JPH0553051U - 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.
The conductor 1 is composed of a copper alloy foil thread in which the following copper alloy foil is wound around an aromatic polyamide fiber thread while being composed of a soft vinyl containing 50 to 90 parts by weight of a plasticizer with respect to 0 part by weight. . "Indium content is 0.047-1% by weight, oxygen content is more than 0.01% by weight and 0.03% by weight
A high-strength and high-conductivity copper alloy having a balance substantially consisting of copper, which is less than or equal to 4.7 times the indium content. The elastomer and the soft vinyl having the above composition have satisfactory radiation resistance and flex resistance, and the elastomer does not decompose by radiation. The copper alloy wire has excellent bending 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 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 a known cable, the conductor of the insulating core wire is a wire of the following copper alloy A, 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 and 50% plasticizer. It was decided to use soft vinyl in an amount of up to 90 parts by weight.

(A) The indium content is 0.047 to 1% by weight, the oxygen content is more than 0.01% by weight and 0.03% by weight or less, and the indium content is 4.7 times the oxygen content. The above is a copper alloy whose balance consists essentially of copper. (See Japanese Patent Publication No. 61-46535).

The conductor of the insulating core wire may be made of a copper alloy foil thread in which the foil tape of the copper alloy A is wound around the radiation resistant high tensile strength fiber thread. The radiation resistant high tensile strength fiber yarn includes aromatic polyamide fiber such as Kevlar (DuPont, USA: trade name), ceramic fiber such as Ibiwool (trade name: Ibiden Co.), and other carbon fiber. Use as appropriate.

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 in the above range is that, as can be understood from Table 1, the bending resistance of the sheath is significantly deteriorated when it goes out of the range. 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-2ethylhexyl trimellitate) fatty acid ester system: DOA (di2ethylhexyl adipate) phosphate ester system: TCP ( Tricresyl phosphate) Polyester type: Adipic acid polyester, W-360ELS (Dainippon Ink and Chemicals, Inc. trade name) Chlorinated paraffin type: Salt Para K-50 (Ajinomoto Co., Inc. trade name).

[0012] Further, a filler, a stabilizer, a flame retardant, a lubricant, a colorant 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.

[0013]

[Action]

 In the cable according to the present invention constructed as described above, the copper alloy wire of the above composition A forming the conductor is excellent in bending resistance and conductivity as described in Japanese Patent Publication No. 61-46535. However, it is not inferior to pure copper. For example, in the fatigue characteristics, under the condition that the bending strain is 0.306%, the number of times of bending and breaking of the copper alloy wire is 16. In comparison with 10,000 times, that of pure copper wire is about 43,000 times, which is about a quarter, and bending strain is 0. Under the condition of 22%, the above-mentioned copper alloy wire: 31.5 million times or more, pure copper wire: about 1193,000 times and about 1/260 or less, and under the condition of bending strain 0.18%, the above-mentioned copper alloy wire: 6200. 10,000 times or more, pure copper wire: about 218,000 times, which is less than about 280 times.

Further, the thermoplastic polyurethane elastomer forming the insulating coating and the soft vinyl having the above-mentioned composition forming the sheath have high flexibility as well as radiation resistance. Therefore, the cable has high radiation resistance without deterioration in bending resistance.

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, 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 .

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 (insulation coating 2) in the same manner as in Example 3 to obtain 0.2 mm ² The 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 a tape 5 is wound around this core and wound around the core a. A soft vinyl of a weight part (PHR) of a plasticizer shown in (4) 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) in which the weight part of the plasticizer was outside the above range was used for the sheath 6 and Perprene P-30B (JISA hardness: 71, Toyo). Spindle Co., Ltd. trade name Thermoplastic Polyester Elastomer, Comparative Example 5) was used, and further, 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.

The cables P of Examples 1 to 4 and Comparative Examples 1 to 6 were subjected to the bending test shown in FIG. 4 under the following conditions, and the results are shown in Table 1. 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.

[0021]

[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 of the examples.

[0023]

[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 front 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 (2)

[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. The indium content is 0.047 to 1% by weight, the oxygen content is more than 0.01% by weight and 0.03% by weight or less, the indium content is 4.7 times or more the oxygen content, and the balance A high-strength and high-conductivity copper alloy consisting essentially of copper. 2. The conductor of the insulating core wire comprises a copper alloy foil yarn in which the foil tape of the copper alloy is wound around the radiation resistant high tensile strength fiber yarn. Radiation-resistant / flexible cable.