JPH1040756A - Manufacture of electric wire provided with rotation fin in continuously extruding cross-linking apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent high temperature steam and a high temperature and high pressure gas from leaking out of an interface of a rotation part by manufacturing an electric wire provided with a rotation fin while sealing the interface between mutually rotating a rotation die having a fin forming groove and a head of an extruding apparatus by pouring a lubrication material to the interface. SOLUTION: In manufacturing electric wires provided with a rotation fin, a lubrication material pouring route 91 is formed in a plug 9 for coming out prevention and the outlet of the route 91 is set to be a tip end face for screwing the plug itself and opened toward the interface between a head 2 of an extruding apparatus and a rotation die 3 having a fin forming groove where both of the head 2 and the die 3 are relatively rotated. A lubrication material 23 is poured into the interface between the head 2 of an extruding apparatus and the rotation die 3 having a fin forming groove where both of the head 2 and the die 3 are relatively rotated by continuously pouring the lubrication material 23 into the route 91 and the interface of the relatively rotating parts where a gap is easily formed is constantly sealed. Consequently, in the case a cross-linking work is carried out, high pressure steam in a crosslinking cylinder 8 can be prevented from leaking out of the interface through a communication cylinder 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a wire with a rotating fin in a continuous extrusion crosslinking apparatus.

[0002]

2. Description of the Related Art In an overhead distribution line, a spiral fin is provided on the surface of an insulating coating provided on a conductor for the purpose of preventing a noise caused by the wind and a disconnection which may occur due to snow. A so-called electric wire with a rotating fin is provided.

[0003] The method of manufacturing the above-mentioned electric wire with rotating fins is disclosed in, for example, Japanese Patent Publication No. 56-8865 and Japanese Patent Publication No.
No. 31,766, that is, a die having a fin forming groove is rotatably loaded into an extruder head,
There is a method in which this is rotationally driven by an external rotary drive mechanism, and a spiral fin is continuously applied to the surface of the extruded insulating coating together with the extrusion.

[0004] In these production methods, a rotary die having a fin forming groove is attached to a head portion of a generally used extruder, and a spiral fin is simply provided on a sheath.

On the other hand, Japanese Utility Model Laid-Open Publication No. 50-140985 and Japanese Patent Laid-Open Publication No. 55-69911 describe examples in which a lubricant (specifically, oil) is used in a head portion of an extruder. However, the purpose of use of the lubricant in these methods is to supply the lubricant between the rotating die and the entire outer peripheral surface of the extruded coating having the extruded concave or convex helical fin, so that the extrusion is performed. This is to prevent appearance defects such as roughened skin of the insulating cover.

[0006]

At present, a cross-linking cylinder is connected to an extrusion head on an extrusion line equipped with a device for extruding a general sheath or insulator as described above, and an insulating coating extruded by the extrusion head. Is immediately cross-linked in the cross-linking cylinder by high-pressure steam or high-temperature and high-pressure gas, and is cooled by cooling water in the middle of the cross-linking cylinder. A so-called continuous extrusion cross-linking device is used. The inventors studied a method of manufacturing an electric wire. In this case, a rotary die with a fin forming groove was attached to the extrusion head portion, and the driving force from the outside was used to provide the rotary electric wire with a fin.

However, when a wire with a rotating fin is manufactured by the continuous extrusion crosslinking apparatus as described above, since there are rotating parts and parts that do not rotate, the high-pressure steam in the bridging cylinder starts from the interface between the relative rotating parts. And the phenomenon that high-temperature and high-pressure gas leaks occurred, and it could not be put to practical use as it was.

Therefore, the problems to be solved by the present invention (objects)
When manufacturing electric wires with rotating fins by using a continuous extrusion and cross-linking device in which an extruder head and a cross-linking cylinder are provided on a common production line, high-temperature steam or high-temperature high- It is an object of the present invention to provide a method of manufacturing a wire with a rotating fin in a continuous extrusion crosslinking apparatus, which is devised not to leak from an interface.

[0009]

Means for Solving the Problems A method for producing a wire with a rotating fin in a continuous extrusion crosslinking apparatus provided by the present invention comprises:
A rotatable driving cylinder is provided in a part of the connecting cylinder that connects the extruder head rotatably loaded with the fin forming grooved rotary die and the bridging cylinder, and this driving cylinder is linked to the fin forming grooved rotary die, By rotating the drive cylinder, to form a spiral fin on the insulating coating that is extrusion-coated on the conductor, in the method of manufacturing a wire with a rotary fin in a continuous extrusion cross-linking device, the rotary die with a fin forming groove and It comprises a method in which a lubricant is poured into an interface which rotates relative to the extruder head, and the interface is sealed to provide an electric wire with rotary fins.

As the above lubricant, a water-soluble lubricant is preferably used. The lubricant is preferably injected from the passage of the retaining plug of the rotary die having the fin forming groove.

[0011]

1 to 4 show an embodiment of the present invention. FIG. 1 shows a method of manufacturing a wire with a rotating fin in a continuous extrusion bridging apparatus together with surface printing, and FIG. Fig. 3 (a) and (b) show the rotary die mounting part with fin forming groove, the drive cylinder, and the printing roll of the continuous extrusion cross-linking device. FIG. 4 shows the disassembled state of the print roll unit.

The extruder head denoted by reference numeral 2 has a rotary die 3 having a fin forming groove at a position where the conductor 1 is passed.
The one end of the drive cylinder 5 is linked to the extruding side of the fin forming grooved rotary die 3 in such a manner that the one end of the drive cylinder 5 is hooked in the rotational direction by the concave and convex engagement in the circumferential direction. A connecting cylinder 6 is linked to the other end via a bearing 7, and a bridging cylinder 8 is linked to the connecting cylinder 6.

Reference numeral 71 denotes a packing, which is tightly interposed between the bearings 7 and 7 to prevent steam and gas from leaking from the bridge cylinder 8 side. Reference numeral 9 denotes a plug for retaining the screw, which is screwed from the extrusion side of the extruder head 2 to hold down the rotary die 3 having a fin forming groove. Reference numeral 51 denotes a packing, which is tightly fitted between the driving cylinder 5 and the retaining plug 9 to prevent leakage of steam or gas from the bridging cylinder 8 side.

Reference numeral 10 denotes a bolt and nut for tightening the flanges of the extruder head 2 and the connecting cylinder 6 so as to securely maintain a state in which the driving cylinder 5 is linked to the rotary die 2 having a fin forming groove.

A gear 5a is provided on the outer periphery of the drive cylinder 5, and a roller chain 12 is wound around the gear 5a of an external rotary drive device 11 such as a motor. The die 3 is driven to rotate.

In the continuous extrusion bridging apparatus for producing finned electric wires having the above-described configuration, the conductor 1 is supplied into the extruder head 2 and passed through the fin forming grooved rotary die 3, and the fins are formed. The resin supplied into the extruder head 3 is extruded from the rotary die 3 with the fin forming groove while the rotary die 3 with the forming groove is rotationally driven, so that the conductor 1
Rotating fins 21 on the surface of insulating coating with insulating coating on top
Is spirally extruded, and the electric wire 21 with rotary fins is continuously manufactured.

In the manufacture of the electric wire with a rotary fin, in this embodiment, a lubricating material injection passage 91 is formed in the retaining plug 9 and the outlet of the passage 91 is used as a screw-in tip surface of the plug itself. The opening is made toward the interface where the machine head 2 and the fin forming grooved rotary die 3 rotate relative to each other.

Then, from the beginning of the production of the electric wire with rotary fins, the lubricant 23 is continuously injected into the passage 91 so that the interface between the rotary die 3 with the fin forming groove and the extruder head 2 relatively rotates. A method is adopted in which the lubricating material 23 is poured and the interface at the relative rotating portion where a gap is likely to occur is constantly sealed. When the electric wire 21 with the rotating fins having been subjected to the above-described extrusion operation is subjected to a cross-linking operation in an atmosphere of high-pressure steam in the cross-linking tube 8 while constantly sealing the interface where such a gap is likely to be formed, It is possible to prevent the high-pressure steam inside from leaking from the interface through the connecting cylinder 5.

Further, in addition to the interface of the relative rotating portion, the lubricant 23 flows into the interface between the retaining plug 9 and the driving cylinder, where the lubricating member 23 rotates relative to each other. If it flows into the interface between the stopper plug 9 and the connecting cylinder 5 and the interface is always sealed at any of those interfaces, steam leakage can be completely prevented. However, since the interface at the portion that does not involve relative rotation can be reliably sealed with packing or the like, in that case, the lubricant does not need to be poured.

The lubricating material 23 may be a lubricating oil,
Water-soluble lubricants are preferred. The reason is that when lubricating oil is used for the lubricant 23, it flows down the interface between the fin forming grooved rotary die 3 and the driving cylinder 5 and drips into the bridge cylinder 8, which adversely affects the manufactured product. Oil may be removed from the inside of the cross-linking cylinder 8 in order to prevent this. Since the water-soluble lubricant becomes water-soluble, there is no problem even if it is mixed with the cooling water in the cross-linking cylinder 8, and the oil removing operation as described above is not required. It can also be used as water. The use of "UNILUBE" (a product mainly composed of polyethylene recall) manufactured by NOF Corporation as this water-soluble lubricant is effective in clearing all of the above points.

In the above-described embodiment, the case where steam is used in the cross-linking cylinder is shown. However, even when a high-temperature and high-pressure gas such as N ₂ gas is used, a gas leakage seal can be formed with a similar lubricant. It is possible to

In the above-described embodiment, the lubricant injection passage 91 is provided in the plug for retaining and opens only in the vicinity of the rotary die 7 having the fin forming groove.
A lubricant injection passage is also provided at the interface between the connecting cylinder 6 and the connecting cylinder 6 and the interface between the connecting cylinder 6 and the bridging cylinder 8, and the lubricant is positively poured into the interface to form a more complete seal. As a result, it is possible to contribute to further stable production of the electric wire with a rotating fin.

As shown in FIG. 1, in the above embodiment,
It also has a printing mechanism. That is, as shown in FIG. 3 and FIG. 4, a pair of parallel arms 15 and 15 are
The print rolls 17 with built-in bearings are pivotally supported by smooth linear shafts 18 at the protruding ends of the arms 15 respectively. Then, a tension spring 19 is stretched between the linear shafts 18, 18, thereby forming a pair of printing rolls 1.
The springs 7 and 17 are biased toward each other in a direction facing each other. The print roll 17 is engraved with print characters and the like on its own roll surface.

The cassette type printer 13 having the above configuration is loaded into the end of the drive cylinder 5 near the extruder head 2 side, and has a flange 5b having a common frame 14 in the drive cylinder 5. And a holding bolt 20 as shown in FIG.
Is screwed into the screw hole 5c of the flange 5b through the common frame 14, whereby the cassette type printer 13 is assembled. By operating the holding bolt 20, the cassette printer 13 including the print roll 17 is operated.
It can be replaced by itself. As a result of assembling the cassette type printer 13 as described above, the printing roll 17 is arranged close to the extrusion port of the rotary die 3 with fin forming grooves without any gap.

In the above configuration, when the conductor 1 to be insulated is passed through the extruder head 2 and is insulated through the rotary die 3 having the fin forming groove, the drive cylinder is driven by the operation of the external rotary drive device 11. By rotating 5, the cassette type printer 13 is rotated in synchronization with the rotary die 3 having the fin forming groove. Therefore, when the predetermined electric wire 21 is continuously manufactured, the printing roll 17 is opposed to a position perpendicular to the fin forming groove of the fin forming grooved rotary die 3 so as to be extruded as having a rotating finned coating. The printing 22 is continuously performed in parallel with the rotating fin 21a at a position perpendicular to the rotating fin 21a with respect to the surface immediately after the extrusion of the wire 21 with the rotating fin, so that it is possible to print clearly at a constant density.

In the above printing, since the printing roll 17 is close to the rotating die 3 having the fin forming groove, the lubricant flowing from the interface between the rotating die 3 having the fin forming groove and the connecting cylinder 5 is used for the printing 7. Since it adheres to the surface, even if the compound residue at the time of extrusion adheres to the printing roll, the effect of removing the same can be obtained, which contributes to the prevention of damage to the electric wire 21 with rotating fins.

[0027]

According to the present invention as described above, when an electric wire with rotary fins is manufactured by a continuous extrusion cross-linking apparatus in which an extruder head and a cross-linking cylinder are provided on a common manufacturing line,
Expected problem of providing a method for manufacturing a wire with a rotating fin in a continuous extrusion crosslinking device, which is devised so that high-temperature steam or high-temperature high-pressure gas on the cross-linking tube side does not leak from the interface of the rotating portion where gaps are likely to occur. Can be achieved, and its industrial value is great.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing a method for manufacturing a wire with a rotating fin in a continuous extrusion crosslinking apparatus together with surface printing according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a main part of the continuous extrusion crosslinking apparatus shown in FIG. 1; a rotary die mounting part having a fin forming groove and a rotation driving mechanism thereof.

FIG. 3 (a) is a main part of the continuous extrusion crosslinking apparatus shown in FIG. 1;
FIG. 3 is an explanatory cross-sectional view showing, in an enlarged manner, a rotary die mounting portion with a fin forming groove, a driving cylinder, and a printing roll, and FIG.

FIG. 4 is an exploded explanatory view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductor 2 Extruder head 3 Rotary die with fin forming groove 4 Bearing 5 Drive cylinder 5a Gear 5b Flange 5c Screw hole 6 Connection cylinder 7 Bearing 8 Bridge cylinder 9 Plug 10 Bolt nut 11 External drive device 11a Gear 12 Roller chain 13 Cassette type Printer 14 Common frame 15 Parallel arm 16 Pin 17 Printing roll 18 Linear shaft 19 Tension spring 20 Holding bolt 21 Electric wire with rotating fin 21a Rotating fin 22 Printing 23 Lubricant 51 Packing 71 Packing 91 Lubricant injection passage

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[Procedure amendment]

[Submission date] August 9, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

The lubricating material 23 may be a lubricating oil,
Water-soluble lubricants are preferred. The reason is that when lubricating oil is used for the lubricant 23, it flows down the interface between the fin forming grooved rotary die 3 and the driving cylinder 5 and drips into the bridge cylinder 8, which adversely affects the manufactured product. Oil may be removed from the inside of the cross-linking cylinder 8 in order to prevent this. Since the water-soluble lubricant becomes water-soluble, there is no problem even if it is mixed with the cooling water in the cross-linking cylinder 8, and the oil removing operation as described above is not required. It can also be used as water. This water-soluble lubricant, the use of NOF Corporation Product "Unilube" (composed mainly of polyethylene grayed recall), is effective can all clear the above points.

Claims (3)

[Claims] 1. A rotatable drive cylinder is provided at a part of a connecting cylinder that connects an extruder head rotatably loaded with a rotary die having a fin forming groove and a rotary cylinder having a fin forming groove. Forming a spiral fin on an insulating coating that is extrusion-coated on a conductor by linking to a die and rotating a driving cylinder thereof; A method for producing a wire with rotary fins in a continuous extrusion cross-linking apparatus, wherein a lubricant is poured into an interface between a grooved rotary die and an extruder head that rotates relative to each other, and the interface is sealed to provide the wire with rotary fins. 2. A method for producing an electric wire with a rotating fin in a continuous extrusion crosslinking apparatus, wherein a water-soluble lubricant is used as the lubricant. 3. The method for manufacturing a wire with a rotating fin in a continuous extrusion cross-linking device according to claim 1, wherein the lubricant is injected from a passage of a retaining plug of the rotating die having a fin forming groove.