JPS5949768B2 - End treatment method for existing covered wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating the end of an existing covered electric wire.

Generally, covered electric wires (including cables) are connected to a power distribution board or the like by having terminals fixed to their ends.

However, during use under the above-mentioned conditions, a problem arose in that oil and the like inside the coated wire ran through the core wire and flowed out to the terminal side.
If oil or the like flows out to the terminal side, dust and dirt will adhere to the oil, causing short circuit accidents. The present invention has been made in view of the above problems, and provides a method for treating the ends of existing insulated wires that prevents oil etc. from flowing out to the terminal side. After cutting a long core wire, expose the core wire, connect the core wire of a new insulated wire of a predetermined length prepared separately to the core wire via a crimp sleeve, and then insert the core wire of the new insulated wire located at the mouth of the crimp sleeve. The crimping sleeve and its vicinity are finally subjected to airtight insulation treatment.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

The drawing shows an end treatment section of an existing covered electric wire formed by the method of the present invention, and reference numeral 1 shows an end of an existing covered electric wire cut off to a predetermined length, and then a core wire 11 is exposed.

One end of the crimp sleeve 2 is fixed to the exposed core wire 11. One end of a separately prepared covered wire 3, which is approximately equal in length to the cut-off covered wire, is fixed to the other end of the crimp sleeve 2. That is, a predetermined length of the insulation coating 31 is stripped off from one end of the new coated wire 3 to expose the core wire 32, and the core wire 32 is fixed to the other end of the crimp sleeve 2.

After the core wire 32 of the new insulated wire 3 is connected to the core wire 11 of the existing insulated wire 1 with the crimp sleeve 2, the twist of the core wire 32 of the new insulated wire 3 located at the mouth of the crimp sleeve 2 is loosened. The purpose of loosening the twist is to sufficiently perform the airtight treatment described below. Finally, airtight insulation treatment is performed. That is, a filler 4 such as epoxy adhesive or cyanoacrylate instant adhesive is filled between the loosely twisted core wires 32 to achieve airtightness, and an insulating tape or molded cover 5 is applied to the crimp terminal 2 and its vicinity. The work can be completed by insulating the insulation. In addition, 6 in the figure is a terminal, and the new covered electric wire 3
It is fixed to the core wire 33 on the other end side. This terminal 6 may be attached before one end of the new covered wire 3 is fixed to the crimp terminal 2, or may be attached after airtight insulation treatment is performed. In the above example, the airtight insulation treatment was performed using an insulating tape or a molded cover after filling the filler, but a structure in which an adhesive layer is provided on the inner peripheral surface of the heat-shrinkable tube It is also possible to fill the filler and attach the tube at the same time using a heat-shrinkable tube with adhesive.

Next, specific examples of the present invention will be described.

Cut off 300mm of the end of an existing 3.5-inch polyvinyl chloride wire made by twisting 7 pieces of 0.8mm annealed copper wire, and attach a terminal to the other end of a separately prepared approximately 300mm length. Connect one end of the polyvinyl chloride wire to the existing polyvinyl chloride wire with a crimp sleeve, loosen the twist of the new polyvinyl chloride wire, and then cover the adhesive-coated heat-shrinkable tube. was formed.

By heating and shrinking the tube, the adhesive can be sufficiently filled between the core wires. A water pressure of 1.5 kg/Cm was applied from the existing line side of the treatment section thus formed, and the amount of water flowing out to the terminal was examined. The results are shown in Table 1 as an example. In order to compare with the above example, about 30 mm of the existing polyvinyl chloride wire sheathing was stripped off.
Core wire. Do not loosen the twists and clean the surface of the core wire.
Comparative Example 1 shows an end treated portion formed by placing a heat-shrinkable tube with adhesive on top of the core wire while oil etc. remains attached to the core wire, and heat-shrinking the tube.
After cleaning the surface of the core wire with alcohol, the adhesive-applied heat-shrinkable tube was overturned, and the end-treated portions formed by heat-shrinking the tube are shown in Table 1 as Comparative Example 2.

Table 1 As is clear from the above Table 1, the present invention has perfect airtightness and can reliably prevent oil etc. from leaking to the terminal side.

Cleaning the surface of the core wire as in Comparative Example 2 improves the airtightness compared to Comparative Example 1, but the quality of the cleaning work directly affects the airtightness and causes the problem that uniform quality cannot be maintained. Undesirable. In the present invention, since a new coated wire is used, there is no need to clean the surface of the core wire, and the twist of the core wire of the new coated wire is loosened so that the filler can be sufficiently filled between the core wires to ensure airtightness. can be done.

[Brief explanation of drawings]

The drawing is a partially cutaway front view showing a treated part obtained by the method for treating the end of an existing covered electric wire according to the present invention. 1 is an existing covered wire, 2 is a crimp sleeve, 3 is a new covered wire, 4 is a filler, and 6 is a terminal.

Claims (1)

[Claims] 1 After cutting off the end of the existing insulated wire to a predetermined length, the core wire is exposed, and the core wire of a new insulated wire of a predetermined length prepared separately is connected to the core wire via a crimp sleeve, and then the opening of the crimp sleeve is A method for treating the end of an existing insulated wire by loosening the twist of the core wire of a new insulated wire located in the area, and finally treating the crimp sleeve and its vicinity with airtight insulation.