JPH0757573A - Extruding method and device for outdoor cross-linking polyethylene insulated electric wire with rotary fin - Google Patents

Abstract

PURPOSE:To provide the extruding method and device for a rotary emboss printed electric wire with rotary fins for preventing the snow accretion of an OC cable. CONSTITUTION:An emboss printing device is arranged between a cross head 1 and a splice box 9 to be driven while being connected or disconnected, and a rotary die is concurrently driven by the rotary driving force of the emboss printing device for manufacturing. In a head for an extruding machine provided with the rotary die, the splice box 9 and the emboss printing device provided between the cross head 1 and the splice box 9 can be moved in parallel by a guide rod 71 fixed to the cross head 1. Both sides of the printer casing 10 of the emboss printing device are made airtightly couplable with the cross head 1 and the splice box 9 respectively, and the rotary die is driven by the rotary drive system of the emboss printing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing an outdoor cross-linked polyethylene insulated electric wire (OC cable) with a rotary fin for difficult snow accretion and an electric wire with rotary embossing printing.

[0002]

2. Description of the Related Art A conventional example of a rotary head for an extruder for rotary embossing printing on a rotary fin for snow-covering of a conventional outdoor cross-linked polyethylene insulated wire (OC cable) with a rotary fin will be described with reference to the drawings. explain. FIG. 4 is a cross-sectional view of the main parts showing the configuration of the rotary head for an extruder. That is, the coating resin 2, which is supplied from the cross head 1 and forms the rotary fin for difficult snow accretion, is coated around the insulating core wire 3 which is inserted through the center of the die 4 which is rotatably supported by the bearing 5. Between the cross head 1 and the splice box 9, a printer casing 10 having a right end supported by a bearing 5 ′ so as to be rotatable by a drive motor 8 via a chain 11 is fixed by a connecting rod 7. Printer casing 1
The embossing roll 6 in 0 rotates on its axis by the movement of the cable, but revolves by the rotation of the printer casing 10. The printer casing 10 is also rotatably connected to the die 4 in the crosshead 1. The die outlet shape is twisted and rotated, and the rotary fin for snow-driving is covered around the insulating core wire 3. , Is formed to print on this.

That is, the coating resin 2 is spirally extrusion-coated on the insulating core wire 3 by the rotating die 4, and the coated fin is spirally emboss-printed by the rotating embossing roll 6. is there. Then, the nitrogen gas and steam in the splice box 9 for cross-linking the same is sent to the right side while cross-linking, and is delivered as a product.

[0004]

By the way, unlike a general plastic insulated wire, a crosslinked polyethylene wire needs to be pressurized and heated by a pressure vessel having a closed structure such as a bridge. Therefore, the pressure vessel is adapted to enter the pressure vessel immediately after being extruded. Therefore, an OC cable that is embossed on a spiral rotating fin must be rotated and further embossed in the pressure vessel before crosslinking.

However, the crosshead 1 for extrusion molding and the fins were rotationally driven, and the device for embossing printing was attached. The kneading condition of the coating resin 2 immediately after extrusion, the degree of uneven thickness, and the appearance of the coating were confirmed. After that, it was sandwiched by the right splice box 9 and fixed to the flange portion of the crosshead 1 by the connecting rod 7.

According to such a method, the coating state of the coating resin 2 on the crosshead 1 can be confirmed before mounting the embossing printing apparatus as described above, but regarding the fin rotation degree and the result of the embossing printing state. I had to wait for the cable coming out of the water seal and the outlet of the pressure vessel a hundred and a dozen meters away, and it was impossible to make adjustments when there was a problem, so I had to re-work from the beginning. Furthermore, since the drive system of the embossing printing device had to be mounted after mounting the printing device between the crosshead 1 and the splice box 9, it took time to perform the work, and the insulating core wire 3 extruded during that time was pressed, It could not be heated and was turned into scraps.

The present invention has been made in view of the above point, and it is possible to solve the above-mentioned drawbacks of the prior art and to greatly improve the installation work time. Moreover, the rotary fin and the embossed printing state can be visually observed. It is an object of the present invention to provide a novel method for producing an outdoor cross-linked polyethylene insulated wire with a rotating fin, which can be adjusted while confirming the above, and an apparatus therefor.

[0008]

SUMMARY OF THE INVENTION The present invention provides an extrusion manufacturing method in which an extruder equipped with a rotating head on an insulating core wire is used to extrusion-cover a rotary fin for difficult snow adhesion, and printing is performed on the rotary fin with an embossing printing device. An embossing printing device is disposed between the crosshead and the splice box so that it can be driven with and without connection, and the rotary die is driven together by the rotational driving force of the embossing printing device to manufacture. It is an extrusion manufacturing method of an outdoor cross-linked polyethylene insulated wire. In addition, in an extruder head having a rotary die including a resin coating molding cross head portion, a die rotation drive head device, an embossing printing device, and a splice box, an embossing printing device and a splicing device provided between the cross head and the splicing box. The box and the embossing printer are configured so that they can be moved in parallel, and both sides of the printer casing of the embossing printer are formed so as to be able to tightly engage the crosshead and the splice box, respectively, and rotated by the rotary drive system of the embossing printer. It is an extruder head equipped with a rotary die characterized in that the die is driven. For an extruder equipped with a rotary die, the embossing printing device provided between the crosshead and the splice box can be operated independently without being connected to the die rotation driving head device, and adjustment is facilitated. The head.

[0009]

The gist of the present invention is to enable the embossed printing device with rotary drive to be slidably mounted on both the crosshead and the splice box by one-touch operation, to have airtightness as a pressure container, and also to rotationally drive the die inside the crosshead. The purpose is to have a structure capable of transmitting force, which shortens the setup time of the manufacturing apparatus and improves waste reduction.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a rotary head for an extruder provided with an embossed printer with rotary fins. The same members described in the above conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted. That is, the die 4 is rotatably supported by the bearing 5 on the crosshead 1. This crosshead 1 and the right splice box 9
The printer casing 10 in which the embossing roll 6 is incorporated is rotatably supported by the support frame 72 slidably supported by the plurality of guide rods 71 through the bearing 5 ′, The rotational driving force is rotated via the chain 11. The left end of the printer casing 10 is connectable to the die 4 and the printer casing 10 so that the rotational driving force is also transmitted to the rotatably supported die 4 in the crosshead 1. The support frame 72 and the splice box 9 of the printer casing 10 are supported by a plurality of guide rods 71 mounted on bearings provided on the flange portion of the crosshead 1, and the printer casing 10 has a left side cloth. The splice box 9 on the right side is formed so as to be movable and connectable to both the head 1 and the splice box 9 on the right side.
The air-tight construction is such that the nitrogen gas and the steam 20 in the splice box are connected to each other via a seal 12 so as not to leak.

Next, a method of manufacturing a polyethylene insulated electric wire with a rotary fin printed by a rotary head for an extruder equipped with the rotary die configured as described above will be described. First,
As shown in FIG. 2, the support frame 72 and the splice box 9 of the printer casing 10 are slid to the right along the guide rod 71 and away from the crosshead 1 to open the space between the crosshead 1 and the printer casing 10. Then, first, the state of the coating resin coated on the outer periphery of the insulating core wire 3 is confirmed and adjusted. At this time, the rotary die 4 is driven by a motor (not shown). This adjustment can be confirmed by the operator's eyes.

Next, as shown in FIG. 3, the printer casing 10 is slid on the left crosshead 1 and mounted.
Adjustment is performed while confirming the rotational embossing state by the embossing roll 6. At this time, since the drive motor 8 is already connected to the support frame 72 of the printer casing 10 via the chain 11, the setup time such as the assembly work required in the prior art is not required. Finally, after checking and adjusting all of these, the right side splice box 9 is slid to the left side to close the opening, steam and nitrogen gas are inserted into the splice box 9, and the insulation core wire 3 is extrusion coated. It is manufactured so that the coating resin 2 on the cut fin portion is crosslinked.

[0013]

As described above, since the rotary head for an extruder equipped with the rotary head of the present invention is an embossing printer having a drive system built therein beforehand, the state of the resin coated on the outer periphery of the insulating core wire can be changed. After confirmation, the embossing printer can be mounted by sliding, and the setup time can be greatly shortened, and the generation of scraps can be greatly reduced. The embossing printer case can be attached to both the crosshead and the splice box, and the product that comes out of the water seal at a distance of several hundreds of tens of meters can be checked as in the prior art. Since there is no need to wait, the final confirmation and adjustment can be done at the crosshead, so it is possible to prevent the generation of chips of hundreds of tens of meters.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of extrusion manufacturing of an outdoor cross-linked polyethylene insulated wire with a rotary fin according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state of the device shown in FIG. 1 during initial adjustment.

FIG. 3 is a sectional view showing a state of the device shown in FIG. 1 during a second adjustment.

FIG. 4 is a cross-sectional view showing a conventional extrusion manufacturing structure of a cross-linked polyethylene insulated wire for outdoor use with a rotating fin.

[Explanation of symbols]

 1 Crosshead 2 Covering Resin 3 Insulated Core Wire 4 Dies 5, 5'Bearing 6 Embossing Roll 7 Connecting Rod 8 Drive Motor 9 Splice Box 10 Printer Casing 11 Drive Chain 20 Steam, Nitrogen Gas 71 Guide Rod 72 Support Frame

[Procedure amendment]

[Submission date] January 25, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Murayama 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Cable Co., Ltd. Hidaka factory (72) Inventor Koichi Yamashita 5 Hidaka-cho, Hitachi-shi, Ibaraki 1-1-1 Hitachi Cable Co., Ltd. Hidaka Factory

Claims (3)

[Claims] 1. An extrusion manufacturing method in which a rotary fin for snow-falling is extrusion-covered by an extruder having an insulating core wire with a rotary head, and printing is performed on the rotary fin by an embossing printer, between a crosshead and a splice box. An extruded outdoor cross-linked polyethylene insulated wire, characterized in that the embossing printing device is arranged so that it can be driven with or without connection, and the rotary die is driven together by the rotational driving force of the embossing printing device to manufacture. Production method. 2. An extruder head provided with a rotary die including a resin coating molding crosshead portion, a die rotation driving head device, an embossing printing device, and a splice box, wherein embossing printing is provided between the crosshead and the splice box. The device and the splice box are configured so that they can be translated by a guide rod fixed to the crosshead, and both sides of the printer casing of the embossing printing device are formed so that they can be hermetically engaged with the crosshead and the splice box, respectively. An extruder head equipped with a rotary die, wherein the rotary die is driven by a rotary drive system of an embossing printer. 3. An extruder head having a rotary die according to claim 2, wherein the embossing printing device provided between the crosshead and the splice box can be independently operated without being connected to the die rotary drive head device. An extruder head equipped with a rotary die, which is characterized by easy adjustment.