SU1335722A1 - Apparatus for automatic remote monitoring of methane content in mining zone - Google Patents

Abstract

The invention relates to the mining industry and makes it possible to increase the reliability and informativeness of the gas control by transmitting teleinformation and components of the methane content of the mine site over the same communication line. The device consists of three methane sensors (DM) 1-3, the outputs of which through the acc. Executive blocks 4-6 are connected to blocks 7-9 of the relay with switching contacts (PCs) 21-23. Amplifier 10 is connected to the DM 1 output, and voltage to frequency converters 11 and 12 are connected to the DM 2, 3 outputs. A display device 13, a communication line J4 and a recording device J5 are connected to the output of amplifier 10. Generators (D) 16-18 television signals are powered through a transistor switch 19, controlled by a multivibrator 20 or. with s /)

Description

mine it, depending on the position of the PC 21-23, Parallel PC 22-23 included resistors 24 and 25. On the second output of the power source G 17 and 18 are powered through the optocouplers 26 and 27, controlled by the converters P and 12. At the receiving end of link 4 in parallel with

The invention relates to the mining industry, namely, to devices for automatically remotely controlling the methane content in the mine workings of gas-hazardous mines.

The aim of the invention is to increase the reliability and informativeness of gas control by transmitting teleinformation on the same communication line about the components of the methane content of the mining site.

The drawing shows a functional diagram of the proposed device.

The device consists of three sensors 1-3 of methane, to the outputs of which .connected sequentially in pairs connected executive units 4-6 and blocks 7-9 of the relay. The methane sensors are also connected: to the output of sensor 1 of methane amplifier 10, and to the outputs of sensors 2 and 3, respectively, voltage converters 11 and 12 to frequency. A display device 13 is connected to the output of the telemetry amplifier 10, the communication lines are a telephone pair of wires 14 and a recording device 15. The television signal generators 16–18 are powered by a transistor switch 19 controlled by a multi driver 20, or by a mine depending on the position switching .contacts 21-23 blocks 7-9 relays. Parallel to the closing contacts of the on / off contacts 22 and 23, resistors 24 and 25 are turned on. On the second output of the power source, the generators 17 and 18 of the television signals are powered via the optocouplers 26 and 27, respectively, controlled by converters P and 12 voltage to frequency. The outputs of the generators 16 and 18 are connected to

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pv 15 connected frequency receivers 28-30 television signals with signal lamps 31-33. When the DM 1-3 are triggered, the states of the PCs 21-23 and G16-18 change periodically on and off, the flashing of the lamps 31-33 signals an emergency situation. 1 il.

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Communications Research Institute 14, at the receiving end of which frequency receivers 28–30 television signals are connected in parallel with the registering device 15, signal lamps 31–33 are connected to the outputs of the latter, and frequency converters 34 and 35 are connected to the second outputs of frequency receivers 29 and 30 and recording devices 36 and 37.

The device works as follows.

The output signal from the sensor 1 of methane is converted by the amplifier 10 into a unified one and is fed through the indicating device 13, the communication line 14 to the recording device 5 installed in the control room of the mine. The signal from the sensor 1 of methane is also fed to the input of the executive unit 4, when the methane content at the installation site of the sensor 1 is less than permissible. The safety regulations for the size of the executive unit 4 do not give the command to turn off the electricity, i.e. the relay unit 7 is turned on, the closing contact 21 of the switch is closed, the generator 16 is connected to a power source. The signal from the generator 16 enters the link 14 and at its other end is detected by the frequency receiver 28, and the light 3 is on, signaling the normal methane content. When the sensor signal -1 of methane exceeds the setting (permissible according to the safety rules of methane content), the executive unit 4 de-energizes the relay unit 7, which disconnects the electrical equipment and the state of the switch contacts 21 changes accordingly. transistor switch J9 controlled by multivibrator 20, i.e. intermittently on and off with a pulse and pause duration of 2-3 seconds. The manipulation of the high-frequency signal of the multivibrator 20 by the transistor switch 19 causes the light bulb 3 to flash, indicating an emergency gas situation. Executive units 5 and 6, blocks 8 and 9 relays with switching contacts 22 and 23, television signaling generators 17 and 18, and television signaling frequency receivers 29 and 30 with signal lamps 32 and 33, which receive the signal from methane sensors 2 and 3, work similarly.

Voltage converters 41 and 12 to frequency, connected to sensors of 2 3 metas, convert the signal from methane sensors to pulses with a duration of several milliseconds, the frequency of which is proportional to the methane content. The pulses from the converters 11 and 12 of the voltage to the frequency control the operation of the optical keys 26 and 27, which interrupt the power supply of the generators 17 and 18

tele-alarm, carried out the manipulation of the communication line and the first recording of signal generators with a frequency proportional to the methane contained at the installation site of the methane sensors.

Due to the short duration of the pulses that carry information about the methane content, the output relays of the remote signaling receivers 29 and 30 do not have time to turn off, i.e. The transmission of methane content information by manipulating high-frequency signals does not disturb the operation of the tele-alarm system. When the methane content in the installation site of sensors 2 and 3 of methane exceeds the setpoint, the executive units 5 and 6 are triggered, the blocks 8 and 9 relays and the opening contacts of the switching contacts 22 and 23 close to eliminate information loss at the moment of the locked transistor switch 19, the closing contacts of the switching pins 22 and 23 are triggered by resistors 24 and 25.

Resistors 24 and 25 are chosen so that the magnitude of the high-frequency signal from the generator, fed by the reduced voltage across them, is insufficient for

holding the output relays of the frequency receivers 29 and 30 of the remote signaling system and the warning lights 32 and 33 work as described above.

After the high-frequency signal is detected by the receivers 29 and 30, low-frequency pulses are made at their second outputs, which are used to manipulate the signals of the generators 17 and 18.

The second outputs of the frequency receivers 29 and 30 are connected respectively. Transducers 34 and 35 of the frequency into current unified signals, which are fed to the recording devices 36 and 37.

Claims (1)

Invention Formula 20 An automatic telecontrol device for methane content in the mining area, containing three methane sensors, the outputs of which are connected to executive units and relay units connected in pairs in series, the output of the first sensor is also connected to an amplifier connected in series showing the instrument, five a device, a multivibrator, three switching contacts of relay units, three television signal generators, the outputs of which are connected to the communication line — a pair of wires, three frequency receivers of television signals, whose inputs are connected to the communication line, and the first outputs are connected to the signal lamps different from what with Q in order to increase the reliability and informativeness of the gas control by transmitting over the same communication line tele-information about the components of the methane content of the mining site, a transistor switch, two voltage-to-frequency converters, two optocouplers,; two frequency to voltage converters and two recording devices, Q wherein the outputs of the second and third methane sensors are connected respectively to the inputs of the first and second voltage to frequency converters, the outputs of which are respectively connected (- with the inputs of optocouplers, which are included in one of the power rails of the second and third television signal generators, the resistors are connected in parallel with the closing contacts of the second and 51335722. The third switching contacts are also connected in parallel by the relay, the second outputs of the second and connected closing contacts of the third frequency receivers of the telescopic groups of all the relay units, their signals are connected to the inputs of the frequency switching contacts - Respectively with the second buses, the power supplies of which are connected to the second initiators of the television signal generators, and with the second recording devices, the contacts of the contact groups of the multivibrator output are connected to the base — all The x relay blocks are also connected to a transistor switch, the emitter of which is IQ in parallel and connected to the collector with a second power supply, to the co-PD of the transistor switch.