JPH02155129A - Manufacture of armored cable wound with fiber reinforced plastic wire - Google Patents

Abstract

PURPOSE:To eliminate the fear of occurrence of any crack, breakage and disconnection due to residual strain by winding fiber reinforced plastic wires around the outer periphery of an electric cable core in a spiral after heating up to the fixed temperature at which the self-heating thereof is started to be hardened, thus obating the aromored cable wounded with the fiber reinforced plastic wires perfectly hardened by the self-heating. CONSTITUTION:Prior to the winding around the outer periphery of an electric cable core in a spiral, fiber reinforced plastic wires, which is not perfectly hardened, are heated up to the fixed temperature at which the self-heating is started to be hardened. Thereafter, the wires are wound around the outer periphery of the electric cable core in a spiral. With this arrangement, since there remains such a flexibility as being necessary for winding even if the hardening of the fiber reinforced plastic wires is progressed so that it is possible to perform the winding around the electric cable core with a sufficient winging force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing an electrical cable, which comprises a fiber-reinforced plastic wire sheath as a high-strength body of the electrical cable core and as protection from external forces.

[Conventional technology] FS T and M marine equipment such as underwater observation equipment and submarine working machines in marine development projects are connected to support facilities on land or at sea via electric cables in order to supply power to them and send and receive signals. are connected. This electric cable is also used for suspending and hoisting marine equipment6, and for these reasons, this type of electric cable has the role of a tensile strength body during hanging and hoisting, and as protection from external mechanical forces. It is equipped with a wire cover that fulfills the purpose.

Conventionally, jI! was used as the above wire armor. The mainstream was to use one line, but ij! When it comes to long marine/TJ cables, the weight of the armored steel wires becomes a big burden, causing problems in handling the cables and marine 1W equipment, so recently cables made of fiber-reinforced plastic striae with a low specific gravity have been used. Armor is used.

Methods for applying fiber-reinforced plastic wire sheathing to the outer periphery of electric cables include wrapping a completely cured reinforced plastic wire around the outer periphery of the electric cable, or when the plastic wire is relatively thick. A method is known in which a fiber-reinforced PlusDeck filament in which the resin impregnated into the fiber M is uncured or semi-cured is wound around the outer periphery of an electric cable and then heated to completely cure the fiber.

[Problems to be Solved by the Invention] In the above-mentioned method of wrapping a reinforced plastic filament that has been completely prepared in advance around the outer periphery of an electric cable, when the filament becomes large in size, it becomes difficult to wrap the filament. Then, cracks occur due to the strain remaining in the filament Ω[11, and the reinforced plastic filament eventually breaks or breaks.

In the other method described above, that is, a method in which an uncured or semi-cured fiber-reinforced plastic filament is wound around the outer circumference of an electric cable and then heated for curing.
In order to harden the fiber-reinforced plastic striae wrapped around the cable by heating it from room temperature, the heating temperature and heating time of the fiber-reinforced plastic striae on the cable are considerably large, and therefore the electrical cable core As a result of prolonged exposure to the temperatures required for said curing, there has often been the risk of adverse thermal effects on the electrical cable core.

[Means for Solving the Problems] The manufacturing method of the present invention has been made in order to solve the problems in the conventional manufacturing methods described above, and is to process a fiber-reinforced plastic filament that has not yet been completely cured into an electric cable core. Prior to wrapping the material in a spiral shape around the outer circumference of the material, the material is preheated to a temperature at which self-heating for curing begins at 1111.
Thereafter, it is wound spirally around the outer periphery of the nq-shaped filament electrical cable core to form a wire sheath that is completely hardened by self-heating.

[Operation] The fiber-reinforced plastic strand, which has not yet been completely cured, is heated to a temperature at which it starts self-heating for curing, before being wound around the electric cable core. Even if external heating is turned off, the filament continues to harden due to self-heating.

Furthermore, the electric cable core around which the filament is wound only receives heat due to self-heating of the filament, and is not subjected to artificial heating by external heating means. The amount of heat it receives is extremely small, and the time it is exposed to high temperatures for curing is also extremely short.

Further, although the filament is considerably hardened in the direction of being wound around the cable core, it is not yet completely hardened, so that it still has sufficient flexibility for winding. be.

[Example〕 Embodiments of the invention will be described with reference to the drawings.

2 is an electric cable core, 2 is a fibre-reinforced plastic strand that is not yet completely cured and is wrapped around the outer circumference of the cable core 1, 3 is a preheating tube, 4 is a main heating tube, 5 is an electric cable core guide tube, 6 is a twisted die. The plastic filament 2 is unwound from a bobbin loaded in a main body of a twisting machine (not shown), and is advanced from right to left in the drawing. The cable core I is unwound from a bobbin (not shown) and rotated around the direction in which it moves from right to left in the drawing inside the electric cable core guide tube 5 provided at the center of the main body of the twisting machine. It will proceed.

The plurality of plastic filament bodies 2 that are fed out from the main body of the twisting and binding machine are electrical cable core guides 1? ! It advances through the preheating cylinder 3 arranged around j5 as the center, and is wound around the outer periphery of the cable core ■ on the left side in the drawing.

The left end of the preheating cylinder 3 is connected together to the main heating cylinder 4. A twisting die 6 is provided at the left end of the main heating tube 4, and the cable core 6 that has progressed through the guide tube 5 is used here.
On the outer periphery of the preheating cylinder 3, main heating r! The plastic filament 2 that has progressed sequentially through I4 is wound around. The plastic filament 2 passed through the twisting die 6 and wound around the cable core I soon becomes a completely hardened wire sheath 20, completing the fiber-reinforced plastic wire sheathed cable IO. Reference numeral 7 denotes a heat medium partition wall provided between the preheating cylinder 3 and the main heating cylinder 4, 8 a heat medium sealing cap for the plastic filament 2 to penetrate through the partition wall 7, and 9 a plastic filament. The media sealing cap at the entrance where body 2 enters inside #1 and 3! 1.12 is an injection port for injecting the preheating medium 17 into the preheating cylinder 3 and an injection port for injecting the main heating medium 18 into the main heating cylinder 4; 13 and +4 are the preheating medium 17 and the main heating medium! 8 is a discharge port, and +5 is a gasket that seals the gap between the cable and the reinforcement cable provided inside the twisting die 6. 6
is a gasket that seals the gap between the guide rf 45 and the electric cable core 1 provided at the left end. It is desirable that the left end of the guide tube 5 be close to the twisting die 6 to the extent that it does not hinder the progress of the plastic filament 2 being wrapped around the cable core j. heart! This is to minimize the time during which the main heating medium +8 is exposed to the high temperature main heating medium +8 after entering the main heating cylinder 4.

Now, the manufacturing method of the present invention uses, as a fiber-reinforced plastic strand, an aramid fiber impregnated with an uncured unsaturated polyester resin and a nylon strand with an outer diameter of 4 mm. An example will be described.

This aramid fiber-reinforced PlusDeck filament body 2 is advanced in a preheating cylinder 3 so that it is exposed to a 90°C preheating medium +7 for about 60 seconds, and then in a water-added S cylinder 4 for 120 seconds.
℃ real heating medium! 8 for about IO seconds.

In this way, the filament 2 starts to self-heat (this temperature is known as the kick-off temperature) when it reaches around 110°C near the entrance of the twisting die 6, and exits the exit of the die 6 to the outside. After the heating was released, the curing reaction rapidly progressed and reached 140'ctr of the peak for about 10 seconds, and it was completely cured in no time, thus completing the manufacturing method of the present invention. do.

In addition, the above-mentioned reinforced plastic filament 2 made of aramid fibers did not harden even after being heated for 30 minutes or more at 90°C in the main heating cylinder 4, and the curing reaction occurred in 90 seconds in the main heating cylinder 4 at 100°C. The process started and reached a semi-cured state in about 120 seconds, but when the external heating was released at that point, it remained incompletely cured.

In addition to the above, the fiber-reinforced plastic filaments used in the manufacturing method of the present invention include glass fibers, polyester fibers, polyamide fibers, carbon 1a fibers, ultra-high tensile polyethylene fibers, epoxy resins, phenol resins, alkyd resins, etc. It is possible to use a material impregnated with a silicone resin or the like and hardened. Also, the term "cured" here includes cross-linking, and the fiber-reinforced PlusDeck strands before being wound around the cable core 1. For example, it is not completely cured, and the winding only needs to be flexible enough for the work. Therefore, it includes not only the case where the case is not completely cured but also the case where the case has been considerably cured. Saralgo, c?
As the layer, nylon plane, polyvinylidene fluoride, polyether ether ketone, tetrafluoroethylene-hexafluoropropylene copolymer, etc. can be used, and this is because the inner fiber-reinforced plastic striae comrades This is to prevent the filaments from adhering to each other when they are heated and hardened, and to protect the striae from external forces. However, depending on the material of the striae, the material itself can prevent adhesion. If it has a protective nature, this protective shield does not necessarily have to be provided.

Yet another preheating medium! 7 and the main heating medium I8 may be hot water, steam, silicone oil, paraffin, polybutene oil, etc., as well as hot air or electric heating.

"Effects of the Invention" According to the manufacturing method of the present invention, a fiber-reinforced plastic strip that has not yet been completely cured is used,
Prior to spirally wrapping the filament around the outer periphery of the electric cable core, it is preheated to a temperature at which self-heating for curing begins, and then the filament is wrapped around the electric cable core. A# Because the mta-reinforced Plus Deck striatum is laid out in a pattern, even though it has hardened considerably, it still remains flexible to the extent that it does not interfere with wrapping, so it is difficult to wrap it around the electrical cable core. Sufficient tightening allows wrapping with a force of 6, and also prevents cracks from occurring due to residual strain.
There is no fear of breakage or disconnection.

Furthermore, the electrical cable core is not subjected to any heating action until immediately after the fiber-reinforced PlusDeck strands are wound thereon, and then the strands are heated for a short period of time due to self-heating of the strands. Therefore, there is no need to worry about the possibility of adverse thermal effects on the constituent materials of the cable core.

[Brief explanation of the drawing]

The drawing shows an example of a situation in which the method of the present invention is implemented, and is a partially vertical side view of the main part of the apparatus used. 1: 7ff air cable core, 2: uncured fiber-reinforced plastic striae, 3: preheating tube, 4: main heating section,
5:? ! ! Cable core guide shaft, 6; Twisting die, 7
: Partition wall, 8.9: Heat medium sealing cap, 10; Fiber-reinforced plastic wire armored cable, 11, +2. Heat medium inlet, +3.1a; heat medium outlet, +5.16; packing;
17. Preheating medium, 18; main heating medium, 20; fully cured LA fiber reinforced plus deck wire armor.

Claims (1)

[Claims] Before the fiber-reinforced plastic filament, which has not yet been completely cured, is helically wound around the outer periphery of the electric cable core, it is preheated to a temperature at which self-heating begins for curing, and then the filament is heated. A method for manufacturing a fiber-reinforced plastic wire-inserted cable, characterized in that the fiber-reinforced plastic wire-inserted cable is wound spirally around the outer periphery of an electric cable core, and the wire is completely hardened by self-heating.