RU32196U1 - Wireless underground alarm device and methane volume fraction control in the atmosphere of mine workings - Google Patents

Description

A device for wireless underground alarm and monitoring the volume fraction of methane in the atmosphere of mine workings.

This application for a utility model relates to the mining industry, namely, underground wireless alarm systems and monitoring the presence of methane in underground workings and is intended to organize emergency alerts for miners in underground workings and for individual automatic control of the volume fraction of methane in the atmosphere of mine workings and may be used in coal, mining and chemical industries in order to expand the functionality of the device.

A device is known for wireless accidents of io-geotechnological signaling and communication (RU a.s. 2131515, C1 G E21 C 24), comprising a transmitting set installed on the day surface of the earth, consisting of a reference oscillator, a frequency divider, a power amplifier, and antenna systems connected in series grounding conductors. as well as a control panel, the output of which is connected to the second input of the frequency divider, another output of the control panel is connected to the second 5th input of the power amplifier and, located in the underground workings, a wearable receiving set containing an antenna connected to the input of the selective amplifier, the output of which is connected to the inputs of two, parallel connected frequency mixers. In this case, the second input of the first gel mixture is directly connected to the local oscillator output, and the second input of the frequency mixer is connected to the same local oscillator through a phase shifter. The outputs of both mixers through a low-pass filter each and then through threshold elements are connected to two inputs of a phase detector, the output of which is fed to the input of the command decoder. The output of the command decoder is connected to the speech converter and then through the low-frequency amplifier to the speaker.

However, the solution of the issue of individual emergency alerts in underground mines of coal mines without monitoring the presence of Mciana in the atmosphere of the mine workings does not remove the issue of the safety of working in the coal industry.

2003113667

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IPC E21 C 35/24

18). containing a methane sensor connected to a methane alarm unit, the output of which is connected to a methane concentration meter, powered from a power source common with the receiving device, but through its voltage regulator.

However, resolving the issue of signaling explosive concentrations of methane without signaling a general emergency in the mine does not solve the problem of improving the safety of work in underground workings hazardous for gas and (or) dust.

The purpose of this application for a utility model is to increase the safety of work in underground workings of gas and (or) dust hazardous, which allows to solve, in addition to the issue of individual emergency warning and communication calls, the issue of monitoring the presence of methane in the atmosphere of mine workings in the coal industry, thereby the issue of expanding the functionality of the device.

The technical result of combining two functions, namely, warning and signaling the presence of methane, is to increase the safety of underground work without the use of additional wearable devices of the miner.

This goal is achieved by the fact that the underground wireless alarm device containing a transmitting kit installed on the day surface of the mine, consisting of a reference oscillator, a frequency divider, a power amplifier and antenna systems with earthing switches connected in series, and an operating mode control panel connected to the reference generator output through the shaper of the code sequence, the outputs of the control panel are connected to the second inputs of the frequency divider and power amplifier and, located in underground workings, a receiving set, each containing an antenna connected to the input of a selective amplifier, the output of which is connected to the inputs of two parallel-connected frequency mixers, while the second input of the first mixer is directly connected to the output of the local oscillator, and the second input of the second frequency mixer is connected to the local oscillator through a phase shifter, the outputs of each mixer through low-pass filters each and then through threshold elements are connected to two inputs of a phase detector, the output of which is fed to the input decoder od

commands, the output of the command decoder is connected to the speech converter and then through the low-frequency amplifier to the loudspeaker and supplemented with a portable mine methane detector, containing a methane sensor connected to a methane signaling unit, the output of which is connected to a methane concentration meter, powered from the power supply receiver ( not shown), but through its voltage regulator.

When searching in patent and scientific and technical literature, no technical solutions were found that were similar to the features, distinguished by them, the claimed technical solution from the prototype. Therefore, the claimed technical solution has significant differences.

The drawing shows a functional diagram of the device.

The wireless underground alarm and methane monitoring device contains a transmitting kit (ground-based part) and emergency alert receiving kits combined with portable mine methane signaling devices located in individual mining lamps (underground part).

The transmission set consists of a series-connected reference generator 1, a divider with a variable division coefficient 2, a power amplifier 3, an antenna 4 and ground electrodes 5, as well as a control panel 6, the first output of which is connected to a frequency divider 2, and the second to a power amplifier 3. When this output of the reference generator 1 is connected to the input of the control panel through the shaper code sequence (processor) 7. Moreover, the third output of the control panel 6 is connected to the second input of the shaper 7.

The receiving sets (one set is shown in the drawing) contain (each) an antenna 8 connected to the input of the selective amplifier 9, to the output of which the first inputs of the frequency mixers 10, 11 are connected in parallel, the second inputs of the mixers 10. 11 are connected to the local oscillator 12, moreover, one input is connected directly. and the other through the phase shifter 13. At the same time, the outputs of the mixers 10, 11 through the low-pass filters 14, 15 and then sequentially through the threshold elements 16, 17 are connected to two inputs of the phase detector 18. The output of the phase detector is connected to the input of the command decoder 19, the output of which, in turn, through the speech converter 20, then through the low-frequency amplifier 21 to

loudspeaker 22. Receiving sets (each) are supplemented by a scheme of a portable mine methane signaling device containing a methane sensor 23 and an alarm unit 24 connected to its output with a methane concentration meter 25, fed through a voltage regulator 26 from the power supply common with the receiving device circuit (not shown in the drawing )

The basic principle of the operation of a wireless lifting alarm system and monitoring the presence of methane in underground workings is that on the transmitting side the initial information of an emergency-calling nature is encoded in the corresponding binary sequence of a binary code combination, which then modulates the carrier frequency of the signal emitted by the transmitter from the day surface earth to the shield through grounded antennas.

In the mine, the signal received by the receiving device is demodulated, processed by the decoder, where the necessary code sequence is allocated from it to enable the alarm-ringing alarm.

The methane presence detector operates as follows.

In the presence of methane on the thermocatalytic methane sensor, the signal enters the alarm unit, where it is processed and turns on the alarm, at the same time this signal includes a methane concentration meter that shows the concentration of methane in the mine atmosphere. Reliability and accuracy of the methane signaling circuit is ensured by the voltage regulator circuit.

Consider in more detail the operation of the proposed device. When you press the appropriate buttons on the panel of the control panel 6 (the keyboard of the console 6 is not shown in the drawing) that displays any specific code, the driver 7 generates a code sequence from the signal from the generator 1. At the end of the set, the signal from the driver 7 is fed to the input of the control panel 6 and then to the control input of the divider 2, at the same time, a signal from the reference generator 1 arrives at its other input. In the divider 2, depending on the level of the code sequence coming from the processor-former 7 through control unit 6 is formed chastotnomanipulirovanny signal, wherein the frequency level corresponds O F1,

Level 1 corresponds to frequency F2. Next, the signal is amplified by a power amplifier 3 and antennas 4 through the grounding 5 is radiated into the mountain range.

Electromagnetic signals propagating in the massif are received by each receiving device, in particular, its antenna 8, are converted into electrical signals, amplified by a broadband selective amplifier 9, and then fed to the first inputs of frequency mixers 10, 11, to the second inputs of which signals are sent from the local oscillator 12 directly to the mixer 10 and, through the digital phase shifter 13 to the mixer 11. At the outputs of the mixers 10, 11 appear harmonic oscillations of the difference frequency, and these signals are shifted relative to each other 90 yards

Both received signals pass through low-pass filters 14, 15 and are supplied to threshold elements 16.17. Further, through the phase detector 18, where a digital signal is generated corresponding to the transmitted information, the signal is supplied to the decoder 19, where the corresponding alarm or call signals are generated, which are then sent to the speech pre-converter 20, from it to the amplifier 21 and then are reproduced by the loudspeaker 22.

The methane detector circuit works as follows) ak1m. In the presence of methane in the atmosphere of the mine workings, a signal appears on the methane sensor 23, which then goes to the input of the alarm unit 24. where, after appropriate processing, it turns on an LED signaling an explosive situation. In addition, a methane concentration meter 25 is provided at the output of the alarm unit, which displays a specific value of methane concentration in the atmosphere of the mine workings. To ensure accuracy of the readings, the circuit of the alarm unit is powered from its voltage stabilizer 26, which, in turn, is powered from a power source common to the receiving device .

Thus, combining in one device the functions of emergency warning and control of the volume fraction of methane in the atmosphere of mine workings, allows you to expand the functionality of emergency technological signaling.

Claims (1)

A device for wireless underground alarm and monitoring the volume fraction of methane in the atmosphere of mine workings, containing a transmitting kit installed on the day surface of the mine, consisting of a unit for generating and supplying an emergency call signal, a transmitter and a transmitting antenna connected to it with grounding conductors at its ends and located in underground workings receiving sets, each of which consists of a receiving antenna connected through an amplifier to a signal processing unit, including a selector ny amplifier decoder, speech converter, a low frequency amplifier and a loudspeaker, characterized in that each receiving device supplemented portable mine methane signaling device comprising methane sensor connected to the alarm unit and the methane concentration meter.