JPH0710302Y2 - Signal cable insulation failure detection device - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is designed to prevent leakage from a signal cable by simply inserting a forked detection rod into the soil near the signal cable laid along the track of a train. The present invention relates to a device capable of detecting the presence / absence of a signal and a leak location.

[Conventional technology]

Normally, in railways, etc., a trough (concrete groove) is provided along the track, and a signal cable is laid in the trough, and the train command station gives instructions to the running train through this signal cable, and other Information is exchanged, and a predetermined signal is displayed on a traffic light beside the track. Therefore, the role of the signal cable is important for train operation,
From a fool-safe perspective, its function should not be impaired. Therefore, in practice, maintenance inspections are regularly performed to search for defective insulation of signal cables.

Thus, in the conventional maintenance and inspection of signal cables, first, weeds growing on the soil around the upper edge of the trough lid on which the signal cable is laid are removed, the lids are sequentially flipped one by one, and the trough is visually inspected. I was searching for a defective insulation part of the signal cable inside.

There is also a signal cable that is buried directly in the soil beside the track.In this case, weeds are removed or soil is dug up to expose the signal cable, and after visual maintenance and repair, it is buried. I try to put it back.

[Problems to be solved by the device]

As described above, in the method of laying a signal cable in the trough and visually searching for a defective insulation part, complicated work such as removing weeds and turning the lid must be performed over the entire length of the trough. However, there is a drawback in that the worker is severely burdened in the summer and winter. Moreover, after repairing the defective insulation portion, mortar had to be packed between the lid and the trough body as a measure against the rat, and the workability was extremely poor.

For the signal cable buried in the soil beside the track, weeds must be removed, dug up, and backfilled over the entire length of the signal cable.
This was also a very complicated task.

[Means for Solving the Problems]

SUMMARY OF THE INVENTION The present invention has been made to improve the above-mentioned problems in view of the above-mentioned problems, and can detect a defective insulation portion by simply inserting a forked detection rod into the soil. It is intended to provide a device.

The characteristics of the signal cable insulation defect detection device adopted by the present invention to solve the above problems are as follows.
A support plate is vertically fixed to the tip of a lightweight elongated operating rod, and two detection rods are detachably attached to the supporting plate in a bifurcated manner with an appropriate interval and parallel to the axis of the operating rod. The attached detection tool, the amplifier electrically connected to the detection rod of the detection tool and amplifying the leakage signal of the signal cable, and the output signal of the amplifier can be recognized as sound, light, or other form. It is composed of a converter for converting into.

[Action]

If the signal cable has a defective insulation part, the signal leaks into the soil in the vicinity. By inserting the bifurcated detection rod into the soil and amplifying it to output the sound or turn on the light, it is possible to detect the presence or absence of the leakage signal, and the sound output or the turn-on display can be maximized. By finding the point, it is possible to detect the leakage point, that is, the defective insulation point of the signal cable. Therefore, it is only necessary to perform the work of removing weeds, turning over the lid, and the like only for the defective insulation portion detected in this way, so that the maintenance and inspection work is extremely simple and easy. In addition, since the actual detection operation requires a large number of repeated operations over a long distance,
It is desirable that the work load for each operation be as light as possible.
However, the detection tool of the present invention is
Since the support plate to which the support rod is attached is fixed, if the operating rod is made long enough, the worker can put the detection rod into the ground and pull it out easily. The operating rod can be gripped and carried out at a height portion (for example, the chest height position), so that the certainty and speediness of the above work are increased, and the labor is not wasted. Therefore, workability is improved and work load is reduced. Furthermore, by adopting a configuration in which two detection rods are detachably attached to the support plate, it is possible to replace the worn detection rods. It enables semi-permanent use of the ingredient.

〔Example〕

The structure of the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a perspective view showing an entire insulation failure detecting device 1 according to an embodiment of the present invention. As shown in the figure, in this detection device 1, two detection rods 3a, 3b each having a length of about 12 to 15 cm are detachably attached to a support plate 2 made of wood or the like via a nut 4 at intervals of 20 to 30 cm. It is attached to and is bifurcated. The detection rods 3a and 3b are for being inserted into the soil near the signal cable to detect a leak signal from the signal cable, and a material such as hard brass is suitable. On the support plate 2, an operating rod 5 formed of a hard and lightweight material such as a vinyl pipe is vertically installed upright. The rear ends of the two detection rods 3a and 3b are connected to an amplifier 6. The amplifier 6 of this embodiment amplifies the signals detected by the detection rods 3a and 3b, and outputs them as voice through an earphone 7 as a converter. As shown in FIG. 2, the amplifier 6 includes a transistor 8 and an iron core inductance 9
The input signal is amplified through.

Next, a method of using the insulation failure detection device 1 thus configured will be described. The signal cable 10 has, for example, as shown in FIG. 2, a + wire 10a and a wire 10b, and a trough 13 in the soil (see FIG. 3 and FIG. 3) between the equipment boxes 12 and 12 installed at a predetermined distance. It is designed to be laid inside (see Fig. 4) or directly in the soil (see Fig. 5). In order to detect a defective insulation portion, first, the signal generator 14 is connected to the + side terminal and the − side terminal of the instrument box 12. In this embodiment, the signal generator 14
Although a publicly known level crossing alarm sound generator is used as the above, other audio frequency generators or instruments that generate characteristic signals may be used. In such a state, if the signal cable 10 has a defective insulation portion, as shown in FIG. 2, the low-frequency signal for level crossing warning from the signal generator 14 is transmitted from this defective insulation portion to the soil. Leak. Therefore, when inserting the bifurcated detection rods 3a, 3b into the soil near the signal cable 10 while inserting the earphone 7 of the insulation failure detection device 1 into the ear, the signal of the level crossing alarm sound leaked from the insulation failure point is generated. Detection rod
It is input to the amplifier 6 through 3a and 3b and is amplified here. Then, it is output from the earphone 7. Therefore, the operator only needs to pay attention to whether or not the intermittent sound for the level crossing alarm is heard from the earphone 7, and it is possible to detect the presence or absence of the defective insulation portion. Further, along the signal cable 10 at appropriate intervals such as 50 cm intervals, the insertion positions of the detection rods 3a and 3b are sequentially changed to obtain the maximum value of the leakage signal from the signal cable 10, that is, an intermittent sound for a level crossing alarm. By detecting the position where the loudest sound is heard, it is possible to accurately search for a defective insulation portion.

The detection rods 3a and 3b are, as shown in FIG.
It may be inserted parallel to the trough 13 or may be inserted in a direction orthogonal to the trough 13 as shown in FIG. According to the experiment, when a signal generator 14 which outputs an intermittent signal of an audio frequency of 700 to 1000 Hz with an output of 10 W is used, it is shown in FIGS. By any of the methods shown in Fig. 4, it was possible to clearly hear the audio leakage signal leaking from the insulation failure point even at a position 700 meters away from the insulation failure point. Further, as shown in FIG. 5, when the signal cable 10 is directly buried in the soil, it suffices to insert the detection rods 3a and 3b into the vicinity thereof, and in this case also, the signal cable 10
It may be inserted in parallel with or in a direction orthogonal to. FIG. 5 shows a case where the signal cable 10 is inserted in parallel. In the above-mentioned two forms, the signal leaked from the insulation failure point is larger in the case where the signal cable 10 is directly buried in the soil than when the signal cable 10 is laid in the trough 13. It goes without saying that detection is easy. If the detection rods 3a, 3b are worn due to the cumulative use time increase, the nut 4 may be unscrewed and replaced with new detection rods 3a, 3b.

As described above, according to the present embodiment, the detection rods 3a and 3b are inserted into the soil near the signal cable 10 at predetermined intervals, and the extremely simple operation of detecting the presence or absence of the signal leaking from the defective insulation portion and the strength thereof, etc. Thus, it is possible to accurately search for the presence or absence of a defective insulation portion and its position. Therefore, the work associated with the repair of the defective insulation portion can be achieved by turning over the trough lids of the two or three troughs at the searched location or digging up the soil in the vicinity thereof, and it is possible to realize a remarkable omission.

FIG. 6 shows the case of detecting the insulation failure of the single wire of the + wire 10a or the − wire 10b of the signal cable 10. In this case, connect the negative terminal of the signal generator 14 to ground,
The + side terminal may be connected to the single wire, and a defective insulation portion may be searched for as described above.

By the way, the present invention is not limited to the above-described embodiments, but can be appropriately modified. For example, the signal generator
As described above, 14 may be any device that generates a specific signal, and need not be limited to one that generates an audio frequency.
Also, as a method of converting the output of the detection device 1 into a recognizable form, various conversion methods such as a speaker method, a meter method, and a lighting method can be used in addition to using the earphone. Further, the amplifier 6 can be detachably attached to the operating rod 5, or the operator can store it in a pocket or the like. Furthermore, the technique of the present invention can of course be applied to other communication cables and power cables in addition to searching for a defective insulation portion of the signal cable 10 of a railway or the like.

[Effect of device]

As described above, according to the present invention, by inserting a detection rod into the soil near the signal cable and detecting the presence / absence of a signal leaking from an insulation failure point and the strength of the signal, the presence / absence of an insulation failure point and the insulation failure can be detected. It is possible to search for the position of the location extremely accurately, and it is possible to realize a remarkable simplification, labor saving, and speedup of the entire work including the search work and the subsequent repair work of the signal cable. Therefore, it is possible for a railway, an electric power company or the like having a huge total working distance to enjoy irreplaceable profits. Further, since the detection tool of the present invention adopts a structure in which the support plate with the support rod is fixed to the tip of the lightweight operation rod, if the operation rod is made sufficiently long, the detection rod is The operator can perform the work of piercing and pulling on the ground by grasping the operating rod at the height (for example, chest height position) where it is most easy for the operator to put the force on the ground. No more wasted labor. Therefore, workability is improved and work load is reduced. Furthermore, wear is most likely to occur due to repetitive work 2
Since the structure in which the book detection rod is detachably attached to the support plate is adopted, the detection rod can be exchanged if necessary. Therefore, even if a spare detection rod is prepared, the detection tool can be used semipermanently, which is very economical.

[Brief description of drawings]

The drawings are all related to the present invention. FIG. 1 is an overall perspective view of a device for detecting a defective insulation portion, FIG. 2 is an electric circuit diagram for explaining its use state, and FIGS. FIG. 6 is a cross-sectional view of a track showing a different positional relationship between the cable and the insulation failure detection device, and FIG. 6 is an electric circuit diagram in the case of detecting an insulation failure point of a single-line signal cable. 10 ... Signal cable, 3a, 3b ... Detection rod 6 ... Amplifier, 7 ... Earphone

Claims (1)

[Scope of utility model registration request] 1. A device for detecting a defective insulation portion by detecting a leakage signal of a signal cable buried in soil, wherein a support plate is vertically fixed to the tip of a light and long operating rod. A detection tool comprising two detection rods attached to a support plate in a bifurcated manner at appropriate intervals and detachably attached so as to be parallel to the axis of the operating rod, and the detection rod of the detection tool and an electric device. Signal cable comprising an amplifier that is electrically connected and amplifies a leak signal of the signal cable, and a converter that converts an output signal of the amplifier into a recognizable form such as sound, light, or the like. Insulation failure detection device.