JPH09270213A - Composite insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite insulator in which a reinforced plastic rod and a gripping metal are prevented from coming off even when a large tensile load affects between the reinforced plastic rod and the gripping metal and mutual coupling strength of the both is heightened. SOLUTION: An insert metal 4 engaged in one end part of a reinforced plastic rod 1 and having a screw part 40 in the outer circumferential face is inserted into the reinforced plastic rod 1 and at the same time a reception groove 21 to be fitted with the screw part 40 formed in the outer circumferential face of the insert metal tool 4 is formed in an insertion hole 20 of a holding metal 2a, 2b and the insert metal 4 is screwed in the holding metal 2a, 2b, so that the holding metal 2a, 2b and the reinforced plastic rod 1 can be fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite porcelain having a reinforced plastic rod having a lengthwise end fixed with a holding metal fitting for fixing to a utility pole or holding a live wire.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Laid-Open No. 5-2320, for example, this type of composite insulator uses a holding metal fitting having a tapered insertion hole that is widened inward and inserting the holding metal fitting. Insert one end in the length direction of the reinforced plastic rod into the hole, fill the thermosetting bonding resin between the inner peripheral surface of the insertion hole and the outer peripheral surface of the reinforced plastic rod, and heat-treat this bonding resin. Then, the metal fitting is joined and integrated with the end portion of the reinforced plastic rod by being cured. Then, when a tensile load is applied between the grip fitting and the reinforced plastic rod, the taper surface formed on the outer peripheral surface of the bonding resin and the taper surface formed on the inner peripheral surface of the insertion hole are brought into pressure contact with each other. Thus, the gripping metal and the reinforced plastic rod are prevented from coming off by producing a so-called wedge effect.

[0003]

By the way, according to the above composite insulator, since the coefficient of thermal expansion of the reinforced plastic rod is relatively large, the reinforced plastic rod is filled between the reinforced plastic rod and the insertion hole of the holding metal fitting. When the bonding resin is heat-cured, the reinforced plastic rod expands and contracts, and a gap is generated between the reinforced plastic rod and the cured bonding resin layer, and the bonding resin layer and the reinforced plastic rod are bonded to each other. In some cases, it cannot be performed satisfactorily and firmly. Therefore, when a large tensile load is applied between the grip fitting and the reinforced plastic rod, there is an inconvenience that the reinforced plastic rod and the grip fitting come off. .

An object of the present invention is to prevent the reinforced plastic rod and the holding metal fitting from coming off even if a large tensile load is applied between the reinforced plastic rod and the holding metal fitting, and to improve the bonding strength between them. It is to provide a composite insulator that can be strengthened.

[0005]

In order to achieve the above object, the invention according to claim 1 inserts and fixes the longitudinal end portion of the reinforced plastic rod 1 into the insertion holes 20 of the holding metal fittings 2a and 2b. In the composite insulator, the reinforced plastic rod 1
The insert metal fitting 4 that is locked to the end portion of the insert metal and has the threaded portion 40 on the outer peripheral surface is inserted into the reinforced plastic rod 1, and the insert metal fitting 4 is inserted into the insertion holes 20 of the gripping metal fittings 2a and 2b. By forming the receiving groove 21 to be screwed into the threaded portion 40 provided on the outer peripheral surface and screwing the gripping metal fittings 2 a and 2 b into the insert metal fitting 4, the gripping metal fitting 2
The a and 2b and the reinforced plastic rod 1 are fixed.

According to the second aspect of the present invention, a taper surface 10 is formed at the end of the reinforced plastic rod 1 in the longitudinal direction, the taper surface 10 having a diameter increasing toward the end, and at the inner peripheral surface of the insert fitting 4. By providing a tapered surface 41 that engages with the tapered surface 10 formed at the end of the reinforced plastic rod 1 in the length direction,
The insert metal fitting 4 is locked to the end of the reinforced plastic rod 1 by the engagement of the two tapered surfaces 10 and 41.

[0007]

According to the first aspect of the present invention, the insert metal fitting 4 inserted into the reinforced plastic rod 1 is attached to the grip metal fitting 2a,
2b is fitted and the grip fittings 2a, 2b are screwed to form a receiving groove 21 formed on the inner peripheral surface of the grip fittings 2a, 2b. While being screwed into 40, this insert fitting 4
Moves toward the end of the reinforced plastic rod 1 in the length direction, and the insert metal fitting 4 is locked at the end of the reinforced plastic rod 1 in the length direction.
The gripping metal fittings 2a, 2b and the reinforced plastic rod 1 can be securely and firmly fixed to each other via the lugs, so that a large tensile load acts between the reinforced plastic rod 1 and the gripping metal fittings 2a, 2b. However, it is possible to reliably prevent both of them from coming off.

According to the second aspect of the present invention, the grip metal fitting 2
When the insert metal fitting 4 of a and 2b is screwed, the insert metal fitting 4 has a taper surface 4 provided on its inner peripheral surface.
1 moves to the end side of the reinforced plastic rod 1 while slidingly contacting the tapered surface 10 formed on the reinforced plastic rod 1 and expanding toward the end side, and the tapered surfaces 10 move along with the movement. Since the parts 10 and 41 engage with each other in a pressure-contact manner, the contact resistance between the tapered surfaces 10 and 41 can be increased to more securely and firmly fix the gripping metal fittings 2a and 2b and the reinforced plastic rod 1. it can. Moreover,
The tapered surface 10 of the reinforced plastic rod 1 is formed so as to expand in diameter toward the end portion in the length direction of the reinforced plastic rod 1, and the insert fitting 4 is engaged with the tapered surface 10. Since the tapered surface 41 is formed, it is possible to reliably prevent the insert metal fitting 4 from being pulled out to the outer side of the reinforced plastic rod 1, and the reinforced plastic rod 1 and the grip metal fittings 2a, 2b It is possible to guarantee a reliable fixing.

[0009]

FIG. 2 shows a long insulator as a preferred embodiment of the composite insulator according to the present invention. This insulator basically comprises a reinforced plastic rod 1 and both ends in the longitudinal direction thereof. It is provided with a pair of left and right gripping metal fittings 2a, 2b which are joined and integrated with the section and grip the left and right live lines.

The reinforced plastic rod 1 is formed into a long length by impregnating a bundle of glass fibers with a synthetic resin such as epoxy resin or polyester resin and curing the bundle, and the holding metal fittings 2a and 2b are It has a circular insertion hole 20 which is formed of a cast product or a forged product and into which both lengthwise ends of the reinforced plastic rod 1 can be fitted.

For the reinforced plastic rod 1, it is preferable to use a tubular drawing material formed by a so-called pultrusion molding method in which roving fibers impregnated with a resin are drawn out from a heating die and formed. This drawing material is used. Sometimes
The bending strength can be increased while the reinforced plastic rod 1 can be easily molded. It should be noted that a filler made of an insulating material is loaded inside the drawing material for use.

Further, in the embodiment shown in the figure, between the holding metal fittings 2a and 2b on the outer periphery of the reinforced plastic rod 1,
An insulator body 3 made of silicon rubber or the like having a plurality of caps 31 bulging outward in the radial direction is fitted.

Thus, in the above composite insulator, as shown in FIG.
As shown in the embodiment, a large-diameter portion 11 having a tapered surface 10 on the outer peripheral surface, the diameter of which increases toward the outer end of the reinforced plastic rod 1, is provided at one end in the longitudinal direction of the reinforced plastic rod 1. In addition to being integrally formed, a threaded portion 40 is formed on the outer peripheral surface around the outer periphery of the large diameter portion 11, and the inner peripheral surface has a slope gradient substantially the same as that of the tapered surface 10. The cylindrical insert metal fitting 4 having the tapered surface 41 that can be engaged with is inserted and fitted into the insertion hole 20 of the gripping metal fitting 2a, which is screwed into the screw portion 40 provided in the insert metal fitting 4. The groove 21 is formed.

In forming the large-diameter portion 11 on the reinforced plastic rod 1, first, as described above, the reinforced plastic rod 1 is formed by the drawing method, and the insert metal fitting 4 is inserted into the reinforced plastic rod 1. After that, by winding the resin-impregnated glass fiber around the end portion side of the reinforced plastic rod 1 by, for example, filament winding means or tape winding means, the outer peripheral surface is tapered toward the outer end portion side. The large-diameter portion 11 having the surface 10 is formed, and after the hardening, the tapered surface 10 is subjected to finishing processing. When only the large diameter portion 11 is formed by the filament winding means or the tape winding means on the reinforced plastic rod 1 thus formed by the pultrusion method, when the entire plastic rod 1 is formed by the filament winding means or the tape winding means. In comparison, it can be formed easily and at low cost.

When fixing the reinforced plastic rod 1 and the holding metal fitting 2a, the insert metal fitting 4 inserted into the reinforced plastic rod 1 is moved to the large diameter portion 11 side of the reinforced plastic rod 1. By fitting the gripping metal fitting 2a on the insert metal fitting 4 and screwing the gripping metal fitting 2a, the receiving groove 21 formed on the inner peripheral surface of the grip metal fitting 2a forms an outer peripheral surface of the insert metal fitting 4. The insert metal fitting 4 moves to the large-diameter portion 11 side and is locked while being screwed into the threaded portion 40 formed in 1.

At this time, in the insert metal fitting 4, the tapered surface 41 provided on the inner peripheral surface of the insert metal fitting 4 has a tapered surface 10 which expands toward the outer end portion formed on the large diameter portion 11 of the reinforced plastic rod 1. While being slidably contacted with each other, the reinforced plastic rod 1 is moved to the outer end portion side, and with the movement, the tapered surfaces 10 and 41 are engaged with each other in pressure contact with each other, and the contact resistance of the tapered surfaces 10 and 41 is increased. The insert metal fitting 4 is increased to be firmly locked to the large diameter portion 11, and
The insert metal fitting 4 has the gripping metal fitting 2a in the receiving groove 2
1 and the screw portion 40, the grip metal fitting 2a and the reinforced plastic rod 1 are securely and firmly fixed to each other by the insert metal fitting 4, and therefore the reinforced metal Even if a large tensile load is applied between the plastic rod 1 and the grasping metal fitting 2a, they are reliably prevented from coming off.

Moreover, the taper surface 10 of the reinforced plastic rod 1 is formed so as to expand in diameter toward the outer end side in the length direction of the reinforced plastic rod 1. Since the taper surface 41 is formed to have the same inclination as that of the taper surface 10 and is engageable with the taper surface 10, the insert fitting 4 is pulled out to the outside of the reinforced plastic rod 1. It is possible to reliably prevent the reinforced plastic rod 1 and the grip metal fitting 2a from being securely fixed.
It should be noted that, between the tapered surface 10 of the large diameter portion 11 provided on the reinforced plastic rod 1 and the tapered surface 41 of the insert fitting 4, relative rotation between the insert fitting 4 and the large diameter portion 11 is prohibited. Further, it is preferable to provide a rotation stopping means composed of a spline, a spline groove or the like which allows only the sliding of the both.

In the above embodiment, when fixing the reinforced plastic rod 1 and the gripping metal fitting 2a via the insert metal fitting 4, the large diameter portion 11 provided on the reinforced plastic rod 1 and the insert metal fitting 4 are joined together. Although the tapered surfaces 10 and 41 are respectively formed between them, in the present invention, the insert metal fitting 4 is provided between the reinforced plastic rod 1 and the insert metal fitting 4 instead of the both tapered surfaces 10 and 41. When moving to one end side, a plurality of uneven portions having different diameters may be formed so as to be sequentially engaged with each other.

In the above description, only the case where the grip metal fitting 2a on one side is fixed to one side portion of the reinforced plastic rod 1 has been described, but the grip metal fitting fixed to the other side portion of the reinforced plastic rod 1 is described. 2b is also fixed in the same manner as described above. Furthermore, in the above-described embodiment, the long insulator has been described, but the present invention can be applied to, for example, interphase spacer insulators, in addition to this.

[0020]

As described above, according to the first aspect of the invention, the reinforced plastic rod 1 and the holding metal fittings 2a, 2 are provided.
b can be securely and firmly fixed to each other via the insert fitting 4, so that even if a large tensile load is applied between the reinforced plastic rod 1 and the grip fittings 2a, 2b, both of them will come off. It can be securely prevented from coming off.

Further, according to the second aspect of the present invention, when the grip fittings 2a and 2b are screwed to the insert fitting 4, the taper surface 41 provided on the insert fitting 4 and the end portion formed on the reinforced plastic rod 1 are provided. Since the taper surfaces 10 that expand in diameter toward the sides can be brought into pressure contact with each other to increase the contact resistance between the two taper surfaces 10 and 41, the grip fittings 2a and 2b and the reinforced plastic rod 1 can be increased. And can be fixed more reliably and firmly. Moreover, the tapered surface 10 of the reinforced plastic rod 1 is formed so as to expand in diameter toward the end portion in the length direction of the reinforced plastic rod 1, and the insert metal fitting 4 has a shape that is related to the tapered surface 10. Since the mating taper surface 41 is formed, it is possible to reliably prevent the insert metal fitting 4 from being pulled out to the outside of the reinforced plastic rod 1, and the reinforced plastic rod 1 and the gripping metal fittings 2a, 2b. It is possible to guarantee a reliable fixing with.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a main part of a composite insulator according to the present invention.

FIG. 2 is a front view showing the overall structure of the insulator.

[Explanation of symbols]

1 ... Reinforced plastic rod, 10 ... Tapered surface, 2a, 2b
... gripping hardware, 20 ... insertion hole, 21 ... receiving groove, 4 ... insert hardware, 40 ... screw part, 41 ... taper surface.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Kaya 3-6-3, Nakanoshima, Kita-ku, Osaka, Osaka Prefecture Oto Co., Ltd. (72) Koji Haratani 3--6, Nakanoshima, Kita-ku, Osaka, Osaka No. 32 Oto Corporation

Claims (2)

[Claims] 1. A composite insulator in which a longitudinal end portion of a reinforced plastic rod (1) is inserted and fixed in an insertion hole (20) of a holding metal fitting (2a, 2b), wherein the end of the reinforced plastic rod (1). Insert metal fitting (4) having a threaded portion (40) on its outer peripheral surface,
A threaded portion (40) which is inserted into the reinforced plastic rod (1) and is provided in the insertion hole (20) of the grip fitting (2a, 2b) on the outer peripheral surface of the insert fitting (4).
By forming a receiving groove (21) which is screwed into the grip metal fitting (2a, 2b) is screwed into the insert metal fitting (4), the grip metal fitting (2a, 2b) and the reinforced plastic rod (1). ) A composite insulator characterized by fixing and. 2. A taper surface (10) at the end of the reinforced plastic rod (1) in the longitudinal direction, the diameter of which increases toward the end.
And a taper surface (10) formed on the inner peripheral surface of the insert fitting (4) at the end of the reinforced plastic rod (1) in the longitudinal direction.
A taper surface (41) for engaging with is provided, and the insert metal fitting (4) is locked to the end of the reinforced plastic rod (1) by the engagement of both taper surfaces (10) (41). Item 2. A composite insulator according to item 1.