JPH0224231Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an extrusion mold for a cable, which is used to form a reinforcing insulator, for example, in a connection part of a rubber-plastic insulated cable.

[Prior art] In order to form a reinforcing insulator at a cable connection using an extrusion molding method using synthetic resin, a container for forming a polyethylene resin or the like into the shape of the reinforcing insulator is required around the connection. The resin is pressurized so that it flows into every corner of the cavity in a molten state, and as a result, the container is exposed to high temperature and pressure. Therefore, this container is generally made of metal and is usually called a mold.

However, the shape and dimensions of the reinforcing insulator differ depending on the voltage class and size of the cable, and accordingly, many types of molds must be prepared. Therefore, the cost for this becomes extremely high, and a correspondingly large space for storing the molds is required.

[Purpose of the invention] The purpose of the invention is to make the mold a two-layer structure of an outer mold and an inner mold, and change the inner mold to the required shape, in order to eliminate the above-mentioned drawbacks. An object of the present invention is to provide an extrusion mold for cables, which enables the reduction of mold-related costs and storage space.

[Summary of the invention] The gist of the invention to achieve the above objectives is as follows:
In a mold that surrounds a cable connection and extrudes molten insulation material into a space between the cable connection and the connection, the mold is integrally provided with a common outer mold and the reinforcing insulation to be molded. This extrusion mold for cables is characterized by a dual structure with an inner mold that can be replaced to match the shape of the body.

[Embodiments of the invention] The invention will be described in detail based on illustrated embodiments.

In Figure 1, 1a and 1b are CVs to be connected
The cables 1a, 1b have insulating layers 2a, 2b shaped like pencil sharpeners, and core wires 3a, 2b.
3b are connected by a conductor sleeve 4. A mold 5 is provided around this connection, and an uncrosslinked polyethylene resin serving as an insulation reinforcement is extruded and injected from an injection pipe 6 into the gap between the cable connection and the mold 5. . Mold 5 is the second
As shown in the figure, it is divided into upper and lower halves in a split-type manner, and is assembled by fitting the divided molds 5 together from both sides of the connection part and fixing them with bolts 7. . The mold 5 has a two-layer structure and can be disassembled into an outer mold 8 and an inner mold 9, and the outer mold 9 has lead,
A buffer member 10 made of a relatively soft metal such as aluminum is attached, and a heater 11 is provided outside the outer mold 9. The inner mold 9 is selected according to the shape of the reinforcing insulator to be formed, and is fitted with the shared outer mold 8 and fixed with assembly bolts 12.

In this way, for example, uncrosslinked polyethylene resin is injected into the cavity of the inner mold 9, but the performance of the mold 5 is no inferior to that of a conventional monolithic structure, and the mold 5 is By dividing into layers, the inner mold 9 can be replaced and used as appropriate. Moreover, by heating this mold 5 with the heater 11, the uncrosslinked polyethylene resin can be crosslinked. In this case, since a soft buffer member 10 is interposed between the outer mold 8 and the inner mold 9, when the molds 8 and 9 are tightened together with the assembly bolts 12, the buffer member 10 is easily removed. Since the molds 8 and 9 are brought into close contact with each other, it is possible to improve heat conduction. Note that this buffer member 10 may be omitted depending on the case.

FIG. 3 shows another fixing means for fixing the outer mold 8 and the inner mold 9, in which the buffer member 10 is omitted, a stud bolt 13 is provided on the inner mold 9 instead of the assembly bolt 12, and the outer mold A bolt hole 14 is bored in the corresponding part of the mold 8, and a C-ring 15 for clamping the stud bolt 13 is inserted inside.

[Effects of the invention] As explained above, in the extrusion mold for cables according to the present invention, the inner mold, which determines the shape to be molded, can be arbitrarily replaced with the shared outer mold. Another advantage is that the cost of the mold is reduced and the storage space for the mold is small.

[Brief explanation of the drawing]

The drawings show an embodiment of the extrusion mold for cables according to the present invention, and FIG. 1 is a sectional view of the mold attached to the cable connection part, FIG. 2 is a cross-sectional view of the mold, and FIG. 3 is a cross-sectional view of the mold. The figure is a longitudinal sectional view showing only a part of a mold of another embodiment. 4 is a mold, 6 is an injection tube, 8 is an outer mold, 9
1 is an inner mold, 10 is a buffer member, 11 is a heater, 1
2 is an assembly bolt, and 13 is a stud bolt.

Claims (1)

[Claims for Utility Model Registration] 1. In a mold that surrounds a cable connection part and extrudes molten insulating material into the space between the cable connection part and the connection part, the mold is integrated with a common outer mold and the inside thereof. 1. An extrusion molding mold for a cable, characterized by having a double structure with an inner mold that is provided as a cylindrical mold and can be replaced according to the shape of a reinforcing insulator to be molded. 2. The extrusion mold for a cable according to claim 1, wherein a buffer member made of a soft metal is interposed between the outer mold and the inner mold. 3. The extrusion mold for a cable according to claim 1, wherein a heater is disposed outside the outer mold. 4. The extrusion mold for cables according to claim 1, wherein the mold is divided into two parts.