JPH08306249A - Stranding machine for fiber reinforced electric cable - Google Patents

Abstract

PURPOSE: To prevent the generation of defectives by previously detecting breakage of a fiber of fiber reinforced stranded wire in wire stranding. CONSTITUTION: A holder 21 containing an AE sensor 22 and a radio transmitter 24 is fixed to the vicinity of each bobbin in a rotating cage 12. In stranding a wire, when the rotating cage 12 is rotated around a core wire 7, fiber reinforced stranded wires 1, 1... fed out from the bobbin 13 within a cage 3 are intertwisted on the core wire 7. When a fiber is broken within the fiber reinforced stranded wire 1, an AE emitted from the broken point is detected with the AE sensor 22 within the holder 21, the AE is sent to an analyzing device 30 by radio. Breakage of fibers of the fiber reinforced stranded wire 1 generated in stranding is completely detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twisting machine for fiber-reinforced electric wires, and more particularly to a twisting machine capable of detecting fiber breakage occurring during twisting.

[0002]

2. Description of the Related Art FIG. 5 shows the overall structure of a twisted wire device for ACSR used in overhead power transmission lines and the like. This stranded wire device is provided with a core wire 7 such as a Zn-plated steel wire sent from the pay-off machine 2.
Through a plurality of cage-type twisting machines 3, 3 ... to twist a linear body such as an aluminum wire concentrically around the outer periphery of the core wire 7, and then obtain the electric wire (twisted wire) thus obtained. 9 is measured by the pre-hap measuring machine 4, and then, it is wound around the winding machine 6 via the capstan winding machine 5.

FIG. 6 is a view showing the configuration of the cage type twisting wire machine 3, in which two pedestals 11 standing upright facing each other,
A rotating cage 12 is provided between 11 to surround the core wire 7. In the rotary cage 12, a plurality of supply bobbins 13 each having a linear body with a predetermined length wound are mounted. When the rotating cage 12 is rotated around the core wire 7, the supply bobbin 1
The linear members fed from 3, 13, ... Are twisted around the core wire 7, then compression-molded by a collecting die (not shown) and led out to the downstream side.

By the way, in recent years, a fiber-reinforced composite wire in which a metal is reinforced by ceramic fibers such as SiC has been reduced in weight and weight.
From the viewpoint of increasing the capacity and the like, attempts have been made to use the wires as overhead transmission lines.

FIG. 7 is a view showing a fiber-reinforced electric wire developed for an overhead power transmission line, which is formed by twisting fiber-reinforced composite wires (fiber-reinforced element wires) 1, 1. The fiber-reinforced strand 1 is made of Si
S made by bundling multiple long fibers made of C and compounding them with aluminum
It is composed of an iC / Al composite portion 1a and an Al coating portion 1b in which the SiC / Al composite portion 1a is covered with aluminum. In the case of strands of overhead power transmission lines, SiC /
The Al composite portion 1a is provided, and the aluminum coating portion 1b having good preformability is provided on the outer peripheral portion.

[0006]

When manufacturing the fiber-reinforced electric wire, the cage type twisting machine 3 shown in FIG. 6 may be used as in the case of ACSR. However, the ceramic fibers in the fiber-reinforced strand 1 are weak against shearing force and easily break during twisting. When such fiber breakage occurs, A
Since the tension cannot be borne by l alone, it causes a serious accident such as breakage of the wire and eventually breakage during use. Therefore, in the twisting work of the fiber-reinforced electric wire, it is necessary to detect the presence or absence of the fiber breakage before the wire breakage and exclude the broken part as a defective product.

With respect to this point, various wire breakage detection methods have been proposed in the past, but none have been able to detect fiber breakage in the fiber-reinforced strand. For this reason, there is a concern that the fiber will be shipped as a non-defective product with the fiber broken.

Japanese Patent Publication No. 56-17473 discloses a disconnection detecting device for detecting an abnormal sound generated at the time of disconnection with a microphone. This disconnection detection device can detect disconnection of AS line or the like that emits a very loud sound (sound in the audible range) satisfactorily, but cannot detect fiber breakage that emits only weak vibration in the ultrasonic region.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a twisting machine for fiber-reinforced electric wire which can detect fiber breakage during twisting work and can reliably prevent the generation of defective products. is there.

[0010]

In order to achieve the above-mentioned object, the present invention provides a fiber-reinforced strand from each of a plurality of bobbins mounted in a rotating cage, and In a twisting machine for twisting on a core wire, a fiber breakage during the twisting of the fiber-reinforced strand is detected A
E sensor is installed.

In the present invention, the AE sensor is preferably mounted in the vicinity of the bobbin, but it may be mounted on a pedestal supporting the rotating cage.

[0012]

When the fiber in the fiber-reinforced strand is broken by being sheared during twisting, an elastic wave (AE) of several tens to several hundreds of kHz is generated. Here, the AE sensor (frequency band: several tens of kHz
If several MHz) is installed in advance in the twisting machine, the AE released at the time of fiber breakage can be detected, and the occurrence of fiber breakage can be known. The frequency band of the AE sensor is several tens of kHz.
z to several MHz, and the noise generated during twisting is several hundred to
Since it is several thousand Hz, AE and noise are clearly distinguished.

In the present invention, if the AE sensor is attached near the bobbin, the AE signal can be detected without being attenuated. On the other hand, if it is mounted on a pedestal that supports the rotating cage, the AE signal can be easily detected.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of a twisting machine for fiber-reinforced electric wires. Frames 11 and 1 arranged to face each other
A rotating cage 12 is provided between 1 and 1 so as to be rotatable around the core wire 7 as in the conventional case. In the rotating cage 12, bobbin fixing members 15 are bridged between rotating rings 14, 14 rotatably provided on the pedestals 11, 11 at equal angular intervals in the circumferential direction, and the supply bobbins 13 are attached to these bobbin fixing members 15, 15. It is attached at predetermined intervals. When the rotating cage 12 is rotated around the core wire 7 passing through its center, the fiber-reinforced strands 1 (FIG. 7) fed from the supply bobbins 13, 13 ... Are twisted around the core wire 7 and used for assembly. It is compression-molded by a die and led to the downstream side.

The bobbin fixing member 15 is provided with a substantially columnar holder 21 having an AE sensor built-in for adjoining the bobbin 1 in order to detect the fiber breakage caused by the twisted wire as described above.
It is attached corresponding to the intermediate position of 3,13.

FIG. 2 is a view showing the internal structure of the holder 21. Two accommodation holes 21a and 21b are formed on the upper surface of the holder 21 in parallel with each other.
An AE sensor 22 for detecting fiber breakage is installed therein by being pressed by a cap screw 23. The AE sensor 22 uses an elastic wave (A
E) is detected, and not only partial and total breaks of the fiber bundle in the electric wire but also structural change of the fiber occurring before the break can be detected. A wireless transmitter 24 is tightened by a tightening plate 25 and incorporated in the accommodation hole 21b. The wireless transmitter 24 transmits the AE signal detected by the AE sensor 22 to the outside of the manufacturing line, and is connected to the AE sensor 22 by the connection cable 26.

In FIG. 1, reference numeral 30 is an analyzing device for analyzing the data of the detected AE signal, and 31 is a radio receiver mounted on the analyzing device 30. Further, 32 is an empty bobbin carrier.

In the above structure, the rotating cage 1 when twisted
When 2 is rotated, bobbins 13, 1 in the rotation cage 12 are rotated.
The fiber-reinforced strands 1, 1 ... (FIG. 7) are respectively fed from 3 ..., twisted around the core wire 7, then compression-molded by a not-shown assembly die, and led out to the downstream side.
When a fiber breakage (total breakage or partial breakage) occurs in the fiber-reinforced strand 1 fed from the bobbin 13 during such a twisted wire, elastic waves (AE) in the ultrasonic region are emitted. Here, the bobbins 13, 1 adjacent to each bobbin fixing member 15
Since the AE sensors 12, 12 ... Are provided between the three, the AE generated from the break point easily propagates to the bobbin 13 side, is detected by one of the AE sensors 12, and is detected inside the fiber-reinforced strand 1. All fiber breaks are detected.

The AE signal detected by the AE sensor 22 is
The data is wirelessly transmitted to the analysis device 30 side by the wireless transmitter 24. The AE signal sent to the analysis device 30 side is received by the receiver 31 and then subjected to data analysis. Analyzer 3
At 0, the structural change leading to fiber breakage, the state of breakage, etc. are analyzed from the AE energy detected by each AE sensor 22. Thereby, the fiber breakage that occurs when the fiber-reinforced strand 1 is twisted can be detected in advance and reliably.

FIG. 3 is a view showing an actual observation example of fiber breakage. When the twisting work is performed normally (that is, when the fiber breakage does not occur), as shown in Fig. 3 (a), A
No E signal was detected. The frequency band of noise generated during twisting is several hundreds to several thousands Hz and is not detected by the AE sensor 22. On the other hand, when the fiber breakage occurred in the fiber-reinforced strand 1 during the twisting operation, some AE signals as large as 80 to 100 dB were detected as shown in FIG. 3 (b). As a result, it can be seen that the two can be clearly identified.

As described above, in the twisting machine for fiber-reinforced electric wire of this embodiment, the bobbin mounting member 1 of the rotating cage 12 is used.
Since the AE sensor 22 was attached to the No. 5 at predetermined intervals,
It is possible to detect all the fiber breakages of the fiber-reinforced strands 1, 1 ... During twisting, and it is possible to know in advance the occurrence of fiber breaks occurring during twisting. Therefore, if measures are taken before the fiber in the electric wire is broken, or if the broken part is eliminated, it is possible to avoid producing defective products at all and to increase the reliability of the twisting work. What's more, we don't accidentally ship defective products,
Even when it is used as an overhead power transmission line, it does not cause serious accidents such as wire breakage or total breakage.

In particular, A near the bobbin 13
If the E sensor 22 is installed, the bobbin 13 and the fiber-reinforced strand 1 are in contact with each other and the elastic wave (AE
(Wave) easily propagates to the bobbin 13 side, the attenuation of the elastic wave can be suppressed and detected.

Since the AE sensor 22 is built in the holder 21 and attached to the bobbin fixing member 15,
The E sensor 22 can be attached very easily, and the AE sensor 22 can be protected from the surrounding environment. Moreover, since the wireless transmitter 24 is also incorporated in the holder 21 to wirelessly transmit the detected AE signal, the rotating cage 1
A special mechanism (for example, a slip ring) for taking out a signal from 2 is not necessary, and the structure can be simplified.

Although the holder 21 with the built-in AE sensor 22 is attached to the bobbin fixing member 15 in the above embodiment, it may be attached to the mounts 11 as shown in FIG. If the AE sensors 22 and 22 are mounted on the pedestals 11 and 11, the detected AE signal is attenuated, but is not affected by the rotation of the cage 3.
The AE signal can be easily detected.

[0026]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) By installing the AE sensor in the twisting machine, it is possible to detect the fiber breakage of the fiber-reinforced element wire that occurs during the twisting, in advance and without fail. Therefore, it is possible to prevent the occurrence of any defects in the twisting work of the fiber-reinforced electric wire and to improve the work reliability.

(2) If the AE sensor is attached to the position near the bobbin of the twisting machine, the AE generated when the fiber breaks can be detected without attenuating, and the fiber break can be detected reliably.

(3) An AE signal can be easily detected by mounting the AE sensor on the frame of the twisting machine.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a twisting machine for fiber-reinforced electric wires according to the present invention.

FIG. 2 is a cross-sectional view showing a holder incorporating an AE sensor.

FIG. 3 is a diagram showing an observation example of actual fiber breakage.

FIG. 4 is a perspective view showing another embodiment of the twisting machine for fiber-reinforced electric wire of the present invention.

FIG. 5 is a perspective view showing the overall configuration of a twisted wire device for ACSR.

FIG. 6 is a perspective view showing a schematic configuration of a conventional cage type twisted wire machine.

FIG. 7 is a cross-sectional view showing a schematic configuration of a fiber-reinforced electric wire.

[Explanation of symbols]

 11 Stand 12 Rotating Cage 13 Supply Bobbin 15 Bobbin Fixing Member 21 Holder 22 AE Sensor 24 Wireless Transmitter 30 Analysis Device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Koji Nagano 5-1-1 Hidakacho, Hitachi, Ibaraki Prefecture Hitachi Cable Power Systems Laboratories (72) Inventor Yoko Koda 5 Hidakacho, Hitachi, Ibaraki 1-1-1 Hitachi Cable Co., Ltd. Power Systems Laboratory (72) Inventor Nobuaki Suga 4-10-1 Kawajiri-cho, Hitachi-shi, Ibaraki Hitachi Cable Co., Ltd. Toyoura Plant

Claims (3)

[Claims] 1. A twisting machine for feeding a fiber-reinforced strand from each of a plurality of bobbins mounted in a rotating cage and twisting the stretched fiber-reinforced strand on a core wire. Detects fiber breakage during twisting A
A stranding machine for fiber-reinforced electric wires, which is equipped with an E sensor. 2. The twisting machine for fiber-reinforced electric wire according to claim 1, wherein the AE sensor is attached near the bobbin. 3. The twisting machine for fiber-reinforced electric wire according to claim 1, wherein the AE sensor is mounted on a frame that supports the rotating cage.