JPH06169520A - Manufacture of spiral rod for preventing wind noise for electric wire - Google Patents

Abstract

PURPOSE:To increase the efficiency of spiral forming of a number of spiral rods for preventing wind noise by winding the rods around overhead conductors. CONSTITUTION:Periphery of a core 1 of a reinforcing fiber bundle impregnated with a thermoplastic unpolymerized resin in covered with a complete covering for fiber bundle core 4; its periphery is covered with a corona prevention external covering 6; a linear formed rod material 10 is produced; this formed rod material 10 is wound in a spiral form around the periphery of a winding rod jig is heated; the unpolymerized resin-impregnated fiber core stripe body 3 is cured and cooled off; and spiral rods solidified to a spiral form are produced. Then, sticking between unpolymerized core materials is prevented by covering the unpolymerized resin impregnated reinforcing fiber bundle core material 1 with complete covering for fiber bundle core 4, and the spiral forming is performed very efficiently by forming after winding a number of formed rod materials 10 around a winding rod jig.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a spiral rod wound around an overhead wire to prevent wind noise.

[0002]

2. Description of the Related Art A spiral rod is wound around an electric wire in order to prevent wind noise generated by blowing wind on an overhead wire. However, a conventional wind noise prevention spiral rod formed by spirally forming a metal wire rod of aluminum alloy or the like is , The weight of the metal wire leads to an excessive load on the overhead wire, which has a large effect on the sag tension of the wire in the span, and also causes corona noise due to the deposition of raindrops during light rain. In order to improve this, the applicant of the present invention firstly embedded an insulating coated reinforced plastic wire rod in which a hard plastic insulating reinforced core material is coated with an insulating layer and exposed it at a semiconductive wire contact portion. However, by forming this into a spiral shape, the corona characteristics are good, and the weight is reduced so as not to affect the sag tension of the electric wire. It was developed soil.

[0003]

The spiral rod using the insulation-coated reinforced plastic wire has the advantage of reducing the influence on the slack tension of the wire due to weight reduction. In order to spirally form a wire that is exposed in one part and embedded in the semi-conductive wire contact part, each wire must be wound around a forming rod for forming, so the forming efficiency is low, and therefore the cost is low. There is a problem that it becomes high.

The present invention solves the above-mentioned problems and provides a method for producing a wind noise preventing spiral rod for electric wires, in which the spiral forming operation is made highly efficient and a large number of spiral rods can be easily produced. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, a method for producing a wind noise-preventing spiral rod for electric wires according to the present invention comprises: impregnating a core material 1 of a reinforcing fiber wire bundle with a thermosetting polymer unpolymerized resin. Fiber core strip 3 impregnated with material 2 and impregnated with unpolymerized resin
And the unpolymerized resin impregnated fiber core strip 3
Of the long filament 5 by coating the synthetic resin of the fiber bundle core comprehensive coating 4 on the outer periphery of the above, and heat, cold and weather resistance of the corona prevention outer coating 6 on the outer periphery of the long filament 5. Of a linear molding rod material 10 by extruding and coating a flexible resin on a substantially triangular cross section having a square edge with an arc surface, and a method of winding the linear molding rod material 10 of the winding rod jig 11. A step of winding a spiral shape on a peripheral surface with a predetermined pitch, and a forming rod material 10 wound around the winding rod jig 11.
By heating to cure the unpolymerized resin-impregnated fiber core body 3 and cooling the spiral shaped forming rod material 10 in which the fiber core body 3 has been cured to solidify and form a spiral shape. The spiral rod A molded into a spiral shape is obtained.

[0006]

The fiber core strip 3 impregnated with the thermosetting unpolymerized resin is not polymerized in the impregnating material, so that when the fiber core strip 3 is treated together with a large number of other fiber core strips 3, the fiber core strips 3 are mutually separated. Although they stick to each other, by wrapping the outer circumference of the unpolymerized resin-impregnated fiber core strip 3 with the fiber bundle core comprehensive coating 4, the fiber core strips 3 do not stick to each other and handling becomes easy and moldability is improved. To do.

A rod jig 11 for winding the molded rod material 10
The unpolymerized resin-impregnated fiber core strip 3 is cured in the spiral shape by heating while heating the peripheral surface of the core in a spiral shape with a predetermined pitch. The spirally-cured core body 3 serves as a core body that holds the spiral shape of the spiral rod.

Since the winding rod jig 11 can wind a large number of forming rod materials 10, the spiral forming has a high efficiency and a large number of spiral rods can be easily manufactured.

By cooling the molded rod material 10 in which the fiber core strip 3 is hardened in a spiral shape, a spiral rod solidified in a spiral shape can be obtained.

Wind noise is prevented by winding the manufactured spiral rod around an electric wire. In addition, the outer coating 6 having a substantially triangular cross-section with the corner edges of the corona-preventing outer coating 6 having a circular arc surface prevents large raindrops from adhering to the spiral rod wound around the electric wire, reduces corona noise, and reduces corona noise. Improves the characteristics.

Since the spiral rod is made of plastic, it does not exert an excessive load on the wound electric wire and does not significantly affect the sag tension.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a wind noise preventing spiral rod for electric wires according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing each part of a wind noise preventing spiral rod for electric wire manufactured by the method of the present invention. For convenience of explanation, each part of a core material 1, a core body 3, a coating 4, and a filament body 5 is covered 6 Although it is illustrated as projecting to the left from the end surface of the above, the actual product is one in which all the end surfaces coincide with the end surface of the coating 6.
FIG. 2 shows the end face of the spiral rod. In the figure,
Reference numeral 1 is a core material of a reinforcing fiber bundle formed into a long filament by glass fiber, carbon fiber, polypropylene fiber or the like. Reference numeral 2 is an impregnating material of a thermosetting polymer unpolymerized resin such as an epoxy resin or a phenol resin, and a core material 1 of a reinforcing fiber bundle.
Then, a semi-solid unpolymerized resin-impregnated fiber core 3 is produced by impregnating with the above.

Reference numeral 4 denotes the unpolymerized resin-impregnated fiber core strip 3
It is a fiber core encapsulation coating that is coated on the outer periphery of the fiber core as a primary coating.
Cover with polyethylene, silicone resin, fluorine resin, etc. The fiber bundle core comprehensive coating 4 is coated on the fiber core strip 3 to produce a long linear strip 5. The fiber core strip 3 impregnated with the unpolymerized resin is sticky and sticks because the resin is not polymerized, but the fiber core strip 3 is covered with the fiber bundle core comprehensive coating 4 to form a fiber core strip. Prevent sticking to each other while handling body 3.

Reference numeral 6 denotes a corona-preventing outer coating which is provided as a secondary coating on the outer periphery of the above-mentioned primary coating of the fiber bundle core, which is heat-resistant, cold-resistant and weather-resistant, such as nylon, polyamide resin, and fluorine resin. Extrude and coat a resin with excellent properties. As shown in the figure, the corona-preventing outer coating 6 has a cross-sectional shape in which the corners of the top of the triangle are formed into arcuate surfaces 7, and the lower half both corners are formed into arcuate surfaces 8 and 8. The half portion is formed into a saddle shape, and the bottom surface thereof is formed into an electric wire contact curved surface 9 that substantially matches the circular curved surface of the electric wire surface. Such a shape of the outer coating 6 is such that each ridge of the rod having a substantially triangular cross section becomes a rod having an arc surface, and the corona characteristic becomes good when the spiral rod is wound around the electric wire. The corona-preventing outer coating 6 is coated on the outer circumference of the fiber bundle core covering coating 4 to manufacture a linear shaped rod material 10.

As described above, the core material 1 of the reinforcing fiber bundle is covered with the unpolymerized resin-impregnated fiber core strip 3 impregnated with the thermosetting polymer unpolymerized resin and the fiber bundle core comprehensive coating 4 to cover the core material 1. The linear filament 5 is formed, and the linear shaped rod material 10 coated with the corona preventive outer coating 6 is wound around the winding rod jig 11 as shown in FIG.

The winding rod jig 11 is shown in a front view of FIG.
As shown in FIG. 4 and the end view, the rod-shaped body is a metal rod-shaped body having a circular cross-section, and pins 12 and 13 are provided alternately on opposite sides of the rod-shaped body in the longitudinal direction at a predetermined pitch P. The pitch P of the pins 12 on the same side of the rod-shaped body is a pitch corresponding to the pitch of the spiral rod. The outer diameter d of the rod-shaped body of the winding rod jig 11 is set to d = 0.7D to 0.8D with respect to the diameter D of the overhead wire around which the spiral rod is wound. Since a spiral rod is wound around the outer peripheral surface of the winding rod jig 11 to be spirally formed as described later, the inner diameter of the spiral of the formed spiral rod is the same as that of the winding rod jig 11 described above. The diameter will be the same as the diameter d.

On the peripheral surface of the winding rod jig 11 shown in FIG.
As shown in the front view of FIG. 6 and the end view of FIG.
The electric wire contact curved surface 9 on the bottom surface of the wire is wound inside the winding so as to contact the peripheral surface of the jig.
By winding 3 as a guide in a spiral shape, a spiral shape having the same pitch as the pitch P of the pins can be wound. To wind a large number of forming rod materials 10 around the winding rod jig 11,
The forming rod material 10a in which the second forming rod material 10a is spirally wound around the peripheral surface of the winding rod jig 11 using the pins 12 and 13 as guides, and then the second forming rod material 10b is wound around the above-mentioned tip. Wrapped side by side in parallel,
In the same manner, the forming rod materials 10c, 10d, 1
0e ... are wound in parallel, and both ends of the wound forming rod material 10 are fixed to the winding rod jig 11 by binding and other fixing tools 14 and 15 and Hold the edges so that they do not fray.

As described above, a plurality of molded rod materials 10
The wound rod jig 11 wound with is put in an oven furnace or the like and heated to cure the unpolymerized impregnated resin of the unpolymerized resin-impregnated fiber core strip 3. The heating time required for curing the unpolymerized resin-impregnated fiber core 3 is 6 mm in height h, 7 mm in width w, and 3 mm in diameter of the core 3 shown in FIG. In this case, heating is performed at 100 to 140 ° C. for about 30 minutes. The plurality of molded rod materials 10 spirally wound around the circumferential surface of the winding rod jig 11 cures the thermosetting unpolymerized resin impregnated material by this heating, and the circumference of the winding rod jig 11 is cured. It is fixed in a spiral shape on the surface.

After heating a plurality of forming rod materials 10 wound around the peripheral surface of the winding rod jig 11 as described above, they are cooled by air cooling or water cooling. After the cooling, each forming rod material 10 is removed from the winding rod jig 11, and as shown in FIG. 7, each forming rod material 10 is formed into a spiral shape and solidified, and the wind noise preventing spiral rod A for electric wire
Is obtained. The inner diameter d of the spiral of the spiral rod A is the same as the outer diameter d of the winding rod jig 11 wound into a spiral, and d = d with respect to the wire diameter D.
Finished to an inner diameter of 0.7D-0.8D. By forming the spiral rod A with such an inner diameter, it is possible to obtain a sufficient gripping force when the spiral rod A is wound around an electric wire having a diameter D. The pitch P of the spiral rod A is the same as the pitch P of the pins 12 and 13 of the winding rod jig 11. The length of this spiral rod A is 2
It is formed to m to 3 m.

FIG. 8 shows a state in which the wind noise-preventing spiral rod A for electric wire manufactured as described above is wound around the peripheral surface of the electric wire B, and the electric wire B is installed in a space between the overhead electric wire supporting towers. To the spiral rod A having a length of 2 to 3 m described above,
AA ... is brought into contact with the surface of the electric wire B with the electric wire contact curved surface 9 on the bottom surface of the corona preventing outer coating 6 inside the winding, and is wound at the end A ′ and wound in a spiral shape in order.
In the overhead wire around which the spiral rod A is wound in this way, the Karman vortex generated when the wind blown on the side surface of the wire separates from the surface of the wire on the opposite side is disturbed. S × V / D) is remarkably eliminated, and wind noise is reduced. For example, if the wire diameter is 30 mm and the wind speed V is 15 m / s, the Strouhal number S is 0.2.
The predominant frequency is f = 100 Hz, and such a low frequency has little distance attenuation and causes annoying noise pollution, but wind noise is prevented by winding the spiral rod A as described above.

The corona-preventing outer coating 6 of the spiral rod A has a cross-sectional shape as shown in FIG. 2, so that the raindrops formed on the surface during light rain are small. Therefore, the corona characteristics are improved and the corona noise due to the generation of corona is reduced.

[0022]

As described above, according to the method for producing the wind noise preventing spiral rod for electric wire of the present invention, the core material of the reinforcing fiber wire bundle impregnated with the unpolymerized resin is wrapped with the fiber core entrapping coating to obtain the unpolymerized resin. The impregnated fiber cores do not stick to each other and are easy to handle, improving moldability.

By heating the molded rod material in a spirally wound state on the peripheral surface of the winding rod jig, the unpolymerized resin-impregnated fiber core strip can be cured in the spiral shape, By cooling this, a spiral rod solidified into a spiral shape can be manufactured.

Further, since a large number of forming rod materials can be wound around the winding rod jig, the spiral forming can be made highly efficient, and a large number of spiral rods can be easily manufactured.

Further, since the corona-preventing outer coating on the outer periphery of the long filament is formed in a substantially triangular cross-sectional shape with square edges, large raindrops are attached to the spiral rod wound around the electric wire. To prevent corona noise and reduce corona noise to improve corona characteristics. Moreover, since the spiral rod is made of plastic, the looseness tension is large without applying an excessive load to the wound wire. The wind noise of the overhead wire can be prevented without affecting.

[Brief description of drawings]

FIG. 1 is an explanatory view of a spiral rod of the present invention.

FIG. 2 is an end view of the spiral rod of the present invention.

FIG. 3 is a front view of a winding rod jig used in the method of the present invention.

FIG. 4 is an end view of a winding rod jig used in the method of the present invention.

[Fig. 5] A state diagram in which a rod material is wound around a winding rod jig.

FIG. 6 is an end view showing a state where a rod material is wound around a winding rod jig.

FIG. 7 is a front view of the spiral rod.

[Fig. 8] A state diagram in which a spiral rod is wound around an electric wire.

[Explanation of symbols]

 1: Core material of reinforcing fiber bundle 3: Unpolymerized resin impregnated fiber core strip body 4: Fiber bundle core comprehensive coating 5: Long filament body 6: Corona-preventing external coating 10: Molded rod material 11: Wound rod jig A: Spiral rod

Claims (1)

[Claims] 1. An unpolymerized resin-impregnated fiber core strip (3) obtained by impregnating a core material (1) of a reinforcing fiber bundle with a thermosetting unpolymerized resin is coated with a synthetic resin of a fiber bundle core comprehensive coating (4). Extrude coating to fabricate a long filament (5), and use a synthetic resin for corona-preventing outer coating (6) on the outer periphery of the long filament (5) described above, with the corner edges being approximately three-sided arcs. Extrude and cover the shape cross-section to produce a linear forming rod material (10), wrap the forming rod material (10) around the winding rod jig (11) in a spiral shape, and form the forming The rod material (10) is heated to cure the unpolymerized resin-impregnated fiber core (3), and the spiral shaped rod material (10) in which the fiber core (3) is cured is cooled. A method for manufacturing a wind noise-preventing spiral rod for electric wires, which comprises solidifying and molding into a spiral shape.