JP2583196B2 - Earth mall with conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth molding with a conductor for grounding electric wires drawn from various electric devices and the like on a power pole.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, an electric wire P for lowering the ground is pulled down from various electric devices of a telephone pole H, and the electric wire P has conventionally been used to protect the electric wire P. Therefore, hard vinyl chloride (PV
C) made of Earth Mall M
17015, JP-B-63-11860, JP-A-63-48325, etc.).

[0003] In this work, in the case of a pipe, the electric wire P is drawn through the earth molding M and attached to the electric pole H. In the case of a concave cross section, the electric wire P is attached to the electric pole H and placed on the electric pole H. Cover the earth mall M (Fig. 8), and
Are fastened with steel bands or the like, and the work is complicated, and improvement has been desired.

[0004] Therefore, an object of the present invention is to simplify the above-mentioned complicated work and improve workability at the site.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a long jacket 2 having a cross section of an arc or a flat trapezoidal frame excluding its long base is removed. An earth molding with a conductive wire provided with an insulated core wire 1 in the center of the inner surface over the entire length in the longitudinal direction, wherein the insulated core wire 1 is fed into the molding machine when the outer jacket 2 is extruded and formed. The structure is such that it is provided in the jacket 2 and is tightly supported by the protective layer 2b integrally formed with the jacket 2 covering the outer surface of the insulated core wire 1.

In the protective layer 2b, a slit 3 extending from the outer surface to the insulated core wire 1 can be formed over its entire length.

[0007]

In the earth molding with conductive wires according to the present invention, the electric wire (insulated core wire 1) is attached to the telephone pole at the same time. To this end, one end of the insulated core wire 1 is connected to a down wire from an electric device on a utility pole, and the other end is grounded via a ground rod or the like.

[0008] In the terminal provided with the slit 3, at the time of terminal treatment, the insulating core wire 1 of a required length is pulled out from the slit 3, and the pulled-out jacket 2 and most of the protective layer 2 b are cut and removed. .

[0009]

FIG. 1 shows an embodiment M. In this embodiment M, an insulated core wire 1 is attached to the entire length of the center of the inner surface of a jacket 2 having an arc-shaped cross section.
The insulated core wire 1 is covered with a protective layer 20b integral with the jacket 2, and a slit 3 is formed over the entire length of the protective layer 2b. When the jacket 2 (protective layer 2b) is a soft compound, the jacket 2 (protective layer 2b) can be easily cut and peeled, so that the slit 3 does not need to be provided.

[0010] This (Earth Mall M with conductive wire)
In a factory, for example, cut to about 3.3 m in total length beforehand, and connect the insulated core wire 1 to a ground wire lowered from the distribution line system at a position higher than the reach of passersby at the site, The connection is insulated. After that, the earth molding M is pulled down while applying the bottom side of the cross section to the surface of the utility pole, and is tightened and fixed at appropriate intervals by a steel band, and the lower end of the insulated core wire 1 is connected to the grounding rod.

In this embodiment, both edges 2a of the jacket 2 are provided.
In addition, since the ribs are provided to increase the thickness, the strength is increased, and the distribution of the extrusion pressure at the time of the extrusion molding described later is made uniform, the deformation due to the expansion and contraction of the resin can be suppressed, and the warpage can be prevented. . The cross section of the jacket 2 has the shape shown in FIG.
The shape of the flat trapezoidal frame shown in FIG.

Next, the manufacturing apparatus of the earth molding M will be described. As shown in FIG. 4, an insulated core wire 1 is fed from a supply A to an extruder B to cover a jacket 2 and a protective layer 2b. The earth molding M is provided with a conductive wire, and the earth molding M is run with a sizing die C, a cooling tank D, and a take-up machine E, and the process is controlled by a control panel G.

The extruder B is, as shown in FIG.
Die holder DH for crosshead CH of extruder
An extruding die 5 having a land 4 having a crescent-shaped cross-section on the inner surface, that is, an outer cross-sectional shape shown in FIG. 1 (see a chain line in FIG. 6) is mounted. The die 5 is centered by adjusting the screwing amount of the bolt f at the circumferentially equal position.

In the die 5 and the die holder DH,
The nipple 6 through which the insulated core wire 1 passes at the center is arranged so that a required resin flow path 7 is formed between the peripheral die 5 and the die holder DH. The nipple 6 is screwed and fixed to the nipple holder NH, and the tip position of the nipple 6 is adjusted by adjusting the screwing amount of the bolt f of the nipple holder NH. Therefore, by moving the nipple 6 back and forth as indicated by the arrow a in the figure, the size of the resin flow path 7 can be adjusted.
The thickness is appropriately set in consideration of the thickness of the jacket 2 and the like.

On the front surface of the nipple 6, a pair of resin flow suppressing blades 8 shown in FIG.
When mounted on the nipple holder NH, the die land 4
The inner surface is in contact with the bottom surface of the crescent moon (see the chain line in FIG. 6, the bottom surface: reference numeral 4a), has a gap t substantially the same as the other surface and the insulating core wire 1, and the tip protrudes downstream from the front end of the land 4. . A ridge 8a is provided between the resin flow suppression blades 8 so as to protrude from the nipple 6, and the ridge 8a is in contact with the die land 4 and also with the insulating core wire 1.

The amount of protrusion b of the resin flow suppressing blade 8 and the ridge 8a is appropriately set by experiments and the like in consideration of the temperature of the resin a, the extrusion pressure and the like. The setting is such that the resin flow suppressing wing 8 and the ridge 8a can be moved in the axial direction with respect to the nipple 6 by fitting or the like, and only the nipple 6 is moved in the axial direction, or the nipple integrated with the wing 8 and the ridge 8a. 6 in the axial direction.

A sizing die C is disposed close to the downstream side of the extrusion die 5. This die C has a land 9 having the same axis and the same cross-sectional shape as the land 4 of the die 5 and a cooling pipe 10.
Is attached. A suitable temperature of water flows through the cooling pipe 10, and the die C is cooled by the hot water. In addition, the land 9 has a tetrafluoroethylene polymer (for example,
DuPont, USA, trade name: Teflon) 9a is coated, and the earth layer M after the extrusion molding is smoothly moved by this coating layer.

The extruder B has the above configuration. Now, as shown in FIGS. 5 and 6, the insulating core 1 is fed onto the center axis of the nipple 6 by the take-up machine E. When the resin a having the composition shown in Table 1 below is supplied to the flow path 7, the outer core 2 having a shape crossing the inner surface of the land 4 is coated on the insulating core wire 1 in the same manner as a general extruder. At the same time, the resin flow suppressing wing 8 and the ridge 8 a
An earth molding M in which both sides of the insulated core wire are missing, that is, an earth molding M with a conducting wire shown in FIG. 1 is extruded.

[0019]

[Table 1]

Since the width of the slit 3 is determined by the width of the ridge 8a, the width is determined in consideration of the extent to which the insulated core wire 1 can be drawn out in the case of the above-mentioned hard compounding. When the ridges 8a are integrated with the resin flow suppressing blades 8 (chain line in FIG. 2), an earth molding M having a sectional shape shown in FIG. 2 is obtained.

The earth molding M formed by the extruder B and the sizing die C as described above is taken by the take-up machine E via the cooling tank D. That is,
The take-off machine E has a well-known structure, and as described above, by the take-off operation, the insulating core wire 1 is fed from the supply A onto the central axis of the nipple 6 of the extruder B, and the above-described extrusion is performed. Done.

The earth molding M picked up by the pick-up machine E is cut into a fixed length by an appropriate means.

[0023]

According to the present invention, there is provided an earth molding with a conductive wire,
With the above configuration, an insulated core wire is attached at the same time as attaching to an electric pole or the like. For this reason, this insulated core wire can be used as a ground wire for a wire for pulling down from an electric device on a power pole, and there is no need to separately attach a wire, thereby significantly improving workability.

Further, if the slit is provided, the insulated wire can be easily pulled out from the jacket (protective layer) and made to protrude in the length direction, thereby facilitating connection terminal processing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment.

FIG. 2 is a cross-sectional view of one embodiment.

FIG. 3 is a cross-sectional view of one embodiment.

FIG. 4 is a schematic diagram of a manufacturing apparatus according to one embodiment.

FIG. 5 is a horizontal sectional view of a main part of the extrusion molding machine of FIG. 4;

FIG. 6 is a perspective view of the nipple of FIG. 4;

FIG. 7 is an explanatory view showing the attachment of a ground pulling wire in a telephone pole.

FIG. 8 is a sectional view taken along line XX of FIG. 7;

[Explanation of symbols]

 M Earth Mall H Utility Pole A Supply B Extruder C Sizing Dice D Cooling Tank E Pickup Machine G Control Board CH Crosshead DH Dice Holder NH Nipple Holder 1 Insulated Core Wire 2b Protective Layer 2 Jacket 3 Slit 4 Die Land 5 Dice 6 Nipple 7 Resin flow path 8 Resin flow suppression blade 8a Resin flow suppression ridge 9 Sizing die land 9a Coating 10 Cooling pipe

Continuation of the front page (56) References Japanese Utility Model Showa 57-109516 (JP, U) Japanese Utility Model Showa 58-186719 (JP, U) Japanese Utility Model Showa 43-17015 (JP, Y1)

Claims (2)

(57) [Claims] 1. An insulating core wire 1 is provided at the center of the inner surface of a long jacket 2 having a cross section of an arc shape or a flat trapezoidal frame excluding its long bottom side, over the entire length thereof. An earth molding with a conductive wire, wherein the insulating core wire (1) is fed into a molding machine at the time of extruding the jacket (2) and is provided in the jacket (2) and covers the outer surface of the insulating core wire (1). An earth molding with a conducting wire, which is closely supported by a protective layer 2b formed integrally with the molding. 2. An earth molding with a conductive wire according to claim 1, wherein a slit (3) extending from the outer surface to the insulated core wire (1) is formed over the entire length of the protective layer (2b).