a cable core, and surrounding it with a sheath made of thermoplastic polyurethane elastomer cable. 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium, and at least two selected from the group consisting of indium, tin, lead and antimony in total of 0. 01-0.5% by weight,
A high-strength, high-conductivity copper alloy whose balance consists essentially of copper. 2. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of the following copper alloy wire. A high strength containing 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium and 0.01 to 0.8% by weight of zirconium, and the balance being substantially copper. Conductive copper alloy. 3. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of the following copper alloy wire. It is selected from the group consisting of 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium and 0.01 to 0.8% by weight of zirconium, and indium, tin, lead and antimony. One kind of thing is 0.
A high-strength and high-conductivity copper alloy containing 01 to 0.5% by weight and the balance being substantially copper. 4. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of the following copper alloy wire. It is selected from the group consisting of 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium, 0.01 to 0.8% by weight of zirconium, and indium, tin, lead and antimony. A high-strength and high-conductivity copper alloy containing 0.01 to 0.5% by weight in total of two kinds of alloys and the balance substantially consisting of copper. 5. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of the following copper alloy wire. A high strength containing 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus with respect to magnesium and 0.01 to 0.5% by weight of antimony, and the balance being substantially copper. Conductive copper alloy. 6. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of a wire of the following copper alloy. Note: 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus based on magnesium, and 0.01 of tin.
A high-strength and high-conductivity copper alloy containing 0.5% by weight to the balance substantially copper. 7. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of the following copper alloy wire. 0.02 to 0.5% by weight of magnesium, 35 to 100% by weight of phosphorus based on magnesium, and 0.01 to 0.5% of lead.
A high-strength and high-conductivity copper alloy containing 0.5% by weight and the balance substantially consisting of copper. 8. The radiation resistant / flexible cable according to claim 1, wherein the conductor of the insulating core wire is around the radiation resistant high tensile strength fiber yarn. A radiation-resistant and flex-resistant cable, which is made of a copper alloy foil thread wound horizontally with the copper alloy foil tape of.