JPH0711929B2 - Manufacturing equipment for grounding wire - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for manufacturing a grounding-down electric wire that is drawn from various electric devices on a utility pole.

[Conventional technology and its problems]

As shown in FIG. 9 and FIG. 10, 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.
The earth molding M made in C) is covered. This work
In the case of the pipe shape, the electric wire P'is drawn through the earth mol M and attached to the electric pole H. 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. 10), the earth molding M is fastened with a steel band or the like in both of them, and the work is complicated, and improvement is desired.

Therefore, the applicant of the present application, in Japanese Patent Application No. 63-101445,
As shown in FIG. 7, "a ground-pulling electric wire P in which a flat trapezoidal protective sheath (outer sheath) 2 having an arc bottom is provided on an insulating core wire 1 obtained by applying an insulating coating 1b to a conductor 1a. Was proposed. This electric wire P has a cross section bottom one side 2a of the jacket 2 on a utility pole H.
And attach it.

However, it is extremely difficult to extrude the utility pole P (cover) of this invention. Specifically, while the insulation core wire 1 has a circular cross section, the outer cover 2 has a flat trapezoidal shape or a crescent shape. The thickness 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 jacket 2 for the insulating core wire 1
As shown in FIG. 8, the conventional extrusion molding coating of Dice 5 includes a die 5 having a crosshead (not shown) of an extruder, in which a land 4 having a crescent shape or a flat trapezoidal inner surface is formed. It is mounted on a holder (not shown), the nipple 6 is arranged in the die 5 so that a required resin flow path 7 is formed between the peripheral dies 5, and an insulating core is placed on the center line of the nipple 6. It is performed by passing the wire 1 and supplying the resin a to the flow path 7.

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. 7, the bottom surface 2a thereof does not closely follow the surface of the electric pole H, which is not preferable in terms of aesthetics and is apt to be tampered with by sticking a rod into a raised void.

Therefore, in view of the above, in the present invention, the above-described solid-type manufacturing apparatus capable of extrusion-molding a crescent-shaped or flat trapezoidal-shaped jacket so as to have an ideal shape around the insulating core wire. The challenge is to provide.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, in the above-described apparatus for manufacturing a ground pulling down electric wire, when the nipple is mounted on a die, the gap between the insulating core wire and the die land inner surface is substantially the same. A pair of resin flow suppressing blades having a triangular cross section are provided symmetrically with respect to the insulating core wire.

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 stage subsequent to the electric wire penetrating direction of the jig. In the downstream frame of the electric wire penetrating direction of the cutting machine, a box rail is provided in the penetrating direction having a U-shaped cross section with a downward or sideways or lateral opening, and the back surface of the box rail has an axial center of the electric wire penetrating direction. Located above,
An electric wire retention means is provided in the opening of the box rail, and the cutting machine is provided with 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 for a required length. A standard length cutting machine.

[Action]

In the electric wire manufacturing apparatus configured as described above, the resin flow suppressing blade suppresses the resin pressure from the extrusion molding die to manufacture an electric wire having a required cross-sectional shape without expanding both sides of the insulating core wire. To be done.

At this time, in the case where the sizing die is provided, the electric wire extruded by the die is cooled and hardened while being shaped, and the expansion of both sides of the insulating core wire is further suppressed.

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. By repeating this action, the electric wire reaching the opening of the box shaft is discharged downward from the opening.

〔Example〕

In this embodiment, as shown in FIG. 1, an insulated core wire 1 is sent from a supply A to an extrusion molding machine B to cover an outer cover 2 to form an electric wire P, and 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. 2, the extrusion molding machine B has a crosshead (not shown, see FIG. 1) of the extrusion molding machine having a crescent shape or a flat trapezoidal inner surface crossing shape, that is, a seventh shape.
An extrusion molding die 5 having a land 4 having a cross-sectional shape shown in the figure is mounted on a die holder (not shown), and a nipple 6 through which the insulating core wire 1 passes through the center of the die 5 is placed in the die 5.
It is arranged so that a required resin flow path 7 is formed between the peripheral dies 5. The size of the resin flow path 7 is appropriately set in consideration of the type of resin, the thickness of the jacket 2, etc., and the setting is adjusted by moving the nipple 6 back and forth as shown by the arrow in FIG. , Attach it to a nipple holder (not shown) and fix it.

On the front surface of the nipple 6, a resin flow suppressing blade 8 having a triangular cross section as shown in FIG. 3 is projected, and the suppressing blade 8 has an insulating core wire 1 and a die when the nipple 6 is mounted on a nipple holder. It has a gap t that is almost the same as the inner surface of the land 4, and its tip projects to about the front end of the land 4. Although the position of the tip of the suppressing blade 8 changes depending on the temperature of the resin a and the extrusion pressure, it is almost at the front end of the die land 4, and the preload at the front end of the land 4 causes the resin a on both sides of the insulating core wire 1 to join together. Set appropriately according to experiments. The setting is performed by moving only the resin flow suppressing blade 8 in the axial direction or by moving the nipple 6 integrated with the blade 8 in the axial direction.

A sizing die C is arranged close to the downstream side of the extrusion molding die 5. This die C has a land 9 having the same axis and the same transverse shape as the land 4 of the die 5.
And the cooling pipe 10 is attached. Water of an appropriate temperature circulates through the cooling pipe 10, and this hot water cools the die C. Also, on land 9,
Polytetrafluoroethylene polymer (for example, manufactured by DuPont, USA:
The Teflon (trade name) 9a is coated, and the electric wire P after extrusion molding described later moves smoothly due to the coating layer.

The electric wire P exiting from the sizing die C is taken by the take-up machine E through the cooling tank D. That is, the take-up machine E has a well-known structure, and due to this take-out action, as shown in FIGS. 1 to 3, the insulating core wire 1 is fed from the supply A to the central axis of the nipple 6 of the extruder B. When hard resin a such as PVC or HDPE is supplied to the resin flow path 7 while the resin is being sent, the outer cover 2 of the shape crossing the inner surface of the land 4 is provided on the insulating core wire 1 as in a general extruder. Are coated. At this time, the pressure of the resin a discharged from the die 5 is suppressed by the suppressing blades 8, and the resin a (outer jacket 2) discharged from the die 5 is further suppressed.
Is cooled and hardened while being shaped by the sizing die C, and an electric wire P having a required cross-sectional shape can be obtained without expanding both sides of the insulating core wire 1 shown in FIG.

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. 4, this fixed-length cutting machine F has an electric wire P at 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. 6 and is inserted from the lower portion of the square hole 13a so that the overhanging portion 14a of the lower portion 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 an ant outline 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 provided 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. 5 (a), one end side of the inner surface of the box rail 22 (the side of the blade receiver 15 on the right side in FIG. 4) is separated from the back surface by the thickness r of the electric wire P (see FIG. 7). 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 inside 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. 4 to push down the block 20a, that is, the hammer 20.
Therefore, when the upper surface of the anvil 16 faces the lower side of the hammer 20 (chain line in FIG. 4), 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 constant length cutting machine F has the above-mentioned configuration, and at the beginning of work, first, as shown in FIGS. 5 (a) and 5 (b), the electric wire P previously cut in length 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 24 via the setting piece 25. The box rail 22 and the cutting box 13 are moved to the left in FIG. This movement is caused by the electric wire P because the jacket 2 is a hard resin.
Is done without bending. The amount of movement is a fixed amount, that is, for example, when the delivery length from the blade 17 becomes 3 m, the anvil 16 is positioned below the hammer 20 and is hit as shown by the chain line in the figure, and the blade support rod 14 descends. The electric wire P is cut to a fixed size 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 is lowered and the state is maintained by the ribs 26, as shown in FIG. A space S is generated at the feeding level of the electric wire P. For this reason, after the cutting, the box rail 22 and the cutting box 13 are returned by the spring 24, but the electric wire P fed next enters into the space S (the state of the chain line in FIG. 5 (a)). Proceed while pushing down the electric wire P in front. When this operation 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 in FIG. 5).

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 present invention is configured as described above, there is an effect that it is possible to manufacture an electric wire having a crescent-shaped or flat trapezoidal-shaped outer cross-section, smoothly and without deformation.

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

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of an apparatus for manufacturing a grounding lowering electric wire according to the present invention, FIG. 2 is a sectional view of an essential part of an extrusion molding machine of FIG. 1, and FIG. 3 is a nipple of FIG. A perspective view, FIG. 4 is a front view of a main part of the constant length cutting machine of FIG. 1, a right side view of FIG. 4 is shown in FIG. 4, and FIG. (B) is a B-B cross section, FIG. 6 is a perspective view of the blade support rod and blade of FIG. 4, FIG. 7 is a cross-sectional view of the ground pulling down electric wire, and FIG.
FIG. 9 is a sectional view of an essential part of a conventional example of an extrusion molding machine, FIG. 9 is an attached explanatory view of a grounding-down electric wire in a utility pole, and FIG. 10 is a sectional view taken along line XX of FIG. P ... Electric wire for pulling down the ground, M ... Earth molding, H ...
Utility pole, W ...... flywheel, 1 ... insulated core wire, 2 ...
Outer jacket, 4 ... Die land, 5 ... Extrusion die,
6 ... Nipple, 7 ... Resin flow path, 8 ... Resin flow suppressing blade, 9 ... Sizing die land, 9a ... Tetrafluoroethylene polymer (coating layer), 10 ... Cooling tube, 11 ...
… Machine stand (device frame), 12… Square box pillar, 13… Cutting box, 14… Blade support rod, 15… Blade support, 16… Anvil,
17 …… blade, 19 …… spring (torsion spring), 20…
… Hammer, 21 …… Cross stroke mechanism, 21c …… Eccentric shaft, 21b …… Slider, 22 …… Box rail, 23 …… Supporting roller, 24 …… Spring, 25 …… Cut strip length setting piece, 26 ......
Rib, 27 ... Spring, 27a ... Claw, a ... Resin, A
...... Supply, B ・ ・ ・ Extrusion molding machine, C ・ ・ ・ Sizing die, D ・ ・ ・ Cooling tank, E ・ ・ ・ Drawing machine, F ・ ・ ・ Sizing cutter, G ・ ・ ・ Control panel, P ・ ・ ・ Grounding down electric wire .

Claims (4)

[Claims] 1. An extrusion molding die 5 having a land 4 having a crescent-shaped or flat trapezoidal inner surface is mounted on a crosshead of an extruder B, and the center of the die 5 has an insulating core. The nipple 6 through which the wire 1 passes is arranged so that the required resin flow path 7 is formed between the peripheral dies 5,
In the nipple 6, the insulating core wire 1 and the land 4 are provided.
A device for manufacturing a grounding-down electric wire, characterized in that a pair of resin flow suppressing blades 8 having a triangular cross-section and having a gap substantially the same as the inner surface is provided symmetrically with respect to an insulating core wire. 2. The manufacturing apparatus according to claim 1, wherein a sizing die C is arranged in the vicinity of a downstream side of the extrusion molding die 5, and the sizing die C is the same as the land 4 of the die 5. An apparatus for producing a grounding-down electric wire, characterized in that a land 9 having the same transverse shape is formed on an axis and a cooling pipe 10 is additionally provided. 3. The manufacturing apparatus according to claim 2, wherein the sizing die C is provided downstream of the sizing die C.
A wire-pulling-down electric wire manufacturing apparatus comprising, in order, an electric wire P take-up machine E from the machine and a fixed-length cutting machine F into which the electric wire P from the take-up machine E is continuously fed. 4. The apparatus for manufacturing a constant length cutting machine for an electric wire for ground down according to claim 3, 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 on the frame 11 at the subsequent stage of the jig in the penetrating direction of the electric wire P. A cutting machine for cutting is provided, and in the downstream frame 11 of the electric wire penetrating direction of the cutting machine, a box-shaped rail 22 having a U-shaped cross-section with a downward or lateral opening is provided in the back direction of the box rail 22. Is located on the axis of the electric wire penetrating direction, and an electric wire retention means is provided at the opening of the box rail 22.
The cutting machine is provided with means for moving the cutter 17 in the opening direction of the box rail 22 when the electric wire penetrates the through hole of the guide jig for a required length.