JPH04488Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an electromechanical cable used to exchange signals between an unmanned aircraft for seabed survey, seabed monitoring, etc. and a control device on a mother ship. The present invention relates to the structure of a tether cable, and particularly to a tether cable suitable for reducing the outer diameter of the cable.

[Conventional technology]

A tether cable is installed between an unmanned vehicle such as an unmanned underwater vehicle for undersea development and a control device on the mother ship.
Cable) will be installed to send and receive signals.

FIG. 5 shows a cross-sectional structure of a tether cable 1 commonly used in the past.

In the center thereof, a plurality of power lines 3 (three in the figure) covered with an insulating material 2 and a plurality of signal lines 5 (three sets in the figure) bundled together with an inclusion 4 are arranged. The power line 3 and the signal line 5 are twisted at appropriate pitches to form the core of the cable. The twisted power line 3 and signal line 5 are covered by an inner sheath 6.
covered by. The inner sheath 6 is a jacket for preventing seawater from entering the core.
Since the tether cable 1 needs to be formed to have a specific gravity almost the same as seawater, the inner sheath 6 is formed from a material with a specific gravity lower than 1.0, such as ethylene propylene rubber (EPR) or thermoplastic rubber (TPR). be done.

A strength member 7 is provided on the outer circumferential side of the inner sheath 6 to cover it. The strength member 7 is for maintaining the tensile strength, etc. of the tether cable 1 at a predetermined value, and is formed by braiding strands onto the inner sheath 6. Here, polyamide-based chemical fibers having low specific gravity and high strength are used for the wires.

An external sheath 8 is provided on the outside of the strength member 7 to cover it. Note that the outer sheath 8 is generally made of substantially the same material as the inner sheath and has the same function as the inner sheath.

FIG. 6 shows the longitudinal shape of a conventional tether cable 1 in which each layer is exposed stepwise. 7th
The figure is an enlarged view of the braided state of the strength member 7. In this case, the strands 7a and 7b are tightly braided, with no gaps or the like formed therebetween. FIG. 8 shows a cross section taken along the - arrow in FIG. 7, and the inner sheath 6 and the outer sheath 8 are separated by a strength member 7.

If a flaw occurs in the outer sheath 8 of the conventional tether cable 1 configured as described above, seawater infiltrates into the interior through the flaw and reaches the strength member 7. Since the strength member 7 is formed in a braided shape as described above, when seawater comes into contact with the strength member 7, water splashes occur, and the seawater intrudes over the entire length of the strength member 7. This increases the specific gravity of the tether cable 1, making it unusable. In order to prevent this, conventional technology has adopted a method of increasing the thickness of the outer sheath 8, but this increases the outer diameter of the tether cable 1, making it susceptible to the effects of tidal currents and ocean currents during use. There was a drawback that it became easier.

[Problem that the invention attempts to solve]

The present invention is intended to solve the above-mentioned drawbacks, and its purpose is to provide a tether cable whose specific gravity does not change even when seawater etc. enters, which can be made smaller in diameter, and which can be used in sea areas with strong tidal currents and ocean currents. There is a particular thing.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention has been developed by forming a flat wire into a rough shape with a void, the outer circumferential side of which is covered with an extremely thin jacket, of an inner sheath that envelops a core consisting of a power line and a signal line. The problem is solved by a tether cable formed by covering a braided strength member, encasing the strength member with an outer sheath, and integrally connecting the inner sheath and the outer sheath through the gap. It was used as a means of

[Effect]

As mentioned above, the strength member is covered with a jacket and is interposed between the outer sheath and the inner sheath, and the outer sheath and the inner sheath are integrally connected, so it is as if the strength member in the form of a wire is inside the sheath. The structure is such that even if seawater enters through the scratches in the outer sheath, water does not splatter and seawater does not enter in the longitudinal direction of the strength member. Therefore, the specific gravity does not change and there is no need to increase the wall thickness of the outer sheath.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 1 shows tether cable 1 with the same content as Figure 6.
The figure shows the shape in the longitudinal direction, but the strength member 7' is different. That is, as shown in FIG.
It is formed by coarsely braiding a jacket 9 made of extremely thin vinyl with a thickness of about 0.1 mm to 0.1 mm. The material of the strands 7a' and 7b' is made of a polyamide chemical fiber having a low specific gravity and high strength, as in the prior art. The reason why the wires 7a' and 7b' are covered with the jacket 9 is that the braiding process cannot be performed smoothly without the jacket 9, and the jacket 9 covers the wires 7a' and 7b.
This is due to the fact that strength deterioration due to wear of b′ is prevented. Further, the reason why the coating is made thin is to make the outer diameter of the tether cable 1 as small as possible.

As shown in FIGS. 3 and 4, the jacket 9
When the strands 7a' and 7b' coated with the strands are roughly braided, a void 10 is formed. Therefore, the core is covered with the inner sheath 6, the wires 7a' and 7b' are placed on the outer side of the inner sheath 6, and the outer sheath 8 is covered with the strength member 7' while applying an appropriate pressure within an appropriate time. When the outer sheath 8 is wrapped around the outside of the cavity 1
0 to the inner sheath 6, and the outer sheath 8 and the inner sheath 6 are integrated. On the other hand, the thin vinyl composing the jacket 9 may be partially attached to the inner and outer sheaths, but not integrated by welding. The purpose of the vinyl is to prevent wear caused by direct sliding between the Kevlar 7a' and 7b' when they are moved. From a different perspective, it appears as if a strength member 7' is interposed between the outer sheath 8 and the inner sheath 6 which are integrated.

As a result of the above, even if the outer sheath 8 is damaged and the damage reaches the strength member 7', water does not bleed over the entire length of the tether cable. Therefore, as described above, the specific gravity of the tether cable 1 does not change, and the outer sheath 8 only needs to have a minimum thickness, making it possible to reduce the outer diameter of the cable.

[Effect of idea]

As is clear from the above explanation, according to the present invention, the specific gravity does not change due to the intrusion of seawater, and the outer diameter of the cable can be reduced, making it possible to use it in sea areas with strong tidal currents and ocean currents. is raised.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the exposed shape of each layer in the longitudinal direction of a cable according to an embodiment of the present invention, Fig. 2 is a sectional view showing details of the strands forming the strength member, and Fig. 3 is a diagram showing the details of the strands forming the strength member. A partially enlarged view showing the details, Figure 4 is a sectional view taken along the - line in Figure 3, Figure 5
The figure is a cross-sectional view of a conventional tether cable, Figure 6 is an explanatory diagram of the same content as Figure 1 of the conventional tether cable, Figure 7 is a partially enlarged view showing details of the strength member in the conventional technology, and Figure 8 The figure is a sectional view taken along the - arrow in FIG. 1...Tether cable, 2...Insulating material, 3...
Power line, 4...Inclusion, 5...Signal line, 6...Inner sheath, 7, 7'...Strength member, 7a, 7
b, 7a', 7b'...Element wire, 8...Outer sheath, 9
... Jacket, 10 ... Void.

Claims (1)

[Scope of utility model registration request] A combination of multiple power lines and signal lines twisted together.
It is covered with an inner sheath made of a material having a specific gravity smaller than 1.0, further covered with a strength member made of braided wires, and the strength member is covered with an outer sheath made of substantially the same material as the inner sheath. In the tether cable, the strength member is formed by braiding flat strands covered with an extremely thin jacket into a coarse braid having a gap, and the inner sheath and the outside are connected through the gap. A tether cable characterized in that it is formed to be integrally adhesively bonded to a sheath by heat molding.