JPH08241639A - Method and device for feeding cable core at the time of coating of-cable with metal sheath - Google Patents

Abstract

PURPOSE: To always impregnate a cable core with a fresh insulating oil by supplying the fresh insulating oil into a vacuum drying and oil impregnating furnace through a cable core guide pipe, and feeding a cable core impregnated with the oil to a metal sheath extruding machine. CONSTITUTION: Inside of a furnace main body 1 is discharged through a vacuum pipeline 13, and while the heated steam is flowed to a steam pipeline 11 so as to heat the whole of the furnace main body 1, and a cable core 4 is thereby vacuum-dried. Next, an insulating oil is supplied into the furnace main body 1 through an oil feeding pipeline 14 provided in the furnace main body 1 so that the cable core 4 is impregnated with the insulating oil. Next, a cover 2 is opened, and one end of the cable core guide pipe 8 is arranged inside of the furnace main body 1 so as to be impregnated with the insulating oil, and the other end thereof is connected to a metal sheath extruding machine 10. The cable core guide pipe 8 is vacuumed by a vacuum device 9 so that a fresh insulating oil is supplied from a fresh oil supplying port 31 to the furnace main body 1 through the pipe 8. The cable core 4 is moved from the insulating oil of the furnace main body 1 to the metal sheath extruding machine so that the cable core 4 is coated with the metal sheath. Fresh insulating oil is supplied from the oil supplying port 31 to the extruding machine 10 direction, and the deteriorated oil is discharged form an oil discharging port 32.

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 feeding a cable core when a metal sheath of an OF cable is coated in a manufacturing process of an OF cable, and more particularly to a method and an apparatus for feeding a cable core useful for a long OF cable. It relates to the device.

[0002]

2. Description of the Related Art In a method for manufacturing an OF cable, a vacuum-dried cable core is coated with a metal sheath such as a lead sheath or an aluminum coating under vacuum, and then the inside of the cable is inserted from one end of the metal sheath cable. The method of injecting insulating oil into the vacuum dryer and the method of vacuum-drying the cable core stored in the vacuum drying kettle and then pouring a large amount of insulating oil into the kettle and immersing the entire length of the cable core in pressurized insulating oil There is a method of oil impregnation. The former vacuum sheath method is approximately several k
Applies to relatively short distance cables with lengths from m to 10 km. On the other hand, the latter mass impregnation method is several tens of k
It is suitable for oil impregnation of long-distance cables of m-class, and is mainly applied to long-distance cables with a continuous length such as submarine cables.

In the conventional mass impregnation method, for example, a cable core feeding device as shown in FIG. 6 is used. Figure 6
In FIG. 1, reference numeral 1 is a pot body of an annular vacuum-dried oil impregnated pot whose center axis is the line AA, and 2 is a lid portion which is airtightly placed on the pot body 1 via packing. A turntable 3 is rotatably provided on the bottom of the shuttle main body 1. Wheels 5 and rails 6 are installed below the turntable 3, and the turntable 3 is rotated by a drive unit 7. Reference numeral 4 denotes a paper-insulated cable core wound in a line in the hook body 1. Steam pipes 11 for heating are attached to the outer peripheral surface, the inner peripheral surface and the bottom surface of the pot main body 1 and the bottom surface of the lid portion 2, and these steam pipes 11 are covered with a heat insulating material 12. FIG. 7 is a cross-sectional view of the cable core feeding device when the metal sheath is covered. In the figure, 8 is a cable core guide pipe, which is composed of a siphon tube that is evacuated by a vacuum device 9. The lower end of the cable core guide pipe 8 is in the oil in the shuttle main body 1, and the other end is connected to the metal sheath extruder 10.

Using the above-described cable core feeding device, feeding of the cable core when the OF cable is covered with the metal sheath is performed as follows. That is, 1) First, a paper-wrapped insulated cable core 4 covered with insulating paper.
After being wound into the pot body 1 and the lid part 2 is airtightly covered, while heating the inside of the pot body 1 through the vacuum piping 13 provided in the lid part 2, the heating steam is flown through the steam pipe 11 to feed the pot. The cable core 4 is vacuum-dried by heating the inside of the main body 1. 2) After confirming that the cable core 4 is dried by such vacuum drying, the pot body 1 is filled with insulating oil through the oil supply pipe 14 provided in the pot body 1 to impregnate the cable core 4 with the insulating oil. 3) Next, the lid 2 is opened, and as shown in FIG. 7, the lower end of the cable core guide pipe 8 is placed in the oil of the kettle body 1, and the cable core 4 is extruded from the oil of the kettle body 1 with a metal sheath. It is fed to the machine 10 through the cable core guide pipe 8 by the rotation of the hook main body 1. In this way, the cable core 4 of the OF cable impregnated with the insulating oil deteriorates its insulating characteristics when gas (mainly air) is dissolved in the insulating oil. Therefore, the cable main body 1 is not exposed to the atmosphere.
From the insulating oil to the metal sheath extruder 10, the cable core guide pipe 8 is fed.

[0005]

Recently, OF cables have been required to be manufactured without a long connection. In this case, when the long cable core is coated with the metal sheath at a low linear velocity by the above method, the insulating oil in the pot body is exposed to the atmosphere for a considerable period of time. As a result, gas (air) is dissolved in the insulating oil from the insulating oil surface (atmosphere contact surface) in the kettle body. Therefore, a certain distance is taken from the surface of the insulating oil in the pot body to the dipped cable core, but there is still a problem that the gas in the oil reaches the insulating layer of the cable core and the insulating characteristics deteriorate.

[0006]

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for feeding a cable core when a metal sheath of an OF cable is coated to solve the above-mentioned problems. The cable core, which is vacuum dried, oil-impregnated, and oil-impregnated, is placed in the vacuum-drying oil-impregnated pot at one end, and the other end is passed through a cable core guide pipe connected to a metal sheath extruder, In a method of feeding a cable core when a metal sheath of an OF cable is fed to a sheath extruder, a new insulating oil which is not gas-dissolved is supplied to the vacuum drying oil impregnating pot through the cable core guide pipe, and an old insulation gas-dissolved is also used. While the oil overflows from the vacuum-dried oil impregnation pot and is drained, the oil-impregnated cable core is replaced with the new insulating oil. Through the cable core guide pipe being refueling, the method feeding cable core during the metal sheathing of the OF cables, characterized in that for feeding in a metal sheath extruder and the first invention.

Further, there is provided a vacuum core for impregnating a cable with a vacuum drying oil and a cable core guide pipe for guiding the cable core to the metal sheath extruder, which is an apparatus for carrying out the cable core feeding method when the metal sheath of the OF cable of the invention is covered. And the vacuum drying oil impregnating pot has means for overflowing old insulating oil that has dissolved gas, and the cable core guide pipe has means for supplying new insulating oil that has not dissolved gas in the guide pipe. A cable core feeding device for covering an OF cable with a metal sheath is defined as a second invention.

[0008]

As in the first and second inventions described above, old insulating oil is overflowed from the vacuum drying oil impregnating pot while supplying fresh insulating oil into the vacuum drying oil impregnating pot through the cable core guide pipe. Then, in the vacuum drying oil impregnation pot, the surface layer portion of the insulating oil that has come into contact with the air flows out and fresh insulating oil is replenished, so that the cable core is always impregnated with fresh insulating oil.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of an embodiment of a cable core feeding device for covering an OF cable with a metal sheath according to the present invention, and FIG. 2 is a diagram showing the device in which one end of a cable core guide pipe is arranged in a hook body. FIG. Further, FIG. 3 is a cross-sectional view showing a state in which the overflow surface of the above apparatus is changed. Reference numerals in the drawings indicate the same parts as the same reference numerals in FIGS. 6 and 7 used in the description of the conventional technique.

In FIG. 1, the pot body 1 of the vacuum dried oil impregnated pot has a donut shape, and has an outer tubular portion 21 and an inner tubular portion 22.
And a pot bottom portion 23 that connects these two cylinders. A doughnut-shaped lid portion 2 is airtightly covered on the upper portion of the kettle body 1 through packing, as in the case of the kettle body 1.
In addition, a turntable 3 that can rotate freely is attached to the bottom of the hook body 1.
Is provided, wheels 5 and rails 6 are installed below the turntable 3, and the turntable 3 is rotated by a drive device 7. Further, the steam pipe 11 for heating is provided on the outer peripheral surface, the inner peripheral surface and the bottom surface of the pot main body 1 and on the bottom surface of the lid portion 2.
Are attached, and these steam pipes 11 are covered with a heat insulating material 12. In FIG. 2, the cable core guide pipe 8 is
One end is arranged in the kettle body 1 and the other end is connected to the metal sheath extruder 10, and the oil-impregnated cable core 4 in the kettle body 1 is covered by the metal sheath extruder 1 to cover the metal sheath.
It is supposed to guide you to 0.

As a method of sending out the cable core 4,
As shown in FIGS. 1 to 3, the method of placing the shuttle body 1 on the turntable 3 is not limited. That is, FIG.
As shown in FIG. 5, a method of installing the wheels 5 on the hook main body 1, and as shown in FIG. 5, an outer hook 41 that does not rotate and a rotating turntable 42 installed in the outer hook 41.
And an oil tank 43 provided on the turntable 42 may be used.

In addition, 33 is an overflow pipe which is a means for overflowing the insulating oil provided in the inner cylinder portion 22 of the kettle main body 1, and 34 is provided inside the inner cylinder portion 22 of the kettle main body to temporarily store the overflowed oil. Is a donut-shaped oil drain tank, 35 is an oil drain pipe, and 36 is an oil drain pump.
In FIG. 2, the cable core guide pipe 8 is evacuated by the evacuation device 9, and new insulating oil which is not gas-dissolved is refueled from a new oil refueling port 31 connected in front of the inlet of the metal sheath extruder 10. To be done.

Using the above apparatus, the cable core is coated with a metal sheath by the following procedure. 1) First, in the state shown in FIG. 1, while evacuating the inside of the pot main body 1 through the vacuum pipe 13, the steam pipe 11 is heated to flow the heating steam to heat the entire pot main body 1. Vacuum dry. 2) After confirming that the cable core 4 has been dried by vacuum drying, insulating oil is fed into the pot body 1 through the oil supply pipe 14 provided in the pot body 1 to impregnate the cable core 4 with the insulating oil. 3) Next, as shown in FIG. 2, the lid 2 is opened, one end of the cable core guide pipe 8 is placed in the pot body 1 and immersed in insulating oil, and the other end is connected to the metal sheath extruder 10. . 4) Next, the cable core guide pipe 8 is evacuated by a vacuuming device 9, and a new fresh oil which is not gas-dissolved in the cable core guide pipe 8 from a new oil supply port 31 connected in front of the inlet of the metal sheath extruder 10. The insulating oil is supplied to the pot body 1 of the vacuum drying oil impregnation pot. 5) Move the cable core 4 from the insulating oil in the kettle body 1 to the metal sheath extruder 10 in the cable guide pipe 8 to which new insulating oil has been fed, in the direction opposite to the moving direction of the new insulating oil, A metal sheath is coated on the cable core 4. Further, new insulating oil is supplied from the new oil supply port 31 toward the metal sheath extruder 10 as well, and oil deteriorated near the metal sheath extruder 10 is discharged from the oil discharge port 32.
During this period, supply of new insulating oil is continued.

In the step of coating the metal sheath, the amount of new insulating oil supplied from the new oil supply port 31 is set to be larger than the amount to compensate for the decrease in the oil level due to the feeding of the cable core 4, The supplied oil above the surface drop supplement overflows from the overflow pipe 33. At this time, the oil overflowing from the overflow pipe 33 is old insulating oil in the vicinity of the oil surface in which the gas is dissolved, so that the cable core 4 is always covered with fresh insulating oil in which the gas is not dissolved. become.
The oil overflowed from the overflow pipe 33 is temporarily stored in an oil drain tank 34, and returned to a new oil regenerating device (not shown) by the oil drain pipe 35 and the oil drain pump 36 for reuse.

When the cable core 4 is sent out to the metal sheath extruder 10 by continuing the above steps, the position of the uppermost layer of the cable core 4 in the pot body 1 is gradually lowered. At this time, if the level of the overflow of the insulating oil is constant, a large amount of insulating oil is finally required, and the insulating oil tank and the new oil regenerating device need to be large in size. Therefore, in this embodiment, as means for changing the level of overflow, as shown in FIGS. 1 and 2, three overflow pipes 33 are provided at positions of different levels in the inner cylinder portion 22. Then, as shown in FIG. 3, depending on the position of the uppermost layer of the cable core 4, the overflow pipes 33 to be used automatically or manually are sequentially lowered from the upper one. By doing so, the amount of insulating oil used can be suppressed, and the equipment such as the insulating oil tank and the new oil remanufacturing device can be downsized to the minimum necessary scale.

[0016]

As described above, according to the present invention, O
The cable core of the F cable is housed in a vacuum dried oil impregnated kettle, vacuum dried, oil impregnated, and the oil impregnated cable core is arranged at one end in the vacuum dried oil impregnated kettle and the other end is a metal sheath. In a cable core feeding method for covering a metal sheath of an OF cable fed to a metal sheath extruder through a cable core guide pipe connected to the extruder,
While supplying new insulating oil that is not gas-dissolved into the vacuum drying oil impregnating kettle through the cable core guide pipe, the gas-dissolved old insulating oil is overflowed from the vacuum drying oil impregnating kettle and oil is impregnated while draining oil. The following effect can be obtained by sending the cable core to the metal sheath extruder through the cable core guide pipe filled with the new insulating oil.

That is, the cable core is constantly covered with fresh insulating oil without gas dissolution until the cable core is sent out from the vacuum drying oil impregnating pot, passed through the cable core guide pipe and supplied to the metal sheath extruder. Also, in the vacuum drying oil impregnated pot, the surface layer of the insulating oil that has come into contact with the air flows out and fresh insulating oil is replenished, so the cable core is always covered with fresh insulating oil and the reliability of the OF cable is improved. Can be improved. When a plurality of overflow pipes of different levels are provided as means for overflowing old insulating oil from the vacuum-dried oil impregnating pot, the amount of insulating oil used can be suppressed, and the insulating oil tank, new oil There is an economic effect that equipment such as a remanufacturing device can be downsized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a cable core feeding device when a metal sheath of an OF cable is covered according to the present invention.

FIG. 2 is a cross-sectional view of the above apparatus, showing a state in which one end of a cable core guide pipe is arranged inside a hook main body.

FIG. 3 is a cross-sectional view of the apparatus, showing a state in which the overflow surface is changed.

FIG. 4 is a sectional view of another embodiment of the cable core feeding device according to the present invention.

FIG. 5 is a cross-sectional view of still another embodiment of the cable core feeding device according to the present invention.

FIG. 6 is a cross-sectional view of a conventional cable core feeding device when a metal sheath of an OF cable is covered.

FIG. 7 is a cross-sectional view of the above apparatus, in which one end of the cable core guide pipe is arranged inside the hook main body.

[Explanation of symbols]

 1 Kettle Main Body 2 Lid 3, 4 Turntable 4 Cable Core 5 Wheel 6 Rail 7 Drive 8 Cable Core Guide Pipe 9 Vacuum Evacuation Device 10 Metal Sheath Extruder 11 Steam Piping 12 Heat Insulation 13 Vacuum Piping 14 Oil Supply Piping 21 Outer Cylinder Part 22 Inner cylinder part 23 Bottom part 31 New oil supply port 32 Oil discharge port 33 Overflow pipe 34 Oil discharge tank 35 Oil discharge pipe 36 Pump 41 Outer pot 43 Oil tank

Claims (2)

[Claims] 1. A cable core of an OF cable is housed in a vacuum drying oil impregnated kettle, vacuum dried, oil impregnated, and oil impregnated, and one end of the cable core is arranged in the vacuum drying oil impregnated kettle. In a method of feeding a cable core when a metal sheath of an OF cable is fed to a metal sheath extruder through a cable core guide pipe having the other end connected to a metal sheath extruder, a gas is introduced into the vacuum drying oil impregnated pot through the cable core guide pipe. While supplying new undissolved insulating oil, while discharging old insulating oil gas dissolved from the vacuum drying oil impregnating pot,
A cable core feeding method for covering an OF cable with a metal sheath, comprising feeding the oil-impregnated cable core to the metal sheath extruder through the cable core guide pipe to which the new insulating oil is supplied. 2. A device for carrying out the method for feeding a cable core when a metal sheath of an OF cable is covered according to claim 1, which is a vacuum drying oil impregnated pot, and a cable core guide for guiding the cable core to a metal sheath extruder. A pipe is provided, the vacuum drying oil impregnated pot has means for overflowing old insulating oil that has dissolved in gas, and the cable core guide pipe supplies new insulating oil that has not dissolved in gas into the cable core guide pipe. A cable core feeding device for covering an OF cable with a metal sheath.