JPS5922709Y2 - Cable connection mold - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a cable connection mold.

It is conventional practice to use molds to provide plastic insulating or waterproof coatings at cable connections.

For example, in this type of conventional molding method, after connecting the conductors of two cables to be connected, a two-part mold is placed over this connection, and a pellet or liquid is placed in the mold. There is a method of molding a mold insulating layer and the like by press-fitting a plastic molding material and applying heat and pressure.

In such a method, the mold is heated to about 150 to 180°C, depending on the type of molding material.

This conventional heating method uses rod-shaped cartridge heaters embedded in several places in the mold to perform electrical heating, but because the heating area is small, the thermal efficiency is not good and it takes a long time to raise the temperature to the required temperature. It takes.

Furthermore, when releasing the mold after molding, an appropriate temperature (7
It is necessary to cool the material to a temperature of 0 to 80° C., but this cooling also requires a lot of time and effort.

In addition, when plastisol is used as the molding material,
Each time the cable connection part is removed from the mold after molding,
The next molding operation cannot be performed unless the gelled plastisol remaining in the mold material press-in hole of the mold is thoroughly removed.

However, conventionally, the molding material press-fitting hole was provided on the side of the mold, which required considerable time and effort to remove the gelled plastisol.

The present invention has been devised in view of these points, and provides a cable connection molding die that allows efficient molding work.

According to the present invention, the mold can be heated using hot air, and the temperature can be easily controlled.

The description will be given below based on the drawings.

1 to 4 show an embodiment of the present invention.

In the figure, a mold 1 is divided into two halves that can be divided into left and right parts from the middle part, and a cavity 3 whose shape corresponds to the cable connection part 2 to be molded is connected to both axial ends of the cavity 3. It has cable insertion holes 4a and 4b.

Further, a mold material press-in hole 5 for press-fitting the mold material into the lower part of the mold 1, and an exhaust hole 6 for exhausting the inside of the cavity 3 as the mold material is press-fitted are provided in the upper part.

The press-fit hole 5 and the exhaust hole 6 are provided on the mold mating surface.

Furthermore, two ventilation passages 7a and 7b are provided in the mold 1 at symmetrical positions around the cavity 3 with the mating surface as the center.

Each of the ventilation passages 7a, 7b is made as wide as possible in the middle part of the mold so that the area facing the cavity 3 is widened, and is curved along the cavity 3.

The ventilation passages are open on both end faces of the mold, and blowers 8a and 8b for sending hot or cold air are connected to one of the openings.

Temperature regulators 9a and 9b are connected to the blowers 8a and 8b, and a thermometer 10a is embedded in the middle part of the mold.

A blower is controlled by the blower 10b, and hot or cold air is sent into the ventilation passages 7a and 7b as the temperature of the mold 1 changes.

Although not shown in the drawings, when the two halves of the mold 1 are combined, they are fastened together by suitable means such as screws.

Further, a press fitter 12 is connected to the press fit hole 5 via a hose 11.

The press fitter 12 consists of a case that accommodates a mold material and a piston that extrudes the mold material inside the case.

When the mold 1 constructed as described above is used, it is attached onto the cable connection part 2 to be molded, and the cavity 3 is filled with the molding material in the press fitter 12.

After that, hot air is passed through the ventilation passages 7a and 7b to remove the mold.
A molded insulating layer is formed at the cable connection portion by heating to 0 to 180'C to crosslink the internal molding material.

Next, the mold is disassembled and separated from the cable connection part, but before disassembling the mold, the mold, which is in a high temperature state, is
Cool air is sent into the ventilation passages 7a and 7b to cool the temperature to about 80°C.

The temperature of the mold 1 is controlled by temperature regulators 9a and 9b.

That is, the temperature is constantly detected by the thermometers 10a and 10b, and the supply of hot air or cold air is automatically switched at a preset temperature.

After the mold is disassembled, the residue in the press-in hole 5 and exhaust hole 6 is removed before starting the next molding operation.

This removal work can be easily carried out since both the press-fit hole 5 and the exhaust hole 6 are open in the length direction when the mold is disassembled.

As mentioned above, according to the mold of the present invention, by providing a ventilation path around the cavity, by passing hot air through this, it can be heated to the required temperature in a short time, and the temperature can be easily controlled. .

Furthermore, since it is possible to immediately switch from hot air heating to air cooling, it is possible to improve work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the cable connection mold according to the present invention, Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1, and Fig. 3 is a side view of Fig. 1. , FIG. 4 is an explanatory diagram showing the internal structure of the mold of the same example. 1...Mold, 2...Cable connection part,
3...Cavity, 4a, 4b...Cable insertion hole, 5...Mold material press-fit hole, 6...
...Exhaust hole, 7a, 7b...Ventilation path.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A cavity with a shape corresponding to the cable connection part to be molded, a molding material press-in hole and an exhaust hole that communicate with the cavity, and a cable insertion hole that communicates with both axial ends of the cavity. A cable connection part molding die having a cable connection part molding die, characterized in that a ventilation passage is provided around the cavity. The cable connection mold according to claim 1, which is divided into 22 parts and has mold material press-fit holes in the mating surfaces.