JPH06105562B2 - Grounding wire and its manufacturing equipment - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a grounding lowering wire that is drawn out from various electric devices and the like on a utility pole, and a manufacturing apparatus thereof.

[Conventional technology and its problems]

As shown in FIG. 15 and FIG. 16, an electric wire P ′ for pulling down the ground is pulled down from various electric devices of the electric pole H, and the electric wire P ′ has a pipe-shaped or concave vinyl chloride (PVC) cross section.
C) Earth Mole M is covered. In this work, in the case of the pipe shape, the electric wire P'is drawn through the earth molding M and attached to the electric pole H, and in the case of the concave section, the electric wire P '.
Is attached to the utility pole H, and the earth molding M is put on it (first
(Fig. 16), both of them had the earth molding M fastened with a steel band, etc., and the work was complicated, and improvement was desired.

On the other hand, in the electric wire, a technique of making the cross-sectional shape of the outer cover triangular in order to make it easier to fit (Japanese Utility Model Laid-Open No. 58-159007, Japanese Utility Model Laid-Open No. 61-193635), and the tailing surface is arc-shaped. There is technology (Japanese Utility Model Publication No. 61-1212).

Under such circumstances, the applicant of the present invention has disclosed in Japanese Patent Application No. 63-101445 (Japanese Utility Model Publication No. 2-24458), “As shown in FIG. 13,“ insulating core wire in which insulating coating 1b is applied to conductor 1a ”. An electric wire for lowering the ground P ″, which is formed by applying a flat trapezoidal protective sheath (outer sheath) 2 having an arc bottom surface on the upper surface of the wire 1, has been proposed. The electric wire P ″ is attached by applying the bottom side 2a of the outer cross section 2 to the utility pole H.

However, the electric wire P ″ of the present invention has a problem that a large amount of resin is required to form the protective jacket 2 and that the terminal / connection processing after removing the protective jacket 2 is difficult.

Further, it is extremely difficult to extrude the electric wire P ″ (jacket) of the present invention. Specifically, while the insulating core wire 1 has a circular cross section, the jacket 2 has an uneven cross-sectional shape. Since it has a flat trapezoidal shape or a crescent shape, the thickness of the jacket 2 that surrounds the insulating core wire 1 is thin above and below the insulating core wire 1 and extremely thick on both sides.

On the other hand, when manufacturing the electric wire P ″, the conventional extrusion molding coating of the jacket 2 on the insulating core wire 1 is performed on the inner surface of the cross head (not shown) of the extruder as shown in FIG. A die 5 having a land 4 having a crescent shape or a flat trapezoidal cross section is mounted on a die holder (not shown), and a nipple 6 is provided in the die 5 and a required resin flow is provided between the surrounding dies 5. Arranged so that the passage 7 is formed and its nipple 6
The insulating core wire 1 is passed on the center line of the
Is performed by supplying the resin a.

For this reason, a difference between the thickness of the upper and lower portions of the insulating core wire 1 of the jacket 2 and the thickness of the both side portions thereof occurs over substantially the entire length of the flow path 7, so that the upper and lower portions of the insulating core wire 1 and both sides thereof are In the portion, the flow of the resin a at the time of the extrusion molding (in the resin flow path 7) and the expansion degree (absolute amount) of the resin a after being extruded are extremely different from each other, and the die land 4 Even if the inner surface is formed in a desired crescent shape or flat trapezoidal shape, the extruded jacket 2 does not show expansion of the resin a in the vicinity of the insulating core wire 1 as shown by the chain line in FIG. Since the resin thickness is large on both sides of the insulating core wire 1, there is a problem that the resin a of the portion released from the extrusion pressure expands and is not finished in a good shape.

In the shape of the chain line in FIG. 13, the bottom surface 2a thereof does not closely follow the surface of the electric pole H, which is not aesthetically pleasing and is apt to be mischievous by sticking a rod into a raised void.

By the way, as a means for reducing the thickness of the jacket 2 described above, there is a cavity (Japanese Utility Model Laid-Open No. 54-71681), and there is also an apparatus for manufacturing an electric wire having this cavity (Japanese Patent Laid-Open No. 2004-71681) 57-95019).

Generally, in the process of connecting electric wires, the jacket is peeled off from the insulating core wire, but if the jacket covers the entire circumference of the insulating core wire, the insulating core wire is damaged when the jacket is cut. There is a fear.

Under the above-mentioned technical background, the present invention provides that the above-mentioned outer cover having a crescent-shaped cross section or a flat trapezoidal shape has an ideal shape after extrusion molding around the insulating core wire, and the resin of the outer cover. An object of the present invention is to reduce the amount as much as possible, to prevent the insulating core wire from being easily scratched at the time of connection processing, and to provide an electric wire manufacturing apparatus having those advantages.

[Means for Solving the Problems]

In order to solve the above problems, in the ground pulling down electric wire according to the present invention, in the electric wire shown in FIG. 13, the outer cross section of the outer cover is a frame shape, and holes are formed on both sides of the insulating core wire. In addition to the above, the holding ribs that sandwich the insulating core wire are provided on the inner surface of the outer cover of the hole, and the ribs are not continuous with the facing surface.

According to the manufacturing apparatus of the present invention, in the manufacturing apparatus of the above-mentioned ground pulling down electric wire, when the nipple is mounted on the die, a pair of triangular cross-sections having substantially the same gap as the inner surface of the die land is formed. The resin flow suppressing blade is provided symmetrically with respect to the insulating core wire and in contact with the insulating core wire over the entire length thereof, and protrudes from the front surface of the nipple to the downstream side from the front end of the die land.

The resin flow suppressing blade may be formed with a lengthwise air feed hole opening at its tip, and the feed hole may be configured to communicate with the outside air through the nipple inner hole and the nipple holder inner hole. it can.

The air supply hole may be an air supply groove formed over the entire length in the longitudinal direction by opening the tip of the surface in contact with the insulating core wire. When forming the air supply hole and the air supply groove, it is not always necessary to project the resin flow suppressing blade from the die land. Further, at the rear end of the nipple holder, an air feeding jig communicating with the inner hole may be fitted, and the jig may be provided with an air supply source, a dehumidifying means and a constant pressure regulator.

On the downstream side of the extrusion die, a sizing die can be arranged in close proximity, and the sizing die has a land of the same transverse shape formed on the same axis as the land of the extrusion die, and cooling. The pipe may be attached.

Further, on the downstream side of the sizing die, a wire drawing machine from the sizing die and a fixed length cutting machine into which the electric wire from the drawing machine is continuously fed can be provided in order. May have the following configuration.

A guide jig having a guide hole through which the electric wire from the take-up machine is fed and penetrates is attached to a frame, and a cutting machine for cutting the traveling electric wire is provided on a frame at a subsequent stage in the electric wire penetrating direction of the jig, On the downstream frame of the electric wire penetrating direction of this cutting machine, a box-shaped rail with a U-shaped cross section having a downward opening or a lateral opening is provided, and the back surface of the box rail is on the axis of the electric wire penetrating direction. Positioned and provided with an electric wire retention means in the opening of the box rail, the cutting machine,
A constant length cutting machine comprising means for moving the cutter in the opening direction of the box rail when the electric wire penetrates the through hole of the guide jig by a required length.

[Action]

In the electric wire configured as described above, the presence of the holes allows the thickness of the outer cover to be substantially the same over the entire area, and bulges on both sides of the insulating core wire do not occur.

At the time of terminal treatment such as connecting to a grounding wire from electric equipment on a telephone pole, make a required length in the longitudinal direction from the both sides of the outer jacket to the hole, and protect the outer jacket through the notch. The insulated conductor is divided into two parts to expose the insulated conductor, and the exposed insulated conductor is connected to a ground wire from an electric device or the like on a utility pole. At the time of forming the cut, the presence of the holes makes it less likely that the cutting tool will reach the insulated conductor. Further, when the insulating core wire is exposed, since the rib is not continuous to the facing surface, the rib portions are easily peeled off from the insulating core wire by bending the two-divided jackets to the opposite sides.

In the manufacturing apparatus, an electric wire having holes on both sides of the insulating core wire is manufactured by suppressing the resin pressure from the die by the resin flow suppressing blade. At this time, in the resin flow suppressing blade having the air supply hole or the supply groove, the air smoothly flows into the hole through the hole or the groove.

In the case where the sizing die is provided, the electric wire extruded by the die is shaped while being cooled and hardened to have a more ideal shape.

Further, if a take-up machine and a standard length cutting machine are provided, the electric wire from the sizing die is fed into the guide jig of the standard length cutting machine via the take-up machine and travels through the cutting machine in the rail. When the amount of progress reaches the required length, the cutter moves to cut the electric wire. At this time, since the electric wire is pushed in the opening direction of the box rail, the cutting machine side of the wire in the box rail moves to the opening side, and a space is created on the wire feeding shaft. For this reason, the electric wire sent next enters the space,
Proceed while pushing the wire in front. This operation is repeated, and the electric wire which reaches the opening of the box rail is discharged downward from the opening.

〔Example〕

 Grounding-down electric wire First, the grounding-down electric wire will be described.

An embodiment is shown in FIG. 1, in which 1 is a conductor.
An insulating core wire 1a on which an insulating coating 1b of vinyl chloride (PVC) is applied is provided with a jacket 2 having a crescent frame shape or a flat trapezoidal frame shape around the insulating core wire 1. Both sides of the insulating core wire 1 of the jacket 2 are holes 3 having a substantially triangular cross section, and the jacket 2 around the holes 3 has substantially the same thickness. As the outer cover 2, various known materials such as hard polyethylene and PVC (HDPE) can be adopted.

Retaining ribs 2b are continuously provided in the longitudinal direction above and below the inner surface of the hole 3 of the jacket 2 so as to sandwich the insulating core wire 1, and the upper and lower ribs 2b and 2b are not continuous (rib 2b Is not continuous with the facing surface), the insulating core wire 1 is easily disengaged (peeled) from the ribs 2b and 2b when the outer cover 2 is divided into upper and lower parts, as described later.

This embodiment is configured as described above, and in the factory, for example, the length is cut to about 3.3 m in advance, the outer sheath 2 is removed at the inner sides of both ends of 15 cm, and the insulation coating 1b of the insulation core wire 1 is further removed.
Peel off about 2 cm. At the time of this peeling, as shown by the chain line in Fig. 2, if the slits (cuts) 2c are formed at both ends of the jacket 2 in the required length direction (front-back direction of the paper), the jacket 2 may be split up and down. it can. Therefore, the insulating core wire 1 can be removed from between the holding ribs 2b and laterally displaced. In this state, when the jacket 2 is cut at the end of the slit 2c perpendicularly to the length direction, the terminal treatment can be performed without damaging the insulating core wire 1 at all.

The electric wire P that has been subjected to this terminal treatment is brought to the site, and is connected to the ground wire pulled down from the distribution line system at a position higher than the reach of a passerby as in the conventional case, and the connection portion is insulated. After that, the electric wire P is on the bottom side of the outer cross section.
Pull down 2a while applying it to the surface of the utility pole, tighten and fix it with a steel band at appropriate intervals, and connect the lower end to the ground rod.

Electric Wire Manufacturing Device Next, a manufacturing device for the electric wire P will be described.

In this embodiment, as shown in FIG. 2, an insulated core wire 1 is fed from a supply A to an extrusion molding machine B to cover an outer cover 2 to form an electric wire P. The electric wire P is a sizing die C and a cooling tank. D, a take-off machine E, and a fixed-length cutting machine F are run to manufacture a fixed-length grounding-down electric wire P. The process is as follows.
It is controlled by the control panel G.

As shown in FIG. 3, the extruder B has a die holder DH of the crosshead CH of the extruder with a crescent-shaped or flat trapezoidal inner surface, that is, the cross-sectional shape of FIG. Extrusion Die 31 Formed Land 30
Is installed. The die 31 is aligned by adjusting the screwing amounts of the bolts f at equidistant positions on the periphery.

Inside the die 31 and the die holder DH, a nipple 32 through which the insulating core wire 1 passes is arranged so that a required resin flow path 33 is formed between the peripheral die 31 and the die holder DH. This nipple 32 is screwed and fixed to the nipple holder NH, and the bolt f of the nipple holder NH is fixed.
The tip position of the nipple 32 is adjusted by adjusting the screwing amount of. Therefore, the size of the resin flow path 33 can be adjusted by moving the nipple 32 back and forth as shown by the arrow a in the figure, and the size of the resin flow path 33 should be considered in consideration of the type of resin, the thickness of the jacket 2, and the like. And set it appropriately.

On the front surface of the nipple 32, a pair of resin flow suppressing blades 34 having a triangular cross section as shown in FIG. 4 is projected, and when the nipple 32 is mounted on the nipple holder NH, the opposing surface thereof is It is in contact with the insulating core wire 1 over the entire length and has a gap t which is almost the same as the inner surface of the die land 30, and its tip is land
30 Projects downstream from the front end. The amount of protrusion b of the suppression blade 34
Is appropriately set through experiments or 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 blade 34 can be moved in the axial direction with respect to the nipple 32 by fitting or the like, and only that can be moved in the axial direction, or the nipple integrated with the blade 34.
Move 32 in the axial direction. The resin flow suppressing blade 34 is formed with a lengthwise air supply hole 39 opening at its tip.

An air supply jig 40 is attached to the rear end of the nipple holder NH, and the insulating core wire 1 is airtightly inserted into the air supply jig 40 via a packing 41 to form an inner hole of the nipple holder NH.
42, and is guided to the downstream side through the inner hole 43 of the nipple 42. A compressor 46 is connected to the air supply jig 40 via a constant pressure regulator 44 and a dehumidifying air filter 45. From this compressor 46, air is supplied as indicated by an arrow to the air supply jig 40 and the nipple holder inner hole 42. The air is fed into the air feed hole 39 through the nipple inner hole 43, and the air is supplied to the holes 3 of the jacket 2.

A sizing die C is arranged close to the downstream side of the extrusion molding die 31. This die C has a land 36 having the same axis and the same transverse shape as the land 30 of the die 31.
And a cooling pipe 37 is attached. Water of an appropriate temperature circulates through the cooling pipe 37, and the die C is cooled by this hot water. In addition, in land 36,
A tetrafluoroethylene polymer (for example, DuPont, USA: trade name Teflon) 38 is coated, and the electric wire P after extrusion is smoothly moved by this coating layer.

This extruder B has the above-mentioned configuration, and now the take-up machine E
As shown in FIG. 3 and FIG. 4, the insulation core wire 1 is fed onto the central axis of the nipple 32 by
When the resin a is supplied to the flow passage 33, the insulating core wire 1 is coated with the outer cover 2 having a shape crossing the inner surface of the land 30, as in a general extruder.

At this time, the resin flow suppressing blade 34 suppresses the pressure of the resin a that has exited the die 31, and further the resin a that has exited the die 31.
The (outer cover 2) is provided with air holes 3 on both sides of the insulating core wire 1 shown in FIG. An electric wire P having a cross-sectional shape is obtained.

The extrusion molding machine B shown in FIGS. 5 and 6 is the same as the extrusion molding machine B shown in FIGS. 3 and 4 except that the air feed hole 39 is formed on the surface of the resin flow suppressing blade 34 which is in contact with the insulating core wire 1. The groove is opened, and the electric wire P of FIG. 1 is manufactured by the same operation as described above except that the air is sent to the hole 3 through the air feeding groove 39.

The extruder B shown in FIGS. 7 and 8 has an air supply hole 39,
The air supply groove 39 is not formed, and in this case, the air is supplied from the tip of the nipple 32 to the hole 3 through the inner hole 43 of the nipple 32. At this time, if the outer cover 2 having a desired cross-sectional shape is obtained without reaching the resin flow suppressing blade 34 to the sizing die C, as shown in FIG. The quantity b) may be short.
The same applies to the resin flow suppressing vanes 34 shown in FIGS. 3 and 5.

The electric wire P molded by the extrusion molding machine B and the sizing die C as described above passes through the cooling tank D and then the take-up machine E.
Taken over by. That is, the take-up machine E has a well-known structure, and as described above, the take-up action causes the insulating core wire 1 to be fed from the supply A onto the central axis of the nipple 32 of the extrusion molding machine B to cause the above-mentioned extrusion. Molding is done.

The electric wire P taken by the take-up machine E is sent to the downstream fixed-length cutting machine F. As shown in FIG. 10, this constant-length cutting machine F has an electric wire P extending from one end of a machine base (apparatus frame) 11.
A rectangular box pillar 12 with an open entrance is provided.
A cutting box 13 is provided on a base 12b on the inner surface of the open portion 12a so as to be slidable forward and backward with respect to the path of the electric wire P (in the direction of the arrow).

On the upstream side of the electric wire P path of the cutting box 13, a blade receiver 15 serving as a guide jig for receiving the electric wire P is provided with a clearance adjusting nut.
It is inserted by 18 so that forward and backward adjustment is possible. In addition, 18a is a washer and 18b is a lock nut.
After adjusting the clearance with 5, receive the blade with the lock nut 18b.
Fix 15

A square hole 13a for slidably receiving the blade support rod 14 is formed in the direction perpendicular to the center of the cutting box 13. The blade support rod 14 has a shape shown in FIG. 12 and is inserted from the lower part of the rectangular hole 13a so that the overhanging part 14a of the lower part hits the lower surface of the cutting box 13 and cannot pass through.

When the blade support rod 14 is inserted into the cutting box 13, the pin 19a is inserted into the pin hole 14b of the blade support rod 14, and the torsion spring 19 is interposed between both projecting ends of the pin 19a and the upper surface of the cutting box 13. Then, the blade support rod 14 is pulled up. Blade support for blade support rod 14
A dovetail groove 14c is engraved on the surface against 15 and a blade 17 having the outer diameter of the dovetail is fitted. 16 is an anvil.

On the downstream side of the cutting box 13, a wire guide box rail with a U-shaped cross section is provided.
22 (hereinafter referred to as a box rail) are arranged in series, and springs 27 for retaining the electric wires P in the box rail 22 at appropriate intervals in the lengthwise direction are attached so as to sandwich the opening of the box rail 22. ing. As shown in FIG. 11 (a), one end of the inner surface of the rail 22 (on the right side of the blade receiver 15 in FIG. 10) is separated from the back surface by the thickness r of the electric wire P (see FIG. 1). A rib 26 is provided to prevent the blade 17 described later from returning upward when the wire P descends. Also, the rail
A cutting strip length setting piece 25 is provided on the other end side of 22 so as to be movable and fixed in the length direction. This setting piece 25 is screwed at a required position, and the electric wire P is fed into the box rail 22 and When the tip hits the setting piece 25, the box rail 22 and the cutting box 13 move as the electric wire P advances. Reference numeral 23 in the figure denotes a support roller for the box rail 22.

A cross stroke mechanism 21 is provided on the upper portion of the rectangular box column 12, and the hammer 20 always reciprocates up and down by the mechanism 21. In the cross stroke mechanism 21, an eccentric shaft 21c fixed to an axial center shaft 21a of a normally rotating flywheel W is fitted in a hole of a slider 21b in a block 20a of the hammer 20, and the eccentric shaft 21c rotates. As a result, the slider 21b moves laterally and vertically as shown by the chain line in FIG. 10 to push down the block 20a, that is, the hammer 20.
Therefore, when the upper surface of the anvil 16 is opposed to the lower side of the hammer 20 (chain line in FIG. 10), the upper surface of the anvil 16 is hammered.
It is struck by 20 and the anvil 16 or blade support rod 14 descends and the electric wire P is cut.

This fixed-length cutting machine F has the above-described configuration, and at the start of work, first, as shown in FIGS. 11 (a) and (b), the electric wire P that has been cut in advance is filled and retained in the box rail 22. The wire is prevented from bending when the tip of the wire P to be fed next hits the cut strip length setting piece 25.

From this state, when the electric wire P is sent from the take-up machine E to the blade receiver 15, the electric wire P enters the box rail 22 and hits the cutting length setting piece 25, and the spring is set through the setting piece 25.
The box rail 22 and the cutting box 13 are moved to the left in FIG. 10 against 24. This movement is performed without bending the electric wire P because the outer cover 2 is made of hard resin. When the amount of movement is a fixed amount, that is, when the feed length from the blade 17 becomes 3.3 m, the anvil 16 is positioned below the hammer 20 and is struck as shown by the chain line in the figure, and the blade support rod 14 descends. Then, the electric wire P is cut to a fixed length by the blade 17 and the blade receiver 15.

At the time of this cutting, the blade 17 pushes the electric wire P downward, so that the cutting box 13 side of the electric wire P in the box rail 22 descends and the state is maintained by the ribs 26, as shown in FIG. 14 (a). A space S is generated at the feeding level of the electric wire P. Therefore, after the cutting, the box rail 22 and the cutting box 13 are returned by the spring 24, but the electric wire P sent next enters into the space S (state of the chain line in FIG. 11 (a)). Proceed while pushing down the electric wire P in front. When this action is repeated, the electric wires P facing the opening on the lower surface of the box rail 22 push out the claws 27a of the spring 27 from the opening and are sequentially discharged into the machine base 11 (chain line state in FIG. 11).

In this constant length cutting machine F, a reciprocating driving machine such as an air cylinder or an electromagnetic plunger can be adopted instead of the cross stroke mechanism 21.

Further, when the electric wire P is extruded with its long side vertical (upper and lower), the standard length cutting machine F is placed horizontally, the cross stroke mechanism 21 is placed horizontally, and the opening of the box rail 22 is oriented horizontally.

〔The invention's effect〕

Since the ground pulling-down electric wire according to the present invention is configured as described above and has the holes formed in the outer cover, the shape thereof can be made to fit the utility pole exactly. It's good and it's hard to be mischievous. Furthermore, since there are holes, it has the effect of saving resin for the jacket, and because the insulating core wire is supported by being sandwiched by ribs, the insulating core wire is easily dislocated from the jacket, making terminal processing easier. There is an advantage that there is little risk of damaging the insulating core wire.

Further, the manufacturing apparatus according to the present invention has an effect of being able to manufacture an electric wire having such a preferable shape smoothly and without deformation.

Furthermore, if a take-off machine and a standard length cutting machine are provided, the electric wire can be obtained with a standard length. At this time, if the standard length cutting machine has a box rail, etc., it will be cut in the box rail. Since the electric wires that have been formed are supported and appropriately paid out, it is not necessary for a person to always attach them, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of an electric wire for grounding reduction according to the present invention, FIG. 2 is a schematic view of an embodiment of a manufacturing apparatus of the same embodiment, and FIG. 3 is an extruder of FIG. FIG. 4 (a) is a perspective view of the nipple of FIG. 3, FIG. 4 (b) is a left side view of the resin flow suppressing blade of FIG. 5, FIG. 5, FIG. 7, FIG. The figure is a schematic cross-sectional view of another example of the extruder of FIG. 2, FIG. 6 (a) is a perspective view of the nipple of FIG. 5, and FIG. 6 (b) is the left side of the resin flow suppressing blade of FIG. FIG. 8 is a perspective view of the nipple of FIG. 7, FIG. 10 is a front view of a main part of the constant-length cutting machine of FIG. 2, and FIG. 11 is a right side view of cutting of FIG. The same figure (a)
Is an A-A cross section, FIG. 12B is a BB cross section, and FIG.
Fig. 13 is a perspective view of the blade support rod and blade shown in Fig. 13, Fig. 13 is a cross-sectional view of a conventional grounding-down electric wire, Fig. 14 is a cross-sectional view of the main part of a conventional example of an extruder, and Fig. 15 is grounding down of a utility pole. FIG. 16 is a sectional view taken along line XX of FIG. P ... Electric wire for pulling down the ground, M ... Earth molding, H ... Pole, A ... Supply, B ... Extrusion molding machine, C ... Sizing die, D ... Cooling tank, E ... Take-off machine, F …… Standard length cutting machine, G …… Control panel, CH …… Crosshead, DH …… Die holder, NH …… Nipple holder, 1 …… Insulated core wire, 1a …… Conductor, 1b …… Insulation coating, 2 …… Cover, 2b …… Holding rib, 3 …… Void, 4 …… Die land, 5 …… Die, 6 …… Nipple, 11 …… Frame, 12 …… Square box pillar, 13 …… Cutting box , 14 ... Blade support rod, 15 ... Blade support, 16 ... Anvil, 17 ... Blade, 18 ... Adjusting nut, 19 ... Torsion spring, 20 ... Hammer, 21 ... Cross stroke mechanism, 22 ... … Box rails, 24 …… Springs, 25 …… Cut strip length setting pieces, 26 …… Ribs, 27 …… Springs, 27a …… Claws, 30 …… D Sland, 31 ... Die, 32 ... Nipple, 33 ... Resin flow passage, 34 ... Resin flow suppressing blade, 36 ... Sizing die land, 37 ... Cooling pipe, 38 ... Coating, 39 ... Air feeding Supply hole (air supply groove), 40 ... air supply jig, 42 ... nipple holder inner hole, 43 ... nipple inner hole, 44 ... constant pressure regulator, 45 ... dehumidifying air filter, 46 ... compressor, 47 …… Notch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Nakatani 2-3-1 Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (56) Reference JP-A-57-95019 (JP, A) Actual Open 51-28514 (JP, U) Open 54-71681 (JP, U) Open 58-159007 (JP, U) Open 61-1212 (JP, U) Open 61-48606 ( JP, U) Actually open 61-193635 (JP, U) Actually open 2-24458 (JP, U) Actually open 3-28613 (JP, U) Actually open 3-28656 (JP, U)

Claims (9)

[Claims] 1. A ground pulling-down electric wire P comprising a synthetic resin jacket 2 provided on an insulating core wire 1 and arranged along a surface length direction of a utility pole H, wherein the jacket 2 is The cross section has a crescent frame shape or a flat trapezoidal frame shape, and the inside has a hole 3, and the insulating core wire 1 is located at the center of the hole 3 and the bottom 2a of the cross section of the jacket. Is an arc shape along the arc around the transverse section of the electric pole H,
Also, a holding rib 2b for sandwiching and supporting the insulating core wire 1 is provided on the inner surface of the outer cover 2 in the hole 3, and the holding rib 2b is not continuous to the facing surface. Electrical wire. 2. An extrusion molding die 31 having a land 30 having a crescent shape or a flat trapezoidal inner surface is mounted on the crosshead CH of the extrusion molding machine B, and the die 31 is fitted in the die 31.
A nipple 32 through which the insulating core wire 1 passes is arranged so that a required resin flow path 33 is formed between the peripheral dies 31, and the nipple 32 has a gap substantially the same as the inner surface of the die land 30. A pair of resin flow suppressing blades 34 having a triangular cross section having a cross section t is provided symmetrically with respect to the insulating core wire 1, and the resin flow suppressing blade 34 is in contact with the insulating core wire 1 over its entire length and is in contact with the nipple. 32 An apparatus for manufacturing a grounding-down electric wire, characterized in that it projects from the front surface to the downstream side from the front end of the die land 30. 3. An extrusion molding die 31 having a land 30 having a crescent shape or a flat trapezoidal inner surface is mounted on a crosshead CH of an extrusion molding machine B, and the die 31 is provided with a die 31.
A nipple 32 through which the insulating core wire 1 passes is arranged so that a required resin flow path 33 is formed between the peripheral dies 31, and the nipple 32 has a gap substantially the same as the inner surface of the die land 30. A pair of resin flow suppressing blades 34 each having a triangular cross-section with t is provided symmetrically to the insulating core wire 1 and in contact with the insulating core wire 1 over the entire length thereof, and the tip of the resin flow suppressing blade 34 is provided. An air supply hole 39 is formed in the lengthwise direction, which is opened to the air supply hole 39, and the air supply hole 39 is communicated with the outside air through the nipple inner hole 43 and the nipple holder inner hole 42. Manufacturing equipment. 4. The grounding down electric wire manufacturing apparatus according to claim 3, wherein the resin flow suppressing blade 34 is projected from the front surface of the nipple 32 to the downstream side from the front end of the die land 30. Equipment for manufacturing electric wires for pulling down. 5. An apparatus for producing a wire for grounding lowering according to any one of claims (2) to (4), wherein an air feeding jig (40) communicating with the inner hole (42) of the rear end of the nipple holder (NH). The jig 40 is attached with an air supply source 46, a dehumidifying means 45, and a constant-pressure regulator 44, which is an apparatus for manufacturing a grounding-down electric wire. 6. The grounding wire lowering wire manufacturing apparatus according to any one of claims (2) to (5), wherein a sizing die C is disposed in the vicinity of the downstream side of the extrusion molding die 31. The sizing die C has a land 36 having the same axis and the same transverse shape as the land 30 of the die 31, and a cooling pipe 37 attached thereto. . 7. The apparatus for producing a wire for ground down according to claim 6, wherein the resin flow suppressing blade 34 extends into the land 36 of the sizing die C. . 8. An apparatus for producing an earth pulling down electric wire according to claim 6 or 7, wherein an electric wire take-out machine E from the sizing die C is provided downstream of the sizing die C.
An apparatus for manufacturing a ground pulling down electric wire, which is provided with, in order, a constant length cutting machine F into which electric wires P from the take-up machine E are continuously fed. 9. The apparatus for producing an electric wire for ground down according to claim 8, wherein the constant length cutting machine F has the following constitution. A guide jig having a guide hole through which the electric wire P from the take-up machine E is fed and penetrates is attached to the frame 11, and the electric wire P running is cut on the frame 11 at the subsequent stage of the electric wire penetrating direction of the jig. A cutting machine is provided, and in the electric wire penetrating direction downstream frame 11 of the cutting machine, a box-shaped rail 22 having a U-shaped cross section with a downward opening or a lateral opening is provided. Along with being located on the axis of the wire penetration direction, a retaining means for the wire is provided in the opening of the box rail 22, and the cutting machine is provided with a wire when the wire penetrates the through hole of the guide jig for a required length. A fixed length cutting machine comprising means for moving the cutter 17 in the opening direction of the box rail 22.