JPH03230710A - Alarm device for work adjacent to high tension cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an alarm device for ensuring a distance between high voltage lines when work such as lifting a load is performed adjacent to the high voltage lines.

(Prior art) When carrying out work such as lifting loads using a crane, tow truck, etc. under high-voltage lines, it is necessary to maintain a predetermined distance from the high-voltage lines so that the boom, etc. does not come into contact with the high-voltage lines. .

Conventionally, the method of maintaining such a separation distance is as follows.

■ A method in which a protective net is laid out at a predetermined distance from the high-voltage line, corresponding to the boom operating area of the crane or tow truck. Securing the separation distance between lines - Y method ■Equip a watchman and keep a watch i
i (7) [] There is a method of keeping distance from high voltage lines by visual inspection.

(Problem to be determined or solved) However, in the above-mentioned method (2), there is a problem that when the 1st voltage line is located at a high place, it becomes difficult to install a protective net and the cost increases.

In addition, with the method described in iii), if the operator is so focused on work that he neglects to monitor the condition of the reference lobe, the boom may enter the distance and come into contact with the high-voltage line, causing the high-voltage line to be severed. There is a risk that it will not be possible to ensure the safety of the essay.

Therefore, when hoisting a load by extending and retracting the boom, as in a shi-tsuka, the maximum extension of the boom must be regulated at a constant level in order to ensure the separation distance using the standard lobe.

Furthermore, in the method of ■■ above, the fi
In order to judge the separation distance, the ell fixed distance fi is used, and there is a difference between two individuals, so accurate distance judgment cannot be expected. Therefore, it is necessary to provide a wide distance between the high-voltage lines, which unnecessarily limits the writing area of the wrecker and crane. In addition, there was a problem in that the workers could not be kept under close watch during the work, which increased labor costs.

The present invention was devised in view of the above-mentioned points, and it is possible to perform work adjacent to high voltage lines that does not require one person's work (it is possible to reliably and stably maintain the separation distance between high voltage lines and improve work safety). The purpose is to provide a single reporting device.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention will be explained in conjunction with FIG. 1 showing one embodiment. at least one infrared emitter 5.6 for monitoring a work object; and the infrared emitters 5, 6.
from the high voltage line in the light beam irradiation direction of
A light receiver 7.8 is arranged at a distance and receives the light beam from the infrared light emitters 5, 6, and based on the output signals of the light receivers 7, 8, +iii. A determination circuit 16 that determines whether the beam is continuously or temporarily interrupted by a work object under the high voltage line 1 and sends a signal when it is determined that the beam has been interrupted, and operates based on the output No from the determination circuit 16. 1 alarm control circuit 17 and the alarm i
ll @ circuit 17 to notify that a work object has entered within the separation distance.

(Function) The light beams B, , B, irradiated from the infrared emitters 5, 6 to the receiver 7.8 are continuously or temporarily interrupted by a work object operating in close proximity to the high voltage line 1. Then, the determination circuit 16 determines whether the light beam is interrupted and the g-information control circuit 1
The output signal is sent to 7.

This activates the alarm control circuit 17 to drive the notification means to automatically notify that the work object has entered within the separation distance of the high voltage line.

It is possible to reliably and stably secure the separation distance between high-voltage lines without requiring manual labor, and it also improves work safety.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an overall configuration diagram showing an example in which the i-report system according to the present invention is applied to a tow truck lifting a load under a high-voltage line.

In the figure, ■ indicates a high-voltage line that constitutes an overhead power transmission line, and as shown in Fig. 2, supports 1a such as a steel tower.

1a. Further, reference numeral 2 denotes a working machine, such as a tow truck, which performs work such as front lifting under the high-voltage line 1.

High pressure # equivalent to the work area of Wrecker 2! 1, as shown in FIGS. 1 and 2, there are pairs of panzer masts 3a, 3b and 4a, 4 located on both sides of the high-pressure ill.
b are installed upright at a predetermined distance apart from the high voltage line l in the longitudinal direction.

An infrared emitter 5 is provided at the upper end of the panza masts 3a and 4a.
, 6 are attached to each of the light emitters 5, 6.
The infrared beams B, , B, emitted from the infrared beams B, , B, are directed to the corresponding masts 3 b, 4 b and directed toward the water beams.

Also, the valley panzer mast 3b in the irradiation direction.

A light receiver 7.8 is attached to the upper end of 4b for receiving the infrared beam emitted from each light emitter 5,6.

Incidentally, the level (height) of the infrared beams B, , B2 corresponds to the separation distance of the high voltage line l, and the infrared beams B, , B2
This makes it possible to limit the working height of the tow truck 2 below the high voltage line.

Furthermore, a WIIi1 buzzer 9 and a red revolving light IO are respectively attached to at least one van the mast 3a to inform the tow truck operator that the boom of the tow truck 2 has entered within the separation distance of the high voltage line 1.

In FIG. 1, reference numeral 11 denotes a light emitter drive circuit including an oscillator 11a and the like, to which an infrared light emitter 5.6 is connected.

From this drive circuit 11, to each infrared emitter 5, 6,
A drive signal of a predetermined frequency is supplied so that a modulated infrared beam B, , B2 is transmitted from each emitter 5.6 to a respective receiver 7.8.

Filters 14 and 15 are connected to the photodetectors 7 and 8 via amplifiers 12 and 13 that amplify their respective output signals. This filter 14.15 has a corresponding light emitter 5,
Filter 1 passes only the optical signal frequency of 6.
The signal passing through 4.15 is input to the determination circuit 16.

The determination circuit 16 determines whether the boom of the tow truck 2 or the like is an infrared beam B1 based on the received signal that has passed through the filter 14.15.
or B2, and if it is determined that at least one of the infrared beams B and 82 is blocked or temporarily blocked, an output signal is output to the alarm control circuit 17.

The alarm control circuit 17 receives the output signal from the determination circuit 16 and activates the relay 18 at a predetermined time (20 to 60 seconds).
) This is to maintain the biased state.

Normally open contacts 4.18a and 18b of J-Ray 18 are alarm buzzers connected to AC power supply 19 (AC250V, 3A)! They are connected in series to the power supply circuits of the J and red circuit pairs 10, respectively.

The red revolving light 10 is composed of a red lamp lOa and a motor lOb that rotates the red lamp lOa.

Next, the operation of this embodiment configured as described above will be explained.

First, when a drive signal from the drive circuit 11 is supplied to the light emitters 5 and 6, infrared beams B, B2 modulated to a predetermined frequency are emitted from the light emitters 5 and 6 in the direction of the light receivers 7 and 8. Ru.

With this, you can set the separation distance of the high-voltage line l for work under the high-voltage line, and work on the high-voltage line l! Set up a net.

On the other hand, the receivers 7, which received the infrared beams B, , B2,
8 converts the optical signal into an electrical signal and sends each amplifier 1
2.13 The signal amplified by the amplifier 12.13 is inputted to the identification circuit 16 through the filter 14.15, where a predetermined determination process is performed.

That is, the determination circuit 16 converts the signal of a predetermined frequency that has passed through the filter 14.15 into a continuous waveform.
This signal waveform is inverted to Low level by continuous or temporary interruption of infrared beam B1 or B2, and the inversion period is for a predetermined period of time (for example, 1/2 s). c) Determine whether the process continues for a longer time.

Here, the boom 2a of the tow truck 2 is connected to the infrared beams E, B.
2 and without intersecting the infrared beam B or B2, from the receiver 7.8 to the filter 14.1.
Since the signal manually inputted to the judgment circuit 16 through 5 is continuous, the judgment circuit 16 judges that the boom 2a of the tow truck 2 has not entered within the separation distance of the high voltage line 1.
No signal is sent to the g-report control circuit 17.

On the other hand, if the boom 2a of the tow truck 2 during work interrupts the infrared beam B or B2 continuously or temporarily, the determination circuit 16 determines that the boom 2a of the tow truck 2 is within the separation distance of the high voltage line 1. If the signal is too large, r11 is disconnected and an output signal is output to the 1-report control circuit 17.

When the 71 control circuit 17 receives this and operates, the rule 1
8 is maintained in an energized state for a predetermined period of time 1, for example, 20 to 60 seconds.

When relay 18 is biased, its normally open contacts +8a, 1
8b is closed, the alarm buzzer 9 and red revolving light 1
0 is supplied with AC IA power from one AC power supply, the alarm buzzer 9 sounds, and the red revolving light IO rotates while lighting up.

As a result, the boom 2a has entered within the separation distance of the high-voltage line 1, and an i-report is issued to the operator of the tow truck 2, etc., that the boom 2a is in a dangerous state.

Therefore, according to this embodiment, it is possible to constantly monitor the separation distance between the high voltage lines I and ensure the separation distance between the high voltage lines I without requiring any human resources such as watchmen. Safety can also be improved.

In addition, since the tow truck 2 and others are alerted to intrusion into the remote distance through auditory and visual means, they can quickly respond to the intrusion into the remote distance.

In addition, since the infrared beams emitted from the light emitters 5 and 6 are modulated at a predetermined frequency, they are not affected by external light, making it possible to set accurate separation distances. .

In the above embodiment, a case has been described in which a buzzer and a red revolving light are provided at the banzamast, but a red revolving light or the like may also be provided in an office remote from the work site.

Further, in the above embodiment, a case has been described in which the light beams emitted from the infrared emitters 5 and 6 are modulated at a predetermined frequency, but the present invention is not limited to this.

Yet again. In the above example, the tow truck's boom is #l!
Although only the case where one alarm is issued when the tow truck enters within the distance III has been described, it is also possible to automatically stop the operation of the tow truck based on the output signal of the determination circuit 16.

In addition, the arrangement of the infrared emitters and receivers and the means for supporting them in the present invention are not limited to the system of the above embodiments, and the circuit system of the above embodiments for alarm notifications such as buzzers and red circuit lights [stage drive circuits] but not limited to.

(Effects of the Invention) As explained above, according to the present invention, an infrared emitter for monitoring the movement of a work object and a receiver for receiving these potential beams are arranged at a distance away from a high voltage line, and When a work object that operates continuously or temporarily interrupts the light beam, the notification means is activated to notify that a work object has entered within the separation distance. Therefore, the separation distance between the high voltage lines can be constantly monitored without requiring human labor, and the separation distance between the high voltage lines can be ensured reliably and stably, improving work safety.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one practical example of the present invention, and FIG. 2 is a schematic longitudinal view showing the relationship between the high voltage line and the panzer mast in this embodiment.・Bacteria, Domestic l: High pressure 11a, 2;i... Tsuka-13
a. 3b, 4a, 4b are panza masts, 5.6 is an infrared emitter, 7, 8 is a receiver, 9 is a buzzer, 10 is a red rotating light,
11 is a drive circuit, 12 and 13 are amplifiers, 14 and 15 are filters, 16 is a determination circuit, 17 is an alarm control circuit, and 18 is a relay.

Claims (2)

[Claims] (1) at least one infrared emitter for monitoring work objects disposed at a predetermined distance from the high-voltage line, and disposed at a predetermined distance from the high-voltage line in the light beam irradiation direction of the infrared emitter; a light receiver that receives a light beam from an infrared light emitter; and a light receiver that determines whether the light beam from the infrared light emitter is continuously or temporarily blocked by a work object under a high voltage line based on an output signal of the light receiver. , a determination circuit that sends a signal when it determines that the work object has been cut off; an alarm control circuit that is activated by the output signal of the determination circuit; A warning device for work adjacent to a high voltage line, characterized in that it is equipped with a notification means for notifying. (2) The warning device for work adjacent to a high-voltage line according to claim 1, wherein the light beam emitted from the infrared emitter is modulated at a predetermined frequency.