JP2019086573A - Electric cable and work robot - Google Patents

Abstract

To improve the radiation heat-resistance performance of an electric cable.SOLUTION: An electric cable 1 of the present invention includes: an electric core material 2; a protection layer 3 composed of a high tension fiber layer 3A and an outer coat 3B surrounding the outer periphery of the electric core material 2; and a film 4 disposed at the outermost layer and with its reflection rate of infrared light of 80% or more. The electric core material 2 may be an optical fiber core, a communication cable, or a power supply cable.EFFECT: According to the present invention, it is possible to improve the radiation heat-resistance performance of an electric cable so as to be able to endure use under an environment of being moved or slid even in an environment of receiving radiation heat.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrical cable and a working robot.

  For example, the communication cable described in Patent Document 1 aims to withstand a high temperature (426.7 ° C.), and an optical fiber including a glass for high temperature mainly containing silicon that can withstand the temperature, and an optical fiber Surround multiple buffer tubes grouping channels into channels, bi-layer counter-woven aramid or KevlarTM fibers surrounding multiple buffer tubes, and bi-layer counter-woven aramid or KevlarTM fibers And an outer jacket.

Unexamined-Japanese-Patent No. 2016-186648

  In the case of electrical cables such as communication cables and power cables, it is general that the outer periphery of the electrical core is covered with a flexible protective layer and the protective layer appears on the outermost surface. In an electrical cable with such a configuration, the carbonization of the protective layer in a fire may cause loss of flexibility due to carbonization in the environment where it receives radiant heat, making it impossible to wind on a reel etc. and unsuitable for reuse, or movable parts such as working robots There is a problem that can not be used for Therefore, although it is useful to improve heat resistance, it is desirable to improve resistance to radiant heat as well.

  The present invention solves the problems described above, and an object thereof is to provide an electric cable and a working robot capable of improving radiation heat resistance performance.

  In order to achieve the above-mentioned object, an electric cable according to one aspect of the present invention comprises: an electric core, and a coating disposed on the outermost layer surrounding the outer circumference of the electric core and having an infrared reflectance of 80% or more. Prepare.

  Moreover, in the electric cable according to one aspect of the present invention, the film is preferably silver.

  Moreover, in the electrical cable according to one aspect of the present invention, the film is preferably an aluminum paste.

  In the electrical component cable according to one aspect of the present invention, the electrical component cable further includes a protective layer disposed between the electrical component core material and the film, surrounding the outer periphery of the electrical component core material, and provided with the film on the external surface. Is preferred.

  In the electric cable according to one aspect of the present invention, the protective layer is a tensile fiber layer made of aramid fibers surrounding the outer periphery of the electric core, and an outer layer made of a flame retardant non-halogen material surrounding the outer periphery of the tensile fiber layer. It is preferable that the coating is applied to the outer peripheral surface of the outer layer.

  In order to achieve the above-mentioned object, in a work robot according to one aspect of the present invention, the electrical cable according to any one of the above is applied to a movable portion.

  According to the present invention, it is possible to improve the radiation heat resistance performance that can withstand use in an environment that receives radiant heat and that is movable or slid.

FIG. 1 is a schematic cross-sectional view of an electrical cable according to an embodiment of the present invention. FIG. 2 is a chart showing the results of the performance test of the electrical component cable according to the embodiment of the present invention. FIG. 3 is a chart showing the results of performance tests on coatings of electrical cables according to an embodiment of the present invention. FIG. 4 is a schematic perspective view showing an application example of the electrical component cable according to the embodiment of the present invention. FIG. 5 is a schematic view showing an application example of the electric component cable according to the embodiment of the present invention.

  Hereinafter, embodiments according to the present invention will be described in detail based on the drawings. The present invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by persons skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic cross-sectional view of an electric cable according to the present embodiment.

  As shown in FIG. 1, the electric cable 1 of the present embodiment includes an electric core 2, a protective layer 3, and a coating 4.

  The electric core 2 forms a long optical fiber core wire constituting a communication cable in the present embodiment. There are single mode type and multi mode type (for example, graded index type [GI]) as the electric core 2 forming the optical fiber core. In the case of the single mode type, for example, there are those having a mode field diameter of 8.6 to 9.2 ± 0.4 μm and a cladding diameter of 125.0 ± 0.5 μm. Further, in the case of the multi-mode type, for example, the core diameter is 50.0 ± 3 μm or 62.5 ± 3 μm, and the cladding diameter is 125.0 ± 3 μm. The electric core 2 forming the optical fiber core is not limited to such a configuration. Further, although not clearly shown in the figure, the electric core 2 is provided with a buffer layer made of an ultraviolet curable resin on the outer periphery of the clad, and further provided with a cover layer made of flame retardant polyethylene on the outer periphery of the buffer layer. The electric core 2 has an outer diameter of about 0.25 mm for the buffer layer and an outer diameter of about 0.9 ± 0.1 mm for the cover layer, and the outer diameter shown by D1 in FIG. There is. In addition, the electrical connection core 2 may be a core wire constituting a communication cable other than the optical fiber core wire. In addition, the electrical connection core 2 may be a core wire constituting a power supply cable other than the communication cable.

  The protective layer 3 is provided so as to surround the outer periphery of the electrical core 2. The protective layer 3 has a tensile strength fiber layer 3A and an outer layer 3B. The tensile strength fiber layer 3A is made of aramid fiber, and is provided along the length direction of the electric core 2 so as to surround the outer periphery of the optical fiber core wire in the optical fiber cable. The outer layer 3B is made of a flame-retardant non-halogen material, surrounds the outer periphery of the tensile strength fiber layer 3A, and is provided along the longitudinal direction of the electric core 2. The non-halogen material does not contain halogen (which indicates the five elements of fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At)). The non-halogen material is, for example, a resin composition in which a flame retardant such as a metal oxide is added to a polyolefin resin (polyethylene etc.). That is, a non-halogen material is one that has removed a halogen that generates a highly toxic and corrosive hydrogen halide gas (hydrogen fluoride gas, hydrogen chloride gas, hydrogen bromide gas) in combination with hydrogen when burned. Even if it burns, generation of harmful gas is eliminated. The outer layer 3B may be PVC or the like which is not a non-halogen material (however, a non-halogen material is preferable). The layer thickness of this protective layer 3 indicated by D2 in FIG. 1 is, for example, 2.0 mm. The protective layer 3 configured in this manner ensures the flexibility of the core 2, has flame retardancy, and protects the core 2 from external force. Here, the term "flexibility" means that the allowable bending radius is 15 N or less and the allowable bending radius is 15 mm or more. Moreover, flame retardance is not spreading fire in the horizontal test based on JIS C 3005, but natural extinction is carried out.

  The coating 4 surrounds the outer periphery of the protective layer 3 and is provided along the length direction of the electrical core 2. The film 4 is applied to the outer peripheral surface of the protective layer 3 as a paint film. The film 4 is composed of a silicon resin, a pigment and a solvent. The pigment is a powder of an aluminum alloy, so the coating 4 is configured as a painted film coated with an aluminum paste. The composition forming the film 4 is preferably, for example, 14.0 wt% of a silicone resin, 14.0 wt% of a pigment, and 72.0 wt% of a solvent. And the composition which makes the film 4 becomes uniform without a hard lump when it stirs in the state in the container based on JISK5600-1-1 in the liquid state before applying to the electric cable 1. As shown in FIG. Moreover, the composition which forms the film 4 is 28.0 +/- 2.0% in the heating residue (180 degreeC x 40 minutes) based on JISK5601-1-2. Moreover, the composition which forms the film 4 has a drying time which is anti-curing at 20 ° C. within 1 hour. Further, in the state where the composition forming the film 4 is applied to the electrical cable 1 as a coating film and dried, no swelling or peeling is found even after 3 hours at 300 ° C., and the appearance of the coating film does not change significantly . The coating 4 has an infrared reflectance of 80% or more. Specifically, the film 4 has a silver color (grayish-white: shirogane color), and because it is an aluminum paste, it reflects infrared rays at the above-described reflectance. The film 4 is a coating film on the outer peripheral surface of the protective layer 3 (outer layer 3B), and the film thickness indicated by D3 in FIG. 1 is 6 μm or more.

  FIG. 2 is a chart showing the results of the performance test of the electric cable according to the present embodiment.

  In the performance test shown in FIG. 2, the performance test regarding the radiation heat resistance performance and the endurance performance was conducted for a plurality of types of electric cables under different conditions.

  In this performance test, the electric cable of the configuration of the present embodiment having the film 4 is taken as an example, and the electric cable having a yellow outer surface with the protective layer 3 exposed without the film 4 is taken as the comparative example 1, An electric cable of a configuration in which aluminum foil is wound instead of 4 is used as Comparative Example 2, and an electric cable of a configuration in which white coating with a heat resistant paint is used instead of the coating 4 is Comparative Example 3.

In the performance test of radiation heat resistance performance, radiation heat (20 kw / m ² ) assumed in a fire was irradiated for a certain period of time (45 minutes) by vertically hanging and arranging each electrical component cable at a predetermined distance from the heater. . Then, after the test, the appearance was observed, and the influence on the function was evaluated by the presence or absence of loss due to light measurement.

  In the performance test of durability performance, after the performance test of radiation heat resistance performance, use an iron board edged with R5 and R3 at the edge of the iron plate respectively, and 90 each electric cables for the edge of each iron board. Press so as to bend each time, and reciprocate in the longitudinal direction for ironing. The number of times of ironing (one round trip) was performed 100 times and 200 times with the R5 ironing board, and was performed 100 times, 200 times, 300 times and 350 times with the R3 ironing board. And the change of the state of the surface was observed after the test. In addition, since it turned out that the electrical component cable of the comparative example 2 of the structure which replaced with the film 4 and wound aluminum foil is not suitable for movement and a sliding, the performance test of durability was not done.

And as shown to the test result of FIG. 2, it turns out that the electrical component cable of the Example can ensure the radiation heat resistance performance and durability performance with respect to Comparative Example 1-Comparative Example 3. FIG. Therefore, it can be seen that the electrical component cable of the present embodiment can withstand an environment to which radiant heat (20 kw / m ² ) assumed in a fire is irradiated.

  FIG. 3 is a chart showing the results of performance tests on the coating of the electrical cable according to the present embodiment.

In the performance test shown in FIG. 3, the electric cable of the configuration of the above-described embodiment having the coating 4 is taken as an example, and radiation heat (20 kw / m ² ) assumed in a fire is irradiated for the example, and the measurement temperature 300 The infrared emissivity of the measurement wavelength (2.5 to 25 μm) was measured under certain conditions of ° C. The emissivity is an integrated emissivity of the measurement wavelength (2.5 to 25 μm).

  And as shown to the test result of FIG. 3, since the integral emissivity of the electrical component cable of the Example is 19.6%, it turns out that the reflectance of infrared rays is 80% or more. The transmitted 20% infrared radiation (radiant heat) is absorbed by the protective layer 3 and does not affect the electrical core 2.

  FIG. 4 and FIG. 5 are schematic views showing application examples of the electric component cable according to the present embodiment.

  The electric cable 1 according to the present embodiment is assumed to be applied to a working robot used in the event of a fire, and needs to be able to withstand use in an environment which receives radiant heat and is movable or slid. Do.

  As a work robot, those shown in FIG. 4 and FIG. 5 can be mentioned as an example. The working robot shown in FIG. 4 is disclosed in Japanese Patent Laid-Open No. 2015-205125, and is operated by interlocking the water discharge carriage 11 and the hose carriage 12 from the water supply area A2 to the water discharge area A3 by remote control. 11 is disposed in the water discharge area A3 and the hose car 12 is caused to travel to the water supply area A2 while feeding out the hose 32. Thereafter, the hose 32 is removed from the hose car 12 and connected to the pump car 13 in the water supply area A2. The water discharge carriage 11 and the hose carriage 12 travel on the road avoiding the building B in the water supply area A2, and move to the water discharge area A3. The water discharge area A3 is a water discharge target C, and is, for example, a fire site in a high-temperature atmosphere, a site with a risk of explosion, a site that is a radiation contaminated area, and a site where workers are difficult to approach. In such a working robot, since signals and power necessary for remote control are sent to the water discharge carriage 11 and the hose carriage 12 by the electric cable of the present embodiment, the environment where the working robot receives radiant heat in a fire etc. It must be able to withstand use in moving or sliding environments.

  The working robot shown in FIG. 5 is disclosed in JP-A-2016-049864, and includes a traveling vehicle 111 capable of traveling on the ground, a helicopter 112 capable of flying in the air, a traveling vehicle 111 and a helicopter 112. A traveling vehicle 111 and a helicopter 112 are connected by an electric cable 114 capable of supplying power and transmitting / receiving a signal between the two. The helicopter 112 is provided with a camera, and appropriately secures a visual field in which the traveling vehicle 111 travels from an image captured by the camera. In such a working robot, since the traveling vehicle 111 and the helicopter 112 are connected by the electric cable 114 between them, it is an environment that receives radiant heat in which the working robot is used in a fire etc. Need to be able to withstand use in

  As described above, the electric component cable 1 of the present embodiment includes the electric component core material 2 and the coating 4 disposed on the outermost layer surrounding the outer periphery of the electric component core component 2 and having an infrared reflectance of 80% or more. As a result, it is possible to improve the radiation heat resistance performance that can withstand use in an environment that receives radiant heat and that is movable or slid.

  Further, in the electric component cable 1 of the present embodiment, the film 4 is preferably silver. Thus, it is possible to secure the performance of the infrared reflectance of 80% or more.

  Moreover, in the electric cable 1 of the present embodiment, the film 4 is preferably an aluminum paste. Thus, it is possible to secure the performance of the infrared reflectance of 80% or more.

  Moreover, in the electric cable 1 of the present embodiment, the film 4 is preferably made of a coated film having a thickness of 6 μm or more. This makes it possible to withstand a performance test of durability performance. That is, durability performance can be secured.

  Moreover, in the electric cable 1 of the present embodiment, the electric cable 1 further includes the protective layer 3 disposed between the electric core 2 and the coating 4 and surrounding the outer periphery of the electric core 2 and having the coating 4 on the outer peripheral surface. preferable. Thereby, the radiation heat resistance performance can be improved by the protective layer 3 in synergy with the improvement of the radiation heat resistance performance by the film 4.

  Further, in the electric cable 1 of the present embodiment, the protective layer 3 is an outer layer made of a tensile fiber layer 3A made of aramid fibers surrounding the outer periphery of the electric core 2 and a flame retardant non-halogen material surrounding the outer periphery of the tensile fiber layer 3A. 3B, and preferably the coating 4 is applied to the outer peripheral surface of the outer layer 3B. As a result, an effect that can withstand use in an environment that receives radiant heat and that is movable or slid can be more significantly obtained.

  Further, according to the working robot in which the electric component cable 1 of the present embodiment is applied to the movable portion, the electric component cable 1 withstands use in an environment where it receives radiant heat in a fire or the like and is movable or slid. From the point of view, the use of a working robot in such an environment can be realized.

1 electric cable 2 electric core 3 protective layer 3A tensile strength fiber layer 3B outer layer 4 coating

Claims (6)

Electric core material,
A coating disposed on the outermost layer surrounding the outer periphery of the electric core and having an infrared reflectance of 80% or more;
Electrical cable equipped with   The electrical cable according to claim 1, wherein the film is silver.   The electrical cable according to claim 1, wherein the film is an aluminum paste.   The electrical component according to any one of claims 1 to 3, further comprising a protective layer disposed between the electrical component core and the coating, surrounding the outer periphery of the electrical component core, and provided with the coating on the outer peripheral surface. cable.   The protective layer has a tensile fiber layer made of aramid fibers surrounding the outer periphery of the electric core, and an outer layer made of a flame retardant non-halogen material surrounding the outer periphery of the tensile fiber layer. The electrical cable according to claim 4, wherein a coating is applied.   A working robot, wherein the cable according to any one of claims 1 to 5 is applied to a movable portion.

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