JPS6169317A - Insulating member molding method to lead for electric device - 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 [Industrial Application Field 1] The present invention is a method for molding an insulating member on the lead wire of electrical equipment such as a launch switch of a high-voltage overhead power distribution line or a transformer. J: This is based on an insulating member molding method that is useful when dealing with eels.

[Prior Art] Generally, in the launch switch of a high-voltage overhead power distribution line or the lead wire of a single transformer electrical device, terminal fittings are used to enable it to be incorporated into the insulator of the electrical device. An insulating member such as butyl rubber or ethylene propylene rubber, which is resistant to lagging, is molded on the periphery of the end on the side several steps apart.

By the way, this type of lead wire is often used in places where it is easily contaminated by salt, dust, etc. Therefore, the surface of the molded part of the insulating member mentioned above should be made as smooth as possible to prevent electrical traces. It is desirable to make it difficult for L-ring to occur. For this reason, the presence of vertical lines, etc., where leakage current is likely to flow, is considered unsuitable, and the molds used for molding insulating materials must be undivided, with no vertical mold seams. used.

``Problems to be solved by the invention However, when using an undivided mold, there were the following 11 problems.

Immediately J5, this lead wire is usually 1 to 2 mmf! i! In this method, an insulated wire made of 1-racking-resistant butyl rubber or ethylene propylene rubber that has been cut repeatedly is used, and the insulating member is molded onto one end of the insulated wire.

Therefore, if we consider (1) to prevent the insulating member from flowing out during molding, the inner surface of the lead wire type through hole/41 of the mold 011 section should be
It is desirable that it be in closer contact with the surface of the grid line. However, as shown in FIG.
After the ruby, the mold 40 needs to be moved back to the right side in the figure along the entire length of the exit line 1. Therefore, if the mold 40 is too tight against the exit line 1, the mold 40 cannot be slid. !
It becomes difficult to do so.

(2) On the other hand, if the inner diameter of the lead wire type through hole 41 of the current type 4.0 is made larger than the outer diameter of the lead wire 1, when the insulating member 10 is molded, the above-mentioned It is easier to overflow than the gap between the parts, and moreover, it is difficult to apply pressure during molding to this overflow part 13. Therefore, the insulating member 10 does not firmly adhere to the surface of the grid line 1, and the part q11 is separated. It becomes easier.

[Means for Solving the Problems] An object of the present invention is to overcome the problems of the prior art described above, and to solve the problems of the mold when molding an insulating member using an undivided mold. It is an object of the present invention to provide a method that allows easy removal and prevents overflow of an insulating member.

That is, the gist of the present invention is to provide a conical inner surface whose inner diameter gradually decreases toward one end of the whitening, and
It has a cylindrical inner surface which is continuous with the smallest inner diameter side end of the shaped inner surface and has an inner diameter slightly more perforated than the outside diameter of the lead line, which will be described later, to the other end of itself (i. a first mold 4 of the type; and the first metal ■r /I is placed on one end side in contact with the mold 4, and has an exit wire type through hole in the direction of its own internal axis. a second mold 6 of non-divided or split type;
When molding a predetermined insulating member on the circumference of the lead wire for electrical equipment, the supporting part 9 is assembled so as to cover the first and second molds 4 and 6. A third split-type mold which is in contact with the other end side of the first mold 4 and has a lead wire type through hole with an inner diameter approximately equal to the lead wire outer diameter in the direction of the inner r'II axis of the first mold 4. A method of molding an insulating member into a lead wire for electrical equipment is characterized in that this is carried out by arranging a mold 8.

Here, the inner diameter of the cylindrical inner surface of the first mold is preferably about 1 to 2 times larger than the outer diameter J of the lead wire having the maximum outer diameter. In addition, as the third mold, a split type mold that is divided in the axial direction is used, and several types of molds with different inner diameters of the lead wire insertion holes are used. Use one whose inner diameter matches the outer diameter of the

[Example] Next, an example of the method of molding an insulating member into a lead wire for electrical equipment according to the present invention will be described with reference to FIGS. 1 and 2. In addition, FIG. 1 is a vertical cross-sectional view of a mold used in carrying out the method of this example, and FIG. 2 is a partial view of a molded product molded with Jζ by the method of this example. .

First, the total length is 1 to 2 m, and a terminal fitting (not shown) is attached to one end.
4 = I l - J 1 - Rucking resistant butyl rubber or ethylene propylene rubber Insulated lead wire 1 On the circumference of the terminal fitting side end, one end of itself (left end in the figure) It has a conical inner surface 2 whose inner diameter gradually decreases toward the other end (the right end), and is further connected to the smallest inner diameter end 2' of the conical inner surface 2 to form the projection line 1. A first mold 4 of an undivided type having a cylindrical inner surface 3 having an inner diameter 1 to 2 thresholds larger than the maximum outer diameter extending to its other end; One end of the first mold 4 is provided with the mold 4, and one end of the first mold 4 is placed in contact with the mold 4 and has a lead wire type through hole 5 in the internal axis direction thereof.
a second mold 6 of an undivided type having
The mold 4 is placed in contact with the other end thereof, and has a lead wire insertion hole 7 having an inner diameter that matches the outer diameter of the lead wire 1 in the direction of its own internal axis. The third mold 8 of the type
A two-split mold 9 for support that covers and integrates the entire body is set, and then the first and second molds 1,
An insulating material made of anti-tracking rubber or ethylene propylene rubber is injected into the space surrounded by the exit wire 1 and molded. According to the insulating member mold part 10 of the drawing line manufactured in this way, the second
As shown in the figure, each of the parts 11 and 12 has a smooth surface without vertical lines, and can be made to be in close contact with the grid line 1 throughout the rest period.

In addition, to describe it in a little more detail, the inner diameter of the inner diameter is 1 to 2 mm larger than the expected maximum outer diameter of the lead line 1, and is connected to the minimum inner diameter side end 2' of the conical inner surface 2 of the first mold 4. Since it has the cylindrical inner surface 3, the insulating member 10 injected into the inner surface can be reliably distributed throughout the inside of the mold 4.

On the other hand, on the other end side of the first mold 4, a third mold 8 is arranged so as to seal the frontage of the cylindrical inner surface 3. Here, a dead end Jξ is reached, and its outflow is reliably blocked.

As a result of the above, the insulating member 10 can apply a sufficient pressure of 1 q over the body during heat molding, and can be firmly bonded over the entire lead wire 1.

Incidentally, since the third mold 8 is of a vertically split type and air can be appropriately extracted from the joints, the flow of the insulating member 10 within the first mold 4 is extremely smooth and there are no problems. I1.

[Effects of the Invention] The method of molding an insulating member onto a lead wire for electrical equipment according to the present invention, which is carried out as described above, can bring about the following excellent effects.

(1) Manufacture an insulating member mold part with a smooth surface without vertical streaks.
I can tell you.

(2) The entire insulating member can be firmly adhered to the lead wire.

(3) The slide on the lead wire when removing the mold after molding the insulating member is extremely tight.

In addition, since the third mold is of a split type, it can be easily disassembled by dividing it.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the insulating part molding method for electrical equipment lead wires according to the present invention, and FIG. FIG. 3 is an explanatory diagram of a conventional insulating member molding method of this type.
FIG. 4 is an explanatory diagram of the main part. 1... Exit line, 2... Conical inner surface part. 3... Cylindrical inner surface part, /I... First mold. 5... Output wire insertion hole, 6... Second mold. 7... Output wire insertion hole, 8... Third mold. 9... Support mold, 10... Insulating part material mold part. Procedural amendment (voluntary) 60. '＋・30 Showa year month day 1 case display Showa 59 patent application number 19111-
1 No. 2 Title of the invention Method for molding insulating members onto lead wires for electrical equipment 3 Person making the amendment 4 Agent 〒io. 5. Detailed description of the invention in the list of amendments. 6. Corrected r mm J on page 3, line 7 of the amendment contents box to "'IrL".

Claims (1)

[Claims] (1) It has a conical inner surface whose inner diameter gradually decreases from one end to the other end, and further continues from the minimum inner diameter end of the conical inner surface to the outside diameter of the lead line described below. A first mold 4 of an undivided type having a cylindrical inner surface having a slightly larger inner diameter extending to its other end;
A second mold 6 of an undivided or divided type, which is placed on one end side of the mold 4 in contact with the mold 4, and has a lead wire insertion hole in the direction of its own internal axis; When opening the support member 9 incorporated to cover the first and second molds 4 and 6 and molding a predetermined insulating member around the lead wire for electrical equipment, the first A split-type third mold 8 having a lead wire insertion hole having an inner diameter approximately equal to the lead wire outer diameter in contact with the other end side of the mold 4 and extending in the direction of its own internal axis.
A method for molding an insulating member into a lead wire for electrical equipment, characterized in that this is done by arranging.