JPS59157978A - Method of forming connector of rubber and plastic power cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to rubber/plastic electrical cable connections and ICs.
The present invention relates to a method for forming γX8.

For example, methods for connecting power cables using crosslinked polyethylene as an insulator can be roughly classified into the following two types of means for forming a reinforcing insulating layer. That is, there is a tape winding molding method using polyethylene to which a crosslinking agent has been added, and an extrusion molding method using polyethylene to which a crosslinking agent has been added.

(1) If the thickness of the reinforcing insulating layer becomes large, it will take a very long time to wind the tape. (2) There is a risk of foreign matter between the layers of tape winding. (3) If the thickness of the reinforcing insulating layer becomes large, cross-linking will occur. There are problems such as it takes a long time. In addition, in the latter extrusion molding method, as shown in FIG.
The molten uncrosslinked polyethylene 2 from is injected into a mold 5 placed around the connection 4 of the cable 3 to be connected, the mold 5 is removed after the polyethylene 2 has cooled, and the external semiconducting The layer is formed, for example, by tape winding, and the crosslinking mold is again set around the connecting portion 4 and crosslinked by heating from the outside. This extrusion method is
Although (2) of the tape-wrapping molding method is sufficiently solved, although the time required for extrusion during the step 111r of forming the reinforcing insulating layer corresponding to (1) is short, a lot of time is spent on extrusion. Therefore, the current situation is that it will not be shortened much. Also,
As for (3), it is the same, and there is no solution to the problem.

An object of the present invention is to provide a method for forming joints of rubber/plastic cables that eliminates the drawbacks of the conventional methods described above and significantly shortens the construction time. A molded container having heat resistance and elasticity is placed around the part to be connected, and a heating metal plate is attached around the part to be connected, and a melted untreated metal is placed in the space around the part to be connected in the molded container. ? Injecting ε or uncrosslinked reinforcing insulating layer forming material, filling the space between the molding container and the heating mold with a heating/pressurizing medium, and heating without solidifying the reinforcing insulating layer forming material. It is characterized by performing vulcanization or crosslinking treatment.

Next, the method according to the invention will be described in accordance with the embodiment illustrated in FIG.
(I will explain this in detail.

In FIG. 2, reference numerals 10a and 10b are terminals of cables to be connected. For example, the tips of insulators 11a and llb made of polyethylene formed into pencil sharpeners are brought together, and the core wires are connected by a conductive sleeve 12. An internal semiconductive layer (not shown) is formed on this conductive sleeve 12-,
Around these connected parts, a substantially spindle-shaped molded container 13 having a gap between it and the cable to be connected is arranged.

This molded container 13 has heat resistance and elasticity, and is made of, for example, ethylene propylene rubber, neoprene rubber, silicone rubber, etc.
Chloroprene rubber, Teflon coated glass cloth, etc. are used. A heating mold 14 is further arranged around these, and between the mold 14 and the insulators 11a and llb,
Cylindrical pressure seal adapters 15a, 15b made of the same material as the molding container 13 are interposed, and insulation blocks 16a, 16b are arranged on both sides of the mold 14. Heating mold 14
Annular grooves 17a and 17b are provided at positions in contact with the pressure seal adapters 15a and 15b, and the pressure seal adapters 15
The annular rings 18a and 1.8b provided on the parts a and 15b are fitted together to prevent positional displacement during heating. A heater plate 19 is provided around the heating metal ilj l 4 to heat the mold 14 to a predetermined temperature.

Further, the heating mold 14 is provided with an inlet portion 20 for injecting the reinforcing insulating layer material into the molding container 13, and a metal slot 4 is provided.
An inlet portion 21 for injecting the heated and pressurized IjL body is provided in the space between the molded container 13 and the molded container 13. Note that 22 is a support for the molded container 13.

When molding the reinforcing insulating layer of the contact hc ff1i, molten uncrosslinked polyethylene 30, which will become the reinforcing insulating layer, is injected into the molding container 13 from the artificial part 20 via an extruder (not shown). Then, when the injection is finished, a valve (not shown) is closed, and the heating mold 14 is heated by the heater plate 19, and then the uncrosslinked polyethylene 30 is heated to the crosslinking temperature.

At this time, heat transfer is performed in advance through the inlet portion 21 of the heating mold 1.
4 and the molded container 13 through the heating chamber pressurized body 31 and the molded container 13. Further, since the polyethylene 30 is arched by 1f7j due to the heat of the force 11, the pressure of the pressurized waste 32 is adjusted and pressure is applied from the surroundings to the molded container 13 by the heating and pressurizing medium 31, thereby preventing the molded container 13 from expanding. For this heating/pressurizing medium 31, a liquid such as siliconoyl or an inert gas such as nitrogen or argon can be used, or a medium that is solid at room temperature and becomes liquid upon heating is disclosed in Japanese Patent Application Laid-open No. 19752-1982. Preferably, the special polyethylene-based polymers disclosed are used. Once the crosslinking of the uncrosslinked polyethylene 30 is completed,
The heating by the heater plate 19 is stopped, and the crosslinked polyethylene 3
0, the heating mold 14 is removed, and the molded container 1 is further removed.
Remove 3 as well. Then, to the north of the reinforcing insulating layer 3-3 formed of the cross-linked polyethylene 30, uncross-linked polyethylene is wrapped with tape to form an external semiconductive layer if necessary, and cross-linked by heating by radiation, for example. good.

In the embodiment, since the molded container 13 and the pressurized seal adapters 15a and 15b are separate members, it is necessary to seal the connecting portions of these with an adhesive or the like as necessary during assembly. Of course, there is no problem even if the two are used as an integrally molded product in advance.

The method according to the present invention is compared with the conventional method as follows. First, the conventional method is described in order of 11-stroke: (1) Assemble a mold around the part to be connected.

(2) Preheat the mold and extruder.

(3) Inject uncrosslinked polyethylene into a mold to form a reinforcing insulating layer.

(4) Cooling the formed reinforcing insulating layer.

(5) Remove the molding die.

(6) Form an external semiconductive layer of uncrosslinked polyethylene on the reinforcing insulating layer by wrapping with tape.

(7) Assemble a bridging mold around the part to be connected.

(8) Heat the crosslinking mold to crosslink the reinforcing insulating layer and the external semiconductive layer.

(8) Remove the crosslinking mold.

It is.

The steps of the method according to the present invention are similarly described: (1) A molding container 13 is placed around the connected portion, and a heating mold 14 is further assembled on the outside of the molding container 13.

■ Preheat the molding container 13, heating mold 14, and extruder.

■ Inject uncrosslinked polyethylene 30 into molded container 13.

■ Heating the heating mold 14 to form uncrosslinked polyethylene 30
is cross-linked.

(2) After cooling the reinforcing insulating layer 33 formed of the crosslinked polyethylene 30, the molding container 13 and the heating mold 14 are removed.

■ Form an external semiconductive layer of uncrosslinked polyethylene by wrapping with tape.

■ Heat and crosslink the outer semiconductive layer.

It is.

Among the two, excluding the almost identical steps, the ones that require a lot of construction time are: (4) in the conventional method;
It takes 3 hours to assemble the crosslinking mold in (7), and 8 hours for the crosslinking process in (8). However, in the method according to the present invention, the crosslinking process (1) takes 4 hours, and the crosslinking process (2) takes 1 hour, resulting in a time difference of 9 hours between the two, even if simply calculated. The biggest difference is that in the conventional method, the f! &lIl'5'For JIX, the injection hardening process using two sets of molds and the crosslinking process are performed separately. The time lost during reheating is
This will be improved in the present invention.

In the examples, cables using polyethylene as an insulator have been explained, or even in the case of an insulator made of rubber, unvulcanized rubber can be used as the material for forming the reinforcing insulating layer and vulcanization treatment can be applied in the same way. It's good to act.

Therefore, according to the method for forming the connection part of a rubber/plastic electric cable cable according to the present invention, a molded container having heat resistance and elasticity is used, and the injection hardening step and the crosslinking step are performed in one step.
By consolidating the power cables into 1r, there is a great advantage that the on-site work time for connecting the power cables can be significantly shortened.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of injecting uncrosslinked polyethylene into a mold using an extruder, and Fig. 2 is an explanatory diagram showing an example of a method for forming a connection part of a rubber/plastic electric cable according to the invention. be. Reference numerals 10a and 10b indicate cables 1. lla,. 11b is an insulator, 12 is a sleeve, 13 is a molded container, 1
4 is a heating mold, 15a and 15b are adapters for pressure sealing, 19 is a heater plate, 20 and 21 are inlet parts, 30 is uncrosslinked polyethylene, 31 is a heating/pressure medium, and 33 is a reinforcing insulating layer. . Patent Applicant: Dainichi 8-Electric Wire Co., Ltd. Teitouri Neyama Masashi (self-motivated) 1 March 26, 1982 Japan Patent Office Commissioner Kazuo Wakasugi 1 Indication of Case 1982 Patent Application No. 31484 2 , Name of the invention Method for forming connection parts of Comken plastic electric cable cable 3 Relationship with 111 amendments Patent amount 1 person Address 8, Higashimukojima Nishinocho, Amagasaki City, Kyoko Prefecture Name (326)
Dai B8 Hon Electric Wire Co., Ltd. Representative Yuki Aoyama KX (4. Agent address: C-104, 3 Umejima High Town, 2-17 Umejima, Adachi-ku, Tokyo 121 7. Contents of amendment (1) Amend the application as per the attached sheet. (2) "Siliconoil" in the third line of page 6 of the specification is corrected to "silicone oil." (Spontaneous) 1. Indication of the incident 1988 patent Application No. 31484 2, Name of the invention Method for forming the connection part of a rubber/plastic electric cable 3, Relationship with the person making the amendment Patent applicant address 8, Nishinocho, Higashimukojima, Amagasaki City, Hyogo Prefecture Name (326)
Dainichi Ki Electric Wire Co., Ltd. Representative Yuki Aoyama kJ [4, Agent address: C-104 Umejima High Town, 2-17-3 Umejima, Adachi-ku, Tokyo 121 5. Subject of amendment 6. Details of amendment Drawing No. 2 Correct the figure as shown in the attached sheet.

Claims (1)

[Claims] 1. Arrange a molded container with heat control properties and elasticity around the connected part of the power cable, and further place a heating mold around it, and fill the space around the connected part in the 1111 molded container. At the same time, the molten unvulcanized or uncrosslinked reinforcing insulating layer forming material is injected, and the space between the molding container and the heating mold is filled with a heating and pressurizing medium. A method for forming joints of rubber/plastic cables, which is characterized by performing vulcanization or crosslinking treatment by heating without solidifying the forming material.