JPH01160304A - Terminal stripper for insulated wire - Google Patents

Abstract

PURPOSE:To strip coating perfectly and quickly without employing chemical method and to minimize over cutting of conductor or reduction of cross-section, by blasting abrasive grains to the terminal of wire to be stripped and removing insulation coating. CONSTITUTION:When the terminal 21 of an insulated wire 20 is stripped, the wire 20 is inserted by a length to be stripped into a polish tank 1 through an insertion hole 4a made through a shield board 4. Then air 5 is fed in the direction of an arrow through an air pipe 3a while abrasive grains 10 are sucked in the direction of an arrow through a suction path 3b which is brought into negative pressure through air 5 supply, and mixture flow 10' of the air 5 and the abrasive grains 10 is ejected as shown by an arrow and blasted toward the projecting terminal 21. Consequently, the terminal 21 is stripped through sandblast effect and the conductor is exposed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an end stripping device for efficiently stripping a terminal insulating layer of an enameled wire or the like.

[Prior Art and Problems] In order to use an insulated wire by connecting it to a device or the like, it is necessary to separate the terminal insulating layer by f:lI to expose the conductor and connect it electrically.

If the electric wire used is a vinyl-covered wire, it is easy to peel off the end of the insulating layer, and it can be easily peeled off mechanically. However, it is not always easy to peel off the end of an enameled wire or a coil wound from a coiled wire, and there are various ways to do so depending on the type of insulation coating, the cross-sectional shape of the conductor, etc. Coupled with the strong adhesion of the film, it requires a surprisingly troublesome process.

Polyurethane enamelled wire is the only enamelled wire that can be directly soldered, but connections that do not involve half-bonding require an organic solvent-based stripping agent.

Acid or alkaline stripping agents are used for polyester, formal, and polyesterimide enamelled wires. However, the film of a heat-resistant enameled wire made of polyamide-imide or polyimide cannot be removed by the above-mentioned release agent. For this reason, sodium hydroxide aqueous solution at 50 to 90°C or alkali mixture (N-, 1
0H1K OH, etc.), or a tedious manual polishing process. However, when stripping with a thorium hydroxide aqueous solution or an alkaline melting bath, alkaline fine particles are scattered during heating, and molten alkaline liquid is scattered due to reaction gas with the terminal film, and these droplets are deposited on the insulation film of the coil and lead parts. If it adheres to the surface, corrosion of the film will progress over time during long-term use, leading to a risk of deterioration of insulation performance or short circuit between layers of the coil.

In order to avoid a situation like the one mentioned above, there are some devices that use files, sandpaper, cutters, etc. to mechanically grind or remove the material, but in practice it is inefficient and may cause over-shaving of the conductor. This is by no means an appropriate method.

[Object of the invention] The present invention solves the problems of the prior art as described above, and
An object of the present invention is to provide a novel device for stripping the terminals of insulated wires, which can completely and quickly strip the film without using chemical methods, and can also minimize problems such as overshaving of the conductor and thinning of the cross-sectional area. It is something.

[Summary of the Invention] That is, the gist of the present invention is that the spraying device containing abrasive grains is formed by using a polishing tank, an insertion hole for inserting and protruding the end of the electric wire into the polishing tank, and a The purpose of spraying the abrasive grains is to install a nozzle, and by simply inserting the end of the wire to be stripped through the insertion hole, the abrasive grains can completely remove the insulating film. By using the spraying method, consideration was given to minimizing excessive cutting of the conductor.

[Example] The present invention will be explained below based on examples.

FIG. 1 is an explanatory sectional view showing - of an embodiment of the end peeling device according to the present invention.

Reference numeral 1 denotes a polishing tank, which is constituted by a sealed container provided with an inner lining 2. In the polishing tank 1, there is a nozzle 3 that blows out the abrasive grains 10 contained in the tank with air 5, and the nozzle 3 has an air pipe 1 part 3a and a suction l
183b. On the other hand, the end 21 of the electric wire 20 is located in front of the nozzle 3 where the abrasive grains 10 are ejected.
There is a shield plate 4 having an insertion hole 4a into which an electric wire 20 can be inserted.
Only the required terminal length is M! 11 so that the pond can be completely shielded.

In order to strip the terminal of the insulated wire 20 using the terminal stripping device according to the present invention configured as described above, t1 of the wire 20 is removed.
The terminal length of one separation is inserted and projected into the tank 1 through the insertion hole 4a of the shield plate 4.

Next, air 5 is fed from the air pipe 3a as shown by the arrow in the figure, and abrasive grains 10 are sucked in as shown by the arrow in the figure through the suction iY43b whose internal pressure has become negative due to the feeding of the air 5. A mixed flow 10- of abrasive grains 5 and abrasive grains 10 is injected from the nozzle 3 as shown by the arrow in the figure, and is sprayed toward the protruding end 21. As a result, the film on the terminal 21 is peeled off by a so-called sandblasting effect, and the conductor is exposed.

This sandblasting effect can be easily adjusted to an appropriate value depending on the material of the abrasive grains 10, the shape, the pressure of the air 5 being blown, the shape of the nozzle 3, etc., and thereby only the coating can be selectively removed. , the conductor can be completely stripped of its coating with little additional grinding. Furthermore, the peeling is purely mechanical peeling using abrasive grains, and the troublesome problems associated with the chemical peeling in the prior art examples are completely eliminated.

Note that when there is only one nozzle 3 as shown in Fig. 1, appropriate measures such as rotating the electric wire 20 are required to remove the entire circumference, but as shown in Fig. 2, appropriate measures are required. Nozzle 3.3-
If they are installed in opposite positions, it is possible to peel off the film over almost the entire surface without applying the rotation, and the time required for peeling can be halved, which has the advantage of being able to perform the peeling with high efficiency. . The number of nozzles installed is not limited to two, and a plurality of nozzles may be placed around the wire terminal, thereby further increasing efficiency and improving the quality of the peeled surface.

After peeling using the device of the present invention, minute irregularities are formed on the outer surface of the conductor, but these irregularities particularly contribute to increasing the wettability when soldering the terminal, improving the reliability of the connection part. The additional advantage of being able to achieve this can also be expected.

[Effects of the Invention] As described above, according to the stripping device according to the present invention, since there is no use of acid or alkali, the conventional problems related to this are eliminated, and the stripping device according to the present invention can remove electric wires for which there was no other suitable method other than manual work. For example, it is of great significance that it is possible to peel off the end portion of a rectangular enamelled wire, thereby reducing the illll opening time and improving the quality of the g and II peeling surfaces overall.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view showing how a wire end is stripped by a specific device according to the present invention, and FIG. 2 is an explanatory sectional view showing another embodiment. 1: polishing tank, 3: nozzle, 4: shield plate, 4a: terminal insertion hole, 5: air, 10: abrasive grain, 20: insulated wire, 21: terminal. Agent Patent Attorney Fujio Sato

Claims (2)

[Claims] (1) A spray polishing tank containing abrasive grains, a shield insertion hole formed in the polishing tank for inserting the wire end, and the abrasive grains directed toward the wire end inserted and protruding from the shield insertion hole. A terminal stripping device for an insulated wire, comprising a spray nozzle. (2) The end stripping device according to claim 1, wherein the spray nozzles are installed in pairs so that spray can be sprayed from opposite positions.