JPH0439622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a self-propelled rust detection device capable of detecting the state of rust on overhead wires on the ground.

[Technical Background of the Invention] The degree to which rust occurs in bare or insulated power transmission lines and distribution lines varies depending on the usage conditions and period of use.

Bare overhead wires can be inspected to some extent by looking at the degree of rust, but it is impossible to inspect covered wires by looking at them due to the presence of the covering, and inspection itself by looking at the wires does not allow you to check the extent to which rust has progressed. It is difficult to quantitatively understand whether the

As the rust progresses, the mechanical strength of the overhead wire decreases, increasing the risk of it being cut by strong winds.

[Problems with conventional technology] In order to quantitatively grasp the degree of occurrence of rust, for example, it is possible to measure conductivity, but there are problems with installation on overhead wires, how to process rust detection signals, and measurement accuracy. However, there are various problems in the method of determining the degree of rust occurrence, etc., and it has not yet been put into practical use.

Further, it is desirable to carry out this type of inspection while the cable is live, so that it is safe and easy to handle, and it is also necessary to eliminate the influence of the load current flowing through the cable. For this reason, the inventor of the present invention faithfully captures the detection signal corresponding to the degree of rust occurrence, transmits it using FM liquid, receives it with a receiver on the ground, determines the degree of rust occurrence, and uses it in live line conditions. We have devised a rust detection device that can detect the degree of rust on cables to be inspected without being affected by the load current.

This detection device is mechanically easy to attach to the overhead line, has a mechanism to prevent it from falling off the overhead line, and runs smoothly on the overhead line, that is, the cable to be inspected. It has the characteristic of being able to easily absorb partial variations in outer diameter.

[Problems with Background Art] However, the above rust detection device has the following problems.

(1) Since the rust detection device is not equipped with a drive source for self-propulsion, in order to run it on the cable to be inspected, tie a rope to one end of the rust detection device and connect the rope to two utility poles. The worker must tow the vehicle from either side, which requires labor and time.

(2) Because the operator tows the rust detection device, the running speed of the rust detection device is not constant, and therefore it is difficult to distinguish between non-rusted parts and rusted parts from the final signal processing chart. Difficult to judge.

(3) It is difficult to inspect the towing rope because it hangs down from the overhead wire, making it dangerous because the rope itself sways greatly when crossing a busy road or in strong winds. .

(4) It requires a towing worker in addition to the data measurement difference work, making it difficult to save labor.

(5) The contact between the rust detection coil for obtaining the rust detection signal and the cable to be inspected is unstable, making it difficult to improve detection accuracy.

[Object of the Invention] The present invention has been made based on the above-mentioned circumstances, and is a self-propelled system capable of self-propelling on a cable to be inspected without requiring a towing operator, and capable of accurately detecting the state of rust occurrence. The purpose of the present invention is to provide a shape rust detection device.

[Summary of the Invention] The present invention provides a pair of drive wheels running on a cable to be inspected, a drive motor that drives the drive wheels via a power transmission mechanism, and a drive motor disposed between the pair of drive wheels, and a drive wheel running on a cable to be inspected. A self-propelled rust detection device comprising a rust detection coil vertically disposed in contact with the top surface of a cable for obtaining a rust detection signal,
The present invention is characterized in that the drive motor is driven and stopped by remote control from the ground, and the rust detection device on the cable to be inspected can be advanced, stopped, and retreated accordingly.

[Embodiments of the Invention] The principle of the rust detection device of the present invention is to generate an eddy current on the outer surface of the cable to be inspected, detect the magnetic flux generated by this with a rust detection coil, and rectify this rust detection signal. and switching at a predetermined frequency, FM
It is modulated and transmitted by a rust detection signal device, and this transmitted FM signal is received by a rust detection signal receiver, demodulated,
The rectified rust detection signal is obtained, and the high conductivity detection area thereof is expanded to determine the degree of rust occurrence.The main part of the present invention is the mechanical part of the rust detection device. Therefore, detailed explanation will be omitted.

1 to 8 are diagrams showing a first embodiment of the rust detection device according to the present invention, and FIG. 9 is a diagram showing a second embodiment of the above device.

The first embodiment has a drive source for a drive vehicle running on a cable to be inspected, a rust detection coil is arranged vertically to ensure contact between the cable to be inspected and the rust detection coil, and It is characterized by being equipped with a pressing wheel that forcibly presses the cable to be inspected toward the rust detection coil.

That is, in FIGS. 1 to 8, the rust detection device 1 has a pair of driving wheels 2a and 2b in the horizontal direction of the device 1. As shown in FIGS.

The drive wheels 2a, 2b are fixed to drive shafts 3a, 3b supported by a frame 4.
At one end of a, 3b is a chain sprocket 5a,
5b is fixed.

A drive motor 6 is provided at the bottom of the frame 4, and a chain sprocket 8 is fixed to an output shaft 7 of the drive motor 6.

An endless chain 9 is stretched between the chain sprockets 5a, 5b of the drive wheels 2a, 2b and the chain sprocket 8 of the drive motor 6.

Therefore, the driving force of the drive motor 6 is transmitted from the chain sprocket 8 via the endless chain 9 to the chain sprockets 5a, 5b fixed to the drive shafts 3a, 3b, and the drive wheels 2a, 2b are driven at a predetermined speed. It will be driven.

Note that the drive motor 6 uses, for example, a DC geared motor, and is driven by a battery 10.

In addition, in this embodiment, the drive wheels 2a, 2b have a drive shaft 3, as is clear from the sectional view shown in FIG.
A and 3b are tapered pulleys having a taper angle θ that decreases in diameter toward one end.

Between the pair of drive wheels 2a and 2b, a rust detection coil 11 is vertically installed in the rust detection device 1 with its contact head 12 facing downward.

This rust detection coil 11 and drive wheels 2a, 2b
A cable-to-be-tested insertion part 13 is formed directly below the insertion part 13 , and a cable to be tested 17 inserted through an opening 16 formed between the upper cover 14 and the lower cover 15 is inserted into the guide plate 18 . They will be guided and placed along the

A pair of fixed wheels 19a and 19b are rotatably fixed to the frame 4 to support opposite side surfaces of the cable 17.

A pushing wheel 20 is provided at a substantially intermediate position between the fixed wheels 19a and 19b.

That is, this pressing wheel 20 has a pressing roller 21
is rotatably fixed to one end of the swing arm 22,
The other end of the swing arm 22 is swingably supported by a frame 23 (see FIG. 5) so as to form a predetermined angle with respect to a horizontal plane.

A pin 24 is inserted into the end of the swinging arm 22 directly below the pressure roller 21, and one end of tension coil springs 25, 25 is hooked to both ends of the pin 24. , the mounting bolts 2 inserted through the mounting flanges 11a, 11b of the rust detection coil 11 as shown in FIGS. 7 and 8.
It is hooked on the tip of 6.

Thus, the swing arm 22 is pulled toward the rust detection coil 11 by the tension coil springs 25, 25, and presses the cable 17 to be inspected, which is in contact with the pressing roller 21, toward the fixed wheels 19a, 19b.

In addition, the cable 17 to be inspected includes a straight sleeve 17 having an outer diameter larger than the outer diameter of the cable.
When the rust detection device 1 passes through the linear sleeve 17a, the pressing roller 21 follows the outer diameter of the sleeve 17a and is pushed backward, and the swinging arm 22 moves as shown in FIG. , the position is vertically downward as shown by the chain line in FIG.

Even in the above case, since good contact with the rust detection coil 11 is maintained, no particular abnormality occurs in the generation of the desired rust detection signal.

Next, a mechanism for preventing separation of the device 1 from the cable to be inspected 17 will be explained.

That is, in this detachment prevention device, after the cable to be inspected 17 is inserted through the opening 16 formed between the upper cover 14 and the lower cover 15, the tips 27a and 27b of the hanger 27 open the opening 16. Configured to close. To describe this in more detail, as shown in FIG. is configured so that it is always pulled downward by the tensile force of the coil spring 28.

With the above configuration, when attaching the rust detection device 1 to the cable to be inspected 17, if the worker grasps the hanging handle 27 and hangs it, the device 1 will fall downward due to its own weight and move upwards. An opening 16 is formed between the cover 14 and the lower cover 15.

Therefore, when the device 1 is mounted on the cable to be inspected 17 through the opening 16 and the hand is released from the hanger 27, the hanger 27 will be able to hold the tension coil spring 2.
It is pushed down by the tensile force of 8, and the hanging hand 2
The opening 16 is closed by the tip portions 27a and 27b of the cable 7, and serves as a separation prevention mechanism from the cable 17 to be inspected.

Note that handles 29a and 29b are fixed to both left and right ends of the rust detection device 1, and handles 29a and 29b are fixed to the left and right ends of the rust detection device 1.
It is possible to adjust the upper position and run manually.

Next, a second embodiment of the present invention will be described with reference to FIG. 9.

In this embodiment, the driving vehicle 2 in the previous embodiment is
a and 2b are V-shaped pulleys 20 having substantially V-shaped grooves in cross section;
It is characterized by setting it to 0. This V-shaped pulley 200
By using this, it is possible to maintain good contact with the rust detection coil (not shown) provided in alignment with the central axis, and even when passing over the straight sleeve 17a, it only moves in the vertical direction. This prevents the device 1 itself from shaking horizontally.

Furthermore, when the V-shaped pulley 200 is used, good contact with the rust detection coil can be maintained as described above, so the pushing wheel 200 can be
This eliminates the need to provide the device, and the configuration of the device can be simplified.

In FIG. 9, the same parts as in the first embodiment are given the same reference numerals, and detailed explanation thereof will be omitted.

[Effects of the Invention] As described above, the present invention is equipped with a drive source for self-propelled movement on the cable to be inspected, and also maintains reliable contact with the rust detection coil, thereby saving labor in rust inspection work. In addition to being able to maintain a constant running speed using the drive motor, unlike manual running of tow ropes, etc., it is possible to accurately determine non-rusted and rusted areas from the final chart, improving inspection accuracy. can be done. Furthermore, there is no need for a tow rope to run the rust detection device, so inspection work can be carried out without any problems even when crossing roads with heavy traffic, and it can also be easily blown away by strong winds. This has the effect of making it possible to avoid the dangers of Furthermore, since the device of the present invention is provided with a means for closing the opening for inserting the cable to be inspected in conjunction with the hanging hand that lifts the device, that is, the gripping member, after the device is attached to the cable to be inspected, In this case, the opening is closed and the device does not come off the cable during rust detection.

[Brief explanation of drawings]

1 to 8 show a first embodiment of the rust detection device according to the present invention, FIG. 1 is a front view showing the whole, FIG. 2 is a side view showing the whole, 3 is a partially cutaway front view, FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3, FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 3, and FIG. 3 is a partially cutaway view taken along the line C-C, FIGS. 7 and 8 are a partially cutaway front view and side view showing the mounting means of the push wheel, and FIG. 9 is a partially cutaway view taken along line C-C of FIG. FIG. 2 is a partially cutaway side view of a rust detection device showing a second embodiment. 1... Rust detection device, 2a, 2b... Drive vehicle, 3
a, 3b...drive shaft, 4...frame, 5a, 5
b...Chain sprocket, 6...Drive motor, 7...Output shaft, 8...Chain sprocket, 9...Endless chain, 10...Battery,
11...Rust detection coil, 12...Contact head, 13
... Cable insertion part to be inspected, 14 ... Upper cover, 15 ... Lower cover, 16 ... Opening, 17
... Cable to be inspected, 17a ... Straight sleeve,
18... Guide plate, 19a, 19b... Fixed vehicle,
20... Pressing wheel, 21... Pressing roller, 22...
Swing arm, 23... frame, 24... pin,
25... Tension coil spring, 26... Mounting bolt, 27... Hanging hand, 28... Tension coil spring,
29a, 29b...handle, 200...V-shaped pulley.

Claims (1)

[Scope of Claims] 1. A pair of drive wheels running on the cable to be inspected, a drive motor that drives the drive wheels via a power transmission mechanism, and a surface of the cable to be inspected between the pair of drive wheels. a rust detection coil for obtaining a rust detection signal disposed so as to be in contact with the rust detection coil; and a cover member provided to cover the pair of drive wheels, the power transmission mechanism, the drive motor, the rust detection coil, etc. In the self-propelled rust detection device, an opening through which the cable to be inspected is inserted is formed in a side surface of the cover member, a closing member closing at least a portion of the opening, and a gripping member for gripping the device. A self-propelled rust detection device characterized in that the gripping member and the closing member are interlocked with each other. 2. A rotatable fixed wheel disposed on the side surface of the cable to be inspected in the cover and supporting the cable to be inspected; The self-propelled rust detection device according to claim 1, further comprising a rotatable pressing wheel that presses the cable to be inspected with a predetermined pressure.