JPH09129062A - Suspension insulator for electrical insulation and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension insulator for electrical insulation and its manufacturing method which is excellent in tensile strength and impact strength. SOLUTION: In this device, a suspension insulator 1 comprizing a porcelain base 4 is sectioned into a head part 2 covered with mounting hardware 10 and cement 9, and a shoulder part 3 other than this head part, the head part section being equipped with a head part glaze layer 6 on a surface thereof, the shoulder part section with a shoulder part glaze layer 7 on a surface thereof respectively. In this event, a joint portion of the head part glaze layer 6 with the shoulder part glaze layer 7 is constructed by forming joint parts, in such a manner as to get thinner gradually toward respective tip ends, on the tip ends of the head part glaze layer 6 and of the shoulder part glaze layer 7 respectively and by laying the joint parts one on top of the other. A suspension insulator for electrical insulation having joint parts like this is manufactured by an improved dipping method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator for electrical insulation having excellent tensile strength and impact strength, and a method for manufacturing the same.

[0002]

2. Description of the Related Art The applicant of the present invention has proposed, as an example of an electric insulator excellent in tensile strength and impact strength, Japanese Examined Patent Publication No. 49-218.
In Japanese Patent Laid-Open No. 65, a suspension insulator made of a porcelain body is divided into a head covered with a fitting and cement and a cap portion other than this head, and the thermal expansion coefficient of the porcelain body is provided on the surface of the head division. Of the glaze layer having a coefficient of thermal expansion of 36 to 68% (normal temperature to 800 ° C), and the coefficient of thermal expansion of 71 to 96% (normal temperature to 800 ° C) of the coefficient of thermal expansion of the porcelain body on the surface of the cap portion. Disclosed are electrical insulators each having a glaze layer.

FIG. 5 is a diagram showing a structure of an example of the above-mentioned conventional insulator for electrical insulation. In FIG. 5, the suspension insulator 61 is shown.
Has a porcelain body 64 made of the same porcelain body made up of a head portion 62 and a cap portion 63 other than this head portion. Head 6
2 a predetermined head glaze layer 66 on the outer and inner surfaces 65
And a predetermined cap portion glaze layer 67 is provided on the surface of the cap portion 63. On the outer head glaze layer 66, a mounting member 70 is provided via a sand layer 68 and a cement layer 69. On the inner glaze layer 66, a sand layer 68,
The pin 71 is provided via the cement layer 69. Pin 7
1 is used to connect a plurality of suspension insulators 61.

[0004]

By the way, in the above-mentioned insulator for electric insulation shown in FIG.
It is necessary to continuously provide three different glaze layers, namely, a head glaze layer 66 and a cap portion glaze layer 67.
At the joint between the cap and the glaze layer 67, the ends of both may overlap with each other as shown in FIG. 6 (a), or a gap may be formed between them as shown in FIG. 6 (b).

As shown in FIG. 6 (a), when the two end portions overlap each other, the sand layer 68 is filled in the overlapped portions, and the adhesive force with the cement layer 69 is weakened.
When a tensile force is applied to the head portion 62, there is a problem that the mounting bracket 70 is easily removed. Further, if a thin portion or a gap is formed between the two as shown in FIG. 6B, when a tensile force is applied to the head portion 62, the maximum tensile force is applied to the thin portion or the gap and a crack is generated from this portion. There was a problem that it was likely to occur.

An object of the present invention is to solve the above-mentioned problems,
It is intended to provide an insulator for electrical insulation having excellent tensile strength and impact strength, and a method for manufacturing the same.

[0007]

The insulator for electrical insulation according to the present invention is a suspension insulator made of a porcelain body, which is divided into a mounting hardware and a head covered with cement, and a cap portion other than the head.
A head glaze layer on the surface of the head section, and an electrical insulating suspended insulator comprising a cap section glaze layer on the surface of the cap section, respectively, the joint portion between the head glaze layer and the cap section glaze layer. The head glaze layer and the cap portion glaze layer are formed at the tips thereof with a joining portion that gradually becomes thinner toward the respective tips, and the joining portions are stacked together.

The first invention of the method for producing an insulator for electrical insulation according to the present invention is the method for producing a suspension insulator for electrical insulation as described above, wherein the head glaze layer is provided outside the head section. The head glaze layer is provided outside the head section by immersing the head downward in the glaze of the overflow dipping tank to a predetermined position and pulling it up.

Further, a second invention of the method for producing an insulator for electrical insulation according to the present invention is the method for producing a suspension insulator for electrical insulation as described above, wherein the head glaze layer is provided inside the head section. Set the head downward; inside the set head, a glaze supply and a nozzle for supplying and sucking glaze and an electrode for measuring the glaze surface are integrally provided.
The suction device is set with the tip of the upward facing cap portion as a reference; the glaze is supplied from the nozzle to the inside of the head; the time when the surface of the supplied glaze comes into contact with the electrode is detected and detected. At the same time, the supply of glaze from the nozzle is stopped; the glaze supplied to the inside of the head from the nozzle is sucked and removed; the glaze supply / suction device is retracted from the head. is there.

Furthermore, a third invention of the method for producing an insulator for electrical insulation according to the present invention is the method for producing a suspension insulator for electrical insulation described above, which is the same as the method for producing a suspension insulator for electrical insulation described above. When the layer is provided in the cap portion section, the nozzle for supplying the glaze is positioned and set at a predetermined distance above the end of the head glaze layer provided at least outside and inside the head, and the head is rotated. At the same time, by supplying glaze from the nozzle, the cap portion glaze layer is provided in the cap portion section.

Furthermore, a fourth invention of the method for producing an electrical insulator according to the present invention is the above-mentioned method for producing an electrical insulator suspension insulator, which is characterized by comprising the following steps. Method: (1) Glazing step on the outside of the head: The head is glazed downward by immersing the head in the glaze of an overflow dipping tank to a predetermined position and pulling it up to provide the head glaze layer outside the head section. (2) Glazing process on the inside of the head: The head is set downward, and a nozzle for supplying and sucking the glaze and an electrode for measuring the glaze surface are integrally provided inside the set head. Set the glaze supply / suction device with the tip of the upward facing cap as a reference, supply the glaze from the nozzle to the inside of the head, and detect when the surface of the glaze supplied comes into contact with the electrode And detect At the same time, the supply of glaze from the nozzle is stopped, the glaze supplied to the inside of the head from the nozzle is sucked and removed, and the glaze supply / suction device is retracted from the head; and (3) Cap portion Glazing step: The nozzle for supplying the glaze is positioned and set at a predetermined distance above the end of the head glaze layer provided at least on the outside and inside of the head, and the head is rotated and at the same time the glaze is supplied from the nozzle. By doing so, the cap portion glaze layer is provided in the cap portion section.

In the above-mentioned structure, a joint portion having a wedge-shaped cross section is formed at the tips of the head glaze layer and the cap portion glaze layer, which gradually becomes thinner toward the respective tips. By forming a joint between the head glaze layer and the shade glaze layer by stacking the joint portions, the joint between the head glaze layer and the shade glaze layer can be made equal to the thickness of the head glaze layer or the shade glaze layer. The thickness can be the same, and no gap is generated at this joint.

In order to manufacture the above-mentioned joint portion, the positioning of the end portions of the head glaze layer and the cap portion glaze layer at the time of glaze and the joining portion of the head glaze layer and the cap portion glaze layer at the time of glaze are applied. It is necessary to control the thickness of the portion to be processed, that is, to make the thickness thinner toward the tip, and this point can be achieved by using the first to fourth inventions of the manufacturing method of the present invention.

[0014]

FIG. 1 is a diagram showing the construction of an example of an electrical insulating suspension insulator according to the present invention. In the example shown in FIG. 1, the suspension insulator 1 has a porcelain body 4 made of the same porcelain body, which is composed of a head 2 and a cap portion 3 other than the head 2. A predetermined head glaze layer 6 is provided on the outer and inner surfaces 5 of the head 2, and a predetermined cap portion glaze layer 7 is provided on the surface of the cap portion 3. On the outer head glaze layer 6, a mounting member 10 is provided via a sand layer 8 and a cement layer 9. A pin 11 is provided on the inner head glaze layer 6 via a sand layer 8 and a cement layer 9. The pin 11 is used to connect a plurality of suspension insulators 1. These structures are the same as those of the conventional suspension insulator for electrical insulation.

What is important in the construction of the suspension insulator for electrical insulation according to the present invention is, as shown in a partially enlarged view in FIG.
This is an improvement in the joint structure between the head glaze layer 6 and the cap portion glaze layer 7 on both the outer and inner surfaces of the head 2. That is, at the tips of the head glaze layer 6 and the cap portion glaze layer 7, joint portions 21 and 22 that are gradually thinned toward their respective tips, that is, joint portions having a wedge-shaped cross section are formed. The portions 21 and 22 are overlapped with each other to form a joint portion between the head glaze layer 6 and the cap portion glaze layer 7.

As a result, the joint portion between the head glaze layer 6 and the cap portion glaze layer 7 can be made to have the same thickness as the head glaze layer 6 or the cap portion glaze layer 7, and the sand layer 8 can be formed. It can be formed uniformly. Therefore, the mounting bracket 10 can be prevented from falling off. Further, no gap is generated at this joint portion, and it is possible to eliminate the generation of cracks due to the gap at the joint portion.

Hereinafter, a preferred example of the method for manufacturing the suspended insulator for electrical insulation according to the present invention will be described step by step. First, it is necessary to prepare the porcelain body 4. This porcelain body 4 can be obtained through the same steps as in the prior art of kneading, shaping, drying and firing kneaded clay having a predetermined composition. Next, the following steps are performed on the obtained porcelain body 4 to obtain a final suspension insulator for electrical insulation.

(1) Glazing step on the outside of the head (FIG. 2: first invention): As shown in FIG. 2 (a), the head 2 is moved downward to a predetermined position in the glaze 32 of the overflow dipping tank 31. By immersing and pulling up, the head glaze layer 6 is provided on the outside of the head 2 by dipping as shown in FIG. Here, the overflow dipping tank 31 is used because the head portion 2 of the suspension insulator 1 is a glaze 32.
The liquid level of the glaze 32 is always constant even when immersed in the
This is because the end portion of the head glaze layer 6 can be accurately positioned.

In the glaze process on the outside of the head by this dipping, the head is removed from the glaze 32 in order from the end of the glaze layer 6 at the time of pulling up, so that the time of immersion in the glaze 32 is the end of the head glaze layer 6. The part is shorter. Therefore, as shown in FIG. 2B, it is possible to obtain the head glaze layer 6 having a wedge-shaped cross section, which gradually becomes thinner toward the tip.

(2) Glazing process on the inside of the head (FIG. 3: second invention): First, as shown in FIG. 3 (a), the head 2 is set downward, and the inside of the set head 2 is set. The glaze supply / suction device 41 is set. This glaze supply / suction device 41
Is a nozzle 42 for supplying and sucking the glaze 32.
And the electrode 43 for measuring the liquid level of the glaze 32 are integrally provided on the substrate 44. The setting of the glaze supply / suction device 41 is performed with the substrate 44 brought into contact with the tip of the upward facing cap portion 7 and the tip as a reference. Then, with the glaze supply / suction device 41 set in this way, the tip of the electrode 43 comes to a position corresponding to the position of the end of the head glaze layer 6 inside the head.

The clearance between the inner bottom of the head 2 and the tip of the nozzle 42 is preferably 1 to 2 mm from the viewpoint of completely performing the supply / suction operation of the glaze 32. Also,
Although not shown, it is preferable to provide a hood made of an elastic member such as rubber that spreads toward the tip of the nozzle 42, because the glaze 32 is less likely to remain at the bottom corner of the head 2 during glaze suction.

Next, as shown in FIG. 3B, the nozzle 4
A glaze 32 is supplied to the inside of the head 2 from 2. Then, the time when the surface of the supplied glaze 32 comes into contact with the electrode 43,
A control device (not shown) detects the signal from the electrode 43, and simultaneously with the detection, the supply of the glaze 32 from the nozzle 42 is stopped. Next, as shown in FIG. 3C, the glaze 32 supplied to the inside of the head 2 from the nozzle 42 is sucked and removed, and the head glaze layer 6 is formed inside the head 2. Finally, the glaze supply / suction device 41 is retracted from the head 2.

In the glaze process on the inside of the head by dipping using the glaze supply / suction device 41, the glaze supply /
When the glaze 32 is sucked by the suction device 41, the head glaze layer 6
Since it is removed from the glaze 32 in order from the end of the head, the time of dipping in the glaze 32 is shorter at the end of the head glaze layer 6. Therefore, as shown in FIG. 3C, it is possible to obtain the head glaze layer 6 having a wedge-shaped cross section, which gradually becomes thinner toward the tip. The supply operation and the suction operation of the glaze 32 via the nozzle 42 may be performed by any means, but the supply / suction operation of the glaze by the pump is performed by the nozzle 4
It is preferable that an elastic portion made of rubber or the like is provided at 2 and that the elastic portion is opened and closed by driving a cylinder.

(3) Glazed Kasae process (FIG. 4: third invention):
First, as shown in FIG. 4, glaze supply nozzles 51, 5
2 is positioned and set at a predetermined distance above the ends of the head glaze layer 6 provided on the outside and inside of the head 2, that is, the width of the joint to be formed. Then, the head portion 2 is rotated and, at the same time, the glaze 53 is supplied from the nozzles 51 and 52, whereby the shade portion 7 is provided with the shade portion glaze layer 7. Since the cap portion 3 has a complicated shape, the nozzles 51, 52
Besides, if a nozzle for supplying the glaze is provided in the fold portion of the cap 3 or the like, a more uniform cap glaze layer 7 can be obtained.

As a result, the joint portions 21 and 22 of the head glaze layer 6 and the cap portion glaze layer 7, that is, the joint portions having a wedge-shaped cross section are formed to overlap each other, and the head glaze layer 6 and the cap portion glaze layer 7 are formed. Since the joint portion with the head glaze layer 6 and the cap portion glaze layer 7 can be formed to have the same thickness as the head glaze layer 6 or the cap portion glaze layer 7. .

The fourth invention of the present invention is a content including all steps of the first invention to the third invention of the above manufacturing method, and the description thereof is omitted here. Further, in any of the inventions, the length of the overlapping portion between the head glaze layer 6 and the cap portion glaze layer 7 at the joint is not particularly limited, but is 10 mm.
The following is preferred. Further, the thickness of the head glaze layer 6 and the cap portion glaze layer 7 is the same as the conventional one, for example, 0.
Around 4 mm is preferable. Further, regarding the glaze 32 forming the head glaze layer 6 and the glaze 53 forming the cap portion glaze layer 7, the thermal expansion coefficient of the porcelain body is 36 to 36, which is similar to that of the conventional technique.
Glaze 3 having a coefficient of thermal expansion of 68% (normal temperature to 800 ° C)
2 and 71 to 96% of the thermal expansion coefficient of the porcelain body (normal temperature to 8
It is preferable to use a glaze 53 having a coefficient of thermal expansion of 00 ° C., respectively.

[0027]

As is apparent from the above description, according to the present invention, at the tips of the head glaze layer and the cap portion glaze layer, the joint portion, that is, the cross section, which becomes gradually thinner toward each tip, has a wedge shape. Since the joint part of the mold is formed and the wedge-shaped joint part is overlapped to form the joint part of the head glaze layer and the cap portion glaze layer, the joint part of the head glaze layer and the cap portion glaze layer Can be made to have the same thickness as the head glaze layer or the cap portion glaze layer, and there is no gap at this joint. As a result, an insulator for electrical insulation having excellent tensile strength and impact strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of an electrical insulator suspension insulator of the present invention.

FIG. 2 is a diagram showing an example of a glaze process on the outside of the head according to the present invention.

FIG. 3 is a diagram showing an example of a glaze process on the inside of the head according to the present invention.

FIG. 4 is a diagram showing an example of a cap portion glaze process of the present invention.

FIG. 5 is a diagram showing a configuration of an example of a conventional suspension insulator for electrical insulation.

FIG. 6 is a diagram for explaining a conventional problem.

[Explanation of symbols]

1 suspension insulator, 2 heads, 3 caps, 4 porcelain body, 5
Surface, 6 head glaze layer, 7 head glaze layer, 8 sand layer, 9 cement layer, 10 mounting bracket, 11 pins, 2
1, 22 joining part, 31 overflow dipping, 32 glaze, 41 glaze supply / suction device, 42 nozzle, 43 electrode, 44 substrate, 51, 52 nozzle, 5
3 glaze

Claims (5)

[Claims] 1. A suspension insulator made of a porcelain body is divided into a head covered with a fitting and cement and a cap other than the head, and a head glaze layer is provided on the surface of the head division. And, in the suspension porcelain for electrical insulation, each of which has a shade portion glaze layer on the surface of the shade portion, the joint portion between the head glaze layer and the shade portion glaze layer, the head glaze layer and the shade portion glaze layer At the tip,
A suspension insulator for electrical insulation, characterized in that a joining portion that gradually becomes thinner toward each tip is formed and the joining portion is stacked. 2. The method for manufacturing a suspension insulator for electrical insulation according to claim 1, wherein when the head glaze layer is provided outside the head section, the head is fixed downward in a glaze of an overflow dipping tank. The method of manufacturing a suspension insulator for electrical insulation, characterized in that the head glaze layer is provided outside the head section by immersing and pulling it up to the position. 3. The method for producing a suspension insulator for electrical insulation according to claim 1, wherein the head glaze layer is provided inside the head section, the head is set downward; Inside, set a glaze supply / suction device with a nozzle for supplying and suctioning the glaze and an electrode for measuring the glaze surface integrated with the tip of the upward facing cap portion as a reference; Supplying glaze inside the head;
The time when the surface of the supplied glaze contacts the electrode is detected, and at the same time as the detection, the supply of glaze from the nozzle is stopped; the glaze supplied to the inside of the head from the nozzle is sucked and removed; A method for manufacturing a suspension insulator for electrical insulation, characterized in that the glaze supply / suction device is retracted from the head. 4. The method for manufacturing an electrical insulator suspension insulator according to claim 1, wherein when the cap portion glaze layer is provided in the cap portion section, a glaze supply nozzle is provided at least outside and inside the head. The head portion glaze layer is positioned and set a predetermined distance above the end portion, the head portion is rotated, and at the same time, the glaze is supplied from the nozzle, so that the head portion glaze layer is provided in the head portion section. A method of manufacturing a characteristic electric insulator. 5. The method for manufacturing an electrical insulator suspension insulator according to claim 1, comprising the following steps: (1) Glazing step on the outside of the head: the head The head glaze layer is provided outside the head section by immersing the portion downward in the glaze of the overflow dipping tank to a predetermined position and pulling it up; (2) Glazing step inside the head: the head portion Set downward, and inside the set head, a glaze supply / suction device with a nozzle for supplying and suctioning the glaze and an electrode for measuring the glaze surface integrated with the upward facing cap portion. Set the tip of the glaze as a reference, supply glaze from the nozzle to the inside of the head, detect the time when the surface of the glaze supplied comes into contact with the electrode, and stop the glaze supply from the nozzle simultaneously with the detection And said Noz The glaze supplied to the inside of the head from the head is removed by suction, and the glaze supply / suction device is retracted from the head; and (3) Kasabe glazing step: a glaze supply nozzle is at least outside the head. The head glaze layer is positioned and set a predetermined distance above the end of the head glaze layer provided inside and the head is rotated, and at the same time, glaze is supplied from the nozzle, whereby the head section glaze layer is supplied to the head section. To provide.