JPH01145579A - Wireless detection-alarm recorder for large number of workers used also as talking device - Google Patents

Abstract

PURPOSE:To improve a safety control and an operation efficiency, by generating an alarm and also recording a helmet number, a time, etc. on the fixed station side when a signal proportional to the amplitude of an alternating current obtained by an electroscope exceeds a certain value. CONSTITUTION:The current of an electroscope AC is given to a rectifier and filter DET and an output thereof is given to a flicker-type alarm sound signal generator F and a modulator MOD. Meanwhile, a signal of a reception antenna ARH is converted into a voice signal by a receiver RH, added up with an output signal of the generator F and emitted to a speaker SP. A signal of the modulator MOD is added up with a signal of a microphone M and transmitted as an electric wave from an antenna ATH through a transmitter TH. An earth E is connected to a pylon through the sole of a shoe or by a lead wire. The present device is all fitted to a helmet together with a power source. In the case when a signal proportional to the amplitude of an alternating current obtained by the electroscope AC exceeds a certain value, an alarm sound is generated and also the number of the helmet, the time and the amplitude of the alternating current are recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention is a voltage detector and a communication device used by tower workers and ground monitors when working in close proximity to live transmission lines.

<Prior Art> Traditionally, communication between tower workers and the ground has been by voice or by transceiver.

In addition, a voltage detector was attached to the end of a rod and was used to check the voltage before starting work.

〈Problems〉〈Technical measures〉 (1) The voltage detection required for live line work is not just a matter of checking the voltage before starting work, and there is no need for instant breaks.

It must be carried out continuously and workers and supervisors must be immediately notified of any danger.

(2) In order to satisfy the above requirements and make one phone call, it is necessary to perform the voltage test and the phone call wirelessly.

(3) It is necessary to record that the work was safe from beginning to end. This is because many dangerous behaviors are overlooked in the shadow of one electric shock accident.

Automatically recording dangerous behavior makes risk management easier.

Technical Issues> In particular, it would be desirable to be small and lightweight, to be able to freely set the alarm point for voltage detection, and to use the same radio frequency for both voltage detection and telephone calls, if possible.

<Example> As shown in Fig. 1, the current of the electrical detection hardware AC is applied to a rectifier/filter DET, and its output is modulated with a flicker (meaning an intermittent signal) type alarm signal generator F. Vessel M
Add to OD.

On the other hand, the signal from the receiving antenna ARH is converted into an audio signal by the receiver RH, added to the output signal from the alarm sound signal generator F, and applied to the speaker SP.

The signal from the modulator MOD is added to the signal from the microphone M, passes through the transmitter TH, and is transmitted as a radio wave from the antenna ATH.

Earth E may combine with one human body, but if possible,
Connect to the tower using the sole of the shoe or lead wire.

All devices shown in Figure 1 shall be attached to the helmet along with a power source. For example, the electrical detection hardware AC is attached to the helmet with an insulator in such a way that it is placed over the outside of the helmet to maintain insulation.

Additionally, the transmitting and receiving frequencies are separate, allowing for simultaneous calls and power detection during calls.

However, if the microphone M does not catch a loud sound above a certain value, and if no alarm is issued at all, transmission is stopped to reduce consumption of the i-cell.

There are various ways to add signals between microphone M and modulator MOD, but in this text, the output of MOD is 3KH2 or more and 10KH.
A V-F conversion method is used in which a frequency higher than the audio band of about 2 or less is used and the frequency changes depending on the amount of human effort. In addition, conversion to a digital signal, AM modulation, and pulse wide modulation methods can also be used.

FIG. 2 is a block diagram of the transmitting side. antenna ARG
The received radio waves are amplified through a high-frequency intermediate RA that amplifies all the radio waves emitted from the helmet side and does not amplify the radio waves of the transmitter TG, and then only the frequency of each helmet is amplified. After passing through receivers R1, R2, R3, . . . for converting into audio signals, the signal from the modulator MOD and the signal from the microphone M in FIG. 1 are separated by a band pass filter BPF and a low pass filter LPF.

The demodulator DM shown in FIG. 2 extracts the voltage indicating the magnitude of the current of the electrical detection metal object, and records this with the recorder RFC1.
and adding it to the audio signal through the alarm sound signal generator F,
Sound is produced by speaker SP.

Connect as many circuits as you need, with the only difference in reception frequency and other features being exactly the same.

At this time, a speaker SP and a recorder such as a typewriter are often shared by all receivers.

Further, the recording device may be a semiconductor memory, a tape, or the like.

The records include the time, helmet number, and the magnitude of the electric current detected by the metal detector. When using tape, audio may also be recorded.

The transmission from the fixed station in Figure 2 to each helmet is as follows.

This is done using the same frequency. That is, the audio signal from the microphone M is transmitted wirelessly through the transmitter TG and the antenna ATG. A block diagram of the alarm sound signal generation nF is shown in FIG.

Next, I will explain invention No. 2. <Prior art><Problems> Technical issues: There are alarms that make intermittent beeping sounds, but when the input voltage is low, the sound comes out momentarily and lasts a long time. As the time rest, the input terminal becomes larger, the ratio of sound intermittent becomes about the same, and for larger input terminal, the time of sound is longer and the time of rest is shorter, and even larger input However, there was no alarm device that could intuitively inform humans of the analog value by emitting continuous sound, replacing the magnitude of the input voltage with changes in the width of the intermittent sound.

This invention provides this.

<Technical means> As shown in Figure 3, subtract the reference value from the input voltage,
This sets the alarm starting point.

Then add this to the integrator. Then, the output voltage of the integrator increases at a rate proportional to the input terminal, and when this value exceeds a certain value, the output of the comparator is inverted, and that value is added to the integrator's power through a constant. The integrator input then begins to decrease, and when this decrease exceeds a certain limit, the comparator inverts.

That is, the comparator also has hysteresis characteristics.

By starting and stopping one oscillator using the output signal of the comparator thus obtained, it is possible to create an alarm device with performance that meets the above-mentioned purpose.

9 inventions 1 again. Let's talk about.

<Effects of the Invention> As described above, according to the present invention, not only can live-line workers of power transmission lines receive continuous power detection and telephone services, but also safety records can be maintained at fixed stations. Since it can be removed, it is effective in terms of safety management and work efficiency, and
Technically, voltage detection and telephone calls are performed using the same radio frequency, making it possible to simplify the equipment.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are block diagrams showing the principle of the present invention. Explanations of symbols are as written in the block diagram. Figure 1 (Demodulator) Figure 2

Claims (1)

[Claims] Invention No. 1: (1) A wireless communication device with a fixed station is attached to each helmet. (2) Attach an electrical detection hardware to each helmet, detect the magnitude of the alternating current obtained by this, and install an alarm that issues an alarm when this exceeds a certain value. (3) Adding a modulation signal that transmits the magnitude of the alternating current obtained by the electrical detection hardware to the audio signal of the microphone. (4) The fixed station side must have a receiver that receives the signals sent from each helmet, and extracts each audio signal and a signal proportional to the magnitude of the alternating current obtained by the detection metal object. (5) The fixed station side shall have an alarm that generates an alarm when a signal proportional to the magnitude of the alternating current obtained by the voltage detection hardware exceeds a certain value. (6) The fixed station side shall have a printing device that records the helmet number, time, and magnitude of alternating current when the alarm sound mentioned in (5) above occurs. A device that uses all of the methods listed in item 6 above to issue an alarm on the results of the voltage test at two locations, a helmet and a fixed station, records the results at the fixed station, and makes a telephone call. Invention 2: A metal object supported by an insulator such as an insulator is attached to the outside of the helmet, and this is connected to the input terminal of a device that outputs a signal when the magnitude of the current exceeds a certain value, and the device is grounded. Voltage detector by connecting the side input terminal to the conductive sole of the shoe. Invention 3: Add the signal obtained by subtracting the reference value from the input signal to the integrator,
An alarm signal generator that adds its output to a comparator, adds the output of the comparator to the input signal of the integrator, and controls the output of the oscillator by the output of the comparator.