JPH03216603A - Method and device for recovering optical fiber cable - Google Patents

Abstract

PURPOSE:To allow the recovering of an optical fiber cable without damaging the cable by forming a lancing part to a pipe which is stopped in rotation and then tearing the pipe to >=2 parts along the lancing part. CONSTITUTION:The pipe 2 which is let out from a delivery device 30 is introduced between a guide roller 32 and a cutter 33 and between a guide roller 34 and a cutter 35 into a guide holder 36. Perpendicular plane parts 2a, 2a are formed on both side parts of the pipe 2 by the cutters 33, 35 during this time. The pipe 2 arrives at the spacing between V-blocks 37a and 37a of a cutter device 37 and the lacing part 2b is formed in the plane parts 2a, 2a by cutting blades 37b, 37b. The pipe 2 is torn longitudinally to two parts; upper and lower parts by winders 40, 40. The torn pieces 2A, 2A are taken up by the winders 40, 40 to expose the optical fiber cable 5. The optical fiber cable 5 is taken up by a take-up device 31 and is thereby recovered without being damaged at all.

Description

Detailed Description of the Invention "Industrial Field of Application" This invention is intended for use in a composite line such as an optical fiber composite overhead ground wire in which an optical fiber cable is housed in a metal pipe. The present invention relates to a device for recovering optical fiber cables in a state of

``Prior Art'' An optical fiber composite overhead ground wire is known as a typical example of a composite wire in which an optical fiber cable is housed inside a metal pipe. Figure 8 shows a Hitotsubashi construction example of this optical fiber composite overhead ground wire.

The optical fiber composite overhead ground wire 1 shown in FIG. It is a structure covered with

To manufacture an optical fiber composite overhead ground wire with this structure,
First, a metal tape is sequentially formed into a cylindrical shape in the length direction so as to wrap the optical fiber cable 5, and the joints of the formed metal tape are sequentially seam-welded along the length direction to form a pipe, and then a die is formed. The pipe 2 containing the optical fiber cable is formed by reducing the diameter to a predetermined diameter. Thereafter, metal wires 3 are sequentially twisted concentrically around the vibrator 2 around the outer periphery of the pipe 2 to form a twisted wire layer 4 over the entire length of the vibrator 2.

The internal structure of the optical fiber cable 5 shown in FIG. 8 is actually a composite multi-core structure, and an example of the internal structure of the optical fiber cable 5 is shown in FIG. 7. .

That is, a plurality of composite wires 8 formed by integrating a plurality of optical fiber cable strands 6 and tension members 7 are buried inside a resin cushion layer 1O together with tension members 9, and a plurality of composite wires 8 (four in the drawing) are embedded. It has a structure in which the outer periphery of the cushion layer IO is covered with a coating layer 11 made of a resin tape such as polyimide.

"Problems to be Solved by the Invention" Conventionally, the optical fiber composite overhead ground wire l has been manufactured using the manufacturing method described above, but when forming the pipe 2 containing the optical fiber cable, welding defects occur. In rare cases, a defect may occur when the metal wires 3 are twisted, and the optical fiber cable-containing tape 2 may need to be scrapped.

However, the optical fiber cable 5 inserted into the inside of the vibrator 2 has a complicated structure and is expensive, as typified by the detailed structure shown in FIG. If there is none, if possible, it is desirable to collect and reuse the optical fiber cable 5 without damaging it.

In addition, if a defect such as a transmission loss occurs in the optical fiber cable 5 for some reason in the optical fiber composite overhead ground wire I, in order to investigate the cause, it is necessary to In some cases, it may be necessary to collect the optical fiber cable 5.

For this reason, the present inventors considered recovering the optical fiber cable 5 from the optical fiber composite overhead ground wire l shown in FIG. First, in order to remove the twisted wire layer 4 from the optical fiber composite overhead ground wire l, it is sufficient to untwist each of the metal twisted wires 3 in sequence from the end side. Next, it is necessary to take out the optical fiber cable 5 from the long metal babe 2, but since the long tube 2 is wrapped around a storage device such as a drum, the babe 2 in this state It is difficult to pull out the optical fiber cable 5 from the pipe, and if you try to pull it out forcibly, there is a problem that the optical fiber cable 5 will be damaged by the sliding resistance between the pipe 2 and the optical fiber cable 5.

Therefore, the present inventors devised an optical fiber cable recovery device having the configuration shown in FIGS. 10 and 11, and attempted to recover the optical fiber cable 5 from the vip 2.

In the recovery device shown in FIG. IO, 15 is a sending device around which the tape 2 containing the optical fiber cable 5 is wound, 1 6.1 7.1 8.1 9 are guide rollers, and 20 is a cutter device. , 2I is winder 2
2 indicates a winding device.

As shown in FIG. 11, the cutter device 20 includes a round rotary blade 20b rotatably mounted inside V-blocks 20a, 20a provided oppositely. By passing the pipe 2 through the space between them, the pipe 2 can be clamped from both sides of the pipe 2 by the rotary blades 20b, 20b. By passing the pipe 2 between 20a, the pipe 2 can be cut into two halves.

In order to take out the optical fiber cable 5 from the pipe 2 using the recovery device having the above structure, the pipe 2 is let out from the delivery device l5, and the guide rollers 16, 17 and the cutter device 2o are removed.
At the same time, the tape 20 cut by the cutter device 2o is passed through the guide rollers 18.19 and the wine goo 21.2.
By tearing the optical fiber cable 5 in two and winding it up using the winding device 22, it should be possible to take out the optical fiber cable 5 from the long pipe 2 continuously without damaging it. Met.

However, when an attempt was made to recover the optical fiber cable 5 from the long pipe 2 using the apparatus having the above structure, it was found that the following problem occurred.

(2) When cutting the pipe 2 with the cutter device 20, the rotary blade 20b of the cutter device 20. By passing the pipe 2 between the pipes 20b, the rotary blades 20b, 20b rotate while biting into the vibrator 2, and cut the pipe 2.

However, in order to completely cut the pipe 2, the distance between the blocks 20a and 20a is reduced and the rotary blades 20b and 20b are
When you try to forcefully bite into the pipe 2, the rotary blade 20
b. 20b bites into the peripheral wall of the pipe 2 and cannot rotate, making it impossible to cut. Furthermore, if you try to make a weak cut, the amount of cut will be small, so there is a problem that you will not be able to tear the pipe 2 with the wine goo 21.21.

■Rotary blade 20b. 20b becomes unable to rotate and the rotary blade 20
b. If the circumferential speed of the blade 20b is slower than the drawing speed of the pipe 2, there is a problem in that the slippage of the cutting edge generates heat, causing seizing and causing the pipe 2 to break.

■The pipe 2 has an outer diameter of 4 to 11 mm and a wall thickness of about 0.5 to 21 mm in a normal optical fiber overhead ground wire. From these dimensions, it is clear that the pipe 2 is thick even though it is thin. As is obvious, if the cutting edges of the rotary blades 20b, 20b are not accurately set at positions that sandwich the center of the pipe 2, there is a problem that tearing becomes impossible.

■Rotary blade 20b. If the pipe 2 is cut while cutting the pipe 20b into the pipe 2, if the cutting amount is too large, the cutting edge of the rotary blades 20b, 20b will reach the optical fiber cable 5 inside the pipe 2.
There is a problem that the optical fiber cable 5 may be damaged.

The present invention was made in order to solve the above problem, and provides a method and apparatus that can recover optical fiber cables housed inside long metal pipes in a healthy state without damaging them. The purpose is to provide.

"Means for solving the problem" In order to solve the problem, the invention stated in claim 1,
In a method for recovering an internal optical fiber cable from a composite line in which an optical fiber cable is housed inside a metal pipe, 211 points or more are symmetrical about the ring core of the pipe on the circumferential surface of the pipe. The circumferential surface of the pipe is cut along the length of the pipe while applying a cutting tool to the position, and the wall thickness of the pipe is reduced to form two or more flat parts on the outer circumference of the pipe. A notch is formed along the flat part of the pipe with the flat part supported and prevented from turning, and then the pipe is torn into two or more pieces along the notch, and an optical fiber cable is extracted from inside the torn pipe. It is something that winds up.

In order to solve the above problem, the invention described in claim 2 has the following features:
In a device that collects internal optical fiber cable from a composite line in which optical fiber cable is housed inside a metal pipe, the circumferential surface of the pipe containing the optical fiber cable taken out from the delivery device is aligned with the axis of the pipe. a cutting device that cuts along the length of the pipe at points symmetrical to the center to form two or more thin flat parts on the circumferential surface of the pipe; A hollow guide holder through which the pipe is inserted while stopping the pipe; a cutter device which forms a notch in a flat part of the pipe that has passed through the guide holder; and a cutter device which tears the pipe into two or more pieces along the notch. This device is equipped with a winder device that takes up the optical fiber cable to the side of the pipe, and a winding device that winds up the optical fiber cable from inside the torn pipe.

``Action'' Use a cutting tool to cut two pieces at symmetrical positions around the metal pipe.
After forming a flat part, a cut part is formed in the flat part, and then the pipe is torn, and the optical fiber cable can be pulled out from inside the torn pipe, causing damage to the optical fiber cable inside the pipe. The undamaged fiber optic cable can be recovered and disposed of. In addition, since the notch can be formed on the flat surface of the pipe while the guide holder is used to prevent the pipe from going around, the cutter device will ensure that the notch is formed in the pipe, and there will be no seizure during the cutting process. , it will not become impossible to cut.

Embodiment FIGS. 1 to 7 are for explaining an embodiment of the present invention. In the collection device shown in FIG. In this case, the pipe 2 containing the optical fiber cable 5 described above is wound so as to be freely drawn out.

This pipe 2 is obtained by, for example, removing the twisted wire layer 4 from the optical fiber overhead ground wire 1 configured as shown in FIG. 8 by untwisting the metal wires 3.

In FIG. 1, reference numeral 3I is a winding device provided apart from the sending device 30, and this winding device 31 is capable of winding up the optical fiber cable 5.

A guide roller 32 and a cutting tool 33 are arranged between the sending device 30 and the winding device 3l, around the area where the babe 2 fed out from the sending device 30 moves, in order from the feeding device 30 side. , a guide roller 34, a cutting tool 35, a guide holder 36, a cutting device 37,
Guide rollers 38.38, 39.39 and winders 40.40 are provided.

The outer circumferential surfaces of the guide rollers 32 and 34 are each formed into a concave curved shape as shown in FIGS. 5 and 6, and rotate while closely contacting the outer circumferential side of the vibrator 2, and move in the length direction of the pipe 2. This allows for

The cutting tools 33 and 35 are in contact with the side surface of the pipe 2 while cutting the first
By rotating in the direction of the arrow in the figure, the side surfaces of each pipe 2 are cut, thereby forming vertical plane portions 2a on both side surfaces of the pipe 2, as shown in FIG. The cutting tools 33 and 35 are rotatably provided by a rotary drive device such as a motor (not shown), and as shown in FIG.
Alternatively, they are arranged on the left and right so that the vipe 2 can be held from the left and right together with 34.

Note that the distance between the outer periphery of the guide roller 32 and the cutting edge of the cutting tool 33 and the distance between the outer periphery of the guide roller 34 and the cutting edge of the cutting tool 35 are both smaller than the outer diameter of the pipe 2, and , the opening is set to be slightly larger than the inner diameter of the pipe 2.

The cutting tools 33 and 35 are preferably made of metal such as cemented carbide tool scraps, but depending on the material of the pipe 2, they may also be a cutting grindstone or the like.

The guide polder 36 is connected to the block 3 as shown in FIG.
A through hole 36b is formed in the center of the through hole 36b, and vertical support surfaces 36c are formed on both inner surfaces of the through hole 36b. 36c
is formed, and the spacing between the supporting surfaces 36c, 36c is the same as that of the flat surface 2a formed on the pipe 2 shown in FIG. 2 The spacing is the same as that of a. As a result, the flat part 2 of the pipe 2
The pipe 2 is formed so that the pipe 2 can pass through the through hole 36b with the a and 2a aligned with the support surfaces 36c and 36c.

As shown in FIG. 7, the cutter device 37 includes V blocks 37a. A round rotary blade 37b is rotatably mounted inside the block 37a. By passing the pipe 2 through the space between the blocks 37a, the pipe 2 can be clamped from both sides of the pipe 2 by the rotary blades 37b and 37b.
a. By passing the pipe 2 between the holes 37a, the flat portion 2a of the pipe 2 can be cut.

As shown in FIG. 1, the winder 40.40 is provided at a predetermined distance vertically from the moving path of the pipe 2, so that the torn piece 2A of the pipe 2 can be wound up by the winder 40.40. It has become.

Next, a method for recovering the optical fiber cable 5 from inside the pipe 2 using the recovery device having the above configuration will be explained.

The vape 2 fed out from the delivery device 30 is introduced into the guide holder 36 through between the guide roller 32 and the cutting tool 33 and between the guide roller 34 and the cutting tool 35.
During this time, vertical flat parts 2a, 2a are cut on both sides of the pipe 2 by cutting tools 33, 35 as shown in FIG.
is formed. At this time, the cutting tools 33 and 35 are all
When cutting a pipe with a wall thickness of about 0.7 to 2 m+s,
Next, the pipe 2 passes through the guide holder 36, but the through hole 3
When the pipe 2 passes through 6b, as shown in Fig. 4,
The flat part 2a of the pipe 2 and the support surface 36 of the guide holder 36
It passes with c matching. With this, pipe 2
passes through the guide holder 36 while being supported by the guide holder 36 so that it cannot move in either the circumferential direction or the left/right direction.

Next, the pipe 2 is inserted into the cutter device 37 as shown in FIG.
It reaches between the blocks 37a, 37a, and as shown in FIG. 7, the flat surface 2a. An incision 2b is formed in 2a.

During the processing, when the rotary blades 37b, 37b try to form the incision 2b on the circumferential surface of the pipe 2, the pipe 2 is pressed by the left and right rotary blades 37b, 37b and tries to spread in the vertical direction; V block 3 above and below pipe 2
7a and 37a to tightly support and prevent spread,
Rotary blade 37b. 37b reliably cuts the flat parts 2a, 2a of the pipe 2 without causing any vertical positional deviation. Further, since the guide holder 36 prevents both the rotation of the pipe 2 and the displacement of the pipe 2, the rotary blades 37b, 37b are
a. You can reliably hit 2a.

Furthermore, the rotary blade 37b. Knock out the spacing between the cutting edges of 37b 2
Since the inner diameter of the rotary blade 37b is made slightly larger than the inner diameter of the rotary blade 37b, the cutting edge of the rotary blade 37b will not penetrate into the inside of the pipe 2 during cutting, thereby eliminating the risk of damaging the optical fiber cable 5. Further, the optical fiber cable 5 is normally located at the lower side of the inner space of the tube 2 due to gravity, and is in contact with the inner bottom surface of the tube 2 . (Refer to Fig. 7) If the left and right parts of the pipe 2 are cut with the rotary blades 37b and 37b in this state, if the rotary blade 37b
．． Even if the optical fiber cable 37b penetrates into the inside of the pipe 2, the optical fiber cable 5 will not be damaged. At this point, the rotary blade 37b. 37b, there is a risk that the optical fiber cable 5 will be damaged.

The l
As shown in the figure, the pipe 2 is vertically torn into two upper and lower parts by the winders 40, 40, and the torn pieces 2A, 2A are wound up by the winders 40, 40.

When the pipe 2 is torn, the optical fiber cable 5 housed inside the pipe 2 is exposed, so that it can be wound up by the winding device 3l without causing any damage to the optical fiber cable 5.

By performing the above operations, the long metal pipe 2
The optical fiber cable 5 can be recovered in a healthy state from inside.

For this reason, conventionally, in the optical fiber composite overhead ground wire monitor having the structure shown in FIG. For example, the entire optical fiber cable was discarded, but the recovery device removes the optical fiber cable 5.
Since the optical fiber cable 5 can be recovered, the optical fiber cable 5 can be recovered and reused in the case of an abnormality as described above. In addition, if an abnormality occurs in the optical fiber cable 5 in the optical fiber composite overhead ground wire l, the optical fiber cable 5 in the part where the abnormality occurs can be recovered without damaging it.
It becomes possible to investigate the cause of abnormality in the optical fiber cable 5.

"Effects of the Invention" As explained above, according to the present invention, the circumferential surface of a long pipe is cut to form a thin flat part, and then an incision is made and then torn to take out the optical fiber cable. The optical fiber cable inside the pipe can be recovered without any damage. Further, since the cut is made in the flat part while the pipe is supported by the guide holder, the cut groove can be accurately formed without causing any displacement of the pipe, and the pipe can be reliably torn.

Therefore, if some kind of defect occurs during the manufacture of the optical fiber composite overhead ground wire, the optical fiber cable can be recovered and reused, whereas conventionally the entire cable must be discarded.

Furthermore, since the pipe after being torn is separate from the optical fiber cable and can be used as a single piece of scrap metal, the value of the pipe after being torn as scrap is also increased.

Furthermore, if a defect occurs in the optical fiber cable in the pipe for some reason, the optical fiber cable can be recovered from the pipe, the cause of the defect can be investigated, and the cause of the accident can be investigated. .

[Brief explanation of drawings]

1 to 7 are for explaining the first embodiment of the device of the present invention, in which FIG. 1 is a plan view of the recovery device, FIG. 2 is a side view showing a part of the recovery device, and FIG. Figure 3 is a sectional view of the pipe with a flat part formed, Figure 4 is a sectional view taken along line A-A in Figure 1, Figure 5 is a sectional view showing one side of the pipe being cut, Figure 6 is a sectional view showing the state in which the other side of the pipe is being cut, Figure 7 is a sectional view taken along line B-B in Figure 1, and Figure 8 is a sectional view showing the state in which the other side of the pipe is being cut.
The figure is a cross-sectional view showing an example of the structure of an optical fiber composite overhead ground wire.
FIG. 9 is an enlarged cross-sectional view showing an example of a Hitotsubashi construction of an optical fiber cable, and FIGS. 10 is a plan view, and FIG. 11 is a side view of the cutter device. l... Optical fiber composite overhead ground wire, 2... Pipe, 2
a... Planar part, 2b... Notch part, 3... Metal cable wire, 4... Twisted wire layer, 5... Optical fiber cable,
30... Sending device, 3l... Winding device, 32.34
... Guide roller, 33.35 ... Cutting tool, 36.
...Guide holder, 37...Cutter device, 37b...
・Rotary blade, 40...winder.

Claims (2)

[Claims] (1) In a method for recovering the internal optical fiber cable from a composite line in which the optical fiber cable is housed inside a metal pipe, two or more locations around the axis of the pipe on the circumferential surface of the pipe are provided. The circumferential surface of the pipe is cut along the length of the pipe while applying a cutting tool to a point symmetrical to the point, and the wall thickness of the pipe is reduced to form two or more flat parts on the outer circumference of the pipe. , Form a notch along the flat part of the pipe with these flat parts supported and prevented from turning,
A method for recovering an optical fiber cable, comprising: then tearing the pipe into two or more pieces along the cut portion, and winding up the optical fiber cable from inside the torn pipe. (2) In a device that collects the internal optical fiber cable from a composite line in which the optical fiber cable is housed inside a metal pipe, the peripheral surface of the pipe containing the optical fiber cable taken out from the delivery device is removed from the pipe. a cutting device that cuts along the length of a pipe at point-symmetrical positions centering on an axis to form two or more thin flat parts on the circumferential surface of the pipe; A hollow guide holder through which the pipe is inserted while preventing its circumference; a cutter device which forms a notch in a flat part of the pipe that has passed through the guide holder; and a cutter device which tears the pipe into two or more pieces along the notch. 1. An optical fiber cable recovery device comprising: a winder device for collecting torn pieces from the inside of the pipe; and a winding device for winding up the optical fiber cable from inside the torn pipe.