JPS5845376B2 - Human voice sensing agricultural machine accident prevention method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and device for preventing accidents in agricultural work by detecting human voices, and in particular, a microphone is installed in an agricultural machine, and while the microphone is collecting sounds, specific human voice sounds can be detected by the microphone during work. When detected, an electronic circuit is activated to automatically stop the prime mover of the agricultural machine, thereby preventing accidents involving the agricultural machine.

As is well known, with the progress of agricultural mechanization, various types of agricultural machinery have appeared, and along with the trend toward increased horsepower and larger sizes, the number of accidents caused by agricultural machinery is increasing year by year, and there is a strong demand for countermeasures.

In order to meet this demand, various measures have been taken, such as attaching safety covers to dangerous parts, but the reality is that they have not always been effective.

By the way, when investigating accidents involving agricultural machinery, it was found that when a tractor is in danger, the driver of the tractor may say things like "danger,""I'm in trouble,""helpme," and other human voices that don't have any particular meaning. It can be seen that there are many cases where accidents occur because farmers continued work without realizing it, were unable to stop the prime mover of agricultural machinery immediately even if they heard the voice, or were delayed in stopping the equipment.

In other words, an effective means for preventing accidents involving agricultural machinery is to first stop the prime mover, such as a tractor, in the event of a danger.

Therefore, the inventor investigated the frequencies of human voices as mentioned above, and found that most of them ranged from 500 hertz to 1,000 hertz.
I learned that it is distributed around hertz, with the center frequency around 750 hertz being the most common.

Then, this frequency is discriminated and separated from the noise frequency of tractors and agricultural machinery using an electronic circuit, and based on the signal output, the prime mover of the agricultural machinery is automatically stopped immediately when the above-mentioned human voice sound is emitted. This invention is believed to be extremely effective in preventing accidents involving agricultural machinery, and the present invention has been made with the aim of providing a method and apparatus for the same.

In other words, the gist is that when agricultural work is carried out while collecting sound with a microphone installed on an agricultural machine, and a specific person's voice enters the sound collected by the microphone, the electronic circuit connected to the microphone detects that specific person's voice. This system discriminates the frequency of the voice sound, activates the operation relay based on the differentiated signal output, and connects the solenoid relay attached to the power source stop device of the agricultural machine to the power source and operates it, thereby stopping the prime mover of the agricultural machine.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

Figure 1 shows a tractor T with the cockpit covered by a safety frame T1.
This figure schematically shows an embodiment in which an agricultural machine such as a potato harvester (not shown) is connected via a traction rod T2.

In FIG. 1, reference numeral 2 denotes a human voice discrimination actuating device, which will be described in detail later, and is attached to the front end of the safety frame T1 at a position where the operator can easily see it.

Reference numerals 1 and 1 designate microphones, and an appropriate number of microphones are connected to the human voice discrimination actuating device 2 via a microphone cord 6, depending on the size of the agricultural working machine, and are arranged at appropriate locations on the agricultural working machine.

For example, in a potato harvester, it may be installed near the sorting conveyor where accidents are likely to occur.

E is the prime mover of the tractor T, and DC is a dynamo rotated by the prime mover E.

Reference numeral 4 denotes a prime mover stop device for the prime mover E, which corresponds to a known fuel control device for a fuel injection pump or an engine decompression device.

3 is a solenoid relay equipped with a movable core inside, and is fixedly installed near the prime mover stop device 4.

T is a lead wire that connects the human voice discrimination operating device 2 and the dynamo DC, 8 is a lead wire that connects the battery BT and the human voice discrimination operating device 2, and 9 is also a lead wire that connects the battery BT and the solenoid relay 3.

3A is a connecting means that connects the solenoid relay 3 and the prime mover stop device 4, and is provided so that the iron core operation of the solenoid relay 3 is transmitted to the prime mover stop device 4 (the prime mover E) to stop the prime mover E. So that there is no hindrance,
Use something that can be expanded and contracted, such as a chain or wire.

5 is an emergency buzzer device, with battery BT and lead wire 1
1, and is also connected to a dynamo DC via a human voice discrimination actuating device 2 via a lead wire 10.

Note that two device inventions were constructed depending on the presence or absence of the above-mentioned emergency buzzer device 5.

Next, the human voice discrimination actuating device 2 consists of each block indicated by a dashed line in the electronic circuit shown in FIG. 2c
, frequency discriminator 2d, low frequency voltage amplifier 2es step-up transformer 2f, (step-up 1:15), detector 2g, power amplifier 2h, operation relay 2j, 2k, 2-contact 2-circuit switch 2
m, and pilot lamp PL1 and test lamp PL.
2. Diode D3, choke coil CL.

A Zener diode D4 and a capacitor 32 were connected as shown in the figure.

The operating relay 2j closes the contacts of the solenoid LR1 using the output of the power amplifier 2h, and causes current to flow through the solenoid LR2, thereby closing the contacts of the operating relay 2.

Operation relay 2j. The operation hold time for 2 is capacitor C31.
Adjust the capacity.

Normally, even considering the inertia effect of the agricultural machine, the operation holding time should be about 1.5 seconds.

In addition, the pilot lamp PLI is blue and the test lamp P
L2 was red.

The prefixes in the diagram are VR, variable resistance, R, resistance, and C.
is a capacitor, D is a diode, LR is a solenoid, T
R represents a transistor, and L represents an inductance.

Furthermore, although the illustrated frequency discriminator 2d is of the LC type, a CR type or NF type may be used instead.

Furthermore, if the circuit before the detector 2g is made into a microcomputer circuit, although the price will be higher, in this case the computer will memorize a specific word and the device will operate only in response to that word.

Next, the emergency buzzer device 5 will be explained. It includes one circuit of a two-contact two-circuit switch 2m, and a lead wire 11. The hot wire flasher switch 5b, emergency buzzer 5C% lead wire 12, operation relay 5as lead wire 10, human voice discrimination actuation device 2, lead wire 7, and dynamo DC are connected as shown in Fig. 2 to form a circuit. .

The contact of the operating relay 5a is opened by the solenoid LR4 when receiving current from the dynamo DC, but the contact is closed when the dynamo DC stops.

Although FIG. 1 shows the case where the emergency buzzer 5c is attached to the tractor T, it may also be attached to a towed agricultural machine, in which case the lead wires 10 and 11 may be extended.

FIG. 3 is a plan view schematically showing the external appearance of the human voice discrimination actuating device 2, and K is a cabinet that houses the circuit included in the human voice discrimination actuating device 2 explained in FIG. 2 and is sufficiently waterproofed. .

K1 is a dial with a notch, and is provided so that the volume control device 2a can be adjusted.

K2 is a 2-contact 2-circuit switch 2m on/off lever, K3
is a mounting bracket, and PLI and PL2 are the previously mentioned pilot lamp and test lamp, respectively.

W is the electric wire section where the microphone cord 6 and lead wires 7 to 11 are gathered (10.11 if there is no emergency buzzer device 5)
is not used).

In addition, the above-mentioned microphone 1 uses a condenser microphone with a good S/N ratio, and the solenoid relay 3 has a capacity of 12V.
The emergency buzzer 5c used was one with a volume of 110 amps.

The above explanation has been given for a tractor-pulled work machine, but the present invention can be applied to a machine such as a self-propelled combine harvester, which is equipped with a prime mover, a prime mover stop device, a dynamo, and a battery, in the same manner as in the case of the tractor described above. equipment can be installed.

Of course, the present invention can also be applied to an indoor working machine equipped with a prime mover.

Next, the usage and operation of the present invention will be explained.

First, manually turn off the on/off lever of the 2-contact 2-circuit switch 2m, and then start the engine E.

Then, the dynamo DC rotates, current flows through the human voice discrimination actuating device 21, and the pilot lamp PL1 lights up.

This lighting indicates that current is flowing through the human voice discrimination actuating device 2, but since it is necessary to confirm the lighting during work, the human voice discrimination actuating device 2 is installed in a position where it can be easily seen.

The red test lamp PL turns on when the young engine E starts.
2 lights up, the operating relay 2j
, 2k is shown to have operated.

This means that if the on-off lever is set to 2, the prime mover E will stop even with the sound of the tractor, as will be seen later, so set the notched dial to 1 so that the test lamp PL2 will extinguish the smoke. adjust.

Next, as a rehearsal, I put "Dangerous" and "Danger" on Microphone 1.
Add a voice such as "Help me" and watch the test lamp PL2.
Lights up to indicate that the device is operational.

At this time, it is confirmed that the test lamp PL2 does not light up during normal conversation.

If the light turns on in this case, adjust the notched dial to 1 to turn it off.

In other words, by this operation, a state is obtained in which the prime mover E does not stop due to engine noise or agricultural machine noise.

If test lamp PL2.2 contact 2 circuit switch 2m
If this is not done, the prime mover E may stop due to the sound of the prime mover before the adjustment of 1 on the notched dial is completed, so the prime mover E must be started each time it stops, and the human voice discrimination actuating device 2. Adjustment becomes complicated.

Normally, once you adjust 1 on the notched dial, there is no need to readjust it unless there is a significant change in volume.

Next, when the above-mentioned adjustment is completed, turn the on-off lever 2 to turn the 2-contact 2-circuit switch 2m on.

In this way, when farm work is started, all the sounds of the work are collected by the microphones 1 and 1.

When a voice such as ``dangerous'' or ``difficult'' comes into microphone 1 during work, it acts like the electronic circuit switch explained in Figure 2.

In other words, all the sounds collected by microphone 1 are
The ALC circuit 2b controls the volume level through the volume control resistor 2a.
Regardless of this, the volume is leveled to a constant level.

Next, the low-frequency voltage amplifier 2c voltage-amplifies the attenuation in the circuit, and the frequency discriminator 2d separates all the voltage-amplified sounds into the human voice and the noise of agricultural machinery.

According to a known experiment, it is known that the center frequency of the octave band of tractor noise is distributed from about 30 hertz to s, o o o hertz, and the maximum value is around 125 hertz, which is similar to the frequency of the specific human voice mentioned above. If there is a difference and the volume of the specific human voice is sufficient, frequency discrimination will be performed.

FIG. 4 schematically shows this state, where a is the noise from agricultural machinery and the like, and b is the waveform of the discriminated specific human voice such as the above-mentioned "dangerous" sound.

Next, from this separated frequency of about 500 Hz, 1,
A low frequency power amplifier 2e amplifies the power of the sound between 000 Hz and the output voltage is further boosted to 1:15 by a step-up transformer.

The boosted signal AC voltage is detected by the diode Di of the detector 2g.
, D2 performs full-wave rectification and detects the DC voltage.

Next, the DC voltage is power amplified by a power amplifier 2h, and the power operates the solenoid LR1 to close the operating relay 2j, and current flows to the solenoid LR2 to close the operating relay 2k.

When operation relay 2k closes, 2 contacts 2 are released from battery BT.
Current flows through the solenoid relay 3 through the circuit switch 2m, and the coil core is activated.

The operation is transmitted to the prime mover stopping device 4 through the connecting means 3A, and the prime mover 4 is stopped.

The functions described above are performed by electronic circuits, so
This occurs immediately when the human voice enters the microphone 1.

Furthermore, in the case of the emergency buzzer device 5, since the dynamo D'C also stops at the same time as the prime mover E stops, the operating relay 5a, which had been opened by the current of the dynamo DC, closes due to the bias of the spring, and the batch 2 from IJBT
Contact 2 circuit switch 2m, hot wire flasher switch 5b
, the emergency buzzer 5c, and the operation relay 5a, and the emergency buzzer 5c intermittently sounds due to the bimetal contact opening/closing action of the hot-wire flasher switch 5b.

As explained above, according to the present invention, "
As long as you say something like "Danger," the prime mover of the farm machine will stop quickly and without the need for any other operations, preventing accidents involving the farm machine. If the prime mover stops due to a call for help when working alone, the operator cannot leave the agricultural machine alone and call for rescue, which may delay rescue and cause a serious accident. The emergency buzzer starts sounding as soon as the prime mover stops, and continues beeping as long as the battery is available to call for rescue, thereby preventing the accident from spreading.

Also, if you only check that the pilot lamp of the human voice discrimination activation device lights up in blue during work, it is guaranteed that the device will work, so there is no need to perform any operations during the process, and you can continue farming as usual. be able to.

As shown in Figure 2, the device's electronic circuit uses IC integrated circuits, diodes, transistors, etc., so it has sufficient durability against the vibrations often seen in agricultural work.
The device can be made compact, and once set on the work machine, adjustment can be done by simply operating the on/off lever and the notched dial. Moreover, even while adjusting the notched dial, the test can be performed as mentioned above. ] - Since a lamp is provided, it is possible to avoid the complication of the prime mover stopping during adjustment.

Moreover, when installing the device of the present invention, the main tasks are to install the microphone and the human voice discrimination operating device.
Installation, such as when attaching a safety cover, has almost no mechanical restrictions, and can be applied to a wide range of models.

Of course, this does not hinder the attachment of conventional safety covers, and when used in conjunction with the present invention, it can be even more effective in preventing accidents with agricultural machinery.

As described above, the present invention makes it possible to effectively prevent accidents with agricultural machinery from a completely new field that has not been seen before, and the safety effects obtained in agricultural work are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a tractor embodying the present invention;
The figure is a diagram of an electronic circuit implemented in the device of the present invention, Figure 3 is a schematic front view of a cabinet housing a part of the electronic circuit of Figure 2, and Figure 4 shows the frequency discrimination effect in the electronic circuit of Figure 2. It is a waveform diagram shown typically. 1...Microphone, 2...Human voice discrimination actuation device, 3...Solenoid relay, 4...
...Motor stop device, 5...Emergency buzzer device,
6...Microphone cord, BT...Battery, DC...Dynamo, E...Motor, 2J, 2k...Operation relay, K・・・・・・Cabinet.

Claims (1)

[Scope of Claims] 1 A farm machine (a farm machine) performs farm work while collecting sound with a microphone installed therein, and when a specific human voice enters the sound collected by the microphone, an electronic circuit connected to the microphone detects the specific human voice. A human voice characterized by discriminating the frequency of the signal, activating an operation relay based on the discriminated signal output, and connecting a solenoid relay attached to a power source stop device of the agricultural machine to a power source and activating it to stop the prime mover of the agricultural machine. Sensory agricultural work accident prevention method. 2 A microphone is installed at an appropriate location on the agricultural machine, a specific human voice is extracted as a signal by frequency discrimination from the sound collected by this microphone, and this signal is further power-amplified and output as an operation relay. A human voice discrimination actuating device equipped with an electronic circuit that operates the human voice discrimination actuating device is connected to a DC power source through a relay operation of the human voice discrimination actuating device, and the power source of the agricultural working machine is stopped by its operation to a prime mover stop device of the agricultural working machine. A human voice sensing agricultural work-like accident prevention device characterized by having a solenoid relay mounted in a manner similar to the above. A human voice discrimination actuating device is equipped with an electronic circuit that extracts the signal as a signal, and operates a relay with the power amplified output of this signal, and conducts it to a DC power source through the relay operation of this human voice discrimination actuating device. A solenoid relay is installed in the prime mover stop device of the machine so as to stop the electric motor of the agricultural machine when activated, and between the dynamo rotated by the prime mover and the DC power supply, when the dynamo is stopped, DC current is generated via the operating relay. A human voice sensing agricultural work-like accident prevention device characterized by comprising an emergency buzzer device connected to a power source.