JPH03214511A - Lowering wire for grounding and its manufacturing device - Google Patents

Abstract

PURPOSE:To make a casing to be laid closely along the pole surface for presenting a fine sight while making it hard to play any mischief thereon by making the crossing surface of the casing frame-shaped to form empty holes on both sides of an insulated core and providing holding ribs, which sandwich an insulated core, on the inside face of the casing of those empty holes. CONSTITUTION:A casing 2 sectionally in a crescent frame shape, or in a flat trapezoid frame shape is provided around an insulated core 1, and both sides of the insulated core 1 of this casing 2 form empty holes 3 sectionally almost in triangular shapes. The thickness of the casing 2 around these empty holes 3 is almost uniform, and holding ribs 2b are successively provided in the longitudinal direction so that they may bend the insulated core 1 between upper and lower inside faces of that casing 2. Since the empty holes 3 are formed inside the casing in this way the form the casing can be laid closely along a pole while presenting a fine sight and making it hard to play mischief.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grounding wire drawn out from various electrical devices on utility poles and an apparatus for manufacturing the same.

[Conventional technology and its issues]

As shown in Figs. 15 and 16, grounding power is supplied from various electrical devices on utility pole H! 1! P' is lowered,
The electrical @P' is covered with a hard polyvinyl chloride (PVC) earth mold M having a pipe shape or a concave cross section. In the case of a pipe, this work is performed by attaching the electric wire P' to the earth molding M.
If the cross section is concave, connect the electric wire P' to the utility pole H and attach it to the utility pole H.
(Fig. 16), and both earth molds M were fastened with steel bands, etc., and the work was complicated, and improvements were desired. For this reason, the present applicant proposed in Utility Application No. 101445/1983 that, as shown in FIG. We proposed a grounding wire P" which is provided with a protective sheath (outer covering) 2. This electric wire Pn is attached with the bottom side 2a of the cross section of the jacket 2 against the utility pole H.

However, this devised electric wAp has problems such as: 1) It requires a large amount of resin to form the protective jacket 2, and 2) It is difficult to perform terminal/connection processing after peeling off the protective jacket 2. .

In addition, it is extremely difficult to extrude the electric wire P'' (sheath) of this invention. Specifically, while the cross section of the insulated core wire 1 is circular, the cross-sectional shape of the sheath 2 is uneven. Since it has a flat trapezoidal shape or a crescent shape, the thickness of the outer sheath 2 surrounding the insulated core wire 1 is thin at the top and bottom of the insulated core!1, and becomes extremely thick on both sides.On the other hand, the wire P'' is manufactured. 14, the conventional extrusion coating of the jacket 2 onto the insulated core wire 1 is applied to the insulated core wire 1 using the crosshead (not shown) of the extruder.
A die 5 having a land 4 having a crescent-shaped or oblate trapezoid-shaped inner transverse shape is mounted on a die holder (not shown).
The two sobbles 6 are placed in the die 5 so that the required resin flow path 7 is formed between the surrounding dies 5, and the insulated core wire 1 is passed over the center line of the nipple 6. At the same time, resin a is supplied to the flow path 7.

Therefore, the difference in thickness between the upper and lower parts of the insulated core wire 1 of the outer sheath 2 and the thicknesses on both sides thereof occurs over almost the entire length of the flow path 7. In the part, the flow of resin a during outer jacket extrusion molding (inside resin flow path 7),
The degree of expansion (absolute amount) of the resin a after extrusion is extremely different, and even if the inner surface of the die land 4 is formed into the desired crescent or flat trapezoid shape, extrusion molding is not possible. In the outer sheath 2, as shown by the chain line in FIG. 13, no expansion of the resin a is observed near the insulated core wire 1;
Since the thickness of the resin is large on both sides of the insulated core wire 1, there is a problem in that the resin a in those portions released from the extrusion pressure expands and is not finished in a good shape.

In the shape shown by the chain line in FIG. 13, the bottom surface 2a does not fit exactly along the surface of the utility pole H, which is not aesthetically pleasing, and is also easily tampered with by inserting a stick into the raised gap.

Therefore, in view of the above, in the present invention, the above-mentioned outer sheath having a crescent-shaped cross section or a flat trapezoidal cross section is made to have an ideal shape after extrusion molding around the insulated core wire, and the outer sheath is It is an object of the present invention to reduce the amount of resin as much as possible, to make an insulated conductor less likely to be damaged during connection processing, and to provide an electric wire manufacturing apparatus having these advantages.

[Means to solve the problem]

In order to solve the above problems, the grounding wire according to the present invention has the following features in the wire shown in FIG.
The outer cover has a frame-shaped cross section, holes are formed on both sides of the insulated core wire, and retaining lips are provided on the inner surface of the outer cover of the holes to sandwich the insulated core wire. In the manufacturing device according to the present invention, in the above-mentioned manufacturing device for grounding wire, when the nipple is attached to the die, a pair of triangular cross-sectional shapes having substantially the same gap as the inner surface of the die land are formed. The resin flow suppression vanes are provided symmetrically with respect to the insulated core wire and in contact with the insulated core wire over its entire length, and are configured to protrude from the front of the nipple toward the downstream side from the front end of Guiland. The above-mentioned resin flow suppressing blade may be formed with a longitudinal air supply hole opening at its tip, and the supply hole may be configured to communicate with the outside air through the nipple inner hole and the nipple holder inner hole. can. The air supply hole may be an air supply groove that is opened at the tip of the surface in contact with the insulated core wire and is formed over the entire length. When forming air feed holes and air feed grooves, the resin flow suppressing blades do not necessarily need to protrude from the die land. Furthermore, an air supply jig that communicates with the inner hole of the nipple holder may be fitted to the rear end of the nipple holder, and an air supply source, dehumidification means, and constant pressure regulator may be attached to the jig. A sizing die can be placed close to the downstream side of the extrusion molding die, and the sizing die has a land having the same axis and the same cross-sectional shape as the land of the extrusion molding die, and a cooling A pipe may be attached. Furthermore, the downstream side of the sizing die can be equipped with a wire pulling machine from the sizing die and a fixed length cutting machine into which the wire from the drawing machine is continuously fed. can have the following configuration. A guide jig having a guide hole through which the electric wire from the pulling machine is fed is attached to the frame, and a cutting machine for cutting the running electric wire is provided on the frame at the latter stage of the jig in the electric wire penetration direction. , the downstream frame in the electric wire penetration direction of this cutting machine is provided with a U-shaped box rail with a downward, sideways, or sideways opening in the penetration direction, and the back surface of this box rail is aligned with the axis of the electric wire penetration direction. Along with being located above,
A wire retention means is provided at the opening of the box rail, and the cutting machine is provided with a means for moving the cutter in the direction of the opening of the box rail when the wire passes through the through hole of the guide jig to a required length. A fixed length cutting machine consisting of [Operation] In the electric wire constructed in this way, the thickness of the outer sheath can be made almost the same over the entire area due to the presence of the holes, and bulges do not occur on both sides of the insulated core wire. Also,
Cut the necessary length in the longitudinal direction from both sides of the outer covering to the hole, divide the protective outer covering into two parts through the cuts, expose the insulated conductor, and connect the exposed insulated wire to the electrical equipment on the utility pole. Perform terminal processing such as connecting to the ground wire from etc. When this cut is formed, the presence of the holes makes it less likely that the knife will reach the insulated conductor and cause scratches.

In addition, in the manufacturing apparatus, the pressure of the resin exiting the die is suppressed by the resin flow suppressing blades, and an electric wire having holes on both sides of the insulated core wire C is manufactured. At this time, when air supply holes or supply grooves are formed in the resin flow suppressing blades, air smoothly flows into the holes through the holes or grooves.

For those equipped with a sizing die, the extruded wire is shaped by the die and cooled and hardened, giving it a more ideal shape. In addition, if a pulling machine and a length cutting machine are installed, the wire from the sizing die is sent through the pulling machine to the guide jig of the length cutting machine, and then passes through the cutting machine and advances inside the box rail. When the amount of progress reaches the required length,
The cutter moves and cuts the wire. At this time, since the electric wire is pushed toward the opening of the box rail, the cutting machine side of the electric wire in the box rail moves toward the opening, creating a space on the feeding axis of the electric wire. Therefore, the next wire sent in enters that space and advances while pushing the wire in front. This action is repeated, and the electric wire that has reached the opening in the box shaft strip is discharged downward from the opening.

〔Example〕

First, let me explain about the grounding wire. An example of this is shown in FIG. 1. In the figure, 1 is an insulated core wire in which a vinyl chloride (PVC) insulation coating 1b is applied on a conductor 1a. A sheath 2 is provided in the shape of a flat trapezoidal frame, and holes 3 having a substantially triangular cross section are formed on both sides of the insulated core wire 1 of the sheath 2.
The thickness of the jacket 2 around the hole 3 is almost the same, and holding lips 2b are provided continuously in the length direction on the upper and lower inner surfaces of the jacket 2 so as to bend the insulated core wire 1. ．． The outer cover 2 is made of hard polyethylene, PVC (HDPE)
Various known materials such as This embodiment has the above configuration, and is cut in advance to a total length of about 3.3 m at a factory, for example, and
Remove the outer covering 2 from the inside of 5CI1, and then peel off about 2C11 of the insulation coating 1b of the insulated conductor 1. At the time of this peeling, if slits (cuts) 2C are made at the required length in the longitudinal direction (back and forth direction on the page) at both ends of the outer cover 2 as shown by the chain lines in Figure 2, the outer cover 2 can be split vertically. can. Therefore, the insulated conductor 1 can be removed from between the holding ribs 2b and moved laterally. In this state, the outer cover 2 is inserted into the slit 2C.
If the end of the insulated conductor 1 is cut perpendicular to the length direction, the terminal can be processed without damaging the insulated conductor 1 at all. The electrical wire P with this terminal treatment is brought to the site and connected to the grounding wire pulled down from the distribution line system at a height higher than the reach of passersby, as in the conventional method, and the connection part is insulated. After that, the electric wire P is pulled down while applying the bottom side 2a of the outer sheath cross section to the surface of the telephone pole, and is fixed by tightening with a steel band at appropriate intervals, and the lower end is connected to the ground rod. Ru.

In this embodiment, as shown in FIG. 2, an insulated core wire 1 is sent from a supply A to an extrusion molding machine B, coated with an outer sheath 2 to form an electric wire P, and the electric wire P is passed through a sizing die C and a cooling bath. D, pulling machine E, and fixed-length cutting machine F to manufacture a fixed-length grounding wire P, and the process is as follows:
Controlled by control panel G.

As shown in the third leap, the extrusion molding machine B has a die holder DH of the crosshead CH of the extrusion molding machine with an inner cross-sectional shape of a crescent shape or a flat trapezoid shape.
An extrusion molding die 31 having a land 30 having the cross-sectional shape shown in the figure is attached. This die 31 is aligned by adjusting the screwing amount of bolts f placed at equal intervals around the periphery. Inside the die 31 and the die holder DH, a nipple 32 through which the insulating core Ml passes is arranged around the nipple 32 so that a required resin flow path 33 is formed between the die 31 and the die holder DH.

This nipple 32 is screwed and fixed to the nipple holder NH, and the tip position of the nipple 32 is adjusted by adjusting the screwing amount of the port f of the nipple holder NH. Therefore, the size of the resin flow path 33 can be adjusted by moving the second bull 32 back and forth as shown by the arrow a in the figure. Take this into account and set accordingly. A pair of resin flow suppression wings 34 having a triangular cross section as shown in FIG.
The opposing surface is in contact with the insulated core wire 1 over its entire length, has a gap t that is almost the same as the inner surface of the die land 30, and its tip protrudes downstream from the front end of the land 30. The amount b of the protrusion of the suppressing blade 34 is appropriately set by experiment or the like, taking into account the temperature of the resin a, the extrusion pressure, etc. The setting is such that the resin flow suppressing blade 34 is movable in the axial direction relative to the nipple 32 by fitting etc., and only it is moved in the axial direction, or
This is done by moving the nipple 32, which is integrated with the blade 34, in its axial direction. The resin flow suppressing blade 34 is formed with a longitudinal air supply hole 3S that opens at its tip. An air supply jig 40 is attached to the rear end of the double holder NH.
The insulated core wire 1 is airtightly inserted into the nipple holder 42 and guided downstream through the nipple holder NHO inner hole 42 and the inner hole 43 of the nipple 42. The air supply jig 40 includes a constant pressure regulator 44.
, the compressor 4 via the dehumidifying air filter 45
6 is connected to the compressor 46, and air passes through the air supply jig 40, nipple holder inner hole 42, and nipple inner hole 43 as shown by the arrow from this compressor 46 to the air supply hole 39.
The air is fed into the pores 3 of the jacket 2.

On the downstream side of the extrusion molding die 31, a sizing die C is arranged close to it. This die C has a land 36 coaxial and of the same cross-sectional shape as the land 30 of the die 31, and is also provided with a cooling pipe 37. Water at an appropriate temperature flows through the cooling pipe 37.
Dice C is cooled by this hot water. In addition, the land 36 contains a tetrafluorinated ethylene polymer (for example,
It is coated with DuPont (trade name: Teflon) 38, and this coating layer allows the wire P to move smoothly after extrusion. This extrusion molding machine B has the above-mentioned configuration, and as shown in FIG. Resin a on path 33
When the insulated core wire 1 is supplied with the outer sheath 2 having a shape that crosses the inner surface of the land 30, as in a general extrusion molding machine. At this time, the resin flow suppressing blade 34 suppresses the pressure of the resin a that has exited the die 31, and furthermore, the resin a (sheath 2) that has exited the die 31 has air fed into it from the feed hole 39. At the same time, the wire is cooled and hardened while being shaped with a sizing die C to obtain an electric wire P having a desired cross-sectional shape having holes 3 on both sides of an insulated core wire 1 as shown in FIG. The extrusion molding machine B shown in FIGS. 5 and 6 is different from the extrusion molding machine B shown in FIGS. This is a groove that opens, and air is sent into the hole 3 through this air supply groove 39, but the same operation as described above causes the first
The electric wire P shown in the figure is manufactured.

The extrusion molding machine B shown in FIGS. 7 and 8 has an air supply hole 3S.
, the air supply groove 39 is not formed, and in this case, the nipple 3 passes through the inner hole 43 of the nipple 32.
Air will be supplied to the hole 3 from the tip of the hole 2. At this time, if the outer sheath 2 with the desired cross-sectional shape can be obtained without the resin flow suppressing blades 34 reaching the sizing die C, the ninth
As shown in the figure, the length (protrusion amount b) of the suppression blade 23 may be short. Resin flow suppression blade 34 shown in FIGS. 3 and 5 above
The same applies to

The electric wire P formed by the extrusion molding IIB and the sizing die C in the above manner is passed through the cooling tank D and taken off by the take-off machine E. That is, this take-off IRE has a well-known structure, and as described above, by this take-off action, the insulated core wire 1 is fed from the sub-line A onto the central axis of the nipple 32 of the extrusion molding machine B, and the above-mentioned extrusion molding is carried out. will be done. The electric wire P taken off by the take-off machine is sent to a fixed length cutting machine F downstream. This fixed length cutting machine F is the 10th
As shown in the figure, a rectangular box column 12 with an open outlet/entrance for the electric wire P is provided at one end of the machine base (equipment frame) 11, and a cutting box 13 is mounted on the base 12b of the inner surface of the open part 12a of the rectangular box column 12. It is provided so as to be slidable back and forth with respect to the course of the electric wire P (in the direction of the arrow).

A blade receiver 15 serving as a guide jig for receiving the t-wire P is fitted into the cutting box 13 on the upstream side of the path of the electric wire P so that the blade receiver 15 can be adjusted forward and backward by a clearance adjustment hole 18. still,
18a is a washer, 18b is a lock nut, and after adjusting the clearance between the blade 17 and the blade receiver 15, which will be described later, the blade receiver 15 is fixed with the lock nut 18b.

A square hole 13a is formed in the vertical direction of the center of the cutting box 13 to receive the blade support rod 14 in a slidable manner.

The blade support rod 14 has a shape shown in FIG. 12, and is fitted from the lower part of the square hole 13a, so that the lower protrusion 14a hits the lower surface of the cutting box 13 to prevent it from passing through.

When the blade support rod 14 is inserted into the cutting box 13, the bottle 19a is inserted into the hole 14b of the blade support rod 14, and the pin 19a is inserted into the hole 14b of the blade support rod 14.
A torsion spring 19 is interposed between both protruding ends of the cutting box 13 and the upper surface of the cutting box 13, and the blade support rod 14 is pulled up. A dovetail groove 14c is provided on the surface of the blade support rod 14 facing the blade receiver 15.
A blade 17 with a dovetailed outer shape is fitted therein.

Note that 16 is an anvil.

On the downstream side of the cutting box 13, wire guide box rails 22 (hereinafter referred to as box rails) with a U-shaped cross section are installed in series, and the wires P are guided into the box rails 22 at appropriate intervals in the length direction. A spring 27 for retention is installed so as to sandwich the opening of the box rail 22. As shown in FIG. 11(a), one end of the inner surface of this mountain rail 22 (the side of the blade receiver 15 on the right side of FIG. 10) is located at a distance r of the thickness of the electric wire P (see FIG. 1) from the back surface. A rib 26 is provided, and this rib 26 prevents the electric wire P from returning upward when the electric wire P is lowered by the blade 17, which will be described later. Further, a cutting length setting piece 25 is provided on the other end side of the box rail 22 so as to be movable and fixed in the length direction.
This setting piece 25 is screwed at a required position, and when the electric wire P is fed into the box rail 22 and its tip hits the setting piece 25, the box rail 22 and the cutting box 13 move as the electric wire MP advances. Note that 23 in the figure is a support roller for the box rail 22.

A cross stroke mechanism 21 is provided at the top of the square box column 12, and the hammer 20 is constantly reciprocated up and down by this mechanism 21. In the cross-stroke mechanism 21, an eccentric shaft 21c fixed to an axial center shaft 21a of a constantly rotating flywheel W is fitted into a hole in a slider 21b in the block 20a of the hammer 20, and the rotation of the eccentric shaft 21C As a result, the slider 21b moves horizontally and vertically as shown by the chain line in FIG.
That is, the hammer 20 is pushed down. Therefore, when the upper surface of the anvil 16 faces the lower side of the hammer 20 (as indicated by the chain line Di in FIG. 10), the upper surface is struck by the hammer 20, and the anvil 16, namely the blade support rod 14, descends. Electric wire P is cut.

This fixed-length cutting machine F has the above-described configuration, and when starting work, first, as shown in FIG. This prevents the wire from being bent when the tip of the wire P to be fed next hits the cutting length setting piece 25.

From this state, the electric wire P is now transferred from the pulling machine E to the blade receiver 15.
When the electric wire P enters the box rail 22 and hits the cutting length setting piece 25, the wire P moves against the spring 24 through the setting piece 25 to move the box rail 22 and the cutting box 13 to the first position.
Move figure 0 to the left. This movement is performed without bending the electric wire P because the outer sheath 2 is made of a hard resin. When the amount of movement is a certain amount, for example, the length of the feed from the blade 17 is 3.3 m, the anvil 1 is moved as shown by the chain line in the figure.
6 is located below the hammer 20 and is struck, and the blade support rod 1
4 is lowered, and the electric wire P is cut into a regular length by the blade 17 and the blade receiver 15.

During this cutting, the blade 17 pushes the electric wire P downward, so the 14th
As shown in figure (a), the cutting box 13 for the electric wire P in the box rail 22
The side is lowered and this state is maintained by the rib 26, and a space S is created at the feeding level of the electric wire P. Therefore, after cutting, the spring 24 holds the box rail 22 and the cut box 1.
3 returns to its original position, and as it does so, the next electric wire P enters the space S (as shown by the chain line in FIG. 11(a)) and advances while pushing down the electric wire P in front. When this action is repeated, the electric wire P facing the lower opening of the box rail 22 is exposed to the claw 2 of the spring 27 from the opening. A is pushed open and the pieces are discharged one after another into the machine stand 11 (dashed line B in Fig. 11).

In this fixed length cutting machine F, the cross stroke mechanism 21
Instead of an air cylinder,! A reciprocating drive machine such as a magnetic plunger can be employed.

Further, when the electric wire P is extruded with its long sides vertical (up and down), the length cutting machine F is set horizontally, the cross stroke mechanism 21 is set horizontally, and the opening of the box rail 22 is set horizontally.

〔Effect of the invention〕

Since the grounding wire according to the present invention is constructed as described above and has holes formed in the outer sheath, its shape can be made to closely follow the utility pole, and therefore it is aesthetically pleasing. Good《, not likely to be pranked. Furthermore, since there are pores, there is an effect of saving resin for the outer covering, and there is also the advantage that terminal treatment is easy.

Moreover, the manufacturing apparatus according to the present invention has the advantage of being able to manufacture electric wires having such preferable shapes smoothly and without deformation.

Furthermore, if a pulling machine and a fixed-length cutting machine are installed, the wire can be cut to a fixed length.In this case, if the fixed-length cutting machine has a box rail, etc., the wire can be cut within the box rail. This means that the wires that have been removed are supported and removed as appropriate, eliminating the need for people to be constantly present and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the grounding wire according to the present invention, FIG. 2 is a schematic diagram of an embodiment of the manufacturing apparatus of the same embodiment, and FIG. 3 is the extrusion molding machine of FIG. 2. 4(a) is a perspective view of the nipple in FIG. 3, FIG. 4(b) is a left side view of the resin flow suppressing blade in the same figure, FIGS. 5, 7, and 9. The figures are schematic sectional views of other examples of the extrusion molding machine shown in Fig. 2, and Fig. 6 (
a) is a perspective view of the nipple in Fig. 5, the same figure @) is a left side view of the resin flow suppressing blade in the same figure, Fig. 8 is a perspective view of the nipple in Fig. 7, and Fig. 10 is a perspective view of the nipple in Fig. 2. FIG. 11 is a cutaway front view of the main part of the standard length cutting machine, and FIG. 11 is a cutaway right side view of FIG.
) is the AA section, FIG. 12 is a perspective view of the blade support rod and blade in FIG. 10, FIG. 13 is a cross-sectional view of the conventional grounding wire, and FIG. The figure is a cross-sectional view of a main part of a conventional example of an extrusion molding machine, FIG. 15 is an explanatory view of the attachment of a grounding wire to a utility pole, and FIG. 16 is a cross-sectional view taken along line X-X in FIG. 15. P: Grounding cable, M: Earth mall, H: Telephone pole, A
......Sublay, B...Extrusion machine, C...Sizing die, D...Cooling tank, E...Take-off machine,
F: Fixed length cutting machine, G: Control panel,
CH...Crosshead, DH...Dice holder NH...Nipple halter 1...Insulated core wire, 1a...Conductor,
1b...Insulating coating, 2...Outer covering, 2
b...Retaining rib, 3...Vacancy, 4...
... Dice land, 5 ... Dice, 6.
... Nipple, 11 ... Frame, 12 ... Square box column, 13 ... Cutting box, 14 ... Blade support rod, 15. ...Blade holder, 16...Anvil, 17...
・Blade, 18...Adjusting nut, 19...Toshin spring, 20...
... Hammer 21 ... Cross stroke mechanism, 22 ...
... Box rail, 24 ... Spring, 25
..... Cutting length setting piece, 26 ..... Rib, 27 ..... Spring, 27a ..... Pawl, 30 .....
・Dice land, 31... Dice, 32
... Nipple, 33 ... Resin flow path,
34...Resin flow suppression blade, 36...Sizing die land, 37...Cooling pipe, 3
8...Courty 39...Air 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. ng,

Claims (9)

[Claims] (1) In a grounding wire P which is provided with a synthetic resin sheath 2 on an insulated core wire 1 and is arranged along the length direction of the surface of a utility pole H, the cross section of the sheath 2 is The insulated core wire 1 has a crescent frame shape or a flat trapezoid frame shape, and has holes 3 on both sides of the insulated core wire 1, and has a bottom side 2a of its cross section in an arc shape along a circumferential arc of the cross section of the electrode H; A grounding/lowering electric wire characterized in that holding ribs 2b are provided on the inner surface of the outer sheath 2 in the casing 3 to sandwich the insulated core wire 1. (2) Attach an extrusion molding die 31 having a land 30 with a crescent-shaped or flat trapezoid-shaped inner surface transverse shape to the crosshead CH of the extrusion molding machine B, and place the insulated core wire in the center inside the die 31. A nipple 32 through which 1 passes through is arranged so that a required resin flow path 33 is formed between the surrounding dies 31, and the nipple 32 is provided with the die land 3.
A pair of resin flow suppressing blades 34 having a triangular cross section and having a gap t that is almost the same as the inner surface of the insulating core are provided symmetrically with respect to the insulated core wire 1. The die land 30 is connected to the line 1 from the front surface of the nipple 32.
A manufacturing device for a grounding wire, characterized in that the wire protrudes downstream from the front end. (3) Attach an extrusion molding die 31 having a land 30 with a crescent-shaped or flat trapezoid-shaped inner surface transverse shape to the crosshead CH of the extrusion molding machine B, and place the insulated core wire in the center inside the die 31. A nipple 32 through which 1 passes through is arranged so that a required resin flow path 33 is formed between the surrounding dies 31, and the nipple 32 is provided with the die land 3.
A pair of resin flow suppressing blades 34 having a triangular cross section and having a gap t that is almost the same as the inner surface of the resin flow are provided symmetrically with respect to the insulated core wire 1 and in contact with the insulated core wire 1 over its entire length. A longitudinal air supply hole 39 is formed in the flow suppressing blade 34 at its tip, and this air supply hole 39 is communicated with the outside air through the nipple inner hole 43 and the nipple holder inner hole 42. Features: A manufacturing device for grounding cables. (4) The apparatus for producing an electric wire for grounding and pulling down according to claim (3), characterized in that resin flow suppressing wings 34 protrude from the front surface of the nipple 32 to the downstream side from the front end of the die land 30. Electric wire manufacturing equipment. (5) In the apparatus for manufacturing a grounding wire according to any one of claims (2) to (4), an air supply jig 40 that communicates with the inner hole 42 is attached to the rear end of the nipple holder NH. This jig 40 is equipped with an air supply source 46 and a dehumidifying means 4.
5 and a constant pressure regulator 44. (6) In the apparatus for manufacturing a grounding wire according to any one of claims (2) to (5), a sizing die C is disposed adjacent to the downstream side of the extrusion molding die 31; The sizing die C has a land 36 having the same axis and the same cross-sectional shape as the land 30 of the die 31, and a cooling pipe 37 is attached to the sizing die C. (7) The apparatus for manufacturing a grounding wire as claimed in claim (6), wherein the resin flow suppressing blade 34 extends into the land 36 of the sizing die C. (8) In the manufacturing apparatus according to claim (6) or (7), on the downstream side of the sizing die C, there is an electric wire pulling machine E from the sizing die C, and an electric wire P from the pulling machine E.
A manufacturing device for a grounding wire, which is equipped with a fixed length cutting machine F in which wires are continuously fed. (9) The apparatus for manufacturing a fixed length cutting machine for grounding wires according to claim (8), wherein the fixed length cutting machine F has the following configuration. A guide jig having a guide hole through which the electric wire P from the above-mentioned pulling machine E is fed is attached to the frame 11, and the running electric wire P is cut on the frame 11 at the latter stage of the electric wire passing direction of this jig. A cutting machine is provided, and the downstream frame 11 in the electrical wire penetration direction of this cutting machine is provided with a U-shaped box rail 22 in the penetration direction with a downward or sideways opening in cross section,
The back surface of this box rail 22 is located on the axis in the electric wire penetration direction, and the opening of the box rail 22 is provided with a retention means for the electric wire, and the cutting machine is provided with a through hole of the guide jig. When the wire passes through the required length, the cutter 17 is cut into the box rail 22.
A fixed length cutting machine comprising means for moving in the opening direction of the cutter.