JP4012613B2 - Insulator with reinforced plastic core and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulator having a reinforced plastic as a core, and a method for manufacturing the insulator.
[0002]
[Prior art]
In general, an insulator having a core made of reinforced plastic is known as a so-called polymer insulator or plastic insulator, and one type thereof is, for example, a synthetic resin as disclosed in Japanese Patent Publication No. 7-507733. A core body made of a core material wound endlessly along the outer periphery of a pair of connecting metal fittings positioned at a predetermined interval with a bundle of reinforcing strands, and the outer periphery of the concentric body are covered. There is a type of insulator with an insulating covering made of a resilient material.
[0003]
This type of reinforced plastic core (hereinafter sometimes referred to as polymer insulator) has high tensile strength and is superior in impact resistance and light weight compared to porcelain insulators. There is an advantage that it is excellent in handling such as mounting work.
[0004]
However, in the polymer insulator shown in the above-mentioned publication, the torsional strength and bending strength are not always sufficient, and the polymer insulator to deal with this is described in US Pat. No. 5,374,780 and the drawings. It is shown. In the polymer insulator, a core is formed by winding a thread shape around the outer circumference of the core material along the longitudinal direction thereof in a substantially orthogonal shape, thereby increasing the torsional strength and bending strength of the core itself. The torsional strength and bending strength of the polymer insulator are increased.
[0005]
[Problems to be solved by the invention]
By the way, in the polymer insulator shown in the above-mentioned U.S. patent specification and drawings, the tensile strength is mainly exhibited by the core material constituting the core, and the polymer insulator gives a higher tensile strength. However, it is necessary to increase the number of yarns constituting the core material, but in order to increase the number of yarns of the core material, it is necessary to increase the number of windings on both connecting metal fittings. For this reason, in order to give a higher tensile strength to the polymer insulator, a long time is required for the winding work for forming the core material constituting the core body.
[0006]
Also, in the case of a clevis-eye type polymer insulator in which one end side is formed in a clevis-shaped connecting portion and the other end side is formed in an eye-shaped connecting portion like the polymer insulator, the core constituting the insulator is In forming, two first connecting fittings are arranged facing each other on the side on which the clevis-shaped connecting portion is formed, maintaining a predetermined interval, and 1 on the side on which the eye-shaped connecting portion is formed. The second connecting fittings are arranged at a predetermined interval with respect to the first connecting fitting, and the yarn constituting the core member is connected to the two first connecting fittings and the one second connecting fitting. A means for alternately winding between the metal fittings to form a bundled core material wound endlessly is employed.
[0007]
For this reason, the polymer insulator requires a special winding device for forming the core material compared to the eye-eye type polymer insulator formed on the eye-shaped connecting portions on both ends, and the winding It takes a lot of time to work.
[0008]
Therefore, a first object of the present invention is to provide a polymer insulator of this type along the outer periphery of a pair of connecting metal fittings that are formed of bundle-like yarns reinforced with synthetic resin and are held at a predetermined interval. A core material wound endlessly, that is, a core material constituting an eye-eye type polymer insulator is used to increase the tensile strength with a simple structure.
[0009]
The second object of the present invention is a bundle of yarns reinforced with synthetic resin, wound endlessly along the outer periphery of a pair of connecting fittings positioned at a predetermined interval. The core of the polymer insulator, at least one end side of which is a clevis-shaped connecting portion, without using a special winding device for the yarn. An object of the present invention is to enable the winding operation to be performed without requiring much time.
[0010]
[Means for Solving the Problems]
An insulator (polymer insulator) having a reinforced plastic core as a core of the present invention has an outer periphery of a core having a bundle-like yarn reinforced with a synthetic resin, and an insulating covering made of a resilient material. In a insulator having a core made of a reinforced plastic coated, the core is formed by folding the yarn endlessly into two at the middle part in the longitudinal direction. A pair of first connecting fittings positioned opposite to each other with the ends of the core material being hooked, and the folded intermediate portion of the core material being hooked. It is comprised by the 2nd coupling metal fitting located in an intermediate part.
[0011]
In the polymer insulator according to the present invention, two connecting brackets are adopted as the second connecting brackets, and each of the second connecting brackets is formed of four yarns formed in the folded middle portion of the core material. It can be set as the structure which latches two each of a part.
[0012]
Further, in the polymer insulator according to the present invention, one connecting bracket is adopted as the second connecting bracket, and the second connecting bracket is formed on the folded middle portion of the core material. It can be set as the structure which latches a stripe part collectively and integrally.
[0013]
Moreover, in the polymer insulator which concerns on this invention, it winds and integrates the outer periphery of the four thread parts formed by folding the said core material in two with the thread | yarn formed by reinforced with a synthetic resin. It can be configured.
[0014]
Further, the method of manufacturing the insulator having the reinforced plastic core according to the present invention is a method of manufacturing each of the polymer insulators described above, and includes a bundle of yarns reinforced with a synthetic resin at a predetermined interval. And folding the middle part of the core material wound endlessly along the outer periphery of the pair of first connection fittings positioned so as to hold the first connection fittings opposite to each other, A core body is formed by hooking the folded middle portion of the core material onto the second connecting fitting, and the outer periphery of the concentric body is covered with an insulating coating made of a resilient material while maintaining the folded state. It is characterized by this.
[0015]
[Operation and effect of the invention]
In the polymer insulator having such a configuration, the four yarn portions of the core material constituting the core body are in parallel with each other and extend in the longitudinal direction, and these four yarn portions have the tensile strength of the polymer insulator. It will contribute greatly.
[0016]
Therefore, the core material wound endlessly along the outer periphery of a pair of connecting fittings positioned at a predetermined distance from a bundle of yarn reinforced with synthetic resin is folded back into two. The tensile strength can be remarkably increased as compared with a polymer insulator in which two yarn portions of the core material extend in the longitudinal direction in parallel with each other as in a core body formed by using without using. Further, in the polymer insulator, the tensile strength can be increased by simple means.
[0017]
Moreover, in the said polymer insulator, if each 1st connection metal fitting is arrange | positioned maintaining a predetermined space | interval and one 2nd connection metal fitting is employ | adopted, one end side will be a clevis-eye which is a connection part of a clevis shape. The type of polymer insulator can be easily constructed.
[0018]
Further, in this case, if two second connecting fittings are employed and the second connecting fittings are arranged with a predetermined distance from each other in the same manner as the first connecting fittings, both ends are provided with clevises. A shaped clevis-clevis type polymer insulator can be easily constructed.
[0019]
Each of these polymer insulators is a core material wound endlessly along the outer periphery of a pair of first connecting fittings positioned at a predetermined distance from a bundle of yarns reinforced with synthetic resin The intermediate portion can be easily and inexpensively manufactured by the manufacturing method of the present invention that employs means for folding the intermediate portion into two via the second connecting fitting.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show an example of a polymer insulator according to the present invention. The polymer insulator is an insulator having a reinforced plastic as a core, and is composed of the core 10 and the insulating cover 20. The core body 10 includes a core material 11, a pair of first connection fittings 12, 13, and a pair of second connection fittings 14, 15. It is comprised by the trunk | drum 21 to coat | cover and many annular pleats 22 which are formed in the outer periphery of the trunk | drum 21, and protrude outside.
[0021]
The yarn constituting the core 11 is cured by impregnating a synthetic fiber such as an epoxy resin or an unsaturated polyester resin into a yarn made of monofilament such as glass fiber or synthetic fiber, multifilament, spun yarn of various fibers or the like. As shown in FIGS. 3A and 3B, the core 11 is formed by winding the yarn in an endless manner around the outer periphery of the first connecting fittings 12 and 13 as shown in FIGS. Is formed.
[0022]
Each of the connecting fittings 12 and 13 has a cylindrical shape having inner holes 12a and 13a, and is provided with annular grooves 12b and 13b on the outer periphery thereof, and the outer periphery of both annular grooves 12b and 13b in a state where a predetermined interval is maintained. The thread is wound around. As a result, the core material 11 is wound between the first connecting fittings 12 and 13 in an endless bundle.
[0023]
The core body 10 is configured by folding the core material 11 into two via a pair of second connecting fittings 14 and 15 as shown in FIGS. 4A and 4B at the intermediate portion thereof. Yes. Each of the second connection fittings 14 and 15 has the same configuration as each of the first connection fittings 12 and 13 and, like each of the first connection fittings 12 and 13, has a cylindrical shape having inner holes 14a and 15a. A bundle of yarns is hooked around the outer circumferences of the annular grooves 14b and 15b.
[0024]
In the core body 10, the first connecting fittings 12 and 13 are opposed to each other with a predetermined interval, and the second connecting fittings 14 and 15 are opposed to each other with a predetermined interval. Thus, the core material 11 is divided into four thread-like portions 11a, 11b, 11c, and 11d that are parallel to each other.
[0025]
In addition, spacers 16 and 17 are interposed between the thread-like portions 11a to 11d in the vicinity of the first connection fittings 12 and 13 and in the vicinity of the second connection fittings 14 and 15, respectively. In a mounted state, the yarn 18 is wound around the outer circumference of each of the thread portions 11a to 11d along the longitudinal direction. Thereby, each thread-like part 11a-11d is integrated in the state put together.
[0026]
The insulating cover 20 is made of a resilient material such as silicone rubber, ethylene-propylene rubber, and the like, and a body portion 21 that covers the entire outer periphery of the core body 10 and an outer periphery of the side portion of the body portion 21. And a large number of annular pleats 22 projecting toward the center. The insulating cover body 20 is molded by molding the core body 10 integrally with the outer periphery of the core body 10 in a state where the core body 10 is housed in a predetermined mold. In this state, the inner holes 12a and 13a of the first connecting fittings 12 and 13 open coaxially facing each other, and the inner holes 14a and 15a of the second connecting fittings 14 and 15 are coaxial with each other. It opens to face.
[0027]
In the polymer insulator having such a configuration, the core material 11 constituting the core body 10 is divided into four thread-like parts 11a to 11d, and the thread-like parts 11a to 11 are parallel to each other and extend in the longitudinal direction. And is wound and integrated by the yarn 18. For this reason, the four yarn portions 11a to 11d greatly contribute to the provision of the tensile strength of the polymer insulator.
[0028]
Therefore, the core material 11 shown in FIG. 3, that is, a bundle of yarn reinforced with synthetic resin, is wound endlessly along the outer periphery of the pair of connecting fittings 12 and 13 positioned at a predetermined interval. Compared to a polymer insulator in which two core thread portions extend in the longitudinal direction in parallel with a core body formed by using the core material 11 formed by turning without turning it back into two. Thus, the tensile strength can be remarkably increased. Further, in the polymer insulator, the tensile strength can be increased by simple means.
[0029]
Moreover, in the said polymer insulator, while arrange | positioning each 1st connection metal fittings 12 and 13 with a predetermined space | interval mutually, by arrange | positioning each 2nd connection metal fittings 14 and 15 with a predetermined space | interval mutually, The clevis-clevis type polymer insulator is configured such that both ends are clevis-shaped connecting portions.
[0030]
Therefore, if such a structure is adopted, a clevis-clevis type polymer insulator can be formed in an easy and simple structure.
[0031]
FIG. 5 and FIG. 6 show examples of polymer insulators configured by adopting one second connection fitting. The second connecting bracket 19 employed in the configuration of the polymer insulator is longer than the second connecting brackets 14 and 15, and four threads formed in the folded middle portion of the core material 11 in the annular groove 19 b. The strips 11a to 11d are hooked together. Thus, a clevis-eye type polymer insulator is formed in which one end side is a clevis-shaped connecting portion and the other end side is an eye-shaped connecting portion.
[0032]
The polymer insulator shown in FIG. 5 and FIG. 6 has the same configuration as the above-described clevis-clevis type polymer insulator except for the point that the second connecting fitting 19 is adopted. The same reference numerals are given to members and constituent parts, and detailed description thereof is omitted.
[0033]
Therefore, if such a configuration is adopted, the clevis-eye type polymer insulator can be easily and simply formed.
[0034]
The clevis-clevis type polymer insulator and the clevis-eye type polymer insulator according to the present invention are wound endlessly along the outer periphery of the pair of first connecting fittings 12 and 13 positioned at a predetermined interval. By adopting a means for folding the intermediate part into the turned core 11 and turning it back into two via two 14, 15 or one second connecting fitting 19 in the intermediate part, it is easy and inexpensive to manufacture. be able to.
[Brief description of the drawings]
FIG. 1 is a partially broken front view in which a part of a clevis-clevis type polymer insulator, which is a polymer insulator according to an example of the present invention, is omitted.
FIG. 2 is a partially cutaway side view of a core constituting the polymer insulator.
FIG. 3 is a front view (a) in which a part of the core material constituting the concentric body is not partially folded, and a partially broken side view (b).
FIG. 4 is a front view (a) and a partially broken side view (b) of the same core material after being folded.
FIG. 5 is a partially cutaway front view in which a part of a clevis-eye type polymer insulator, which is a polymer insulator according to another example of the present invention, is omitted.
FIG. 6 is a partially cutaway side view of a core constituting the polymer insulator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Core body, 11 ... Core material, 11a-11d ... Yarn part, 12, 13 ... 1st connection metal fitting, 12a, 13a ... Inner hole, 12b, 13b ... Annular groove, 14, 15, 19 ... 2nd connection Metal fittings, 14a, 15a, 19a ... inner holes, 14b, 15b, 19b ... annular grooves, 16, 17 ... spacers, 18 ... yarns, 20 ... insulating coverings, 21 ... barrels, 22 ... fins.

Claims (5)

In an insulator having a core made of reinforced plastic formed by coating the outer periphery of a core having bundled yarns reinforced with synthetic resin with an insulating coating made of a resilient material, the core However, in the state where the yarn is wound in an endless manner, the core material is formed by folding it back into two at the middle portion in the longitudinal direction, and each end in the state where each end portion of the concentric material is hooked. A pair of first connection fittings positioned opposite to each other, and a second connection fitting located in the intermediate portion with the folded back intermediate portion of the core member hooked. An insulator with a reinforced plastic core. The insulator having the reinforced plastic core according to claim 1, wherein two connection fittings are employed as the second connection fittings, and each of the second connection fittings is formed at a folded middle portion of the core member. An insulator having a core made of reinforced plastic, characterized in that two of the four yarn portions are hooked. The insulator having the reinforced plastic core according to claim 1, wherein one connection fitting is employed as the second connection fitting, and the second connection fitting is formed at a folded middle portion of the core member. An insulator having a core made of reinforced plastic, characterized in that four yarn portions are hooked together. 4. An insulator comprising the reinforced plastic according to claim 1, 2 or 3, wherein the outer periphery of four yarn portions formed by folding the core material into two is reinforced with a synthetic resin. An insulator with a core made of reinforced plastic, characterized by being wound and integrated in a strip. A method for producing an insulator having a reinforced plastic core according to claim 1, 2, 3 or 4, comprising a bundle of yarns reinforced with a synthetic resin and positioned at a predetermined interval. An intermediate portion of the core material wound endlessly along the outer periphery of the pair of first connection fittings is folded back into two so that the first connection fittings are opposed to each other, and the intermediate folding of the core material is performed Reinforcement characterized in that the core is formed by hooking the portion to the second connecting fitting, and the outer periphery of the concentric body is covered with an insulating covering made of a resilient material while maintaining the folded state. A method of manufacturing an insulator with a plastic core.

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