JPH0553047U - 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 of the insulating core wire 3 is made of thermoplastic polyurethane elastomer, and the sheath 6 is made of vinyl chloride resin 10.
It is composed of a soft vinyl containing 50 to 90 parts by weight of a plasticizer with respect to 0 parts by weight, and a copper alloy foil yarn in which the following copper alloy foil tape is wound around an aromatic polyamide fiber yarn. "The total content of indium and tin, lead or antimony is 0.02 to 0.15% by weight, the content of each is 0.006% by weight or more, and the oxygen content is 0.000.
High strength and high conductivity copper alloy of 1 to 0.005% by weight. The elastomer and the soft vinyl having the above composition are satisfactory in radiation resistance and bending resistance, and the elastomer does not decompose by radiation. The copper alloy foil yarn 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 application]

 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 a well-known cable, the conductor of the insulating core wire is a wire of the following copper alloys A to E, and the insulating coating of the insulating core wire is a thermoplastic polyurethane elastomer, and the sheath is 100 parts by weight of vinyl chloride resin. The plasticizer is composed of 50 to 90 parts by weight of soft vinyl.

(A) A high-strength and high-conductivity copper alloy having an indium content of 0.01 to 1% by weight and an oxygen content of 0.01% by weight or less, and the balance being substantially copper.

(B) The indium content is 0.02 to 0.15% by weight, the oxygen content is 0.0001 to 0.005% by weight, and the indium content is 4.7 times or more the oxygen content. A high-strength and high-conductivity copper alloy whose balance consists essentially of copper.

(C) The total content of indium 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 high-strength and high-conductivity copper alloy composed of 005% by weight and the balance being substantially copper.

(D) A high strength of which the total content of indium and lead 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. Conductive copper alloy.

(E) High strength in which the total content of indium 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. Highly conductive copper alloy.

Also in the copper alloys having the compositions (D) and (E), the oxygen content is preferably 0.0001 to 0.005% by weight. In this case and in the case of the composition (C), indium is contained. The total content of tin, indium and lead, and indium and antimony is preferably 4.7 times or more the oxygen content. (See JP-A-60-17039, JP-A-61-3858, JP-A-61-3858, JP-A-61-23734 and JP-A-61-23735).

The conductor of the insulating core wire may be made of a copper alloy foil yarn in which a foil tape of any one of the copper alloys A to E is wound around a 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 of IBIDEN Co., Ltd.), and other carbon fibers may be appropriately used. To use.

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.

The reason why the weight part of the plasticizer is set to the above range is that, as can be understood from Table 1, the bending resistance of the sheath remarkably deteriorates when the range is exceeded. The plasticizer may be any of phthalic acid ester type, trimellitic acid ester type, fatty acid ester type, phosphoric acid ester type, polyester type and chlorinated paraffin type, and these are used alone or in combination. The products are as follows.

Phthalate ester system: DINP (diisononyl phthalate) DIDP (diisodecyl phthalate) trimellitic acid ester system: TOTM (tri-2-ethylhexyl trimellitate) fatty acid ester system: DOA (di2ethylhexyl adipate) phosphate ester system: TCP ( Tricresyl Phosphate) Polyester type: Adipate polyester, W-360ELS (Dainippon Ink and Chemicals, Inc. trade name) Chlorinated paraffin type: Salt Para K-50 (Ajinomoto Co., Inc. trade name).

Further, a filler, a stabilizer, a flame retardant, a lubricant, a coloring agent and the like can be appropriately added in appropriate amounts. Examples of the filler include heavy calcium carbonate, light calcium carbonate, aluminum hydroxide, aluminum silicate (calcined clay), magnesium silicate (talc), etc., and the stabilizer includes tribasic lead sulfate. , Lead-based compounds such as dibasic lead phosphite and dibasic lead phthalate, Ba-Zn-based compounds, Cn-Zn-based compounds, and the like.

[0018]

[Action]

 In the cable according to the present invention having such a structure, first, the copper alloy having the above-mentioned compositions A to E forming the conductor is excellent in bending resistance and conductive as described in JP-A-60-17039. Also in terms of sex, 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. Under the condition that the bending strain is 0.22%, the above-mentioned 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 soft vinyl having the above composition forming the sheath have high radiation resistance as well as bending resistance. Therefore, the cable has high radiation resistance without deterioration in bending resistance.

Further, when the conductor of the insulated core wire is formed from the foil yarn of each of the copper alloys A to D, the copper alloy foil tape forming the conductor expands and contracts in the length direction and the radial direction and has a high height. Tensile strength fiber Maintains sufficient bending resistance in combination with the characteristics of yarn. Therefore, the bending resistance of the entire cable is further improved.

[0021]

【Example】

First, as shown in FIG. 1, on a 40 / 0.08 mm copper alloy wire assembly stranded wire 1 having the above composition A, Resamine P-890 (Examples 1 and 2) or Resamine P-1098 (Example) was prepared. 3) was extruded (insulating coating 2) to obtain an insulating core wire 3 of 0.2 mm ² .

As shown in FIG. 2, a copper alloy foil thread 13 is produced by horizontally winding a foil tape 12 of copper alloy A (thickness: 0.027 mm, width: 0.32 mm) around a Kevlar thread 11. Then, as shown in FIG. 3, seven conductors were twisted to form a conductor 1, and in the same manner as in Example 3, Resamine P-1098 was extrusion-molded thereon (insulation coating 2) to obtain 0.2 mm ² An insulating core wire 3 was obtained (Example 4).

Next, the six cores of each insulating core wire 3 are collectively twisted together with the interposition 4 to form a core a, and the tape 5 is wound around the core a and wound around the core a. A soft vinyl of a weight part (PHR) of a plasticizer shown in (1) was extruded and a sheath 6 was provided to obtain a cable P according to this idea. At this time, 50 parts by weight of heavy calcium carbonate was added to each soft vinyl, and an appropriate amount of stabilizer and the like was added.

On the other hand, as Comparative Examples 1 to 6, polyvinyl chloride (PVC, Comparative Example 1), ethylene tetrafluoride / ethylene copolymer resin (ETFE, Comparative Example 2) and Resamine P-890 were used as the insulating coating 2. (Comparative Examples 3 to 5) was used, and soft vinyl (Comparative Examples 3 and 4) and Perprene P-30B (JISA hardness: 71, Toyo Co., Ltd.) in which the weight part of the plasticizer was outside the above range in the sheath 6. Spindle Co., Ltd. trade name Thermoplastic Polyester Elastomer, Comparative Example 5) was used, and pure copper (Comparative Example 6) was used for the conductor 1, and a cable P having the same configuration as the other example was also manufactured. did.

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 6 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 4MGY at 0.85 MR / hr.

[0026]

[Table 1]

From these results, it can be understood that the conductors (strands) 1 are not corroded and the flex resistance is not deteriorated by the radiation irradiation in each example.

In the above examples, the same results were obtained when the conductor 1 or the foil tape 12 was replaced with the composition (A) having the composition (B) to (E).

[0029]

[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

 ─────────────────────────────────────────────────── ─── 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 (6)

[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,
A plurality of the insulated core wires are twisted together, and a tape is wound around the insulation core wire to form a cable core, and a soft vinyl having a plasticizer of 50 to 90 parts by weight with respect to 100 parts by weight of the vinyl chloride resin around the cable core Radiation-resistant and flex-resistant cable characterized by having a sheath. A high-strength and high-conductivity copper alloy having an indium content of 0.01 to 1% by weight and an oxygen content of 0.01% by weight or less, and the balance being substantially copper. 2. The radiation-resistant and flex-resistant cable according to claim 1, wherein the conductor is made of the following copper alloy wire. The indium content is 0.02 to 0.15% by weight, the oxygen content is 0.0001 to 0.005% by weight, the indium content is 4.7 times or more the oxygen content, and the balance is substantially. High-strength and high-conductivity copper alloy consisting of 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 indium 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. 4. 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 indium and lead 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. 5. 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 indium and antimony is 0.02 to 0.
A high-strength and high-conductivity copper alloy containing 15% by weight, the content of each of which is 0.006% by weight or more, and the balance being substantially copper. 6. 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 a copper alloy foil tape.