JPH0870518A - Cable extending system - Google Patents

Abstract

PURPOSE: To make it easier to control the cable extending work by providing means for detecting the presence of a cable on each extending equipment, transmitting the information of the equipment controlled by a plurality of subcontrollers and then displaying it by the main controllers. CONSTITUTION: Sub-controllers 13 for controlling the operation of each carrying motor performing the extending work for cable C are provided near respective extending equipment 3, and the voltage and current supplied to each motor are detected to check whether the cable C is present at the extending equipment 3. A main controller 14 is installed at respective sub-controllers 13 near the cable drum 1 for centrally controlling the sub-controllers. By doing this, a worker controlling at the main controller 14 can detect the presence of cable at each extending equipment 3 and thus can know the carrying situation of the cable and easily confirm visually the progress of the cable extending work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of wire drawing devices for conveying a cable drawn out from a cable drawing part and extended in a cable extending direction, at appropriate intervals along the cable extending direction. The present invention relates to a cable drawing system in which a main control unit and a plurality of sub-control units that separately manage the operation of each of the drawing devices are communicably connected to each other.

[0002]

2. Description of the Related Art The above cable extension system is, for example,
A system for sequentially feeding and extending long cables such as electric power cables and communication cables, and laying them. The sub-control unit provided corresponding to each wire drawing device is centrally managed by the main control unit. By doing so, the work is streamlined. By the way, in such a cable drawing system, conventionally, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Laid-Open Patent Publication No. 76114, between the main control unit (master station centralized control panel) and each sub control unit (slave station control box), a control cable connected over them is used in a multiplex transmission system. It is configured so that telephone communication is possible, and the work status of the cable extension work can be made so that the worker on the sub-control side can contact the management worker on the main control side by telephone. there were.

[0003]

However, in the above-mentioned conventional configuration, the progress of the cable drawing work such as to which point the tip of the cable is drawn is determined by the worker on the sub control unit side. If no telephone contact is made,
The management operator on the main controller side could not make a decision, and there was a possibility that work management could not be carried out smoothly, and there was room for improvement in this respect. In addition, when the number of workers arranged at appropriate places along the cable extension direction is reduced to save labor, etc., if an abnormality occurs in the drive control system of the wire extension device, management work is performed. There is also a disadvantage in that the person cannot determine to what point the tip of the cable has reached, and therefore cannot give an appropriate instruction for the subsequent recovery work. The present invention has been made paying attention to such a point, and an object thereof is to make it easy to manage a cable drawing work state and to improve work efficiency. The point is to provide the system.

[0004]

The features of the first invention are as follows:
A plurality of wire-drawing devices for conveying the cable drawn out from the cable drawing-out part and extending in the cable-drawing direction are installed at appropriate intervals along the cable-drawing direction, and the main control part and each of the above-mentioned devices are installed. In a cable drawing system in which a plurality of sub-control units that individually manage the operations of the respective drawing devices are communicatively connected, it is detected whether or not the cable is present in each of the drawing devices. A cable presence / absence detecting unit is provided, each of the plurality of sub-control units is configured to communicate the cable presence / absence information of the cable presence / absence detecting unit for the wire drawing device managed by itself to the main control unit, The main control unit causes the display unit to display the cable presence / absence state of each of the wire drawing devices based on the cable presence / absence information communicated from each of the sub-control units. There is the point that has been made.

A characteristic structure of the second invention is to specify a structure suitable for carrying out the first invention, in which the sub-control unit manages the wire drawing device managed by itself, together with the cable presence / absence detection information. Of the cable transport amount information to the main control unit, the main control unit, the cable presence detection information, the cable transport amount information, and
Based on the installation interval information of the wire drawing device, predict the timing at which the cable carried from the wire drawing device that started carrying the cable reaches the next wire drawing device, and reach the predicted timing. Also, when the presence of a cable for the next wire drawing device is not detected, it is determined that an abnormal state has occurred, and the abnormality notifying means is activated.

A characteristic configuration of the third aspect of the invention is to specify a configuration suitable for implementing the second aspect of the invention, wherein the main control section discriminates the occurrence of the abnormal state, and the plurality of sub-systems are operated. It is configured to issue a stop command to each of the control units.

A characteristic configuration of the fourth invention is to specify a configuration suitable for carrying out the second or third invention, in which the main control section is provided with the cable presence / absence detection information, the cable transport amount information, and , Predicting the tip position of the cable between the wire drawing device that has started to convey the cable and the next wire drawing device based on the installation interval information of the wire drawing device, and displaying the predicted position It is configured to be displayed on.

The characteristic features of the fifth invention are the first, second and third aspects.
Alternatively, the configuration suitable for carrying out the fourth aspect of the invention is specified, and the main control unit sets the wire drawing device when the predicted tip position of the cable reaches near the next wire drawing device. It is configured to instruct a sub-control unit that manages the wire drawing device to drive at a speed.

The characteristic configuration of the sixth invention specifies a configuration suitable for carrying out the first, second, third, fourth or fifth invention, and each of the wire drawing devices is a cable. It is configured to be driven by an electric motor for transportation, and the sub-control unit is configured to drive the electric motor at a set speed before the cable reaches the wire drawing device managed by the sub-control unit. The cable presence / absence detection unit is configured to determine that the cable has changed from a non-existing state to an existing state as a current value when the electric motor is driven at a set speed increases above a set reference value. There is a point.

A characteristic configuration of the seventh invention is to specify a configuration suitable for carrying out the sixth invention, wherein the cable presence / absence detecting means changes the current value from a value smaller than the set reference value to a large value. It is configured to detect the timing of change and assume that the cable is present after that timing.

[0011]

According to the characterizing feature of the first invention, the cable presence / absence detecting means provided in each of the plurality of wire drawing devices installed at appropriate intervals along the cable drawing direction causes Whether or not a cable is present is detected, and cable presence / absence information is communicated from each sub control unit to the main control unit and displayed on the display means.

According to the characterizing structure of the second invention, the following function is obtained in addition to the function of the characterizing structure of the first invention. Each sub-control unit communicates the above-mentioned cable presence / absence detection information and the information about the amount of cable transportation such as the cable transportation speed to the main control unit, and the main control unit sets these information and preset extension information. The timing to reach the next wire drawing device is predicted from the installation interval information of the wire drawing device. That is,
The time required to reach the next wire drawing device from the time when the presence of a cable is detected in one wire drawing device, and therefore the timing to reach the next wire drawing device is the installation interval (distance to the next wire drawing device). ) Information and transport amount (speed) information,
It can be predicted. Then, if the presence of the cable is not detected by the next wire drawing device at the timing thus predicted, it is determined that there is an abnormal state, and the abnormality notification means is activated to notify the operator that an abnormality has occurred. is there. Even when this abnormality occurs, the operator can confirm to which point the cable is extended by the display means.

According to the characteristic configuration of the third invention, the following operation is provided in addition to the operation of the characteristic configuration of the first or second invention.
When the occurrence of the abnormal state is determined, the main control unit issues a stop command to each of the plurality of sub control units, so that the wire drawing devices stop the cable transport operation almost at the same time.

According to the characteristic configuration of the fourth invention, the first and second aspects are provided.
Alternatively, the following operation is provided in addition to the operation according to the characteristic configuration of the third invention. The main controller predicts the tip position of the cable based on the above information and displays it on the display means, so that the progress of the cable drawing work can be confirmed more accurately.

According to the characterizing feature of the fifth invention, there are the following effects in addition to the effects of the characterizing feature of the first, second, third or fourth invention. When the predicted tip position of the cable approaches the next wire drawing device, the next wire drawing device starts driving based on a command from the main control unit to the sub control unit. Therefore, it is possible to effectively drive only the wire drawing device with or near the cable as compared to the case where the wire drawing work is performed while keeping all the wire drawing devices in the driven state. it can.

According to the characterizing feature of the sixth invention, there is the following function in addition to the function according to the characterizing feature of the first, second, third, fourth or fifth invention. When the cable reaches the wire drawing device that is driven by the electric motor, the current value of the electric motor that is driven at the set speed before it reaches the wire speed increases as the load increases. Is greater than the set reference value, it is judged that there is a cable carrying load,
It is determined that the cable exists.

According to the characterizing feature of the seventh invention, in addition to the function of the characterizing feature of the sixth invention, there is the following effect. After the timing when the current value of the electric motor changes from a value smaller than the set reference value to a large value as the load increases, it is determined that the cable exists. Therefore, even if the electric current value of the electric motor is below the set reference value or exceeds the set reference value a plurality of times after the set reference value is exceeded when the load changes, By once determining that the cable is present after the above timing is detected, erroneous detection due to an unstable current value can be prevented.

[0018]

According to the characterizing feature of the first invention, the presence or absence of a cable is detected by each wire drawing device, so that the carrying condition of the cable can be surely detected, and the work is managed by the main controller. From the information displayed on the display means
You can easily visually check the progress of the cable drawing work, which wire drawing device the wire has been drawn to, and work management is more efficient than when other workers need to be contacted. You can do it well.

According to the characterizing structure of the second invention, the following effect is obtained in addition to the effect of the characterizing structure of the first invention. As described above, when the wire drawing device does not arrive at the predicted timing, the abnormality notification means operates, so that it is possible to recognize that an abnormality has occurred and to promptly take measures after that. Can be done efficiently.

According to the characterizing structure of the third invention, the following effects are obtained in addition to the effects of the characterizing structure of the first or second invention.
When the cable is not properly extended, it is possible to reliably avoid the inconvenience of continuing the wire extension work by mistake, and it is easy to perform the subsequent recovery work so that work management can be performed efficiently. .

According to the characteristic configuration of the fourth invention, the first and second
Alternatively, there are the following effects in addition to the effects of the characteristic configuration of the third invention. Since the progress status of the cable drawing work can be confirmed more accurately, the management work becomes easier.

According to the characterizing feature of the fifth invention, the following effect is obtained in addition to the effect of the characterizing feature of the first, second, third or fourth invention. The wire-drawing work can be continued without placing a worker near each wire-drawing device, and the wire-drawing work can be automated. Moreover, there is an advantage that it is possible to prevent wasteful power consumption.

According to the characterizing structure of the sixth invention, the following effects are obtained in addition to the effects of the characterizing structure of the first, second, third, fourth or fifth invention. Since the cable presence / absence is determined based on the current value of the electric motor, the presence / absence of the cable can be detected without complicating the configuration such as providing a dedicated cable presence / absence sensor.

According to the characterizing feature of the seventh invention, the following effect is obtained in addition to the effect of the characterizing feature of the sixth invention. It is possible to accurately detect the presence or absence of the cable regardless of the change in the electric current value of the electric motor.

[0025]

Embodiments will be described below with reference to the drawings. FIG.
As shown in FIG. 3, a cable drum 1 around which a long power cable C (an example of a cable) is wound is installed at a predetermined location on the ground, and the cable C fed from this cable drum 1 is formed underground. The cable drawing system is configured so that the inside of the cable laying tunnel 2 is sequentially extended and extended.

In the vicinity of the cable drum 1 serving as the cable feeding portion, the cable C from the cable drum 1 to the cable C
A wire drawing device 3 for pulling out the cable is installed, and the cable extended from the wire drawing device 3 and extended is guided into the tunnel 2 through the introduction path. In the tunnel 2, a plurality of wire drawing devices 3 are installed at appropriate intervals (for example, several tens of meters to several hundreds of meters) along the cable extending direction, and each wire drawing device 3 sequentially operates one by one. The cable C is configured to be extended and extended. A plurality of guide rollers 4 are provided between the wire drawing devices 3 so that the cable C can be smoothly drawn out and extended with less friction.

In the wire drawing device 3, as shown in FIG. 2, a pair of left and right endless wire drawing belts 5a and 5b are wound around the driving sprocket 6 and the driven sprocket 7, respectively, and the left and right extending wires are extended. The working surfaces 8a of the wire belts 5a, 5b,
8b are arranged so as to face each other, and each of the wire-drawing belts 5a, 5
When the cable C is clamped by the action surfaces 8a and 8b of b, they are rotationally driven in a synchronous state,
The cable C is configured to be extended and extended. The interval between the wire-drawing belts 5a and 5b is set to an appropriate interval at which the cable C is clamped with an appropriate clamping force.

Further, each drive sprocket 6 has a gear mechanism 9 linked to an output shaft of a cable conveying drive motor M.
Pair of flexible rotary shafts 10, 1 driven via
1 is interlockingly connected and is configured to be rotationally driven in the opposite direction in a synchronized state.

Near each wire drawing device 3 in the tunnel 2,
A sub-control device 13 is provided as a sub-control unit for controlling the wire drawing work state of the cable C, that is, the operation of each conveyance motor M, and each sub-control device 13 is provided near the cable drum 1. A main controller 14 is provided as a main controller that is communicably connected and centrally manages these.

As shown in FIG. 3, each sub-control unit 13
Is a motor controller 15 for controlling the operation of the drive motor M,
As will be described later, the current detection unit 30 that detects the current value of the drive motor M, the voltage detection unit 31 that detects the voltage supplied to the drive motor M, and the wire drawing device 3 based on the detection information of the current detection unit 30. A cable presence / absence determining unit 18 as a cable presence / absence detecting unit that determines whether or not the cable C exists.
Etc. are provided.

Each drive motor M is composed of a three-phase AC induction motor, and each motor control unit 15
Is configured to perform variable speed control of the drive motor M based on a sliding frequency vector control method in which the current supplied to the drive motor M is controlled based on the torque component and the magnetic flux component. Further, the motor control unit 15 is configured to execute the vector control based on the actual rotation feedback information of the drive motor M detected based on the actual drive current and the actual drive voltage in the drive motor M. .

That is, the motor controller 15 is instructed by the main controller 21 to drive speed command information and preset magnetic flux command information, and the command information is sent to the drive motor M as shown in FIG. Current component Im (field current) that creates a field in the supply current I ₁ of the above and a current component I ₂ (torque current) that generates a rotation torque orthogonal to this field and are controlled independently. Then, these are vector-synthesized and given to the drive motor M. Therefore, it is configured such that the speed response to the speed command is excellent and a predetermined drive torque can be exerted even in the starting state in which the speed is low.

That is, as shown in FIG. 5, the speed control unit 25 for calculating the torque current component I ₂ based on the speed command information ω ₁ and the actual speed information ω ₂ information obtained as described later, Based on the current component I ₂ and the field current component Im, vector synthesis of these values is executed to obtain the scalar amount I ₁ of the supply current and the phase between the torque current component I ₂ and the field current component Im. Vector control unit 2 for finding the angle α
6. A calculation unit 27 that calculates the slip frequency information ω ₃ based on the torque current component I ₂ and the field current component Im, and a scalar amount I of the supply current output from the vector control unit 26.
₁ and detected by the current control unit 29, the current detection unit 30, and the voltage detection unit 31 that control the current for supply to the inverter 28 based on the added value of the phase angle α and the magnetic flux phase angle β obtained as described below. Based on the detected information of the actual current and voltage flowing through the drive motor M, the drive motor M
In actual current calculating section 32 for calculating the actual torque current component I _2FB, based on the difference between the actual torque current component I _2FB fed back from the actual current calculating unit 32 and the torque current component I _2, the actual rotor The frequency control unit 33 that calculates and estimates the actual speed information ω ₂ in the rotating state, the added value of the slip frequency information ω ₃ and the actual speed information ω ₂ , that is, the magnetic flux φ.
It is configured by an integrator 34 or the like that integrates the frequency information ω ₄ of 1 to obtain the magnetic flux phase angle β.

Therefore, the actual rotation information of the drive motor M is estimated based on the actual drive current and the actual drive voltage supplied to the drive motor M, and the vector of the field current component Im set by the vector control unit 26 is calculated. And the direction of the field current vector of the actual drive motor M can be matched to perform motor control with excellent responsiveness, and the motor output shaft for detecting the actual rotation information of the drive motor M can be executed. No external sensor or signal line for detecting the rotation state of is required.

By executing the motor control as described above, the drive motor M of each wire drawing device 3 is driven at substantially the same speed based on the speed command issued from the main controller 14, and the speed command is issued. Can be adjusted to any value from zero speed (stopped state) to the maximum speed V _MAX , and as shown in FIG. 6, by gradually increasing the drive speed at startup,
Even when performing a smooth start, the drive torque can exert a sufficient torque required for feeding the cable from a low speed state.

The main control unit 14 gives a control command to the input operation unit 19 for instructing the transport start or stop of each wire drawing unit 3 and each sub control unit 13, and receives information from the sub control unit 13. A communication control unit 20 that executes various controls based on the above, and a display panel 21 that displays various information are provided. As shown in FIG. 7, the display panel 21 has a plurality of display lamps 22 (an example of display means) arranged in parallel in a bar graph in a form along the cable extending direction, and the progress of the work of extending the cable C. In accordance with the above, the indicator lamp 22 is configured to illuminate and indicate to which point the tip of the cable C has progressed, and the display panel is also provided with an abnormality lamp as an abnormality notifying means that lights up when an abnormality occurs. 23 is also provided.

The speed command signal commanded from the main control device 14 is given as an analog current value via a signal line connected in series to each sub control device 13. Compared to the case of commanding by value, malfunction due to voltage drop due to long distance transmission or malfunction due to disturbance (noise) when transmitting with digital signal such as pulse signal can be prevented, and moreover, main controller By ensuring a sufficient current capacity on the 14th side, the number of connected sub-control units 13 is not restricted.

Next, the control operation of the main controller 14 and the sub controller 13 in the cable drawing work will be described. Cable C fed from cable drum 1
However, when the wire drawing device 3 is set to the first wire drawing device 3, the wire drawing device 3 is driven so as to reach the set speed on the basis of the activation operation on the input operation unit 19, and the cable C is drawn. The cable C is sequentially extended and guided by the guide roller 4 along the set route. At this time, the output of the frequency controller 33 in the motor controller 15 is communicated to the main controller 14 as the actual rotation information of the drive motor M (cable transport amount information), and the cable moving speed is determined based on this information. The position of the cable tip is predicted from the calculated result and the installation interval information of the wire drawing device 3 which is obtained in advance, and the predicted position is displayed on the display lamp 22 of the display panel 21.

After that, when it is determined from the prediction information that the tip of the cable C has approached the second wire drawing device 3, the drive motor M in the second wire drawing device 3 is started to reach the set speed. Let At this time, when the cable C enters the wire drawing apparatus 3 and the wire drawing work is started, it is determined whether or not the cable C is present based on the detection information of the current detection unit 30. That is, as shown in FIG. 8, once the current value I exceeds the set reference value I _R , the detection signal of the cable presence / absence determining unit 18 switches from OFF (cable non-existing state) to ON (cable existing state). After that, the ON state is maintained even if the current value I fluctuates. In this way, the presence or absence of the cable C is detected based on the current value of the drive motor M, so that a simple configuration can be used without providing an external sensor or signal line dedicated to detecting the presence or absence of the cable. You can do it.

This detection signal is communicated to the main control device 14 and the display panel 21 displays that the cable has reached the wire drawing device 3. If the arrival at the wire drawing device 3 is not detected at the predetermined timing determined from the prediction information, the abnormality lamp 23 is turned on to notify the abnormality, and the driving of all the drive motors M is stopped. .

Then, after the arrival at the wire drawing device 3 is detected, the cable tip position is estimated to be the next extension from the predicted information of the cable tip position based on the cable moving speed and the installation interval information. When approaching the line device 3, the main control device 14 activates the drive motor M in the next wire extension device 3 so as to reach the set speed, performs the cable presence / absence determination based on the current value as described above, and detects the detection signal. Is communicated to the main control device 14, and the fact that the cable C has reached the wire drawing device 3 is displayed on the display panel 21. Based on the cable presence / absence determination information and the prediction information, at a predetermined timing determined by whether or not the time required for the tip of the cable C to reach the next wire drawing device 3 from the previous wire drawing device 3 elapses, If the arrival at the wire drawing device 3 is not detected, the abnormality lamp 23 is turned on to notify the abnormality and the driving of all the drive motors M is stopped.

In this way, the operator who manages the main control device 14 can visually check the progress status of the wire drawing work of the cable C by the contents displayed on the display panel 21 at any time and at the same time each wire drawing. The device 3 can be controlled and managed, and the wire drawing work can be performed almost automatically. As a result, in the cable extension work area in the tunnel,
Since it is not necessary to arrange workers, it is possible to save labor and work efficiency is significantly improved.

[Other Embodiments] (1) In the above embodiment, the drive motors M are controlled so as to be activated when the tip of the cable C approaches, based on the prediction information of the tip of the cable. Motor M
May be configured to be started or stopped in conjunction with the same set speed, and when the tip of the cable C approaches the wire drawing device 3, the speed of the drive motor M is temporarily reduced to a speed lower than the set speed, and the speed is reduced. When the current value becomes larger than the reference value set corresponding to the state, it may be determined that the cable C has entered, and control may be performed to restore the set speed. In this way, the cable C can smoothly enter the wire drawing device 3. (2) In the above embodiment, the drive states such as the start, stop, and speed setting of the drive motors M are controlled by the central control from the main controller 14, but the present invention is not limited to such a configuration. Alternatively, an operator may be arranged near each wire drawing device 3 to control each drive motor M based on a manual command to each sub-control device 13. (3) In the above embodiment, the tip position of the cable C is predicted and the predicted position is also displayed on the display unit 21, but it is also possible to display only the cable presence / absence state of each wire drawing device 3. . (4) In the above embodiment, the presence / absence of the cable C is detected based on the current value of the drive motor M, but instead of such a configuration, each wire drawing device 3 has an optical sensor or an ultrasonic sensor. The presence or absence of the cable C may be detected by disposing various sensors such as a non-contact type sensor such as the above, or a contact type sensor such as a limit switch. (5) In the above-described embodiment, the abnormality lamp 23 is displayed as the abnormality notifying means, but the notification may be performed by voice such as a buzzer, or both the display and the voice may be notified. Further, when an abnormality occurs, the driving of the drive motor M is stopped together with the notification operation.
The wire drawing work may be continued without stopping.
In addition to such a configuration, when the current value of the drive motor M exceeds a determination value for abnormality detection that is larger than the set reference value, the drive of the drive motor may be stopped. (6) In the above-described embodiment, as the cable transport amount information, based on the actual speed information (estimated value) in the motor control unit,
Although the cable movement amount is obtained, the actual rotation state of the drive motor M may be actually measured using a measuring device such as a tachometer, instead of such a configuration. (7) In the above embodiment, the case where the distance between the wire-drawing belts in each wire-drawing device is fixed to a set value is illustrated, but instead of such a configuration, for example, in accordance with the difference in the diameter of the cable. Alternatively, the interval between the wire drawing belts may be changed and adjusted by using a screw feeding mechanism or the like, and the adjusting means may be manually operated or may be automatically controlled by using an actuator. (8) In the above embodiment, the wire drawing work in the tunnel 2 is illustrated, but it may be used for the wire drawing work on the ground or the bridge.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a cable drawing system.

FIG. 2 is a simplified plan view of a wire drawing device.

FIG. 3 is a control block diagram.

[Figure 4] Current vector diagram

FIG. 5 is a block diagram of a motor control unit.

FIG. 6 is an operation characteristic diagram of a drive motor

FIG. 7 is a front view of a display panel.

FIG. 8 is a diagram showing changes in current value.

[Explanation of symbols]

1 Cable feeding part 3 Wire drawing device 13 Sub control part 14 Main control part 18 Cable presence / absence detection means 22 Display means 23 Abnormality notification means C Cable I Current value I _R Setting reference value

Claims (7)

[Claims] 1. A plurality of wire drawing devices (3) for carrying a cable (C) unwound from a cable unwinding part (1) and extended in a cable extending direction, along the cable extending direction. A cable extension installed at appropriate intervals and communicably connected to a main control section (14) and a plurality of sub-control sections (13) for individually controlling the operation of each of the wire drawing devices (3). A wire system, wherein each of the wire drawing devices (3) is provided with cable presence / absence detection means (18) for detecting whether or not the cable (C) is present, and the plurality of sub-control units Each of (13) provides the cable presence / absence information of the cable presence / absence detecting means (18) for the wire drawing device (3) managed by itself, to the main control unit (1).
4), the main control unit (14) is configured to communicate with each sub control unit (1).
The cable drawing system configured to display the cable existence state of each of the wire drawing devices (3) on the display means (22) based on the cable existence information transmitted from 3). 2. The sub-control unit (13), together with the cable presence / absence detection information, provides the main control unit (1) with information on the amount of cable transportation of the wire drawing device (3) managed by itself.
4), the main control unit (14), based on the cable presence / absence detection information, the cable transport amount information, and the installation interval information of the wire drawing device (3), (C)
Of the cable (C) conveyed from the wire drawing device (3) which has started to convey the next wire drawing device (3) is predicted to reach the next wire drawing device (3). The system for activating an abnormality notifying means (23) when the presence of a cable for the device (3) is not detected, and it is determined that an abnormal state has occurred.
Cable extension system described. 3. The main control unit (14) is configured to issue a stop command to each of the plurality of sub control units (13) in accordance with the determination of the occurrence of the abnormal state. The cable drawing system according to claim 1 or 2. 4. The main controller (14) conveys the cable (C) based on the cable presence / absence detection information, the cable conveyance amount information, and the installation interval information of the wire drawing device (3). So that the tip position of the cable (C) between the wire drawing device (3) that started the process and the next wire drawing device (3) is predicted and the predicted position is displayed on the display means (22). The cable drawing system according to claim 2 or 3, which is constructed. 5. The main control unit (14) is configured such that the predicted tip position of the cable (C) is the next wire drawing device (3).
The sub-control unit (13) that manages the wire drawing device (3) is instructed to drive the wire drawing device (3) at a set speed when it comes close to the position. The cable drawing system according to 2, 3, or 4. 6. Each of the wire drawing devices (3) is configured to be driven by an electric motor (M) for carrying a cable, and the sub-control unit (13) manages a wire-rolling device managed by itself. The electric motor (M) is configured to be driven at a set speed before the cable (C) reaches the line device (3), and the cable presence / absence detection means (18) operates the electric motor (M). current value when driving at a set speed (I) is in accordance with the increase from the set reference value (I _R), said cable (C) is configured to determine as it becomes presence state from the absence state The cable drawing system according to claim 1, 2, 3, 4 or 5. 7. The cable presence / absence detection means (18) comprises:
7. The configuration is such that a timing at which the current value (I) changes from a value smaller than the set reference value (I _R ) to a large value is detected, and the cable is present after that timing. Cable extension system described.