JPS5921513Y2 - Cable connection mold - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a mold for forming a cable connection part.

Conventionally, when providing a plastic mold layer on a cable conductor connection part, a mold having a cavity corresponding to the outer shape of the plastic mold layer is used in advance, and the mold material is press-fitted into this mold and molded under heat and pressure. doing things.

In the second case, a pellet or liquid plastic such as vinyl chloride resin or polyethylene is used as the molding material, and after being press-fitted into the mold, it is heated and crosslinked by a cartridge heater removably embedded in the mold.

When the mold material is press-fitted into the mold, it is press-fitted through the press-fit hole provided at one end of the mold, and the mold material is sequentially filled while exhausting the air in the mold cavity through the exhaust hole provided at the other end. It will be done.

However, when the mold is placed in the normal installation state, that is, when placed parallel to the axial direction, the air inside the mold is not sufficiently exhausted, and the presence of air bubbles in the mold layer not only deteriorates the electrical performance but also improves the appearance. This is undesirable both in terms of economics and the value of the product is significantly impaired.

Furthermore, when this type of plastic mold layer is molded at a cable installation site rather than at a factory, the mold is heated to 150 to 180°C by a cartridge heater, but it takes a considerable amount of time to heat up to this point.

Furthermore, there is a risk that an operator may get burnt by touching the mold heated to a high temperature in this manner, which is not desirable if the mold is left as is.

The present invention has been made to improve the above points.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

In the figure, the mold 1 is a structure divided into upper and lower halves,
It has a cavity 3 having a shape corresponding to the outer shape of the plastic mold layer to be provided on the cable conductor connection part 2, a mold material press-fit hole 4 communicating with the cavity 3 at one end, and an exhaust hole 5 at the other end. .

At several locations around the cavity 3, extendable legs 7 are provided on the bottom surface of the side having the exhaust hole 5 into which the cartridge heater 6 is removably inserted.

A hinge mechanism 8 is provided on the bottom surface of the side having the press-fit hole 4 to facilitate the expansion and contraction movement of the leg 7.

A heat insulating material 9 is attached to the mold surface. The press-fit hole 4 is connected via a hose 10 to a press-fit device 11 for press-fitting the mold material into the mold 1.

The mold 1 having the above structure is tilted so that the exhaust hole 5 side is higher than the press-fit hole 4 side by extending the legs 7 before press-fitting the molding material into the cavity 3 with the press-fitting device 11.

If the mold material is gradually expanded into the cavity 3 in this state, the air within the cavity is forced upward as the mold material is press-fitted and is completely exhausted from the exhaust hole 5.

Note that the legs 7 do not need to be extendable and may be of a fixed type.

When the cable 12 is a vinyl sheathed cable, plastisol can be used as the molding material to easily form a mold layer that does not leave any air bubbles inside.

The mold material filled in the cavity 3 is heated to about 180° C. by the cartridge heater 6 and crosslinked.

As mentioned above, the mold according to the present invention has legs on the bottom surface of the side with the exhaust hole, so there is no risk of air bubbles remaining in the mold layer formed on the cable conductor connection part, and the electrical , it is possible to mold a cable connection part with a good appearance.

Furthermore, according to the present invention, by pasting a heat insulating material on the outer surface of the mold, the mold can be heated efficiently, especially when forming a cable connection part at a cable installation site. This has the effect of preventing workers from accidentally touching their hands and causing burns.

[Brief explanation of drawings]

The drawing is a schematic diagram showing an embodiment of a mold for forming a cable connection part according to the present invention. 1...Mold, 2...Cable conductor connection portion, 3...Cavity, 4...Press-fit hole, 5...
...Exhaust hole, 7...Legs, 9...
Insulation.

Claims (1)

[Claims for Utility Model Registration] 1. A cavity with a shape corresponding to the outer shape of the plastic mold layer to be provided on the cable conductor connection part, a mold material press-fit hole communicating with the cavity at one end, and an exhaust hole at the other end. What is claimed is: 1. A mold for forming a cable connection part, characterized in that the mold for forming a cable connection part has legs provided on the bottom surface of the side having the exhaust hole. 2. A mold for forming a cable connection portion according to claim 1 of the utility model registration claim, which has a heat insulating material affixed to the outer surface.