JPS594550Y2 - Molding device for cable connections - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for a cable connection part, and more particularly to a molding device suitable for forming a branch connection part of a rubber or plastic insulated cable.

Recently, rubber has been used as a method to easily form branch connections for rubber and plastic insulated cables on site.

After stripping the end of the plastic insulated cable and connecting the conductor of the branch cable, a two-split mold is fitted over the conductor connection part, and while the mold is heated, plastisol is filled into the cavity with a press-fitting machine. However, a method has been developed in which this is heated and gelled under pressure.

Conventionally, a steel pipe with an L-shaped connector has been used to connect the connector attached to the press-in port of the mold and the press-fitting machine, but in this device, the heating of the mold (
There was a problem in that plastisol remaining inside the press-fitted copper pipe turned into gel under the influence of the temperature (approximately 120°C), making it difficult to clean and remove it.

The present invention was devised to solve these difficulties, and by connecting the mold injection port and the plastisol press-fitting device with a hose made of highly heat-resistant rubber or plastic, the connection work site can be improved. To provide a molding device that can be used continuously without requiring complicated cleaning work.

The present invention will be described below with reference to an embodiment of the drawings.

As shown in the drawings, the molding device of the present invention has a cavity 1 shaped to match the shape of the cable connection part, and a two-split mold 4 in which a cartridge heater 2 and a thermocouple 3 are embedded. , a plastisol press fitter 5, and a highly heat-resistant rubber or plastic hose 6.

The hose 6 is made of rubber such as NBR, nitrile rubber, or plastic such as urethane rubber, silicone rubber, etc. that can withstand operating temperatures of about 120°C, and is a short metal press-fit tube installed as a press inlet at the bottom of the split mold 4. 7
One end is removably inserted into the end of the press fitter 5, and the other end is connected to the plastisol injection port of the press fitter 5.

The plastisol contained in this press-fitting device is mainly composed of vinyl chloride resin powder dispersed in a plasticizer, and if necessary, dibasic asulfite, tribasic lead sulfate, Contains stabilizers such as cadmium stearate and banium stearate, fillers and pigments such as calcium carbonate, titanium oxide, kaolin clay, and silica, as well as volatile diluents, surfactants, flame retardants, etc. and
A liquid version is preferable.

In order to manufacture a cable branch connection using the molding device of the present invention configured as described above, first, the cable conductor connection is made by connecting the conductors of the main line and the branch line with each other with a sleeve, or an insulating tape or the like is wrapped thereon. The material that has been subjected to turning insulation treatment is set in the cavity 1 of the halved mold 4.

Next, the cartridge heater 2 is energized to heat the mold 4 to 1.
After heating to 20° C., the piston of the press fitter 5 is pressed to force the plastisol into the cavity 1 of the mold 4.

When filling with plastisol is completed, the temperature of the mold 4 is raised to 170° C. to 180° C., and the hose 6 is immediately removed from the press fitting pipe 7 while being connected to the press fitting device 5.

At this time, the plastisol filled in the mold cavity and the press-fitting tube quickly gels and loses fluidity at the mold temperature of 170 to 180°C, but the plastisol remaining in the rubber or plastic pipe Due to the heat insulating effect (low thermal conductivity) unique to rubber or plastic, heat from the mold is difficult to be transmitted to the inside of the hose, so it does not gel and maintains fluidity.

There is no need to clean and remove the inside of the hose like in the past.
There is an advantage that the hose can be inserted into the press inlet of another mold in this state and the press fitting operation can be performed continuously.

In addition, in the molding device of the present invention, plastisol, which has fluidity from the time it is filled into the cavity, is used as the molding material, so pressure propagation inside the mold is uniform, there are no voids, and the appearance is good. A cable connection portion with excellent waterproofness can be obtained.

[Brief explanation of drawings]

The drawing is a partial horizontal cross-sectional view of the molding device of the present invention. 2... Cartridge heater, 4...
Split mold, 5...press fitting device, 6... hose, 7... press fitting pipe.

Claims (1)

[Scope of utility model registration request] A split mold having a cavity in the shape of the cable connection part to be molded, a press fitter for filling the cavity with plastisol, and a press fitter that is removably inserted into the press opening of the mold, and the press fitter is connected to the mold. Molding equipment for cable connections that are cut from the connecting heat-resistant rubber or plastic hoses.