JP2012110134A - Indirect live-line working tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indirect live-line working tool capable of issuing an alarm when the distance between an alarming unit and a live-line such as a charging line becomes less than a prescribed distance during an indirect live-line work despite its simple structure, and also capable of giving a worker a warning against an approach even to a live-line such as a charging line which is not an object of work.SOLUTION: An indirect live-line working tool 1 is an indirect live-line working tool to be used in an indirect live-line work comprising: an insulation rod 8 including a head part 2 at its top end part for contacting a live-line and a griping part 14 at its bottom end part with a limit flange 12 at the upper part of the griping part 14; a voltage detecting part 10 arranged so as to contact the limit flange 12 or arranged on the insulation rod 8 within the limit flange 12 for detecting a state of charge of the live-line in a non-contact manner to transmit an output signal; and an alarm issuing part 11 for receiving the output signal transmitted by the voltage detecting part 10 and issuing an alarm by light or sound when the signal exceeds a desired set value.

Description

  The present invention is provided with an alarm near the limit brim of the insulating rod used in the indirect hot wire operation, and generates an alarm when the distance between the alarm device and the live wire such as a charging wire is within a desired distance. The present invention relates to an indirect hot wire work tool that can always monitor a separation distance during hot wire work.

Conventionally, indirect hot wire work has been done using an indirect hot wire work tool with an insulating rod as the main shaft, but as a method to ensure separation from live wires such as charging wires, the limit brim from the tip of the insulating rod. The distance was set to 60 cm, and the worker was carrying out the work with a grip on the end side of the limit collar. By such a working method, the separation from the high voltage charging location was secured 60 cm or more.
However, since the operator is usually gazing at the position from the tip of the insulating rod to the limit brim, the tip of the insulating rod may be approaching within 60 cm with respect to the charging electric wire other than the wire in contact. There was a problem that the separation distance could not be confirmed for all the surrounding charging wires and the danger could not be avoided completely.
For the purpose of eliminating such danger, a technique for improving insulation and a technique for notifying workers etc. of abnormal approach to a live wire such as a charging wire have been developed. Has been.

Patent Document 1 discloses an invention relating to an indirect hot wire tool used for indirect hot wire work of a 20 kV class overhead distribution line, which is a special high voltage hot wire, under the name “indirect hot wire tool”.
The invention disclosed in Patent Document 1 is an indirect hot wire tool such as Yatco, and the insulation distance from the front end portion of the insulating operation rod to the limit rod at the lower end portion is at least 110 cm.
For indirect hot wire tools with these characteristics, standard safety distances are set to ensure safe work in addition to meeting occupational safety and health regulations, and insulation distances are increased by taking into account the rise of wires in hot line distribution work. Since the length is 110 cm, the work content is not limited and the indirect hot-line work can be performed safely.

Next, Patent Document 2 discloses an invention related to a remote control yakko that grips a high-voltage overhead wire and other parts by remote control under the name “remote control yakko”.
The invention disclosed in Patent Document 2 is composed of an insulating main shaft, a gripping tool attached to the tip, an operating tool attached to the base of the main shaft, and the like.
In this type of remote control YATCO, the gripping tool that approaches the high-voltage overhead line is made of an insulating resin, so there is no risk of short-circuiting with the high-voltage overhead line, etc. high.

Patent Document 3 discloses an invention relating to a voltage detector that can identify a voltage difference between electric power facilities under the name of “light emitter and voltage detector”.
The invention disclosed in Patent Document 3 is a voltage detector provided with a terminal to be brought into contact with an object to be detected at the tip of an insulating rod, and includes a grip, a telescopic insulating rod, a retractable joint, a support rod, a light emitter, and a contact. Consists of terminals. This illuminant includes an inorganic EL material and has a structure in which four are combined, and emits light in four colors.
In the light emitter and the detector having such characteristics, the voltage at which the inorganic EL material of the light emitter starts to emit light when the light emitter is brought into contact with the voltage unit can be adjusted. It can be known that the voltage is higher than the light emission start voltage. Moreover, the difference in voltage according to the position and color of light emission can be easily identified by the combination of the type and arrangement of the light emitters.

Furthermore, in Patent Document 4, an electric field sensor is installed on a moving body such as a crane that operates and operates in the vicinity of a power transmission section such as a power transmission line under the name of “power transmission section approach alarm”, and a power transmission line is transmitted from this output. And an alarm device for the purpose of notifying an operator of an abnormal approach of the moving body to the power application unit is disclosed.
Hereinafter, the invention disclosed in Patent Document 4 will be described. The invention disclosed in Patent Document 4 includes a plurality of electric field sensors in the aforementioned moving body, receives these outputs, calculates the distance between the moving body and the power application unit, and calculates the calculated value and the abnormal approach limit set value. The present invention relates to a power generation unit approach alarm device comprising a processing arithmetic circuit for determining the presence or absence of an abnormal approach by comparison, and an alarm main body that issues an alarm in response to an output from the processing arithmetic circuit.
In the power-applying unit approach alarm having such characteristics, the output of the electric field sensor varies depending on the voltage of the power-applying unit and the distance from the power-applying unit. The moving body is provided with a total of three electric field sensors at a fixed distance, and the distance between the moving body and the power application unit is calculated by triangulation. If it is determined from the calculation results that the mobile object has entered within the approach limit distance, the alarm unit will immediately operate to notify the operator of abnormal approach and prevent contact accidents with power transmission lines, etc. .

JP 2008-206253 A Japanese Patent Laid-Open No. 10-108328 JP 2008-249626 A JP-A-9-243670

In the invention disclosed in Patent Document 1, since the insulation distance is as long as 110 cm, the indirect hot wire operation can be performed safely.
However, this is an advantageous effect only for the special high-voltage line that is the work target at that time, and since the separation distance cannot be confirmed for the other charged wires, the safety of the entire periphery of the worker cannot be ensured.

Next, in the invention disclosed in Patent Document 2, there is no risk of a short circuit with a high voltage overhead wire or the like, and the safety of work is high.
However, similar to the invention disclosed in Patent Document 1, this is an advantageous effect for only the charged electric wire to be worked, and safety is not completely ensured.

In the invention disclosed in Patent Document 3, it is possible to easily identify a voltage difference according to a light emitting position and a light emission color by bringing a light emitter into contact with a voltage unit and combining the types and arrangement of the light emitters.
However, the object of identification is only the voltage part that can be contacted by the worker at that time, and the state of other voltage parts cannot be known at the same time.
Thus, in the invention disclosed in Patent Document 3, even if the voltage part other than being in contact is approached, the operator cannot be notified of this approach, and thus the risk of an accident cannot be excluded.

Further, in the invention disclosed in Patent Document 4, the distance between the moving body and the power applying unit is calculated from the outputs of a total of three electric field sensors provided at a fixed distance.
In the invention of this document, the moving body is a crane arm, and its shape is a long and narrow cube. Therefore, when a total of three electric field sensors are attached to only one surface, that surface, that is, the detection surface of the sensor is the target. The electric field by this power transmission line can be detected.
However, on the back side of the detection surface of the electric field sensor, it is considered that the sensitivity of the sensor is low and it is difficult to detect the electric field, and the electric field due to the transmission line on the back side cannot be detected. Therefore, although the power transmission line is stretched in various directions on the site, this may not be detected at the same time in the present invention, and it may not be possible to completely prevent a contact accident of the mobile body with the power transmission line or the like.

  The present invention has been made in response to such a conventional situation, and the distance between an alarm device and a live wire such as a charging wire is a predetermined distance during an indirect live wire operation while having a simple structure. An object of the present invention is to provide an indirect hot wire work tool that generates an alarm when it is within, and can notify the worker of the approach to a live wire such as a surrounding charging wire that is not a work target.

In order to achieve the above object, the invention described in claim 1 is an indirect hot wire working tool used in indirect hot wire work, wherein a head portion that is in contact with the live wire is provided at the upper end and a limit collar is provided at the upper part. Is installed in contact with the insulation rod with the grip at the lower end and the limit collar, or is installed on the insulation rod inside the limit collar, and detects the charging state of the live line in a non-contact manner and outputs an output signal And a warning generation unit that receives an output signal transmitted from the voltage detection unit and issues a warning by light or sound when a desired set value is exceeded. .
In the indirect hot wire working tool having the above configuration, since the head portion is provided at the upper end of the insulating rod and the grip portion is provided at the lower end, the live wire that grips the grip portion and serves as a charging location for the work target. Use it close to. Moreover, since the limit collar is provided in the upper part of the grip part, the part which can be hold | gripped among the insulation rod full length becomes clear.
On the other hand, since the voltage detector detects the charged state of the live line in a non-contact manner, the influence of the live line is detected even at a position away from the live line by a certain distance. Therefore, when the voltage detector is installed so as to contact the limit collar or is installed on an insulating rod inside the limit collar, it is a position that can be gripped by the operator and is closest to the live line to be worked on. The effect of live lines at the location is detected. Here, “so that the detection section contacts the limit collar” includes the case where the limit collar is attached to the insulating rod, and the detection section is provided on the front side or the back side of the limit collar. “To the insulating rod inside the brim” means a portion that cannot be seen because the insulating rod is hidden by the limit brim when viewed from the side.
Further, the detection state of the live line in the power detection unit may or may not be limited to a case where the detected value exceeds a certain threshold value. As an example of the threshold value, a current value at a safe separation distance from the live line can be considered.
Subsequently, the alarm generation unit receives the output signal transmitted from the voltage detection unit, and notifies the operator that the alarm generation unit is approaching the high-voltage live line. In addition, since the alarm generation unit issues an alarm when a desired set value is exceeded, the above-described threshold is set by arbitrarily assuming a separation distance from the live line. In addition, the case where it is a case where it exceeds a desired setting value includes the case where it sets and determines a threshold value in the voltage detection part other than an alarm generation part.
Further, since the alarm is issued when the threshold is exceeded, the alarm stops when the worker leaves more than the separation distance from the live line assumed in the threshold even if the alarm is continuing.

Next, the invention according to claim 2 is the indirect hot wire working tool according to claim 1, wherein the head portion includes a movable portion that grips the live wire, the upper end is connected to the movable portion, and the grip portion An auxiliary rod having a lower end connected to an operation lever attached to be openable and closable is provided.
In the indirect hot wire working tool configured as described above, the movable portion of the head portion directly contacts the live wire. Since the upper end of the auxiliary rod is connected to the movable portion of the head portion, when the auxiliary rod moves up and down, the connecting portion between the head portion and the auxiliary rod moves up and down accordingly. However, since the head portion is provided at the upper end of the insulating rod in the cited claim 1, the connecting portion between the head portion and the insulating rod does not move up and down, and as a result, the entire head portion is connected to the insulating rod. Will be tilted around the center. In addition, an operating lever attached to the grip is connected to the lower end of the auxiliary rod, and the operating lever is attached to the grip so that it can be opened and closed. Go down. On the other hand, the auxiliary rod rises upward when moving away from the grip portion direction. From the above, when the operating lever is opened and closed with respect to the grip portion, the auxiliary rod moves up and down at the same time, and the head portion tilts around the connecting portion between the head portion and the insulating rod.
In addition, it has the same action as the indirect hot wire working tool according to claim 1.

Furthermore, the invention according to claim 3 is the indirect hot wire working tool according to claim 1 or claim 2, wherein a plurality of voltage detectors are installed at different positions in the circumferential direction of the insulating rod, and a plurality of alarm generators are provided. Each output signal from the voltage detector is individually received, and when any of the output signals exceeds a desired set value, an alarm is issued with light or sound to detect the charged state of the live line in the circumferential direction. It is characterized by that.
In the indirect hot wire working tool having the above-described configuration, a plurality of voltage detectors are installed at different positions in the circumferential direction of the insulating rod, so that the charged state of the live wire is detected for each installed direction. In addition, the alarm generation unit individually receives output signals from a plurality of voltage detection units, and issues an alarm when any of the output signals exceeds a desired set value. When there are a plurality of high-voltage hot wires that are too large, the operator is notified of all of these hot wires at the same time.
In addition, it has the same action as the indirect hot wire working tool according to claim 1 or claim 2.

The invention according to claim 4 is the indirect hot-wire working tool according to any one of claims 1 to 3, wherein the plurality of voltage detectors are attached at different positions in the circumferential direction of the insulating rod. And a calculation processing unit that receives each output signal of the plurality of voltage detection units. The calculation processing unit extracts a maximum output signal from the output signals of the plurality of voltage detection units and outputs the maximum output signal. When the detection means that outputs the output signal is specified and the position information is added to the maximum output signal and transmitted, the alarm generation unit receives the maximum output signal of the arithmetic processing unit and exceeds the desired set value. An alarm is issued by light or sound including position information.
In the indirect hot wire working tool having the above-described configuration, the power detection unit includes a plurality of power detection units and an arithmetic processing unit that receives output signals of the power detection units. Instead of transmitting the signal as it is to the alarm generation unit, the result of the arithmetic processing is transmitted.
This calculation process is performed by the calculation processing unit, and the maximum output signal is extracted from the output signals of the plurality of voltage detection means, so that the direction of the live line closest to the worker is selected. Subsequently, since the power detection means that has output the maximum output signal is specified, it is determined which of the plurality of power detection means has detected the closest live line.
And since the alarm generation unit receives the maximum output signal of the arithmetic processing unit and issues an alarm when the desired set value is exceeded, when there are multiple live lines that are abnormally approached by the worker The presence direction of the closest live line is notified to the operator. Further, “including position information” means that it is clarified which of the plurality of voltage detection means is issuing an alarm, and the position in the circumferential direction can be recognized.
In addition, for the voltage detection means other than the one that outputs the maximum output signal among the output signals, the direction in which the live line exists can be obtained by changing the color of the alarm light for those that exceed the desired set value. Is notified to the operator.
In addition, it has the same action as the indirect hot wire working tool according to any one of claims 1 to 3.

In the indirect hot-wire working tool according to claim 1 of the present invention, the voltage detector is installed so as to come into contact with the limit collar, or is installed on an insulating rod inside the limit collar. The charged state of the live line at a position which is possible and closest to the live line to be worked is detected, and the maximum safety of the worker is ensured because the voltage is detected under the most dangerous conditions.
Furthermore, since the alarm generation unit notifies the worker that the live line is approaching, the worker can know the approach to the live line other than the work target. In the case of a high-pressure live wire, a flashover can occur even if it is not in direct contact with it, so knowing the approach to the high-pressure live wire can avoid the risk of a flashover accident and is particularly effective. Moreover, since the alarm generation unit issues a light or sound alarm, the worker can recognize the approach to the live line reliably and instantaneously.
Moreover, since a threshold value is set for issuing an alarm, it is possible to block low-level noise caused by the other periphery of the indirect live-line work tool and to increase the reliability of the output signal. Furthermore, since this threshold value is set to a desired value assuming a separation distance from a live line, it can be used under various conditions and is highly versatile. In this case, whether or not the desired set value is exceeded is determined by setting a threshold value in the voltage detection unit in addition to the alarm generation unit, and setting the threshold value in both sides can increase the reliability of the output signal. It will be higher.
Furthermore, since the ongoing alarm is stopped when the distance is longer than the distance from the live line assumed in the threshold, it is possible to prevent the worker from moving away more than necessary, ensuring safety and not excessively reducing the work efficiency.
In addition, since the indirect hot-wire working tool according to claim 1 can notify the worker of the approach to the high-voltage hot wire with a simple configuration of the power detection unit and the alarm generation unit, the manufacturing cost can be suppressed and the economy can be reduced. Good sex.

In the indirect hot wire working tool according to claim 2 of the present invention, when the operation lever is opened and closed with respect to the grip portion direction, the head portion tilts around the connecting portion between the head portion and the insulating rod. The head portion can be operated by opening and closing the operating lever with the other hand while supporting the grip portion with one hand, so that it can be operated reliably and easily. In addition, since the head portion grips the live line, the live line can be handled with a reliable and easy operation, and the dangerous live line work can be completed in a short time.
In addition, it has the same advantageous effect as the indirect hot wire working tool according to claim 1.

In the indirect hot wire working tool according to claim 3 of the present invention, since the plurality of voltage detectors are installed at different positions in the circumferential direction, the charged state of the live wire is detected for each installed direction. Therefore, the direction close to the live line can be detected with higher accuracy. Therefore, the worker can more accurately grasp the existence of the live line that is too close.
Moreover, even if there are a plurality of live lines that are too close, the worker is notified of all of these live lines at the same time, so which of the directions in which the voltage detector is installed is the safest direction. Can be determined. Therefore, further danger avoidance is possible compared with the case where there is only one voltage detector.
In addition, it has the same advantageous effect as the indirect hot wire working tool according to claim 1 or claim 2.

In the indirect hot-wire working tool according to claim 4 of the present invention, since the direction of the live line closest to the worker is selected, the direction of the live line to be separated with the highest priority can be recognized, so that danger avoidance is achieved. Can be done efficiently. In addition, after the first separation, if the power line is abnormally approached in another direction, another voltage detection means issues an alarm, which can be avoided again.
In addition, it has the same advantageous effect as the indirect hot wire working tool according to any one of claims 1 to 3.

It is a side view of the indirect hot wire working tool which concerns on Example 1 of this invention. It is a use condition figure of the indirect hot wire working tool concerning Example 1 of the present invention. (A) is the elements on larger scale of the indirect hot wire working tool which concerns on Example 2 or Example 3 of this invention, (b) is the sectional view on the AA line in (a). It is a calculation processing flowchart of the indirect hot wire working tool which concerns on Example 3 of this invention.

The indirect hot wire working tool of Example 1 which concerns on this invention is demonstrated in detail using FIG.1 and FIG.2.
FIG. 1 is a side view of an indirect hot wire working tool 1 according to the first embodiment, and FIG. In addition, about the component shown in FIG. 1, the same code | symbol is attached | subjected also in FIG. 2, and the description is abbreviate | omitted.
As shown in FIG. 1, the indirect hot-wire working tool 1 is commonly referred to as a Yatco, and is provided with a head portion 2 at the upper end of a main shaft insulating rod 8. The head portion 2 is a portion that holds a live wire such as a high-voltage electric wire in an indirect hot wire operation, and includes two base portions 3 and 4 having a substantially arc shape, a head mounting portion 5, and a base portion hinge 6. Composed. The upper end portions of the base portions 3 and 4 are portions that are in direct contact with the live lines and are gripped, and the occlusal portions therefor have shapes that match each other. The head mounting portion 5 is fitted and inserted into the tip of the insulating rod 8, and the lower end portions of the base portions 3 and 4 are overlapped and held by using the base portion hinge 6 provided at the upper end.
The base parts 3 and 4 are opposed to each other with the base part hinge 6 as a center, and the base part 3 is fixed to the insulating rod 8, but the base part 4 tilts about the base part hinge 6. It is possible to open and close and hold and release the live wire. Further, as will be described later, the base portion 4 is connected to an auxiliary rod 15 described later via an angle adjusting shaft 7 provided near the top of the arc-curved portion, and is tilted by operating the operation lever 17. Can be made.
Next, the insulating rod 8 has a single layer structure of an insulating material, and includes a grip portion 14 at the lower end in the direction opposite to the head portion 2. Between the head part 2 and the grip part 14, a rain-cut collar 9 is attached at a position slightly away from the head attachment part 5. Further, a limit collar 12 is attached to the lower part of the rain-cut collar 9 at a distance from each other. A grip 14 is located below the limit collar 12. In addition, although the length from the front-end | tip of the insulation stick | rod 8 to the limit collar 12 is 60 cm and is the safe separation distance 23, this length is not limited to 60 cm.
The limit collar 12 is attached around the axis of the insulating rod 8 at the limit collar attachment portion 13, and one voltage detector 10 is installed on the surface of the limit collar attachment portion 13. This voltage detector 10 includes a warning generator 11. Also, a plurality of voltage detectors 10 may be provided, and the installation position is not limited to the limit collar mounting portion 13 surface. Specifically, it may be installed on the surface of the insulating rod 8 inside the limit collar 12. In this case, although it is considered that the sensitivity of the electric detection 10 is affected by the presence of the limit collar 12, it can be configured to be covered by the limit collar 12, so that the electric detector 10 is damaged or exposed to rain and broken. The possibility of causing it to be reduced is reduced.
The electric detector 10 is a non-contact type and detects a minute current flowing through the human body and the ground through the floating capacitance between the electric charger and the detection electrode of the electric detector 10 when approaching the electric charger. When the minute current exceeds the operating current value at a predetermined distance from the charging body, the alarm generation unit 11 generates an alarm by light and / or sound. Since the voltage detector 10 is installed on the surface of the limit collar mounting portion 13 which is a part of the limit collar 12, the operating current value at the above-described safe separation distance 23 is set as a threshold value. This threshold value can be set freely. Therefore, for example, the safety separation distance 23 can be set as a desired threshold value with a margin.
Further, the above-described auxiliary rod 15 is connected to the base portion 4 by the angle adjustment shaft 7 at the upper end, and connected to the operation lever 17 by the operation shaft 19, and is slightly smaller than the rain-cut collar 9 in the middle. A rain-cutting collar 16 is provided. Further, since the upper end of the operation lever 17 is connected to the grip part 14 via the operation hinge 18 and can be tilted about the operation hinge 18, the base part 4 is connected to the base part 3 via the auxiliary rod 15. It can be gripped and released between.

Next, FIG. 2 shows a use state diagram of the indirect hot wire working tool 1. In this embodiment, a description will be given by adopting a charging wire as an example of a live wire. The live line is a concept indicating a charged part that is widely charged, not limited to a charged electric wire, and is used in accordance with the concept in the present application.
The worker 20 grips the grip portion 14 of the indirect hot wire work tool 1 near the upper end of the utility pole 22, and brings the head portion 2 close to the charging wire 21b to be worked. At this time, the charging wire 21b is kept at a safe separation distance 23, and the charging wire 21a, the charging wire 21c, and the voltage detector 10 are separated from each other by the charging wire voltage detector distances 24 and 25, respectively. The safety separation distance 23 is ensured by visually observing the distance between the tip of the insulating rod 8 and 21b. However, the distances 24 and 25 between the charged wire voltage detectors are not parallel to the insulating rod 8 and are difficult to measure visually. It is.

Next, the effect | action of the indirect hot wire working tool 1 which concerns on Example 1 is demonstrated.
The base part 4 is connected to an auxiliary rod 15 so as to be tiltable about the base part hinge 6, and the auxiliary bar 15 is connected to an operating lever 17, and the operating lever 17 is connected to the grip part 14 and is connected to the operating hinge. Since it can be tilted around 18, when the operating lever 17 is opened and closed in the direction of the grip 14 or in the opposite direction, the base 4 is simultaneously opened and closed in the direction of the base 3 or in the opposite direction.
Further, since the rain-cutting collar 9 is provided above the grip 14 of the insulating rod 8 and the rain-cutting collar 16 is provided above the operating lever 17 of the auxiliary rod 15, it is transmitted from the head portion 2 to the insulating rod 8 or the auxiliary rod 15. The rain water that hangs directly on the grip 14 and the operation lever 17 is cut.
The insulating rod 8 is made of an insulating material, the length from the tip of the insulating rod 8 to the limit collar 12 is a safe separation distance 23, and the grip portion 14 and the operation lever 17 exist below the limit collar 12. Therefore, as described in the description of FIG. 2, the worker performs the work by grasping the grip portion 14 and the operation lever 17 and bringing the tip of the insulating rod 8 into contact with or close to a live wire such as a charging wire to be worked.
Furthermore, since the voltage detector 10 uses the operating current value at the safe separation distance 23 as a threshold value, an alarm is generated for all current values exceeding the threshold value. That is, since it is irrelevant whether it is a live line such as a charging wire to be worked, not only the safety separation distance 23 but also the distances 24 and 25 between the charging wire voltage detectors that are difficult to visually measure are shorter than the safety separation distance 23. Generate an alarm.

Next, the effect of the indirect hot wire working tool 1 according to the first embodiment will be described.
When the operation lever 17 is opened and closed, the base part 4 is also opened and closed at the same time. Therefore, the base part 4 can be moved remotely and safely with one hand, and the operability is good.
Further, since rain water that directly drops from the head portion 2 through the insulating rod 8 or the auxiliary rod 15 to the grip portion 14 and the operation lever 17 is cut, the hand is difficult to slip.
And since an operator works by making the tip of the insulating rod 8 close to the charging wire while visually confirming the distance between the charging wire to be worked and the limit brim 12, the live work can be performed safely.
Furthermore, since the voltage detector 10 generates an alarm for all current values exceeding the threshold value regardless of whether the power line is a live line such as a charged electric wire to be worked on, it is possible to work on the approach to the surrounding live line that is not the work target. Can be informed. Therefore, it is possible to prevent the occurrence of an unexpected flashover accident and the like, and it is possible to perform hot line work more safely.
Moreover, since the alarm generator 11 is built in the voltage detector 10, the wiring connecting them separately is not exposed to the outside, so that the size can be reduced and the work is not disturbed.

In addition, since the detector 10 has a direction dependency in detection, it is desirable that the detection window is opposed to a live wire such as a charging wire to be worked on. Therefore, it is avoided that no detection is made even if a live wire such as a surrounding charging wire that is not a work object is approached. In order to further improve the detection capability of the surrounding live lines that are not such work objects, the voltage detector 10 is not a cube, but a ring shape that goes around the axis of the insulating rod 8, or a plurality of like the second embodiment. It is also conceivable to devise such that the voltage detector 10 is installed around the axis of the insulating rod 8.
In addition, a modified example in which the head portion 2 and the like of the present embodiment are formed in a linear tongue shape is also conceivable.

The indirect hot wire working tool of Example 2 which concerns on this invention is demonstrated in detail using FIG. In addition, about the component shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 3A is a partially enlarged view of the indirect hot wire working tool 26 according to the second embodiment, and FIG. 3B is a cross-sectional view taken along line AA in FIG.
As shown in FIG. 3A, in the indirect hot wire working tool 26 according to the second embodiment, a total of four voltage detectors 27 a to 27 d are installed at the height of the limit collar mounting portion 13. Moreover, as shown in (b), the voltage detectors 27a to 27d of the indirect hot-wire working tool 26 are spaced 90 degrees around the axis of the insulating rod 8 on the surface of the limit collar mounting portion 13 surrounding the outer periphery of the insulating rod 8. Are installed at different positions. Each of the voltage detectors 27a to 27d includes the same alarm generation unit 28. That is, a total of four alarm generation units 28 are installed around the axis of the insulating rod 8. The voltage detectors 27 a to 27 d may be installed on the surface of the insulating rod 8 inside the limit collar 12.
As in the first embodiment, when the current detected by the voltage detectors 27a to 27d exceeds the operating current value at a predetermined distance from the charger, the alarm generation unit 28 generates an alarm by light and / or sound. Moreover, in Example 3 described later, any one of the voltage detectors 30a to 30d includes a calculation processing unit (not shown) in addition to the alarm generation unit 28. However, in Example 2, the calculation processing unit is provided. Absent.

Next, the operation of the indirect hot wire working tool 26 according to the second embodiment will be described. In the indirect hot wire working tool 26, a total of four voltage detectors 27 a to 27 d are installed at the height of the limit collar mounting portion 13, so that the operating current value at the safe separation distance 23 is set as a threshold value.
Moreover, since the voltage detectors 27a to 27d are installed at different positions every 90 degrees around the axis of the insulating rod 8, currents are detected independently in each direction. Further, since the alarm generator 28 is built in each of the voltage detectors 27a to 27d, the alarm is generated independently in each direction in the same manner.
In the alarm generation unit 28, an alarm is generated when a threshold value in the safe separation distance 23 is exceeded. Therefore, when there are a plurality of high-pressure live lines that are too close to the worker, all these live lines are operated simultaneously. Is notified to the person.
In addition, it has the same action as the indirect hot wire working tool 1 according to the first embodiment.

Furthermore, the effect of the indirect hot wire working tool 26 according to the second embodiment will be described.
Since the plurality of voltage detectors 27a to 27d are installed in the indirect hot wire working tool 26, it is possible to detect a live wire such as a charged electric wire present in the surroundings with a higher sensitivity than in the case of a single voltage detector. However, since the alarm is set to be generated only when the threshold value in the safe separation distance 23 is exceeded, even if the sensitivity is good, it is not a malfunction due to noise or the like but has sufficient reliability.
Furthermore, since the charged state of a live wire such as a charging wire is detected for each installed direction, the direction close to the live wire can be detected with higher accuracy. Since an alarm is issued by light and / or sound, the operator can grasp the proximity direction instantly and move away in the opposite direction.
Moreover, even if there are a plurality of live lines that are too close, the operator is notified of all of these live lines at the same time, so which of the directions detected by the voltage detectors 27a to 27d is the safest direction. It can be judged whether there is. Therefore, it is possible to avoid danger more quickly and accurately than in the case where there is only one voltage detector.
In addition, it has the same advantageous effects as the indirect hot wire working tool 1 according to the first embodiment.
In the embodiment of the present invention, the alarm by light and sound has been described. However, for example, an alarm generator 28 that generates vibration may be provided. This is because the head unit 2 should be watched during the work, and it is also possible to detect by vibration when it is difficult to detect danger due to ambient noise. Furthermore, although the voltage detectors 27a to 27d are arranged around the surface of the limit collar mounting portion 13 in the second embodiment, they may be installed around the insulating rod 8 inside the limit collar 12. In this case, since it is difficult to grasp the positional information in the circumferential direction of the sound, light or vibration generated by the alarm generation unit 28, at least the alarm generation unit 28 is installed on the lower side of the inner insulating rod 8 and is limited. It may be arranged so as to be exposed from the collar 12.

The indirect hot wire working tool of Example 3 according to the present invention will be described in detail with reference to FIGS. 3 and 4. Although FIG. 3 was used for the description of the second embodiment, the same description will be given for the third embodiment with reference to FIG. The constituent elements shown in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 3A is a partially enlarged view of the indirect hot wire working tool 29 according to the third embodiment, and FIG. 3B is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an operational processing flow diagram of the indirect hot-line work tool 29.
As shown in FIG. 3A, in the indirect hot wire working tool 29 according to the third embodiment, a total of four voltage detectors 30 a to 30 d are installed at the height of the limit collar mounting portion 13. Moreover, as shown in (b), the voltage detectors 30a to 30d of the indirect hot wire working tool 29 are the same as those of the second embodiment on the surface of the limit collar mounting portion 13 that surrounds the outer periphery of the insulating rod 8. Installed every 90 degrees around the axis. Each of the voltage detectors 30a to 30d includes the same alarm generator 28. That is, a total of four alarm generation units 28 are installed around the axis of the insulating rod 8. The voltage detectors 30 a to 30 d may be installed on the surface of the insulating rod 8 inside the limit collar 12.
The difference from the second embodiment is that one arithmetic processing unit (not shown) is provided. It is sufficient that the arithmetic processing unit is built in any one of the voltage detectors 30a to 30d. Among the voltage detectors 30a to 30d, the one having a built-in arithmetic processing unit is connected to other voltage detectors by wiring (not shown). The arithmetic processing unit uses four currents detected by the voltage detectors 30a to 30d as input signals, and outputs one of the alarm generation units 28 built in each voltage detector 30a to 30d as an output signal according to a processing method described later. Alarms.
Here, the arithmetic processing unit is not incorporated in any one of the voltage detectors 30 a to 30 d, but may be independently installed on the surface of the limit collar attachment unit 13, for example. At this time, the arithmetic processing unit is connected to each of the voltage detectors 30a to 30d by wiring (wired or wireless).
As another modified example, a case in which the alarm generation unit 28 is not built in the voltage detectors 30a to 30d and one, for example, is provided separately (not shown) can be considered. Further, the alarm generation unit 28 is installed in a ring shape around the surface of the limit collar 12, and has a total of four light-emitting lamps in the direction corresponding to each of the voltage detectors 30a to 30d. The arithmetic processing unit may be connected by wiring (wired or wireless). Of course, in addition to the light emitting lamp and the lighting switch, it is also possible to provide a vibration generator and a sound generator.

FIG. 4 shows steps S1 to S3, which are calculation processing steps until the current detected by the voltage detectors 30a to 30d becomes an alarm in the alarm generation unit 28.
First, in step S1, the current detected by the voltage detectors 30a to 30d is recognized as an input signal f (n) for each voltage detector. Here, n is a voltage detector number and identifies the voltage detectors 30a to 30d. At this time, since the voltage detectors 30a to 30d are set to detect only the current exceeding the threshold at the safe separation distance 23, the value of the input signal f (n) is zero when not detected. The number n itself is recognized. That is, the detector can be identified even when there is no input signal f (n). Thereafter, the input signal f (n) and the voltage detector number n are sent to the arithmetic processing unit as output signals from the voltage detectors 30a to 30d (from step S1 to step S2).
Next, in step S2, the arithmetic processing unit extracts the maximum value F (N) of the input signal from the output of step S1, and specifies the voltage detector number N that detected this maximum value F (N). Thereafter, the voltage detector number N is transmitted to the alarm generation unit 28 as an output signal from the arithmetic processing unit (from step S2 to step S3).
If the same maximum value F (N) is detected by a plurality of voltage detectors among the voltage detectors 30a to 30d, all the voltage detector numbers N indicating the maximum value F (N) are transmitted to the alarm generation unit 28. It shall be.
And step S3 transmits a signal to the alarm generation part 28 incorporated in the voltage detector corresponding to voltage detector number N among voltage detectors 30a-30d. In addition, when one alarm generation unit 28 is installed outside the voltage detectors 30a to 30d as described above, a signal corresponding to the voltage detector number N is transmitted to correspond to the voltage detector number N. The lighting switch for the light emitting lamp, the vibration generator or the sound generator is operated.
In the present embodiment, the threshold at the safe separation distance 23 is set by the voltage detectors 30a to 30d in step S1, and current is output when the threshold is exceeded. The function is added to the arithmetic processing unit, and the current detectors 30a to 30d always output a current corresponding to the detection, and the current detector number N is output only when the maximum value F (N) exceeds the threshold value in step S2. Of course, the processing may be performed.

Next, the operation of the indirect hot wire working tool 29 according to the third embodiment will be described. In the indirect hot wire working tool 29, since a total of four voltage detectors 30a to 30d are installed at the height of the limit collar mounting portion 13, the operating current value at the safe separation distance 23 is set as a threshold value.
Moreover, since each of the voltage detectors 30a to 30d detects a current independently in each direction and has a built-in alarm generation unit 28 for each voltage detector, an alarm is generated independently in each direction.
The arithmetic processing unit identifies the voltage detector number N that has detected the maximum current value F (N) detected by the voltage detectors 30a to 30d in steps 1 to 3, and the alarm built in the voltage detector corresponding to the voltage detector number N In order to transmit a signal to the generating unit 28, the alarm generating unit 28 that has received this signal generates an alarm. Further, as described above, when one alarm generation unit 28 is installed outside the voltage detectors 30a to 30d, the light-emitting lamp at the position corresponding to the voltage detector number N is turned on according to the operation of the lighting switch. Or a vibration generator and a sound generator operate. Therefore, the direction of existence of the closest live line is indicated. The above is the same even when the voltage detectors 30 a to 30 d are installed on the surface of the insulating rod 8 inside the limit collar 12.
In addition, it has the same action as the indirect hot wire working tool 1 according to the first embodiment.

Furthermore, the effect of the indirect hot wire working tool 29 according to the third embodiment will be described. The indirect hot wire work tool 29 is set to detect only the current exceeding the threshold value at the safe separation distance 23, and the arithmetic processing unit extracts the maximum value F (N). This is not a malfunction due to the above, but is sufficiently reliable.
Further, since the direction of existence of the live line closest to the worker is indicated, the direction of the live line to be separated with the highest priority can be recognized, and danger avoidance can be efficiently performed. And when it approaches abnormally close to the live line in another direction after separating for the first time, since another voltage detection part issues a warning, this can be avoided again.
Also, with respect to the voltage detection means other than the one that outputs the maximum output signal among the output signals, if the existence direction of the live line is informed to the worker for those exceeding the desired set value, these may be used. It is possible to move away from the closest live line while taking into consideration, thus enabling quicker evacuation.
In addition, since there are various variations in the arrangement and number of the voltage detectors 30a to 30d, the alarm generation unit 28, and the arithmetic processing unit, the indirect hot wire working tool 29 having a configuration suitable for the use state can be manufactured. High nature.
In addition, it has the same advantageous effects as the indirect hot wire working tool 1 according to the first embodiment.

  The invention described in claims 1 to 4 can be applied to an indirect hot wire working tool for live wires such as charging electric wires. Moreover, since the threshold value for issuing an alarm can be set to a desired setting value, the present invention can be applied to an indirect hot wire working tool for hot wires such as extra high voltage, high voltage, and low voltage charging electric wires.

  1, 26, 29 ... Indirect hot wire working tool 2 ... Head part 3 ... Base part 4 ... Base part 5 ... Head mounting part 6 ... Base part hinge 7 ... Angle adjustment shaft 8 ... Insulating rod 9, 16 ... Rain cut collar 10 27a to 27d, 30a to 30d ... Voltage detectors 11, 28 ... Alarm generating part 12 ... Limit collar 13 ... Limit collar attachment part 14 ... Grip part 15 ... Auxiliary rod 17 ... Operation lever 18 ... Operation hinge 19 ... Operation shaft 20 ... Workers 21a, 21b, 21c ... Charging wire 22 ... Pole 23 ... Safe separation distance 24,25 ... Distance between charging wire voltage detectors

Claims (4)

An indirect hot wire work tool used in indirect hot wire work,
An insulating rod provided at the upper end with a head portion that is in contact with the live wire, and a grip portion having a limit collar on the upper portion;
A voltage detector that is installed so as to contact the limit collar, or is installed on an insulating rod inside the limit collar, and that detects a charged state of the live wire in a non-contact manner and transmits an output signal;
An indirect hot wire working tool comprising: an alarm generation unit that receives an output signal transmitted from the voltage detection unit and issues an alarm with light or sound when a desired set value is exceeded. The head portion includes a movable portion that grips the live line,
The indirect hot wire working tool according to claim 1, further comprising an auxiliary rod having an upper end connected to the movable part and an lower end connected to an operation lever attached to the grip part so as to be opened and closed. .   A plurality of the voltage detection units are installed at different positions in the circumferential direction of the insulating rod, the alarm generation unit individually receives output signals from the plurality of voltage detection units, and any one of the output signals is desired. 3. The indirect hot wire working tool according to claim 1, wherein when the set value is exceeded, an alarm is issued with light or sound to detect a charged state of the live wire in a circumferential direction. The voltage detector includes a plurality of voltage detectors attached at different positions in the circumferential direction of the insulating rod,
An arithmetic processing unit that receives each output signal of the plurality of voltage detection means,
The arithmetic processing unit extracts a maximum output signal from the output signals of the plurality of power detection means, identifies the power detection means that has output the maximum output signal, and adds position information to the maximum output signal. Outgoing,
The alarm generation unit receives the maximum output signal of the arithmetic processing unit and issues an alarm with light or sound including the position information when a desired set value is exceeded. Item 3. The indirect hot wire working tool according to Item 2.