JPH1118232A - Method for laying cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lay a cable, while the cable can be conveniently and surely protected from the action of excessive tension or an abnormal external force, such as deforming force, etc. SOLUTION: In a method for laying a cable, an AC motor in which a vector control type inverter is incorporated in an electric circuit as the driving source of a hauling machine 3 successively provided from roller devices 1 and 4. The speed of the motor is automatically adjusted in a accordance with the load applied to the machine 3 by the action of the inverter, in such a way that the speed is decreased when the load becomes larger and increased, when the load becomes larger. Consequently, a balanced speed relation is established between the roller devices 1 and machine 3. Consequently, a cable 5 transferred by means of the roller devices 1 and machine 3 can be laid in a stable state, without receiving excessive tensions, deforming forces, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a power cable, and more particularly to a method for laying a cable in which a cable can be laid in a stable state without applying an abnormal force to the cable.

[0002]

2. Description of the Related Art As a conventional cable laying method, for example, a cable laying method as shown in FIG. 2 is known.

[0003] This cable laying method is based on a roller device 1, 1, ... along a cable laying route such as an underground line.
Are arranged, and the holing machine 3 is installed at a position connected to the roller devices 1, 1,.
Are fed to the holing machine 3 through the roller devices 1, 1,..., And are sequentially transferred and extended. The roller device 1 is usually provided on a standard route such as a straight route, and The machine 3 is installed in a place such as a shaft where there is a possibility that the cable may slide down.

The roller device 1 and the holing machine 3
Need to be kept the same, and therefore, it is usual to place an observer 9 between the roller device 1 and the holing machine 3.

[0005] Reference numeral 6 denotes a control panel for collectively controlling the operation of the group of roller devices 1, 10 denotes a speed adjusting plate for the holing machine 3, and a monitor 9 is a cable between the roller device 1 and the holing machine 3. By operating the speed adjusting plate 10 while watching the tarmi 11, the speeds of the roller device 1 and the holing machine 3 are synchronized, and the cables 5 are sequentially transferred and extended.

In this operation, particular attention must be paid to the maintenance of the cable to be transferred. For example, it is not possible to apply an excessive tension to the cable 5 or to apply an excessive deformation force such as buckling. It must be strictly avoided, and therefore, the burden on the observer 9 during the laying work becomes large.

In order to reduce the burden on the observer and to further streamline the installation work, for example, a device for detecting the terminal 11 of the cable 5 is installed between the roller device 1 and the holing machine 3. Accordingly, measures such as adjusting the speeds of the roller device 1 or the holing machine 3 to synchronize the speeds of the roller device 1 and the holing machine 3 have been tried.

[0008]

However, according to such a conventional laying method, the working environment is limited as in an underground track, and the work location must be changed frequently each time the laying work is performed. Therefore, the number of devices increases, and the labor and time required for transporting the devices naturally increase accordingly. Further, it cannot be used stably for a long time in a cable installation site where conditions are not good.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cable laying method which can easily and surely protect a cable from the action of an abnormal external force such as excessive tension or deformation force while laying the cable. .

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a roller device for placing and transporting a cable, and a holing machine connected to the roller device for nipping and transporting the cable. Wherein the transfer speed of the roller device is kept constant, and the pinch transfer speed of the holing machine is increased or decreased according to the load received from the pinched and transferred cable. To provide.

The vector control type inverter used in the present invention is an inverter of a type in which a torque component and a magnetic flux component are controlled independently of each other from a supply current. A suitable example is a "J200 series" inverter (sensorless vector control system) manufactured by Hitachi, Ltd.

In general, when an AC motor is controlled by an inverter, the original starting torque and the instantaneous maximum output of the motor are usually reduced. This tendency is particularly observed in a low-speed operation region such as the installation of a power cable. Is remarkable.

To cope with such a phenomenon, it is conceivable to rank up the capacity of the inverter.
However, this also leads, in part, to burnout of the motor, so that the application of the inverter in low-speed operating areas, such as cable laying, has usually not been done.

The feature of the present invention is that the above-mentioned inverter is particularly selected as an inverter which should be originally inappropriate in the field of cable laying, and this is used as an electric circuit of a motor which is a driving source of a holing machine. And that the roller device and the holing machine can be adjusted with an appropriate speed relationship.

That is, the inverter of the vector control system used in the present invention can guarantee a large starting torque and a maximum output torque in a low-speed region for an AC motor. When incorporated, the speed of the machine can be adjusted based on the actual output torque.

The inverter has a function of automatically lowering the motor speed when the load applied to the holing machine is large, and automatically increasing the motor speed when the load is small. The speed of the machine will be perfectly synchronized, so that the cable laying operation will be performed under stable conditions.

In the case where the cable is pulled down while applying a braking force, a method of attaching an external braking resistor to the inverter and treating the heat as heat may be considered. For this, use of a current control type or power regeneration type inverter is conceivable.

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG.

FIG. 1 shows an example of installation on a cable line including a shaft portion in a route, where 1, 1... Are roller devices arranged linearly above a shaft portion 2, Reference numeral 3 denotes a holing machine connected below the shaft 2 and 4, 4
... are roller devices arranged in a line extending further from the holing machine 3, and 5 are these roller devices 1, 4
FIG. 2 shows a cable placed on the top, further pinched and transported by the holing machine 3, and thereby laid on a predetermined track.

Reference numerals 6 and 7 denote control panels for collectively controlling the groups of the roller devices 1 and 4, respectively. Reference numeral 8 denotes an automatic speed adjusting panel of the holing machine 3, in which a driving source of the holing machine 3 is provided. An inverter (not shown) based on a vector control method for controlling the AC motor is built in.

In the case of this embodiment, the cable laying operation proceeds as follows.

First, the roller devices 1, 4 are set to a constant speed of V ₀ , while the holing machine 3 is set to the same speed V ₀ , or a speed V ₁ close thereto.

The holing machine 3 is installed at a special place such as the shaft 2 and its role is to prevent the cable from slipping down. Rather, it should be understood as an entity that exerts a braking force on the incoming cable.

The speed of the holing machine 3 is automatically adjusted so as to be a speed corresponding to the fluctuation of the load from the cable 5 passing therethrough.

That is, the speed of the AC motor of the holing machine 3 is determined by a vector control type inverter that functions based on the load torque of the holing machine 3 received when the cable 5 passes.

Normally, the speed does not coincide with either V ₀ or V ₁ , and the holing machine 3 uses the cable 5
The speed is automatically adjusted such that a good speed balance can always be established with the roller devices 1 and 4 via the roller. That is, when the load applied to the holing machine 3 from the cable 5 increases, the pinching speed of the cable 5 decreases, and when the load decreases, the speed increases.

Therefore, as a result, the cable 5 is transported and laid under a favorable speed balance between the roller devices 1, 4 and the hole machine 3 without receiving an abnormal external force such as excessive tension or deformation force. Will be.

[0027]

According to the cable laying method according to the present invention described above, a motor in which a vector control type inverter is incorporated in an electric circuit is used as a driving source of the holing machine, and a large load is applied to the holing machine. Since the speed of this motor is automatically increased and decreased accordingly, the balance between the roller device and the holing machine is always balanced, so that the cable can be laid in a stable state. Becomes

As described above, in order to prevent the action of tension, deformation force, and the like on the cable, instead of installing a special device for detecting the amount of cable thickening as in the related art, for example, a new device is not provided. Since this is achieved by incorporating a specific inverter into the electric circuit of the motor which is the driving source of the holing machine, the content is simple and practical.

The effect of the present invention in the field of power cable laying is great.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment of a cable laying method of the present invention.

FIG. 2 is an explanatory view of a conventional cable laying method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller apparatus 2 Vertical shaft part 3 Holeing machine 4 Roller apparatus 5 Cable 6 Control panel 7 Control panel 8 Automatic speed adjustment panel

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 000005186 Fujikura Co., Ltd. 1-5-1, Kiba, Koto-ku, Tokyo (72) Inventor Yoshiaki Gomi 2-3-24, Yokota, Atsuta-ku, Nagoya-shi, Aichi Prefecture Chubu Electric Power Company (72) Inventor: Hayato Ishihara 2-3-24 Yokota, Atsuta-ku, Nagoya, Aichi Prefecture Chubu Electric Power Co., Inc.Central Transmission & Substation (72) Inventor: Katsuhiro Nakazawa 2, Yokota, Atsuta-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. Chuo Electric Power Substation Construction Center (72) Inventor Toshio Yamazaki 2-3-24 Yokota, Atsuta-ku, Nagoya City, Aichi Prefecture Chubu Electric Power Co., Inc. Central Power Transmission Substation Construction (72) Inventor Mitsuhiro Ogiso 2-72, Yokota, Atsuta-ku, Nagoya-shi, Aichi Pref. Chubu Electric Power Co., Inc. 2-3-24 Yokota, Atsuta-ku, Nagoya City, Aichi Prefecture Chubu Electric Power Co., Inc., Central Transmission and Substation Construction Plant (72) Inventor Kazuhiko Matsuda 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Tetsuji Miyamoto 2-13-2, Sakurashinmachi, Setagaya-ku, Tokyo Sumitomo Electric Industries, Ltd. Inside the Ground Line Construction Center (72) Inventor Hiroshi Matsumoto 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Hitachi Cable (72) Inventor Kazuaki Yoshida 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd.

Claims (3)

[Claims] In a method of laying a cable, a roller device for placing and transporting a cable and a holing machine connected to the roller device for pinching and transporting the cable are used. , And increasing and decreasing the pinch transfer speed of the holing machine according to the load received from the pinched and transferred cable. 2. The cable laying method according to claim 1, wherein the increase and decrease of the nipping transfer speed of the holing machine are executed by one vector control type inverter provided for one drive motor. 3. The roller device according to claim 1, wherein the roller device is linearly disposed on a flat portion in front of and behind the pier, and wherein the holing machine is provided with a roller device disposed on the rear flat portion below the pier. The method for laying a cable according to claim 1, wherein the cable is laid in front.