JP2000278833A - Cable winch tension-monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and quickly create monitoring records by processing the laying distance and tension of cables by a data processor. SOLUTION: In a monitor unit, the tension and laying distance of cables 11 are obtained according to the motor current of a driving motor 7 and a laying distance-related factor, respectively, and the obtained tension and laying distance are stored for outputting to an external data processor. A power supply unit 20 supplies power to the monitor unit and the driving motor of a cable winch, and detects the motor current of the driving motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cable winch tension monitoring device.

[0002]

2. Description of the Related Art For example, when laying an optical fiber or a synthetic resin pipe for constructing an information network or laying a power cable, excessive tension is applied to the optical fiber, the synthetic resin pipe, or the power cable (hereinafter, also simply referred to as cables). If this occurs, cables may be damaged and damaged. Therefore, to prevent damage and breakage of cables,
It is required to control the tension of cables during laying work.

FIG. 2 shows a configuration of a conventional cable winch capable of controlling tension. In the figure, 126 is a cable winch, 113 is a pulling roller that is built in the cable winch 126 and pulls the pulling rope 110 of the optical fiber 111, 107 is a driving motor that drives the pulling roller 113, and 104 is an operation that controls the operation of the driving motor 107. A motor control unit 101 for driving the motor 107
Current transformer (hereinafter simply referred to as CT)
103) is a tension calculation unit for obtaining a tension from the output signal of the CT 101, and 106 is a tension calculation unit 1
A tension indicator for displaying the tension obtained in 03, 108
Is an upper limit tension setting device that sets the upper limit tension of the optical fiber 111, 102 is a laying distance calculation unit that calculates the laying distance of the optical fiber from the output signal of the CT 101, and 105 is a distance that displays the distance obtained by the laying distance calculation unit 102. It is a display. In addition, 112 is an optical fiber 111
It is an optical fiber protective outer tube that protects.

The cable winch 126 uses a power supply having a substantially constant voltage, such as an engine generator, as an input power supply, and receives distance calculation, tension calculation, and motor control from the input power supply.
Power is supplied to the driving motor 107 and the driving motor 107.
Also, power is supplied to the drive motor 107 and the pulling roller 113 rotates to pull the pulling rope 110, and the optical fiber 111 is laid.

At that time, the CT 101 for current detection detects the motor current flowing through the drive motor 107, and the CT 101
1 is input to the distance calculation unit 102, converted into distance data and displayed on the distance display 105, and the output signal from the CT 101 is also supplied to the tension calculation unit 103, converted into tension data, and displayed as tension. Is displayed on the display 106.

Here, the tension and the traction distance are obtained from the motor current as follows. That is, the pulling rope 11 is attached to the optical fiber 111 passing through the optical fiber protection outer tube 112.
0 is connected and the traction rope 110 is connected to the traction roller 11.
3 and the traction roller 113 is
7 to tow the tow rope 110. During the towing, the motor current of the drive motor 107 is detected by the CT 101, and the motor current is output to each arithmetic unit 102,
At 103, it is converted into tension or traction distance.

[0007] The conversion is performed as follows. First, regarding the tension, the motor current is converted into a voltage (only described as a CT signal in the figure) using a conversion table or a conversion function having characteristics as shown in FIG. 3, and the converted CT signal (V)
Is converted into tension (kgf) using a conversion table or conversion function having characteristics as shown in FIG. As for the distance, the motor current is calculated using a conversion table or a conversion function having characteristics as shown in FIG.
After that, the motor rotation speed (rpm) is converted into a traction speed (m / sec) using a conversion table or a conversion function having characteristics as shown in FIG.
c) is multiplied by the time to determine the traction distance.

When recording the tension and the traction distance,
The numerical value displayed on the tension display 106 and the distance display 105 is recorded on the recording paper by the recording person at intervals of, for example, one minute. When the tension of the optical fiber 111 exceeds the tension set by the upper limit tension setting device 8, a motor stop signal is output from the tension calculating unit 102 to the motor control unit 104 in order to prevent an excessive tension from being applied to the optical fiber 111. The drive motor 107 is stopped, thereby preventing the optical fiber 111 from being damaged or broken. The motor control unit 104 controls the start and stop of the drive motor 107. For controlling the tension, the magnitude of the tension can be switched by switching the mechanical motor gear ratio. As described above, conventionally, the tension and the distance are displayed on the cable winch 126 and monitored and recorded and managed by the operator.

[0009]

However, although the data of the tension and the distance can be monitored with the conventional cable winch, the data of the tension display 106 and the distance display 105 is manually written and recorded. One worker is always required to perform the task, and much time and effort is also required to perform data reduction after one day of work. Furthermore, since the data is handwritten data, the reliability of the quality control record at the customer is not high.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cable winch tension monitoring device which can process a distance data and a tension data by a data processing device and can create a monitoring record easily and in a short time. And

[0011]

SUMMARY OF THE INVENTION Accordingly, a cable winch tension monitoring apparatus according to the present invention is a cable winch in which a pulling roller is driven by a drive motor to pull a pulling rope connected to cables. A tension monitoring device for monitoring the tension of the cables, wherein the tension of the cables is determined from the motor current flowing through the drive motor, while the pulling distance of the pulling rollers, the rotation speed of the drive motor or the rotation speed of the pulling rollers. Obtain the cable laying distance from the above, and store the obtained cable tension and laying distance to enable output to an external data processing device, and to supply power to the monitoring unit, A power supply for detecting the motor current flowing through the drive motor, wherein power can be supplied to the drive motor of the cable winch. And Tsu bets, characterized in that it comprises traction distance of the tow rope, and distance-related factor detecting means for detecting a rotational speed of the rotational speed or the pulling roller of the drive motor.

One of the features of the present invention is that while the monitoring unit and the power supply unit are provided separately from the cable winch, the monitoring unit can store the tension and the laying distance of the cables and output them to an external data processing device. It is in the point which did. Thus, after storing distance data and tension data in real time at the cable laying site, the monitoring unit and the power supply unit are carried to the data processing device, data processing is performed, a monitoring record is created, and the distance data and tension data are stored. It can be recorded on another recording medium.

As a result, a specialized worker for recording the tension and the laying distance is not required, and the data can be easily rearranged in a short time even after one day of work. Further, since the data processing is performed by the data processing device, the reliability of the quality control record at the customer can be improved.

Further, the cable winch is very heavy and cannot be easily transported because it includes a traction roller and a drive motor due to its structure. However, the monitoring unit and the power supply unit can be constituted by electric or electronic parts, and can be compact. It is lightweight and can be easily carried to a data processing device after one day's work.

It is preferable that the power supply unit and the monitoring unit are configured to be easily carried. That is, it is preferable that the power supply unit has an outlet to which a power input connector of the cable winch can be connected, and the power supply unit and the monitoring unit are portable separately from the cable winch.

It is important that the monitoring unit and the power supply unit can realize the above functions. Specifically, the power supply unit includes motor current detection means for detecting a motor current flowing to the drive motor, while the monitoring unit performs a tension calculation for obtaining a tension of cables from an output signal of the motor current detection means. Means, a laying distance calculating means for obtaining the laying distance of the cables from the output signal of the distance-related factor detecting means, receiving the output signals of the tension calculating means and the laying distance calculating means, and storing the tension and the laying distance of the cables. And a data output unit for outputting data stored in the storage unit to an external data processing device.

The motor current detecting means only needs to detect the current flowing through the drive motor. For example, a current transformer can be employed, but other detecting means can be used. Further, the tension calculating means and the laying distance calculating means may be constituted by a hardware circuit, and may be realized by CPU processing based on a program.

Further, it is preferable that the drive motor can be stopped when an excessive tension acts on the cables. Therefore, the power supply unit further includes a cutoff unit that cuts off the supply of power, while the monitoring unit includes an upper limit tension setting unit that sets an upper limit tension of the cables, and an upper limit tension setting unit that sets the upper limit tension of the cables to the upper limit. It is preferable to further include motor stopping means for controlling the shutoff means when the tension is reached to stop the supply of power to the drive motor.

It is desirable that an operator can arbitrarily check the tension and the laying distance at a cable laying site. Therefore, it is preferable that the monitoring unit further includes a printer that receives the output signals of the tension calculating means and the distance calculating means and prints the tension of the cables and the laying distance on the paper.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to specific examples shown in the drawings. FIG. 1 shows a preferred embodiment of the cable winch tension monitoring device according to the present invention. The cable winch tension monitoring device of the present embodiment includes a CT box (power supply unit) 20, a cable winch 26, and a tension recording unit (monitoring unit) 25.

The CT box 20 has a CT for detecting current.
1. Power ON / OFF relay 21 and outlet 2
2, the cable winch 26 is provided with the traction roller 9, its drive motor 7 and the motor control unit 4.

The tension recording unit 25 has a tension calculation unit (tension calculation means) 3, an upper limit tension setting device (upper limit tension setting means) 8, and a distance calculation unit (laying distance calculation means).
13, a power stop unit (power stop means) 14, a memory unit (storage means) 15, a memory changeover switch 16,
Interfaces (data output means) 17 and 18 and a printer 19 are provided.

The pulling roller 9 has a rotation detecting sensor (distance-related factor detecting means) 24 for detecting the number of rotations thereof.
The tow rope 10 is provided with a distance detecting roller (distance-related factor detecting means) 23 for detecting the moving amount, and the distance detecting roller 23 is provided with a distance detecting sensor (distance detecting sensor) for detecting a distance from the number of rotations. Related factor detecting means) 25
Is provided.

The optical cable 11 is an optical fiber protective outer tube 1.
2, the leading end thereof is connected to a tow rope 10, and the tow rope 10 is wound around the tow roller 9 of the cable winch 26. The tow rope 10 is towed by the rotation of the tow roller 9, and the optical fiber 11 Is laid. The pulling roller 9 is driven to rotate by a drive motor 7, and the drive motor 7 is started and stopped by a motor control unit 4. As for the control of the tension, the magnitude of the tension can be switched by switching the mechanical motor gear ratio.

The rotation of the pulling roller 9 in the cable winch 26 is detected as a rotation pulse signal by the rotation detecting sensor 24, and the distance detecting roller 23 provided outside the cable winch 26 rotates according to the movement of the pulling rope 10. Then, this is detected by the rotation detection sensor 24 as a rotation pulse signal. These rotation pulse signals are input to the distance calculation unit 13 and are converted into distance data.

On the other hand, with respect to the tension data, the total current of the motor current of the drive motor 7 and the current supplied to the motor control unit 4 is detected by the current detection CT 1 in the CT box 20. Here, the power consumption of the motor control unit 4 is 1/10 of the power consumption when the drive motor 7 is pulled.
It is very small and can be considered to be almost constant power consumption regardless of the motor load. Therefore, the current detection C
By subtracting the current consumption of the motor control unit 4 from the current value detected at T1, the drive current value of the drive motor 7 can be obtained. This calculation is performed by the tension calculation unit 3, and the calculated current value is converted into tension data in the tension calculation unit 3.

The distance data obtained by the distance calculation unit 13 and the tension data obtained by the tension calculation unit 3 are stored in the storage areas M1 to M4 in the memory unit 15 specified by the memory switch SW16.

The obtained distance data and tension data are input to a printer 19 via an interface 18 and can be printed out in real time.

On the other hand, the distance data and tension data stored in the memory unit 15 can be arbitrarily taken out through the interface 17. Therefore, the distance data and the tension data can be read out to an external data processing device, for example, a personal computer, and more advanced data editing can be performed, and a report of the tension record can be created.
Data management can be performed using a recording medium such as a hard disk or a floppy.

Further, the upper limit of the tension can be set by the upper limit tension setting device 8. When the tension of the optical fiber 11 exceeds the upper limit, an over tension is detected in the tension calculating unit 3 and a tension over signal is output from the power supply. Output to the stop unit 14, the power ON / OFF relay 21 is OFF
As a result, the supply of power to the cable winch 26 is immediately interrupted, and the cable winch 26 is stopped to prevent damage to the optical cable due to abnormal tension.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a preferred embodiment of a cable winch tension monitoring device according to the present invention.

FIG. 2 is a configuration diagram showing a conventional cable winch having a tension display function and a distance display function.

FIG. 3 is a characteristic diagram for obtaining a CT signal from a motor current.

FIG. 4 is a characteristic diagram for obtaining tension from a CT signal.

FIG. 5 is a characteristic diagram for obtaining a motor rotation speed from a motor current.

FIG. 6 is a characteristic diagram for obtaining a traction speed from a motor speed.

[Explanation of symbols]

 Reference Signs List 1 CT for current detection (motor current detecting means) 3 Tension calculating unit (tensile calculating means) 4 Motor control unit 7 Drive motor 9 Pulling roller 10 Pulling rope 11 Optical fiber (cables) 13 Distance calculating unit (Laying distance calculating means) 14 Power stop unit (power stop unit) 15 Memory unit (storage unit) 17 Interface (data output unit) 18 Printer interface 19 Printer 20 CT box (power unit) 21 Power ON / OFF relay (cutoff unit) 22 Outlet 23 Distance detecting roller (Distance-related factor detecting means) 24 Rotation detecting sensor (distance-related factor detecting means) 25 Tension recording unit 26 Cable winch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F068 AA12 AA13 BA00 CA00 DA03 EA01 GA12 JB01

Claims (5)

[Claims] 1. A tension monitoring device for monitoring the tension of cables in a cable winch in which a pulling roller is driven by a drive motor to pull a pulling rope connected to the cables. While the tension of the cables is obtained from the flowing motor current, the laying distance of the cables is obtained from the pulling distance of the pulling roller, the number of rotations of the drive motor or the number of rotations of the pulling roller, and the obtained tension of the cables is obtained. And a monitoring unit capable of storing the laying distance and outputting the data to an external data processing device; and supplying power to the monitoring unit, and supplying power to the drive motor of the cable winch. A power supply unit for detecting a flowing motor current, a traction distance of the traction rope, a rotation speed of the drive motor, or A cable winch tension monitoring device, comprising: a distance-related factor detecting means for detecting the number of rotations of a pulling roller. 2. The power supply unit includes motor current detection means for detecting a motor current flowing to the drive motor, while the monitoring unit calculates a tension of cables from an output signal of the motor current detection means. Means, a laying distance calculating means for obtaining the laying distance of the cables from the output signal of the distance-related factor detecting means, receiving the output signals of the tension calculating means and the laying distance calculating means, and storing the tension and the laying distance of the cables. 2. The cable winch tension monitoring device according to claim 1, further comprising: storage means for performing the operation, and data output means for outputting data stored in the storage means to an external data processing device. 3. The power supply unit further includes a cut-off means for cutting off the supply of power, while the monitoring unit sets an upper-limit tension setting means for setting the upper-limit tension of the cables, and the tension of the obtained cables and the like. 3. The cable winch tension monitoring device according to claim 2, further comprising: motor stopping means for controlling the shutoff means to stop the supply of power to the drive motor when the tension reaches the upper limit tension. 4. A cable winch according to claim 2, wherein said monitoring unit further comprises a printer which receives output signals of said tension calculating means and distance calculating means and prints the tension of cables and the laying distance on paper. Tension monitoring device. 5. The power supply unit has an outlet to which a power input connector of the cable winch can be connected, and the power supply unit and the monitoring unit are portable separately from the cable winch. 5. The cable winch tension monitoring device according to any one of claims 4 to 4.