JPH0550618U - 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] A copper alloy foil in which the insulating coating 2 and the sheath 6 of the insulating core wire 3 are made of thermoplastic polyurethane elastomer, and the conductor 1 is wound around the aromatic polyamide fiber yarn with the copper alloy foil tape described below. Composed of yarn. "Containing lead and tin, tin and antimony or lead and antimony, the total content of both is 0.02 to 0.15% by weight, and the content of each is 0.006% by weight or more, oxygen A high-strength and high-conductivity copper alloy having a content of 0.0001 to 0.005% by weight. ”The elastomer has radiation resistance and bending resistance, and does not decompose by radiation. Further, 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 problems, 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 known cable, the conductor of the insulating core wire is a wire of the following copper alloys A to C, and the insulating coating and the sheath of the insulating core wire are made of thermoplastic polyurethane elastomer.

(A) The total content of lead and tin is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the oxygen content is 0.0001 to 0. A copper alloy in which 0.005% by weight and the balance substantially consist of copper.

(B) A copper alloy in which the total content of tin and antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the balance is substantially copper.

(C) A copper alloy in which the total content of lead and antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the balance is substantially copper. .

In the copper alloy having the above composition (A), the total amount of lead and tin is 3. It is preferably 7 times or more, and even in the compositions of (B) and (C), the oxygen content is preferably 0.0001 to 0.005% by weight. (See JP-A-61-27363, JP-A-61-23737 and JP-A-61-23738).

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 C 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.

[0013]

[Action]

 In the cable according to the present invention configured as described above, first, the wire of the copper alloy having the above-mentioned compositions A to C forming the conductor has a very high flex resistance as described in JP-A-61-27363. It is excellent and has a conductivity comparable to pure copper. For example, in the fatigue characteristics, under the condition that the bending strain is 0.306%, the breaking bending number of the copper alloy wire is 161,000 times, whereas that of the pure copper wire is about 43,000 times, which is about 1/4. Under the condition that the bending strain is 0.22%, the above copper alloy wire: 31.5 million times or more, pure copper wire: about 11. Under the conditions of 930,000 times and about 260 times or less, and bending strain of 0.18%, the above copper alloy wire: 62 million times or more, pure copper wire: about 218,000 times and about 280 times or less.

Further, 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.

Furthermore, 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.

[0016]

【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 a Kevlar thread 11 is provided. As shown in FIG. 3, seven conductors were twisted to form a conductor 1, and Resamine P-1098 was extrusion-molded thereon (insulating 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, 6 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 a cable core a, and the chlamyron 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 of 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.

[0021]

[Table 1]

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

In the above example, when the conductor 1 or the foil tape 12 was replaced with the composition (A) having the composition (B) or (C), the same result could be obtained.

[0024]

[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 Interposition 5 Presser winding layer (holding tape) 6 Sheath 11 Radiation resistant high tensile strength fiber yarn (Kevlar) 12 Copper alloy foil tape 13 Copper Alloy foil thread

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

Claims (4)

[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. The total content of lead and tin is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, the oxygen content is 0.0001 to 0.005% by weight, and the balance is A high strength, high conductivity copper alloy consisting 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 and high-conductivity copper alloy in which the total content of tin and antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the balance is substantially copper. 3. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of the following copper alloy wire. The total content of lead and antimony is 0.02 to 0.15% by weight, and the content of each is 0.006% by weight or more,
A high-strength, high-conductivity copper alloy whose balance consists essentially of copper. 4. The radiation-resistant and flex-resistant 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 in parallel with the copper alloy foil tape of.