JPH046095Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a portable flat electric cable that includes an optical cable and an electric cable.

When operating industrial mobile machines such as container cranes, stacker cranes for unloading coal, etc., or reclaimer cranes, there is a control cable that connects the mobile machine and a remote control room along with a power supply cable to the mobile machine. Since these cables are wound around reels attached to moving machines, they have a rectangular cross section and are generally referred to as mobile flat electrical cables. .

By the way, the signal transmission cable is used by being wound on a separate reel at a distance of at least a certain distance from the power supply cable in order to avoid induction interference from the power supply cable.

However, in recent years, optical cables have been developed, and since these cables are completely free from inductive interference, research is underway to develop cables that can be installed alongside power cables or integrated with power cables, and some have even been put into practical use. ing.

Similarly, there has been proposed a flat electric cable for moving with an optical cable in which three power supply cables and an optical cable are arranged in parallel, and the outside of the cable is covered with cabtyre rubber or the like.

A typical example is shown in FIG. As shown in the figure, three electrical cables 3 coated with ethylene-propylene rubber insulators 2 are arranged in parallel on the outside of a twisted conductor 1 of tin-plated annealed copper wire, and a rubber hose 4 is inserted between the electrical cables 3 and 3'. A moving flat electric cable a containing an optical cable is known, in which an optical cable 5 is arranged side by side, housed inside the rubber hose 4, and the entire optical cable is covered with a sheath 6 such as chloroprene rubber.

However, since such cables have optical cables arranged in parallel with electrical cables,
The width of the entire cable, that is, the major axis, increases by the diameter of the rubber hose that houses the optical cable, making it larger than the width of the existing reel for flat cables in which only electrical cables are arranged in parallel, so there is a drawback that the existing reel cannot be used. For this reason, the above-mentioned conventional moving flat cable containing an optical cable is limited to newly installed cranes, and its widespread use has been delayed.

The present invention was developed as a result of intensive research in view of the current situation, and is a portable flat type optical cable containing an optical cable that has almost the same long diameter as a flat electric cable for power supply and can be used by being wound onto the existing reel of a crane. The aim is to provide electrical cables.

That is, the present invention provides a mobile flat cable in which multiple electric cables are arranged in parallel and the outside is covered with rubber or plastic.
An optical cable-containing transport characterized in that the optical cable is housed inside a flexible tubular body or spring coil-shaped body made of a non-magnetic material provided at the center of the conductor of at least one of the electric cables in the longitudinal direction of the conductor. This is a flat type cable for use.

Next, the present invention will be explained using the drawings.

FIG. 2 shows a cross-sectional view of a moving flat electric cable A containing an optical cable, which is an embodiment of the present invention.
In the figure, 11 and 11' are copper stranded conductors, 12 is an insulator made of ethylene-propylene rubber, etc.
13 and 13' are electric cables, 13'' is an electric cable with a built-in optical cable, 14 is a flexible tubular body or spring coiled body made of a non-magnetic material, 15 is an optical cable, and 16 is a sheath such as chloroprene rubber.

As shown in the figure, the cable A of the present invention includes a twisted copper conductor 11' twisted on a flexible tubular body or spring coiled body 14 made of a non-magnetic material.
An insulator 12 is coated on the copper stranded conductor 11 on both sides of an electric cable 13'', which is formed by covering an insulator 12 thereon and storing an optical cable 15 inside the flexible tubular body or spring coiled body 14. Electric cables 13, 13' are arranged in parallel, and the cables 13, 13', 13'' are collectively
6.

Since the electric cables 13, 13', 13'' are three-phase AC cables, it is necessary to make the conductor cross-sectional area the same in all cables, so the outer diameter of the conductor 11' of the electric cable 13'' is The diameter is slightly larger than the diameter of the conductor 11 of the electric cables 13, 13'. However, the difference is small, and the long axis (width) of the invented cable A is within the tolerance range of the long axis of conventional three-phase AC flat electric cables that do not have built-in optical cables, and can be used as is on existing reels. can.

For example, the long diameter of a conventional, common flat electric cable for movable use is 82.0 mm, which is made by arranging three electric cables each having an outer diameter of 23.2 mm in parallel and covering the outside with a sheath. On the other hand, the inner and outer diameters of the flexible tubular body or spring coiled body 14 that accommodates the optical cable 15 with an outer diameter of 6 mm are each 8.0 mm.
and 9.5 mm, and the outer diameter of the conductor 11' formed thereon is 12.1 mm, and the outer diameter of the electric cable 13'' is 26.2 mm, and this cable 13'' and the outer diameter of 23.2
The long diameter of the cable A of the present invention is 85.0 mm, which is made by arranging the electric cables 13 and 13' of 1.5 mm in diameter adjacent to each other and covering the outside thereof with a sheath 16 having the same thickness as the conventional cable.

Therefore, although the conventional flat electric cable of the present invention has the same normal capacity as the flat electric cable of the present invention, the long diameter (width) of the cable is )
is only 3mm larger than conventional cables,
Moreover, since this increased value is within the range of the outer diameter tolerance of such a flat electric cable for transportation, it can be laid and used as is on an existing reel just like a conventional cable. This satisfies the need to replace most existing cranes with remote control systems using optical transmission signals in the near future, and the cable of this invention can use existing reels. No replacement is required, and the cost savings are significant.

In addition, in the present invention, the non-magnetic materials constituting the flexible tubular body or spring coiled body include metal materials such as stainless steel and copper alloy, as well as synthetic materials such as FRP that have excellent tensile strength and compressive strength. Resin materials can also be used. Magnetic materials such as iron are
Needless to say, it cannot be used because it causes so-called iron loss.

In addition, as the flexible tubular body, corrugated pipe,
There are bellows tubes and tubes made by wrapping non-magnetic material in the form of belts, and spring coil-like bodies include long bodies made by winding filaments of non-magnetic material in a helical shape. . In either case, the cable is made into a flexible tubular body or a spring coil-shaped body in order to make the entire cable easy to bend.

Although there are no particular limitations on the optical cable used in the present invention, it is preferable to use one as shown in FIG. That is, it has a tension member 17 in the center, around which optical fiber core wires 18 are twisted, a presser tape 19 is wrapped thereon, and polyethylene,
This is an optical cable provided with a sheath 20 made of cross-linked polyethylene or the like. The optical fiber core 18 generally has a buffer layer such as silicone rubber on the outside of the optical fiber and a reinforcing layer such as an FRP coating layer on the outside, but the present invention is not limited to this.

In addition, in the present invention, in order to house an optical cable in a flexible tubular body or a spring coiled body, the electrical cable is coated with a sheath that encloses the electrical cable, and after heat treatment such as vulcanization is completed, the optical cable is placed in a flexible tubular body. Preferably, it is drawn into a body or a spring-coiled body.

This is because when an optical cable is exposed to high temperatures during vulcanization, the plastic coating that makes up the optical cable expands and contracts due to the heat, and the distortion causes microbends in the optical fiber, resulting in so-called microbend loss.

Therefore, in the cable of the present invention, since the optical cable can be brought in and stored in the final process of cable manufacturing, it has the advantage that microbend loss due to heat does not occur.

As described above, in the portable flat electric cable containing an optical cable according to the present invention, a flexible tubular body or a spring coiled body made of a non-magnetic material is provided inside the conductor of the electric cable, and the optical cable is housed inside the flexible tubular body or spring coiled body. Therefore, even though it is a flat cable with an optical cable added, the major axis (width) of the flat cable is almost the same as the major axis of a conventional flat cable consisting only of a power supply cable. It can be installed and used as is on the existing reel of an existing crane that uses cables.

Furthermore, when manufacturing the cable of the present invention, the optical cable can be pulled in and stored after completing all processes involving heat such as the vulcanization process, so it also has the advantage that the characteristics of the optical cable will not be impaired.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional portable flat electric cable containing an optical cable, FIG. 2 is a cross-sectional view showing an embodiment of a portable flat electric cable containing an optical cable according to the present invention, and FIG. FIG. 2 is an enlarged sectional view showing an example of an optical cable used in the cable of the present invention shown in the figure. 1... Conductor, 2... Insulator, 3, 3', 3''...
Electric cable, 4...Rubber hose, 5...Optical cable, 6...Sheath, 11, 11'...Conductor, 1
2...Insulator, 13,13'...Electric cable,
13″...Electric cable with built-in optical cable, 14...
...Flexible tubular body or spring coiled body, 15
... Optical cable, 16 ... Sheath, 17 ... Tension member, 18 ... Optical fiber core wire, 19
...Pressure tape, 20...Sheath.

Claims (1)

[Scope of utility model registration request] In a mobile flat cable consisting of a plurality of electric cables arranged in parallel and the outsides of which are covered all at once with rubber or plastic, a cable is provided at the center of the conductor of at least one of the electric cables in the longitudinal direction of the conductor. 1. A moving flat electrical cable containing an optical cable, characterized in that the optical cable is housed inside a flexible tubular body or spring coil-shaped body made of a non-magnetic material.