JPH0738099U - Safety device for working equipment for live lines - Google Patents

Abstract

(57) [Abstract] [Purpose] In a live-line working device, a live-line work can be performed while the insulation between the working means and the conductive boom member is ensured. [Structure] In this safety device, first, live line detection means 33
When it is detected that the strength of the electric field caused by the hot line C is equal to or higher than the predetermined strength stored in advance, it is determined that the working means 5, 25 is on the verge of performing hot line work. R. And in this state,
When the extension amount of the insulating boom members 13 and 22 detected by the extension amount detecting means 31 and 32 is less than or equal to a predetermined extension amount stored in advance, the working means and the conductive boom member 12,
Assuming that the insulation between 21 is incomplete, an alarm is activated by the alarm means.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety device for a working device for a live wire used for performing work on a live wire (an electric wire that is in a conducting state).

[0002]

[Prior art]

 As an example of the above-mentioned live-line work device, a live-line work manipulator vehicle is used. The main telescopic boom that can be raised and lowered is attached to the body of this manipulator vehicle. The main telescopic boom is constructed by inserting an electrically insulating boom member made of glass fiber or the like into a telescopic shape into a telescopic boom member made of steel or the like. At the tip of the electrically insulating boom member, a working means consisting of a working cabin for an operator to board and a manipulator slave arm is attached, and the live wire working means is mounted from the vehicle body / ground side by this electrically insulating boom member. It is electrically isolated.

A worker can board the work cabin, and the worker controls the operation of the slave arm through the operation of the master arm mounted in the cabin, so that the worker can safely operate without directly touching the live line. Can perform live work. In order to improve work efficiency, a sub telescopic boom (which has the same structure as the main telescopic boom) that can be expanded and contracted in the horizontal direction is attached to the work cabin, and a slave arm is attached to the tip of this sub telescopic boom. is there.

[0004]

[Problems to be solved by the device]

 However, if the electrically insulating boom member extends with respect to the conductive boom member and the working means (slave arm for the sub telescopic boom) is not separated from the conductive boom member to some extent, the insulation between the two will not occur. There is a problem that the worker who gets in the work cabin may get an electric shock when the slave arm touches the live line without being secured. In the past, a mark was attached to the outer surface of the electrically insulating boom member to indicate that the required amount of extension was reached, and the work was carried out only when the mark was visible to the outside. It lacked certainty, such as forgetting to confirm.

The present invention has been made in view of the above problems, and is a safety device for a hot wire working device that enables hot wire work while ensuring insulation between the working means and the conductive boom member. Is intended to provide.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the safety device of the present invention is attached to a working means and detects a strength of an electric field or a magnetic field caused by an electric current flowing through an electric wire, and a live-insulating boom member. The extension amount detecting means for detecting the extension amount with respect to the conductive boom member, and the strength of the electric field or magnetic field detected by the hot line detecting means is equal to or higher than a predetermined strength, and the extension amount detecting means detects the extension amount. It is composed of a controller that outputs an alarm signal when the extension amount is less than or equal to a predetermined extension amount, and an alarm unit that receives the alarm signal and performs an alarm operation.

[0007]

[Action]

 In such a safety device, first, when the strength of the electric field or the magnetic field detected by the hot-line detecting means is equal to or higher than a predetermined strength stored in the controller in advance, the working means is set to a state just before performing hot-line work. It is judged that there is. In this state, when the extension amount detected by the extension amount detecting means is equal to or less than the predetermined extension amount stored in the controller in advance, it is judged that the insulation between the working means and the conductive boom member is incomplete, and the controller is judged to be incomplete. An alarm signal is output from the device, and an alarm is activated by the alarm means. The term "alarm activation" as used herein means to issue an alarm using an alarm buzzer, an alarm lamp, or the like, or to stop the operation of the working means to issue an alarm.

[0008]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a live-line manipulator vehicle (a live-line work device) equipped with a safety device according to the present invention. The manipulator vehicle 1 is constructed with a truck as a base, and a swivel base 3 that is capable of horizontally swiveling with respect to the vehicle body 2 is attached to a front portion of the vehicle body 2. A main telescopic boom 10 is attached to the upper part of the swivel base 3. The main telescopic boom 10 has a main base boom 11 whose base end is pivotally attached to the swivel base 3 so as to be up and down, and a main intermediate boom 12 inserted in the main base boom 11 so as to be movable in the longitudinal direction. And a main tip boom 13 that is movably inserted in the main intermediate boom 12 in the longitudinal direction, and is telescopically extendable.

Here, the main base end boom 11 and the main intermediate boom 12 are conductive boom members formed of a conductive material such as steel and having a rectangular hollow cross section. On the other hand, the main tip boom 13 is an insulating boom member having a rectangular hollow section formed of an electrically insulating material such as glass fiber. A hoisting cylinder 4 operated by hydraulic pressure is attached between the main base end boom 11 and the swivel base 3, and the main telescopic boom 10 is hoisted and driven by the telescopic operation of the hoisting cylinder 4. Further, the main telescopic boom 10 has a telescopic cylinder (not shown) that operates by hydraulic pressure built therein, and the main intermediate boom 12 and the main tip boom 13 are moved in the telescopic direction by the telescopic operation of the telescopic cylinder. .

A working device 5 is attached to the tip of the main tip boom 13. This working device 5 is composed of a work cabin 15 and a manipulator slave arm 25. The work cabin 15 is attached to the tip of the main tip boom 13 so as to be vertically swingable, and is vertically swung according to the up-and-down state of the main telescopic boom 10 by a leveling cylinder (not shown), and is always maintained horizontally. . A seat for the worker M to sit on and an operation device (neither shown) such as a master arm operated by the worker M are attached to the inside of the work cabin 15.

A sub telescopic boom 20 is attached to the outside of the work cabin 15. The sub telescopic boom 20 extends in the front-rear direction on both side surfaces of the work cabin 15 and is attached to the sub base end boom 21. The sub base end boom 21 is freely inserted in the sub base end boom 21 in the longitudinal direction. It is configured to telescopically extend and retract from the sub tip boom 22. The sub telescopic boom 20 contains a sub telescopic cylinder (not shown) that operates by hydraulic pressure, and the sub tip boom 22 is moved in the telescopic direction by the telescopic operation of the sub telescopic cylinder.

A manipulator slave arm 25 is attached to the tip of the sub tip boom 22. The slave arm 25 is composed of an articulated arm section 25a and a hand section 25b attached to the tip of the articulated arm section 25a. The slave arm 25 operates so as to follow the movement (operation) of the master arm.

The manipulator vehicle 1 is equipped with a safety device 30 shown in FIG. The safety device 30 includes a main boom extension amount detector 31, a sub boom extension amount detector 32, an electric field detector (hot line detector) 33, a controller 34, and various alarm means 37 to 39. There is. As shown in FIG. 1, the main boom extension amount detector 31 is attached to the main intermediate boom 12, and detects the extension amount Lm of the main tip boom 13 with respect to the main intermediate boom 12. The sub boom extension amount detector 32 is attached to the sub base end boom 21 and detects the extension amount Ls of the sub tip end boom 22 with respect to the sub base end boom 21. The expansion amount detectors 31 and 32 output detection signals (optical signals) corresponding to the detected expansion amounts Lm and Ls. As shown in FIG. 1, the electric field detector 33 is attached to the tip of the sub tip boom 22 and detects the electric field strength around this, and outputs a detection signal (optical signal) corresponding to the electric field strength. .

The controller 34 includes a judging device 35 and a relay switch 36. The determiner 35 determines whether or not the extension amounts Lm and Ls indicated by the detection signals received from the main boom extension amount detector 31 and the sub boom extension amount detector 32 exceed a preset predetermined extension amount. The judgment device 35 does not output any signal when it judges that it exceeds the predetermined expansion amount, and outputs an alarm signal through the warning signal line 1w when it judges that it is below the predetermined expansion amount. .

The relay switch 36 is composed of a relay coil 36a and an open / close switch 36b. The detection signal from the electric field detector 33 is converted into an electric signal and input to the relay coil 36a to excite it. The open / close switch 36b is attached in the middle of the alarm signal line 1w, and when the relay coil 36a is in the non-excited state, it is located in the open position to shut off the alarm signal line 1w, while the relay coil 36a has a predetermined value or more. When it is excited by the detection signal of, the alarm signal line 1w is opened at the closed position. Here, the predetermined value is set to, for example, a signal value corresponding to the electric field strength detected at a position within 80 cm from the electric wire C when 6,600 volt electricity is flowing through the electric wire C. It is changed according to the voltage flowing through C

The alarm means is composed of an alarm buzzer 37, an alarm lamp 38, and a slave arm restrictor 39, all of which are connected to the alarm signal line 1w. The alarm buzzer 37 receiving the alarm signal from the alarm signal line l w emits an alarm sound, and the alarm lamp 38 receiving the alarm signal blinks. Further, the slave arm regulator 39 that has received the alarm signal forcibly stops the operation of the slave arm 25 regardless of the operation of the master arm. The alarm means 37 to 39 may be used in combination as shown in FIG. 2, or any one of them may be used alone.

The manipulator vehicle 1 configured as described above is installed on the ground near the utility pole D by using the jacks 6 attached to the front, rear, left and right of the vehicle body 2. The operator M who has boarded in the work cabin 15 operates the internal operation device to control the operations of the swivel base 3 and the main telescopic boom 10 to ascend to the upper part of the electric pole D and the operation of the sub telescopic boom 20. The slave arm 25 is controlled to approach the electric wire C 1 hung on the upper part of the electric pole D. The electric wire C is an electric wire that is in an energized state, that is, a live wire, and as shown in FIG. 3, an electric field E is formed by a current flowing through the electric wire C.

At this time, the extension amount detected by the extension amount detectors 31 and 32 of the main tip boom 13 or the sub tip boom 22 is equal to or less than the predetermined extension amount, and the slave arm 25 approaches the power line C, so that the predetermined extension force is exceeded. When the electric field E equal to or more than the above is detected (that is, when the live-line work is about to be performed as shown in FIG. 3), an alarm signal is output from the determiner 35 and the alarm signal line 1w is output. The alarm means 37 to 39 are activated to open the communication. As a result, it is possible to prevent live-line work in a state where electrical insulation from the vehicle body 2 and the slave arm 25 of the work cabin 15 is incomplete, and it is possible to reliably prevent an electric shock accident of the worker M. . On the other hand, when the detected extension amounts of the main tip boom 13 and the sub tip boom 22 are equal to or more than the predetermined extension amount, the alarm means 37 to 39 do not operate, and therefore the worker M operates the master arm to operate the slave arm. It is possible to perform the live-line work via the slave arm 25 by controlling the operation of the frame 25 and without directly touching the electric wire C.

After the work is completed, the main tip boom 13 or the sub tip boom 22 is reduced to a predetermined extension amount or less, and the slave arm 25 is separated from the electric wire C by a predetermined distance or more. Although it is output, since the detection signal is not output from the electric field detector 33, the alarm signal line 1w is cut off and the alarm means 37 to 39 do not operate. Therefore, the worker M can store the slave arm 25 in the work cabin 15 by operating the master arm.

Although the electric field detector is used as the live line detecting means in the above embodiment, the safety device according to the present invention uses a magnetic field detector for detecting the strength of the magnetic field caused by the current flowing through the electric wire. May be.

[0021]

[Effect of device]

 As described above, the safety device of the present invention activates the alarm when the extension amount of the telescopic boom is insufficient to secure the insulation when the work means is in the state of being on the verge of performing live work. I do. Therefore, if this safety device is used, it is possible to secure the insulation between the working means and the conductive boom member without relying on the visual confirmation by the operator, and it is possible for an operator, etc., who has boarded the live-line working means to do so. It is possible to prevent electric shock accidents.

[Brief description of drawings]

FIG. 1 is a side view of a manipulator vehicle equipped with a safety device according to the present invention.

FIG. 2 is a configuration diagram of the safety device.

FIG. 3 is an operation explanatory view of the safety device.

[Explanation of symbols]

 10,20 Telescopic boom 11,12,21 Conductive boom member 13,22 Insulating boom member 5 Working device 15 Working cabin 25 Manipulator slave arm C Live wire

Claims (1)

[Scope of utility model registration request] 1. An extendable boom, wherein an electrically insulating boom member is inserted into a conductive boom member so as to be movable in an extendable direction.
A safety device of a working device for a live wire, which is attached to the tip of the electrically insulating boom member, and which comprises a working means for working on an electric wire in a live state, the safety device being attached to the working means. Live line detecting means for detecting strength of an electric field or magnetic field caused by a current flowing through the electric wire; extension amount detecting means for detecting an extension amount of the electrically insulating boom member with respect to the conductive boom member; A controller that outputs an alarm signal when the strength of the electric field or magnetic field detected by the detection means is equal to or higher than a predetermined strength and the extension amount detected by the extension amount detection means is equal to or less than a predetermined extension amount. A safety device for a hot-line working device, comprising: an alarm unit that receives the alarm signal and performs an alarm operation.