JPS6114725B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for terminal processing of a multi-core cable, which is performed prior to core connection of the multi-core cable.

Conventionally, when connecting the cores of a multi-core cable, the sheath of the multi-core cable is first peeled off over a predetermined section from the end to expose each cable core. A so-called direct-pulling operation is performed to remove the twists from the cable cores, but direct-pulling work using current technology is considered difficult because the cable cores are closely spaced and it is difficult to remove the twists from the wire cores. There is. Furthermore, damage to other cables may occur during this work or subsequent work such as conductor connection or insulation treatment.
The current situation is that there are cases where damage is caused, and even more effort is required to repair the damage.

In addition, when the core connection is restored, it is unlikely that water will enter directly from the connection because the connection will be covered with a metal case, packing, waterproofing, etc. However, if a hole occurs in the cable sheath due to trauma. Water begins to enter through the opening, runs through the sheath, and eventually reaches the core connection area, posing the risk of causing a drop in the insulation of the connection area.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method that eliminates the drawbacks of the prior art and allows easy and reliable termination of multi-core cables.

That is, the present invention uses a pyramid-shaped body of an arbitrary shape, which is formed by integrally providing a plurality of pipe-shaped bodies in contact with the sides of the pyramid-shaped body and having a conductor embedded therein so as to penetrate through the pyramid-shaped body. , to directly pull out each cable core.

The material for the cone-shaped body may be rubber or plastic, but since it is required to function as a jig when pulling out the core directly, the hardness of rubber should be JIS hardness of 60° or higher, preferably 80°. ~100° is appropriate. In addition, stranded metal wires may be used for the conductor buried in the cone, but considering the water running between the strands, solid metal wires are more appropriate, and the method of arranging the wires closer to both ends of the wires is recommended. It's better.

Regarding the pipe-shaped body, if the cable core has a three-layer structure with an inner and outer semiconductive layer, the diameter of the cable core insertion hole is the outer diameter of the outer semiconductive layer, and the diameter of the inner semiconductive layer and the insulating layer. If it is a layered structure, the hole diameter may be equal to or slightly smaller than the insulating layer outer diameter, but if the insertion distance is long or if consideration is given to tolerance correction of the cable outer diameter, it is better to leave a margin in the hole diameter. .
The appropriate material is one that has heat shrinkability, and by the way, if you choose polyethylene (PE) as the material,
The pore diameter can be 4 times the outer diameter of the cable core, or 2 to 2.5 times for ethylene propylene (EP) systems. It is also possible to further enhance the waterproof effect by providing an adhesive layer on the inner surface of the insertion hole.

The present invention will be described below based on embodiments shown in the drawings.

First, the cone-shaped body used in carrying out this treatment method will be explained. FIG. 1 is a plan view of an embodiment of a cone-shaped body 1 for a three-core cable.
In the figure, 2 indicates a conical body, 3 a pipe-shaped body, 4 a cable core insertion hole, and 5 a buried lead wire. FIG. 2 is a cross-sectional view of FIG. 1 taken along the negative plane, and 6 in the figure indicates a metal body connected to the buried lead wire 5. As shown in FIG. FIG. 3 shows another example of the conical body 1 inserted into the end of a three-core, three-layer cable, where 10 is a three-core, three-layer cable, 11 is a cable shielding layer, and 12 is a three-core, three-layer cable. 13 indicates an outer semiconductive layer, 13 indicates an insulating layer, 14 indicates an inner semiconductive layer, and 15 indicates an extruded outer semiconductive layer. FIG. 4 is a diagram showing the completed connection of the cable core end portions, in which the cores to which the conical bodies are attached are connected to each other by a conductor connection tube 101, and then housed in a case 103 and resin 102 is injected and hardened. .

Next, a method for processing the terminals of a three-core cable using the above-mentioned cone-shaped body will be explained.

First, the sheath of the three-core, three-layer cable 10 is peeled off over a predetermined section from the end to expose each cable core. At this time, the length of the extruded external semiconductive layer to be accommodated within the pipe-like body 2 is made shorter than the length of the pipe-like body. In this state, each cable core is inserted into the insertion hole to a predetermined position.

Therefore, the shielding layer 11 bites into both ends of the insertion hole 4, and each cable core is directed outward along the inclination angle of the conical body 1. At this stage, the pipe-like body 2 is heated and shrunk to completely fix each cable core. Hereinafter, the connection between the lead wire 5 and the shielding layer 11 and the conductor connection of the cable core will proceed.

In addition, looking at these with respect to the cable layer, in a cable with a three-layer structure, there is no electrical problem because the shielding layer 11 and the outer conductor 12 communicate with each other.
In this sense, the pyramid-shaped body may be made of an insulating material. On the other hand, in a two-layer cable, the same effect as the external semi-conductor of the cable can be obtained by forming the pyramid-shaped body from a semi-conductive material. However, since the metal shielding layer is electrically connected to both three-layer and two-layer cables, if the lead wire 5 of the metal body 6 provided on the conical body is connected to the shielding layer 11, the cable can be electrically connected. can be made equivalent.

A pyramid-shaped body used in another embodiment of the invention is shown in FIG. This is to integrate a cable branch pipe 203 having a plurality of core branch holes 202 made of the same material as the heat-shrinkable main body 204 with the conical main body 201 between the branches, making full use of the heat-shrinkability. This has the advantage of reliably preventing fluids such as water from entering from the cable body side to the connection part side, and also has the advantage of preventing oil leakage when connecting dissimilar cables, especially OF cables and other cables. be.

In addition, when a heat-shrinkable material is used as the pipe-like body, the hole diameter can be made larger than the outer diameter of the wire core, which makes it easy to insert the wire core. By heat shrinking, the pipe-like body comes into close contact with the wire core, which prevents water from entering through the interface with the shielding layer or external semiconducting layer, and also fixes the wire core. The subsequent work can be done easily and reliably.

As described above, the present invention provides a method in which the work of directly pulling out each cable core during terminal processing of a multi-core cable can be carried out easily and reliably, and furthermore, there is no risk of damaging other cables during the above-mentioned work. Therefore, it can be said that its practical value is extremely large.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining one embodiment of the present invention, and FIG. 1 is a view of the cone-shaped body for a three-core cable used in the above embodiment, viewed from the radial direction. , Figure 2 is a cross-sectional view of it in the - plane, Figure 3 is a diagram of the pyramid-shaped body inserted into a three-core three-layer cable, Figure 4 is a diagram of the completed core connection of a multi-core cable, FIG. 5 is a diagram showing another cone body used in another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Cone-shaped body, 2... Cone-shaped body, 3... Pipe-shaped body, 4... Cable core insertion hole, 5... Lead wire, 6... Metal body, 10... Cable, 11...
Cable shielding layer, 12... External semiconducting layer, 13...
...Insulating layer, 14...Inner semiconducting layer, 15...Extruded outer conductive semiconducting layer, 101...Conductor connecting tube, 102...
...Insulating resin, 103... Connection case, 201...
... Cone-shaped main body, 202 ... Branch hole, 203 ... Heat-shrinkable branch pipe, 204 ... Heat-shrinkable main body.

Claims (1)

[Claims] 1. Peel off the sheath of a multi-core cable to be processed over a predetermined section from the end to expose each cable core, and then A pyramid-shaped body having an arbitrary shape, which is formed by integrally providing a plurality of pipe-shaped bodies and having a conductor buried therein so as to penetrate through the pyramid-shaped body, is inserted into each cable core into the pipe-shaped bodies. , a method for terminal processing a multi-core cable, characterized in that the cable cores are inserted between the cable cores, and the cable cores are then directly pulled out. 2. The plurality of pipe-like bodies are connected at one end to a pipe section formed of the same material as the pipe-like body and having a shape sufficient to cover the end of the multi-core cable. Multi-core cable terminal processing method described in section.