JPH11329119A - Press-fit joining method of frp tube of polymer insulator tube with flange metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely hold an adhesive on the adhesive interface in the time of the press-fit of an FRP tube with a flange metal fitting. SOLUTION: In this method, the flange metal fitting 2 is press-fitted and joined with the FRP tube 1 of a polymer insulator tube which is composed of the FRP tube 1, an envelope composed of a barrel part around the FRP tube 1 and plural umbrella parts, and the flange metal fitting 2 provided to the end of the FRP tube 1. Here, a convex part 11 is formed on the outer peripheral end of the FRP tube 1. And a concave part 12 is formed at the axial end of the inner periphery of an insertion hole 3 of the flange metal fitting 2, such that the convex part 11 fits into the concave part 12 when the press-fit joining of the FRP tube 1 with the flange metal fitting 2 has been finished. An adhesive 21 is applied to at least the outer periphery of the FRP tube 1, which is, thereafter, press-fitted into the insertion hole 3 of the flange metal fitting 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an FRP cylinder, a jacket comprising a body and a plurality of caps provided on the outer periphery of the FRP cylinder, and a flange metal fitting provided at an end of the FRP cylinder. The present invention relates to a method for press-fitting an FRP cylinder of a polymer insulator tube to a flange fitting. The object of the present invention is a polymer insulator tube whose core member is formed of a hollow FRP tube. Among the so-called polymer insulators, the polymer SP insulator whose core member is formed of a hollow FRP tube is the present invention. Needless to say, it is included in the concept of polymer porcelain.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing an example of the structure of a conventional polymer insulator tube. In the example shown in FIG. 6, the polymer porcelain tube 51 is composed of an FRP cylinder 52 and a jacket 53 made of rubber such as silicone rubber formed on the outer periphery of the FRP cylinder 52. The outer cover 53 includes a trunk portion 54 that covers the FRP cylinder 52.
And a plurality of caps 55 provided at appropriate intervals in the axial direction of the polymer porcelain tube 51 and extending radially outward from the outer periphery of the body portion 54. Further, flange fittings 56 are provided at both ends of the FRP cylinder 52.

[0003] In a conventional polymer insulator having the structure shown in FIG. 6, it is known that the FRP cylinder 52 is press-fitted into an insertion hole 57 of the flange metal fitting 56 in order to join the FRP cylinder 52 and the flange metal fitting 56. As one example, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 9-153316, as an example of press-fitting, an FRP cylinder 52 at the time of press fitting.
Is set to be larger than the inner diameter of the insertion hole 57 of the flange metal fitting 56, and after applying an adhesive to the outer peripheral surface of the FRP cylinder 52 and / or the inner peripheral surface of the insertion hole 57 of the flange metal fitting 56, the FRP A technique is disclosed in which the cylinder 52 is press-fitted into the insertion hole 57 of the flange fitting 56 and then the adhesive is cured.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 9-1 is disclosed.
According to the technique disclosed in Japanese Patent No. 53316, the FRP cylinder 52 and the flange metal fitting 56 can be firmly joined to each other by a synergistic effect of press-fitting and bonding, but a predetermined joining strength and airtightness may be obtained depending on the case due to variation in working conditions. There was something I could not do. In the present invention, the FRP cylinder 52
An example is disclosed in which a resin retaining portion extending in the circumferential direction is formed on the outer peripheral surface of the metal member and on the inner peripheral surface of the insertion hole 57 of the flange fitting 56. When the present inventors investigated the cause of the above-mentioned inconvenience, under conditions with a press-fitting step, the FRP cylinder 52 and the inner peripheral surface of the insertion hole 57 of the flange fitting 56 contacted,
Outer peripheral surface of FRP cylinder 52 and / or flange fitting 56
It has been found that, after bonding the adhesive uniformly applied to the inner peripheral surface of the insertion hole 57, a continuous adhesive layer cannot be formed on the bonding interface after bonding, thereby failing to develop strength and airtightness.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a method of press-fitting an FRP cylinder and a flange fitting of a polymer insulator tube, which can securely hold an adhesive at an adhesive interface when the FRP cylinder and the flange fitting are press-fitted.

[0006]

According to the present invention, there is provided a method for press-fitting an FRP tube of a polymer insulator tube to a flange fitting, comprising the steps of: forming an FRP tube; a shell provided on the outer periphery of the FRP tube and comprising a body and a plurality of caps; In the method of press-fitting the FRP cylinder and the flange fitting of the polymer insulator tube comprising the flange fitting provided at the end of the FRP cylinder, a convex portion is provided on the outer peripheral surface of the end of the FRP cylinder, and the inner peripheral surface of the insertion hole of the flange fitting is formed. At the end on the axial back side, there is provided a concave portion into which the convex portion is fitted when press fitting of the FRP cylinder and the flange fitting is completed, and at least the FRP
After the adhesive is applied to the outer peripheral surface of the cylinder, the FRP cylinder is press-fitted into the insertion hole of the flange fitting.

In the present invention, when the projection provided on the outer peripheral surface of the end portion of the FRP cylinder press-fits the FRP cylinder into the insertion hole of the flange fitting, the outer peripheral surface of the FRP cylinder other than the projection and the insertion hole of the flange fitting are inserted. It functions to ensure a space between the inner peripheral surface and the inner peripheral surface. Therefore, if at least the adhesive is applied to the outer peripheral surface of the FRP cylinder and press-fitted, the adhesive can be held in this space, and the adhesive does not fall off at the time of press-fitting. As a result, the adhesive can be uniformly provided between the outer peripheral surface of the FRP cylinder and the inner peripheral surface of the insertion hole of the flange fitting, and a decrease in the joining force between the FRP cylinder and the flange fitting can be prevented. Further, the concave portion provided at the axial end of the inner peripheral surface of the insertion hole of the flange has a function of accommodating the convex portion of the FRP cylinder at the end of joining.
Therefore, when the press-fitting is completed, the convex portion enters the concave portion and the outer peripheral surface of the FRP cylinder is pressed against the inner peripheral surface of the insertion hole of the flange fitting by the elastic deformation force of the FRP cylinder, so that the bonding can be more reliably performed.

[0008]

1 (a) and 1 (b) are sectional views showing an example of an FRP cylinder and a flange fitting used in the present invention. In FIGS. 1A and 1B, 1 is F
The RP cylinder, 2 is a flange fitting, and 3 is an insertion hole of the flange fitting 2. The feature of the present invention is as shown in FIG.
A convex portion 11 is formed on the outer peripheral surface of the end portion of the FRP cylinder 1, and a concave portion 12 is formed at an axially deep end portion of the inner peripheral surface of the insertion hole 3 of the flange fitting 2, as shown in FIG. It is to form. The positional relationship between the convex portion 11 and the concave portion 12 is determined by FRP
When the press fitting of the cylinder 1 and the flange fitting 2 is completed, the protrusion 11 is fitted into the recess 12.

The actual dimensions and shape of the convex portion 11 are as follows.
The width w is about 5 mm to 15 mm and the height h is about 0.1 mm to 0.2 mm, depending on the outer diameter of the. FIG.
5A and 5B, the dimensions of the convex portion 11 and the concave portion 12 are shown larger than the size of the FRP cylinder 2 so that the shapes of the convex portion 11 and the concave portion 12 can be easily understood. The outer peripheral edge of the end of the FRP cylinder 1 and the flange fitting 2
Are provided with tapered portions 1a, 2a for centering and guiding when press-fitting. In addition, the flange fitting 2 is provided with a bolt insertion hole 4 for use in connection with other equipment at the bottom outer peripheral edge, and the FRP cylinder 1 is provided at the bottom inner peripheral portion in the same manner as a normal one. There is provided a receiving portion 5 for receiving. Since the present invention is premised on press-fitting, the outer diameter d1 of the FRP cylinder 1 is larger than the inner diameter d2 of the insertion hole 3 of the flange fitting 2 at the time of press-fitting. The difference between d1 and d2 is a press-fit allowance, and this press-fit allowance is set in consideration of the allowable stress of the FRP cylinder 1 and the flange fitting 2. The protrusion is FR
Although it is easy to cut out the P material by processing, it may be made of another material and integrated with the FRP.

The press-fitting method according to the present invention will be described below with reference to FIGS. First, as shown in FIG.
An adhesive 21 is applied to the outer peripheral surface of the P cylinder 1. Although not shown here, the adhesive 21 may be applied to the inner peripheral surface of the insertion hole 3 of the flange fitting 2. The application position is FRP cylinder 1
When the joining between the flange fitting 2 is completed, the area corresponds to the inner peripheral surface of the insertion hole 3 of the flange fitting 2. Next, as shown in FIG. 3, the FRP cylinder 1 is gradually inserted into the insertion hole 3 of the flange fitting 2 using the tapered portions 1a and 2a for guiding. At this time, the convex portion 11 provided on the outer peripheral surface of the end portion of the FRP cylinder 1 comes into contact with the inner peripheral surface of the insertion hole 3 of the flange fitting 2. Does not come into contact with the inner peripheral surface, and a space having a thickness substantially equal to that of the convex portion 11 is formed. The adhesive 21 can be held in this space, so that the adhesive 21 does not fall off during the press-fitting step.

Finally, as shown in FIG. 4, when the end of the FRP cylinder 1 comes into contact with the receiving portion 5 of the flange fitting 2 and press-fitting is completed, the convex portion 11 is deformed by the elastic deformation force of the FRP cylinder 1. 12, the outer peripheral surface of the FRP cylinder 1 is pressed against the inner peripheral surface of the insertion hole 3 of the flange fitting 2 via a uniform layer of the adhesive 21. At this time, since the adhesive 21 held in the space is extruded from the bonding interface, the adhesive 21 can be surely present on the entire bonding interface.
Adhesion can be made more reliably. At the time of press-fitting, the flange fitting 2 may be heated to increase the inner diameter, and the insertion force of the FRP cylinder 1 may be reduced to facilitate the work.

FIGS. 5A and 5B are views showing an example of a convex portion 11 provided at the tip of the FRP cylinder 1 used in the present invention. In the present invention, as shown in FIG. 5A, the convex portion 11 may be formed in a continuous annular shape.
As shown in (b), an annular cutout in the axial direction may be provided, which has four cutouts provided symmetrically with respect to the axis. When the notch is provided in the convex portion 11, when the adhesive 21 is provided on the inner peripheral surface of the insertion hole 3 of the flange fitting 2, the adhesive 2
1 is easily drawn into the bonding interface. In the present invention, it is not necessary to pay attention to the flow of the adhesive 21 at the bonding interface. Therefore, it is not necessary to provide a special groove on the inner peripheral surface of the insertion hole 3 of the flange fitting 2 or the outer peripheral surface of the FRP cylinder 1 as in the related art.

[0013]

As is apparent from the above description, according to the present invention, the convex portion provided on the outer peripheral surface of the end portion of the FRP cylinder has the FR
In order to ensure the space between the outer peripheral surface of the FRP cylinder other than the convex portion and the inner peripheral surface of the insertion hole of the flange fitting when press-fitting the P cylinder into the insertion hole of the flange fitting, at least an adhesive material is used. Is applied to the outer peripheral surface of the FRP cylinder and press-fitted.
The adhesive can be held in this space, and the adhesive does not fall off during press-fitting. As a result, the adhesive can be uniformly provided between the outer peripheral surface of the FRP cylinder and the inner peripheral surface of the insertion hole of the flange fitting, and a decrease in the joining force between the FRP cylinder and the flange fitting can be prevented. In addition, since the concave portion provided at the axial end of the inner peripheral surface of the insertion hole of the flange fitting functions to accommodate the convex portion of the FRP cylinder at the end of joining, when press-fitting is completed,
Due to the elastic deformation force of the FRP cylinder, the convex part enters the concave part, and the outer peripheral surface of the FRP cylinder is pressed against the inner peripheral surface of the insertion hole of the flange fitting, so that the bonding can be more reliably performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an FRP cylinder and a flange fitting used in the present invention.

FIG. 2 is a view showing one step of a press-fitting joining method of the present invention.

FIG. 3 is a view illustrating another step of the press-fitting joining method of the present invention.

FIG. 4 is a view showing still another step of the press-fitting method according to the present invention.

FIG. 5 is a diagram showing an example of a convex portion provided at the tip of an FRP cylinder used in the present invention.

FIG. 6 is a diagram showing a configuration of an example of a conventional polymer insulator tube.

[Description of Signs] 1 FRP cylinder, 1a taper part, 2 flange bracket, 2
a taper portion, 3 insertion hole, 4 bolt insertion hole, 5 receiving portion, 11 convex portion, 12 concave portion, 21 adhesive

Claims (3)

[Claims] An FRP for a polymer insulator tube comprising an FRP cylinder, an outer shell comprising a body and a plurality of caps provided on the outer periphery of the FRP cylinder, and a flange metal fitting provided at an end of the FRP cylinder.
In the press-fitting joining method between the cylinder and the flange fitting, a convex portion is provided on the outer peripheral surface of the end of the FRP cylinder, and the press-fitting joining between the FRP cylinder and the flange fitting is completed at the axially inner end of the inner peripheral surface of the insertion hole of the flange fitting. At the time when the convex portion is provided with a concave portion into which the convex portion is fitted, an adhesive is applied to at least an outer peripheral surface of the FRP tube, and then the FRP tube is press-fitted into an insertion hole of a flange fitting. Press fitting method of flange fitting. 2. The method according to claim 1, wherein the convex portion has a continuous annular shape. 3. The method according to claim 1, wherein the convex portion has an annular shape and has a notch in an axial direction.