JPH11215634A - Cable delivering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable delivering apparatus which generates a strong and sure cable-tracking force, by a light and simple structure when using it in a cable laying work, and especially, generates a stable cable-tracking force at a high cable-delivering speed when laying a longthy cable with large-diametric conductors in a long-distance line, and further, deals with the wide range of cable-delivering speed. SOLUTION: In a cable delivering apparatus of the mode of tracking a cable 11 by putting it on rotating rollers 3a, 3b, the two or more rollers 3a, 3b are provided on a common base portion 1 along the delivered cable 11 to drive them with a single constant-torque motor 2 driven by an inverter. Further, a tightener having an endless belt 6 tensed between a pair of rotating wheels 7a, 7b is coupled to the base 1 by coupling rods swingably and oppositely to the rotating rollers 3a, 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable feeding device used for laying cables.

[0002]

2. Description of the Related Art In recent years, as the length of laid lines of ultra-high-voltage large-conductor cables and the length of cable entry spans have been increased, the efficiency of drawing long cables into caves has been improved. Shortening and cost reduction are strongly desired.

A conventional cable feeder used for laying power cables, for example, is disclosed in
As disclosed in JP-A-83917, a cable to be fed is mounted, and is constituted by one rotating roller for transmitting a traction force to the cable by friction, and a motor for driving the rotating roller. By driving the rotating roller at an arbitrary speed by a motor, a pulling force is applied to the cable, and a feeding operation is performed.

A cable feeder using such a roller has advantages that it has a simple structure, is light in weight and inexpensive, and is easy to install and remove during cable laying work. In laying long cables, it is effective to use a number of relatively small cable feeders for dispersing the cable pulling force, but a cable feeder using rollers is suitable for this need. .

[0005] However, the above-mentioned cable feeding device composed of one rotating roller has a disadvantage that the traction force to the cable is not reliably transmitted. That is, the traction force is transmitted to the cable by the contact surface pressure between the cable and the rotating roller caused by the weight of the cable. However, fine vibrations are constantly generated in the cable during feeding. Since the upwardly-accelerated acceleration is constantly applied to the delivered cable by vibrations, the contact surface pressure is momentarily reduced, and a slip occurs between the rotating roller and the cable. Also, slight warpage, warping, and unevenness of the surface of the cable may cause a reduction in slip.

[0006] In the conventional example, even if the device can obtain a traction force of 50 kgf by design, the traction force that can be constantly generated in actual work at a traction speed of 5 m / min is 30 kgf.
Had fallen. Further, when the cable sending speed is increased or when a metal corrugated cable whose outer skin is processed into a wavy shape is sent out, the vibration becomes more intense and slips are likely to occur. In addition, there has been a problem that the slip leaves traces of friction on the cable sheath and impairs the appearance.

[0007] In order to solve these problems, there has been a structure in which a pressing roller is provided on a rotating roller, and a cable is sandwiched between upper and lower rollers. In such a case, the transmission of the traction force to the cable can be improved reliably.However, since the pressing force is concentrated on the narrow area where the cable and the roller are in contact with each other, there is a disadvantage that the cable is easily damaged. Was.

As a conventional example capable of generating a larger traction force, for example, Japanese Utility Model Application Laid-Open No.
There is one that transmits tractive force to a cable using an endless track, such as that described in Japanese Patent No. 3220. The cable feeder in this example has an endless track in which an endless belt is stretched between a driving wheel and a driven wheel, and a tightener is provided opposite to the endless track. This tightener has a structure in which an endless belt is stretched between a pair of rotating wheels arranged in a horizontal direction. The endless track and the tighter are connected to each other by a connecting rod at a substantially central portion thereof, so that the tighter can swing right and left around a fulcrum provided on the endless track side. When sending out the cable, the tightener arranged at the top of the endless track swings following the cable sending direction. Since the endless belt of the tighter is in contact with the outer periphery of the cable, the belt is rotated as the cable advances, and a tensile force acts in the cable sending direction, so that the entire tighter swings around the fulcrum. Accordingly, an appropriate gripping force is applied to the cable following the progress of the cable, and smooth feeding can be performed. With this device, the traction force can be reliably transmitted to the cable, and a traction force of 200 kgf is obtained in the actual feeding operation.

However, this device has a complicated structure and a weight of 5
Since it is heavy, that is, 0 kg or more, there are disadvantages in that the burden on the operator at the time of installation is large, and it takes time to perform the installation and removal work. In addition, because each one is large and expensive,
However, it has not sufficiently satisfied the needs of a long cable laying operation to use a number of relatively small cable feeding devices.

[0010] Further, in view of the recent lengthening of cable laying lines, there is a demand for an apparatus suitable for speeding up cable feeding work. In addition, in the construction of such a long-distance line, a variety of feeders having different speeds are mixed in one laid line because, for example, different contractors share the line and perform the construction. There is a demand for a device that can handle the feeding speed.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a cable feeding device used for cable laying work as described above, which generates a strong and reliable cable pulling force with a lightweight and simple structure, and particularly for a long-distance line. An object of the present invention is to generate a stable cable pulling force at a high cable feed speed and to cope with a wide range of the feed speed in laying a long large conductor cable.

[0012]

In a cable feeding device of a type in which a cable is placed on a rotating roller and pulled,
Two or more rotating rollers are arranged on a common base along a cable to be sent, and the two or more rotating rollers are driven by a single motor. (Claim 1) Thereby, the transmission of the traction force to the cable is ensured, and the steady traction force in the actual cable traction operation is increased. As described above, in the conventional method using a single rotating roller, the surface pressure between the cable and the roller is instantaneously and intermittently reduced due to vibration or the like generated in the cable during feeding, and is transmitted to the cable. Traction was momentarily reduced. On the other hand, in the present invention, by using two or more rotating rollers, even if instantaneous reduction in transmission of traction occurs in one roller, transmission of traction is continued by the remaining rollers, and the cable feeding device is used. As a whole, there is a constantly stable transmission of traction. The present invention is particularly suitable for high-speed cable pulling because the influence of vibration and the like is greater when the cable pulling speed is high.

Further, since two or more rotating rollers are driven by a single motor, the problem of leaving a trace of friction on the cable appearance due to slippage between the rotating roller and the cable can be reduced. That is, in the conventional one in which one rotating roller is driven by one motor, when the transmission of the traction force to the cable is reduced due to a decrease in surface pressure due to vibration or the like, the rotation speed of the motor increases due to a decrease in load. , The rotating roller slips. Slip friction heat is generated between the cable and the rotating roller, leaving traces of friction on the cable appearance. However, in the present invention, since two or more rotating rollers are driven by a single motor, if any of the rotating rollers is transmitting the traction force to the cable, the rotation speed due to a decrease in the load on the motor is reduced. No rise occurs, and there is no danger of leaving traces of friction on the cable surface due to slippage of the rotating roller.

In the present invention, two or more rotating rollers are disposed on a common base along a cable to be sent out, and each of the two or more rotating rollers is driven by a single motor, and a pair of rotating rollers is provided. A tighter having an endless belt stretched between rotating wheels can be swingably opposed to the rotating roller and connected to the base using a connecting rod. (Claim 2) In the conventional cable feeding device using one rotating roller, the enhancement of the traction force transmission to the cable using the above-described swingably connected tighter has not been effective. This is because, when the tensioner is installed so as to be capable of swinging so as to face one rotating roller, the swinging of the tighter does not act as a force for gripping the cable, but acts as a force for bending the cable sending direction downward. In the present invention, since two or more rotating rollers are used, the cable feeding direction is secured horizontally. Therefore, even when a swingable tightener is used, the cable feeding direction is not bent downward, and the original function of the tightener can be exhibited.

Further, it is desirable to use a constant torque motor for driving the inverter, which is driven at a variable speed and a constant torque by an inverter, as the motor for driving the rotating roller. (Claim 3) In a conventional cable feeding device using a rotating roller,
General-purpose squirrel-cage induction motors have been used as drive motors. The general-purpose cage induction motor has the output characteristics shown in FIG. 5, and the output torque of the motor changes as the rotation frequency of the motor changes by changing the output frequency of the inverter. On the other hand, a constant torque motor for driving an inverter is driven by a dedicated inverter having a voltage boost function or the like for compensating for a voltage drop in a low frequency range, so that a range of rotation speed as shown in the output characteristic shown in FIG. Generates a constant output torque.

As described above, the present invention has a feature that by including two or more rotating rollers driven by a single motor, the traction force can be reliably transmitted even in cable traction at a high speed. Using a constant torque motor for inverter drive as described above, a constant traction force can be applied to the cable in a wide speed range from a low traction speed to a high traction speed. The traction force does not decrease as in the case of using the cage type induction motor. As a result, a constant traction force is always generated even when different types of delivery devices are mixed in the construction of long-distance cable lines and the delivery work is performed by changing the cable delivery speed according to the speed and work content of other delivery devices. can do.

[0017] This eliminates the need to increase or decrease the number of delivery devices according to the towing speed and to perform rearrangement work, etc., which are conventionally performed. Lightweight and simple features, which are the original features of the delivery device using rotating rollers, are eliminated. In addition to the point, facilitation of simultaneous work with other feeding devices in laying long cables,
This has a particularly large effect on labor saving and rationalization of installation, operation, and removal work in a cave.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[0019]

An embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a plan view and a side view of an embodiment of a cable feeding device without a tightener. A constant torque motor 2 for driving one inverter (trade name: AF manufactured by Sumitomo Heavy Industries, Ltd.) is provided on a base 1 of the cable feeding device.
Motor, CNHM02-5085-AV-35), and the rotating shafts 4a, 4b are positioned so that the two rotating rollers 3a, 3b are parallel to each other with the inverter driving constant torque motor 2 therebetween. Attached through. A drive sprocket 5 is attached to the constant torque motor 2 for driving the inverter, and a drive chain 6
Are connected to the driven sprockets 7a, 7b attached to the rotating rollers 3a, 3b through the shaft. Non-slip rubber 8a is provided on the outer periphery of the rotating rollers 3a and 3b.
8b are attached, and four corners of the base 1 are
Guide rollers 9a, 9b, 9c, 9d
It is rotatably mounted via a, 10b, 10c, and 10d. On the rotating rollers 3a and 3b, a cable 11 to be sent out indicated by a dotted line is placed.

The constant torque motor 2 for driving the inverter
Is driven by an inverter (not shown) in a variable rotation direction and speed, and its power is transmitted to the rotation rollers 3a, 3b via the drive sprocket 5, the drive chain 6, and the driven sprockets 7a, 7b, and the rotation rollers 3a, 3b is driven in a variable rotation direction and speed. The rotational force of the rotating rollers 3a and 3b is transmitted to the cable 11 via the non-slip rubbers 8a and 8b, and pulls and sends out the cable 11.

In this embodiment, a cable having a maximum diameter of 170 mm can be sent out, and a maximum traction speed of 20 m / m is required.
Min, a device weight of 25 kg and a traction force of 70 kgf were obtained. In addition, because it has a structure that obtains a stable traction force without using a tighter or holding roller, it is not necessary to pass the cable end through the tighter or holding roller during cable laying work. Work became easier and faster.

FIG. 3 shows an embodiment in which a tighter in which an endless belt is stretched is provided between a pair of rotating wheels.

In the present embodiment, in the cable feeder of the above-described embodiment, a tighter 12 disposed opposite to the upper portions of two rotating rollers 3a and 3b and a connecting rod 13 for swingably connecting the tighter 12 to the base 1. It is provided with. In the tighter 12, an endless belt 15 is stretched between a pair of rotating wheels 14a and 14b. The base 1 and the tighter 1
2 are connected to each other by a pair of connecting rods 13 at substantially both sides of the center thereof, and a fulcrum 1 provided on the base 1
The tighter 12 is assembled so as to be able to swing right and left in FIG.

The rotating rollers 3a and 3b are driven by a constant torque motor (not shown) for driving an inverter so that the rotating direction and the speed are variable. The rotational force of the rotating rollers 3a and 3b is transmitted to the cable via the anti-slip rubbers 8a and 8b, and pulls and sends the cable. At this time, the tighter 12 disposed opposite to the upper portions of the two rotating rollers 3a and 3b swings following the cable feeding direction.
That is, since the endless belt 15 of the tighter 12 is in contact with the outer periphery of the cable, it is rotated as the cable progresses, and a tensile force acts in the cable sending direction, so that the entire tightener 12 swings around the fulcrum 16. become. Accordingly, an appropriate gripping force is applied to the cable following the progress of the cable, and smooth feeding is possible, and transmission of the traction force is possible.

In the example of this embodiment, the maximum diameter of the cable which can be sent out is 170 mm and the maximum traction speed is 20 m / m.
The characteristics of the device weight of 35 kg and the traction force of 150 kgf were obtained. The cable feeder using a rotating roller is provided with a tightener so that it can be sent out using an endless track without impairing the advantages of the device using a rotating roller, which is compact, lightweight, simple and easy to install by human power. A strong traction force comparable to the device could be generated.

FIG. 4 shows an embodiment in which the cable feeding device according to the present invention is applied to the construction of a long ultra-high voltage cable in a long-distance line in which different types of cable feeding devices having different feeding speeds are mixed.

Cable 32 wound around body-length drum 31
Is sent into a passageway 33 provided in the ground 30. In the section indicated by A in the drawing of the inside of the cave 33, conventional cable feeders 34 of a type using a tightener in an endless track are arranged at intervals of 350 m, and the present invention is provided between the conventional feeders 34. Are arranged at 50 m intervals using two rotary rollers. Further, between the above-mentioned conventional delivery device 34 and the above-mentioned delivery device 35 according to the present invention, free rollers 36 having no power are arranged at intervals of 3 m. The delivery device 34 and the delivery device 35 are connected to an operation panel (not shown) and an inverter power supply, and the operation is controlled collectively. A traction force is applied to the cable 32 by the delivery device 34 and the delivery device 35, and the cable 32 is towed and laid in the cave 33.

In this embodiment, the cable laying distance is, for example, 4000 m, and the cable feeding speed can be increased to 20 m / min. The towing speed and workability have been improved compared to the past, and the construction period has been significantly shortened.

In the section indicated by B in the figure of the above-mentioned passageway 33, a conventional cable feeder 37 of the type using one rotating roller is arranged on the same cable extension line by another contractor. Have been. The rated delivery speed of the cable delivery device 37 is 5 m / min. When the end of the cable 32 approaches the section B,
Since the cables 32 are connected on the cable extension line, it is necessary to reduce the cable feeding speed in the section A to match the speed in the section B. Therefore, the feeding speed was reduced to 5 m / min in the section A, and the cable was fed simultaneously with the section B. Even in this case,
In the cable feeder 35 according to the present invention in the section A, the constant torque motor driven by the inverter is used, so that a constant traction force can be applied to the cable regardless of a change in speed. Therefore, there is no decrease or fluctuation in the traction force due to the decrease in the delivery speed, which is a concern in the delivery device using the conventional cage induction motor, and the suspension of the traction or the unstable speed does not occur. Delivery work was possible. In addition, there was no need to add or relocate the feeding device, which was conventionally performed.

FIG. 4 shows a case where the section A to which the cable sending device according to the present invention is applied is located on the upstream side in the cable sending direction with respect to the section B using the sending machine having a different sending speed. However, on the contrary, when the section A using the cable delivery device according to the present invention is located on the downstream side in the delivery direction with respect to other sections,
Alternatively, a case may occur where the section A is located between other sections. Even in these cases, the cable delivery device according to the present invention can apply a constant traction force to the cable regardless of a change in the delivery speed, so that the delivery operation can be performed according to the speed of another section. , And the same effect as in FIG.

[0032]

As described above, the cable feeder of the present invention has two or more rotating rollers driven by a single motor, and is provided with a tightener if necessary. A reliable cable traction force can be generated. This facilitates installation and operation of the device in the tunnel, and enables reliable cable pulling even at a high cable feeding speed. In addition, since it is possible to generate a constant traction force in a wide range of delivery speeds, when laying a long ultra-high voltage cable in a long-distance line in which other cable delivery devices having different delivery speeds are mixed, another delivery device is used. It becomes easy to carry out the sending operation in accordance with the speed of.

[Brief description of the drawings]

FIG. 1 is a plan view of a cable feeding device.

FIG. 2 is a side view of the cable feeding device.

FIG. 3 is a side view of a cable delivery device provided with a tighter.

FIG. 4 is an explanatory view of an embodiment of the laying work using the cable feeding device.

FIG. 5 is a diagram showing output characteristics of a general-purpose cage type motor.

FIG. 6 is a diagram showing output characteristics of a constant torque motor for driving an inverter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base part 2 Constant torque motor for inverter drive 3a, 3b Rotary roller 6 Drive chain 11 Cable 12 Tightener 13 Connecting rod 31 Trunk drum 33 Cave 35 Cable feeder

Claims (3)

[Claims] 1. A cable feeder comprising: a rotary roller for transmitting a traction force to a mounted cable to be fed by friction by friction; a motor for driving the rotary roller; and a base on which the rotary roller and the motor are disposed. A cable feeding device, wherein two or more rotating rollers driven by a single motor are arranged on the base along a cable to be fed. 2. A cable feeder comprising: a rotary roller for transmitting a traction force to a mounted cable to be fed by friction by friction; a motor for driving the rotary roller; and a base on which the rotary roller and the motor are disposed. A plurality of the rotating rollers driven by a single motor are disposed on the base along the cable to be sent out, and a tightner in which an endless belt is stretched between a pair of rotating wheels; A cable feeder, comprising: a connecting rod that is swingably connected to the base in opposition to the rotating roller. 3. The cable feeding device according to claim 1, wherein said motor is a constant torque motor for driving an inverter driven by an inverter at a variable speed and a constant torque.