JPH06153348A - Over-tension preventing unit for head hauling type cable stretching vehicle - Google Patents

Abstract

PURPOSE:To relax excess stress being applied to a cable when the cable is stretched through the use of a head hauling type cable stretching vehicle. CONSTITUTION:When a cable being stretched using a cable stretching vehicle 20 is subjected to excess stress, an over-tension detector generates an over- tension signal which is transmitted, by radio, from a transmitter 42 to a receiver 44 installed in the cable stretching vehicle 20. Running speed of the cable stretching vehicle 20 is then controlled, for example, in order to relax over- tension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing overtension of a cable such as a communication cable or a power cable when the cable is spanned on a utility pole by a tip-pulling type cable spanning vehicle.

[0002]

2. Description of the Related Art In order to extend a cable over an electric wire, a cable interposition vehicle having a cable towing guide for attaching a tip of the cable to be interrogated is used to tow the cable over the electric pole. Is being conducted sequentially (see Japanese Patent Application Laid-Open No. 3-103015). In addition, since it is necessary to get over the gold car on the utility pole when straddling this cable, we propose an obstacle overcoming device that is attached to the tip of the cable towing pole and operates so that the tip of the cable gets over the gold car. (Japanese Patent Application Laid-Open No. Hei 2
-276408). When the cable is crossed by the cable crossing vehicle, the obstacle overcoming device is attached to the cable pulling guide.

[0003]

However, when the tip end of the cable is pulled by the cable spanning vehicle and crossed over the utility pole in sequence, if an excessive tension is applied to the cable feeding source or a gold wheel, excessive tension is applied. There is a risk that the cable spanning vehicle may become unstable and may fall or break the cable.

An object of the present invention is to avoid the above-mentioned drawbacks and to prevent overtension of a tip-pulling type cable straddle vehicle which is operated so as to relieve the overtension when the cable is overtensioned. To provide a device.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention attaches the tip of a cable to be laid over a plurality of utility poles to a cable traction guide of a cable trolley vehicle and pulls it. An overtension detector installed at the towed end of the cable to be detected to detect the tension above the cable and an overtension signal when the tension above this cable is detected is transmitted to the cable interposition vehicle side. And a receiver that receives an overtension signal on the side of the cable spanning vehicle, and a tension control means that controls the cable spanning vehicle so as to relieve the overtension of the cable by receiving this overtension signal. An object of the present invention is to provide an overtension preventing device for a cable traction vehicle with a tip-pulling type equipped with.

[0006]

As described above, when overtension is applied to the cable spanned by the cable spanning vehicle, this overtension signal is wirelessly transmitted to the cable spanning vehicle so that the cable spanning is relaxed. Since the trolley is controlled, it is possible to reliably prevent the cable trolley from falling and the cable from breaking.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to the drawings, an embodiment of the present invention will be described in detail. FIG. 1 shows a cable spanning vehicle 20 equipped with an overtension preventing device 10 for a tip traction type cable spanning vehicle according to the present invention. . The interposition vehicle 20 has some interposition tools installed on a vehicle main body 24 having a cable drum 22 mounted thereon, and these interposition tools are provided outside a cable towing guide 26 to which the tip of the cable 12 is attached. Further, it includes an obstacle passing tool 28, a manipulator 30, and a cable feeding / winding device 32 attached to the tip of the guide 26 for operating the cable 12 so as to get over the obstacle on the electric pole 14. still,
In FIG. 1, reference numeral 34 indicates a cabin.

The cable 12 is connected to the cable 20.
It is attached to the cable pulling guide 26 of the above and is laid over a plurality of utility poles 14 in order.
Then, the gold wheel 16 is fixed by operating the manipulator 30, and the cable 12 is pulled over the gold wheel 16 by an obstacle rider 28 so as to be crossed.

As shown in FIGS. 1 and 2, the overtension preventing device 10 of the present invention is provided at a pulling end 12a of a cable 12 which is attached to a cable pulling guide 26 and is pulled and bridged. An over tension detector 40 for detecting a tension above a predetermined level, a transmitter 42 for wirelessly transmitting an over tension signal to the cable interposition vehicle 20 when a tension above a predetermined level for this cable 12 is detected, and a cable A receiver 44 that receives an overtension signal on the side of the traveling vehicle 20 and a tension control means 46 that controls the cable traveling vehicle 20 by receiving the overtension signal are provided. Transmitter 42 and receiver 44
Have antennas for transmitting and receiving signals, respectively.

As shown in FIG. 1, the overtension detector 40 and the transmitter 42 (in FIG. 1, the overtension detector 40 is integrally shown in the transmitter 42) are installed in the obstacle overpass 28. The cable 12 is connected to the transmitter 42 by means of suitable gripping means 50, which is connected by means of a connector 48 which can be displaced.

The overtension detector 40 is, for example, as shown in FIG. 3, a limit switch 5 installed in a case 50.
2 and a pressing member 56 that is normally pressed by the compression spring 54 to open the limit switch 52. When a predetermined tension or more is applied, the compression spring 54 is compressed and the pressing member 56 is released from the limit switch 52. It may be a spring-type detector in which the limit switch 52 is closed. Also, as shown in FIG.
The overtension detector 40 is composed of an oil cylinder 60 provided so that the pressure switch 58 is pressure-sensitive. When a tension of a predetermined value or more is applied, the oil pressure in the oil cylinder 60 closes the pressure switch 58. It may be a detector of.

The overtension detector 40 and the transmitter 42 are shown in FIG.
As shown in FIG. 5, the limit switch 52 or the pressure switch 5 in the over tension detector 40, which is connected to the battery power source 62,
The signal is transmitted to the transmitter 42 via 8. Therefore, unless the overtension detector 40 detects the overtension and closes the limit switch 52 or the pressure switch 58, the battery power source 62 is not consumed. In FIG. 2, reference numeral 64 is a check switch for the battery power source 62.

When the receiver 44 receives the overtension signal, the tension control means 46 generates a command signal for alleviating this overtension. In the illustrated embodiment, an alarm display means 66, a traveling control means 68, and a cable pulling guide control means 70 are provided as means for relieving excessive tension, and the tension control means 4 is provided.
A command signal is given from 6 to these means 66, 68, 70 to relieve the tension.

For example, the alarm display means 66 gives an alarm to the driver to reduce the traveling speed of the cable interposition vehicle 20 or to stop the traveling, and the travel control means 68 allows the traveling of the cable interposition vehicle 20. The speed is reduced or the traveling is stopped, and the guide control means 70 controls the cable pulling guide 26 so as to absorb the overtension of the cable 12. It should be noted that any one of these tension relaxing means may be provided.

Next, referring to the operation of the overtension preventing device 10 of the present invention, as shown in FIG. 1, the overtension detector 40 and the transmitter 42 are provided to the obstacle overcoming tool 28 of the cable pulling guide 26. The pulling end 12a of the cable 12 is connected by the gripping means 50, and the cable 12 is crossed by the traveling of the cable straddling vehicle 20. The cable crossing vehicle 20 mounts the gold wheel 16 on each telephone pole 14 by the manipulator 30, and the cable 12 is crossed over the gold wheel 16 by the obstacle rider 28.

When the tension of the cable 12 is below the allowable value, the overtension detector 40 does not generate the overtension signal, and the cable straddle vehicle 20 travels at the normal straddle speed. When the cable 12 is caught on the payout side or the gold wheel 16 and the tension increases, and the tension reaches the allowable limit value, the overtension detector 40 generates an overtension signal, which is an antenna of the transmitter 42. Wirelessly from the cable car 2
0 is received by the receiver 44 through the antenna of the receiver 44 and transmitted to the tension control means 46. Therefore, the alarm display means 66 operates to warn the driver of the overtension, and at the same time, the traveling control means 68 reduces the traveling speed of the cable spanning vehicle 20 or stops traveling.

The cable pulling guide control means 70
Although not specifically shown in the drawings, for example, a telescopic mechanism configured to telescopically extend the cable pulling guide 26 and a pivot mechanism for undulatingly supporting the guide at the base or midway of the guide. And a swivel mechanism that swivels the guide, and is configured to drive and control the expansion mechanism, the pivot mechanism, and the swivel mechanism. In this case, when over tension of the cable 12 is detected,
Although the cable spanning vehicle 20 is traveling normally, the cable pulling guide control means 70 can be operated to prevent overtension.

[0018]

As described above, according to the present invention, when overtension is applied to a cable spanned by a cable spanning vehicle, an overtension signal is wirelessly transmitted to the cable spanning vehicle, and this overstrength signal is transmitted. Since the cable spanning vehicle is controlled so as to relieve the tension, it is possible to reliably prevent the cable spanning vehicle from tipping over or breaking the cable.

[Brief description of drawings]

FIG. 1 is a side view of a tip traction type cable spanning vehicle equipped with an overtensioning prevention device according to the present invention.

FIG. 2 is a system diagram of a signal system of the overtension prevention device of the present invention.

FIG. 3 is a cross-sectional view of an example of an overtension detector used in the present invention.

FIG. 4 is a cross-sectional view of another example of the overtension detector used in the present invention.

[Explanation of symbols]

 10 Tip-pulling type cable over tension prevention device 12 Cable 12a Towing end 14 Power pole 16 Gold car 20 Cable crossing vehicle 22 Cable drum 24 Vehicle body 26 Cable towing guide 28 Obstacle overpass 30 Manipulator 32 Cable feeding / Winding device 34 Cabin 40 Over tension detector 42 Transmitter 42a Antenna 44 Receiver 44a Antenna 46 Tension control means 48 Coupling device 50 Case 52 Limit switch 54 Pressure spring 56 Pressing member 58 Pressure switch 60 Oil cylinder 62 Battery power supply 64 For checking Switch 66 Alarm display means 68 Travel control means 70 Cable towing guide control means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Shiragata 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (1)

[Claims] 1. A cable to be bridged over a plurality of electric poles is attached to a cable towing guide of a cable spanning vehicle and is provided at a tow end of a cable to be bridged to extend over the cable. An over tension detector that detects tension,
A transmitter that wirelessly transmits an overtension signal to the cable interposition vehicle when a tension of a predetermined value or more of the cable is detected, and a receiver that receives the overtension signal on the cable interposition vehicle side, A tension control means for controlling the cable straddling vehicle so as to relieve the overtension of the cable by receiving the overtension signal.