RU2539052C1 - Automated system for air-and-gas control and prevention of explosion in working face - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: automated system for air-and-gas control and prevention of explosion in a working face with a sprinkling device of a mine working and with a winning machine includes stationary temperature sensors installed on each section of the support and at least one complex measuring device installed on the winning machine and provided with a methane sensor, a temperature sensor and a carbon oxide sensor, which are compactly arranged in a single housing. A sequence of each monitoring and control unit includes logic of comparison of measurements of the temperature sensor installed on the winning machine to measurements of stationary temperature sensors for output of a warning signal at fixation of insufficient coincidence of the above measurements. Besides, monitoring and control units are provided with radio modules for wireless communication to the complex measuring device and the stationary temperature sensors. The complex measuring device can include a carbon oxide sensor, and the monitoring and control units have a possibility of activation of operation of the sprinkling device. On the winning machine there can be arranged two complex measuring devices on maximum remote ends of its housing.

EFFECT: minimising explosion hazard by reliable detection of manipulation with gas sensors and prevention of coal self-ignition in a working face.

4 cl, 1 dwg

Description

The invention relates to the mining industry, and in particular to an automated system of aerogas control in the face and is intended to create safe working conditions in the mine.

Known automated gas control system and prevent explosion in the face according to patent RU 2374444, published on 11.27.09. This system contains a calculation device, with which, depending on the speed of the mining machine and the depth of cut, the volume of coal production is calculated. The comparison unit determines the correlation between the methane concentration measured along the face and the volume of coal production, and on the basis of insufficient correlation, it reveals the fact of manipulation with methane sensors. Methane sensors installed along the bottom are connected to the control system of wire communication lines.

The disadvantage of such a gas control system is its unreliability due to the dependence of gas control on the accuracy of measuring many technological parameters of a mining machine.

Another disadvantage is the unreliability fraught with damage to the wired communication line of methane sensors with the control system.

The next drawback of the system is the lack of control and prevention of spontaneous combustion of coal.

Known integrated measuring device according to patent CN 202330396 (publ. 11.07.2012) for air and gas control in the mine. This device, provided with autonomous power supply, includes temperature sensors, methane, carbon monoxide, hydrogen sulfide and other gases, placed in a single housing and having the ability to send measurement signals over a wireless communication line.

A measuring device for air and gas control in a mine is also known from patent CN 202370585 (publ. 08.08.2012).

The disadvantage of the above measuring devices is that they are not protected from intentional manipulation by personnel.

The automated gas monitoring and control system at hazardous sites known from patent RU 2455695 (publ. 10.07.2012) also does not provide protection against deliberate interference with the operation of sensor sensors.

Closest to the claimed invention is an automated system for aero-gas control and prevention of an explosion in the face (patent RU 2459958, publ. 08.27.2012) with an irrigation device and a mining machine that has the ability to move along a number of sections of mechanized roof supports controlled by control and control units. This system contains temperature sensors, methane sensors and carbon monoxide sensors, stationary located at the beginning and end of the face and connected to the blocks of the control system lining wire lines. At least one methane sensor is installed on the mining machine.

The disadvantage of this system is that the methane sensors are not protected from intentional manipulation, such as, for example, sticking or directing to the gas sensor a continuous stream of supply air produced by maintenance personnel to increase production.

Another disadvantage is the unreliability fraught with damage to the wired communication line of methane sensors with the support system control units.

The next drawback of the system is the lack of control and prevention of spontaneous combustion of coal.

The technical problem to which the invention is directed is minimizing the danger of an explosion in a mine due to the reliable detection of manipulation with gas sensors and the prevention of spontaneous combustion of coal in the mine.

The problem is solved in that the automated air-gas control system with a production irrigation device and a mining machine, which has the ability to move along a series of powered support sections controlled by control and control units, as well as the prototype, contains stationary temperature sensors located in the bottom, and at least one a methane sensor mounted on a mining machine.

In contrast to the prototype, at least one temperature sensor is installed on the production machine, compactly located in the integrated measuring device housing, integrated with the methane sensor, stationary temperature sensors are installed on each lining section, and the logic for comparing measurements installed on a mining machine, a temperature sensor with measurements of stationary temperature sensors to issue a warning signal when fixing insufficient measurement coincidence a temperature sensor installed on a mining machine with measurements taken at the same time of the nearest stationary temperature sensor.

The technical problem is also facilitated by the fact that the monitoring and control units are equipped with radio modules for wireless communication with the integrated measurement device and stationary temperature sensors equipped with the radio modules.

In addition, the integrated measuring device comprises a carbon monoxide sensor, and the monitoring and control units have the ability to activate the irrigation device in case of exceeding the allowable temperature and carbon monoxide concentrations recorded by at least one integrated measuring device.

In addition, preferably two integrated measuring devices are installed on the mining machine located at the most distant opposite ends of the mining machine body.

The invention is illustrated by a simplified scheme of the face with many installed in a row of sections 1 mechanized lining, which in the usual way connected with the lava conveyor 2. The mining machine 3 has the ability to move along the coal seam 4 (arrows A in the diagram), the beaten coal is transported along the conveyor 2.

The control and control units 5 are located from each other, preferably at a distance of several sections 1 and have the ability to control the mechanisms of several, for example three, sections associated with them 1.

Stationary temperature sensors 6 are installed on each section 1 of the lining, preferably on its top, and are equipped with radio modules 7 based on the microcontroller for communication with the control and control unit 5 of the nearest section 1 via radio module 8 based on the microcontroller. Stationary temperature sensors 6 have the ability to work in the mode of "activity" and "sleep" with respectively approaching and moving away from them mining machine 3.

At least one, and preferably two, integrated measuring devices 9, with autonomous power supply, are installed on the front and rear, most remote opposite ends of the mining machine body 3. Each complex measuring device 9 contains a methane sensor 10, a carbon monoxide sensor, compactly placed in a single case 11 and a temperature sensor 12. The said sensors are arranged in such a way that the personnel intentionally isolating the methane sensor 10 from the external environment leads to a distortion of the measurements in the immediate vicinity of the temperature sensor 12. It is possible to include in the complex measuring device 9 sensors of other gases, for example carbon dioxide, hydrogen sulfide, ozone, etc. The complex measuring device 9 is equipped with a radio module 13 made on the basis of the microcontroller for wireless transceiver communication (arrows B on the diagram) with the control and control unit 5 of the nearest section 1 through the radio module 8. Moreover, the radius of action of all the radio modules of the system is limited.

Each control and control unit 5 is made on the basis of a microcontroller 14, the program memory of which contains the logic of comparing the measurements of the temperature sensor 12 installed on the mining machine 3 with the measurements of the stationary temperature sensors 6 to generate an alarm signal when there is insufficient measurement matching of the temperature sensor installed on the mining machine 3 12 with measurements taken at the same time of the nearest stationary temperature sensor 6.

The signal of each sensor of the air-gas control system contains a code that uniquely identifies it in this system. The program memory of the microcontroller 14 contains the individual code of section 1 and the ranges of the values measured by the sensors necessary for safe and trouble-free operation.

Each monitoring and control unit 5 is equipped with an optical indicator device for reflecting information on gas concentrations near this section 1 and an alarm and warning device 15, including optical and audible alarms.

The irrigation device contains lining mounted on sections 1 and electrically actuated valves 16 connected to the water supply line, with the ability to supply irrigation water through nozzles 17. The microcontroller 14 has the ability to turn on and off electrically actuated valves 16 of several sections associated with it 1. Irrigation water supply in a standard mode is shown in the diagram by arrows B.

The control and control units of 5 sections are interconnected with the central control panel 18 of the communication line 19. The central control panel 18, connected with the control panel 20 on the surface of the mine, has the ability to turn off the power of the downhole mechanisms 21 to prevent an explosion.

Supply ventilation units (not shown in the diagram) located at the beginning and / or end of the face are outside the radius of the radio modules 8. As a result, the deliberate transfer of the complex measuring device 9 to the supply air source leads to the inclusion of an alarm and warning device 15 in connection with the output of the radio module 13 from the "zone of visibility" of the radio modules 8 (similarly in the event of a malfunction).

Stationary methane sensors are installed at the characteristic points of the face, regulated by the requirements of the Safety Rules.

The work of the automated system of air-gas control and prevention of explosion in the face is as follows.

The mining machine 3 develops a coal seam 4, moving sequentially along a number of sections 1. Due to the fact that the signal of the microcontroller 14 contains an individual code, the control system uniquely determines the location of the mining machine 3.

Each of the complex measuring devices 9 sends via transceiver communication line (arrow B in the diagram) to the nearest monitoring and control unit 5 the measurement data of its sensors. In turn, the control unit 5 polls the temperature sensors 6 of the corresponding sections 1, while the temperature sensors 6 of the remaining, not polled sections, work in sleep mode. The control and control unit 5 compares the measurements of the temperature sensor 12 installed on the mining machine 3 with the measurements taken at the same time of the nearest stationary temperature sensor 6. If there is no manipulation of the methane sensor 10 by the personnel, the measurements of the temperature sensor 12 coincide with the measurements of the nearest stationary temperature sensor 6 (within the permissible measurement error). When fixing insufficient coincidence of measurements of the mentioned temperature sensors, the control and control unit 5 issues audible and light warning signals through the alarm and warning device 15.

Sound and light alarms are turned on both when the measured concentration of other gases approaches their predetermined maximum concentration, and when the complex measuring device 9 leaves the “visibility zone” of the radio modules 8.

If it is revealed that the permissible values of both the concentration of carbon monoxide and the temperature in the measurements of at least one complex measuring device 9 are exceeded, which is fraught with the occurrence of an endogenous fire from self-heating of coal, a larger number (in comparison with the standard mode) of control and control units 5 include actuated valves 16, thereby activating the operation of the irrigation device.

The measurement data of all sensors from the control and control unit 5 of one section are transmitted via a serial communication line to 19 control and control units 5 of all other sections 1, as well as to the central control unit 18 and the control room control unit 20, where they are visualized on the displays of their computers and recorded in the database data. As a result of a survey of stationary temperature sensors 6, the displays show a gradual change in temperature from section to section, corresponding to the normal physical process of heat distribution.

The compact placement of the methane sensor 10 and the temperature sensor 12 in the housing of the complex measuring device 9 ensures that when manipulating the methane sensor 10, the measurements are distorted in the immediate vicinity of the temperature sensor 12, and it cannot detect the actual temperature of the air present in the face in fact. Stationary temperature sensors 6, evenly distributed along the bottom, measure the actual air temperature near this section 1 and thus serve as a reference for comparison. Due to the fact that the logic of comparing the measurements of the temperature sensor 12 installed on the mining machine 3 with the measurements of the stationary temperature sensors 6 has been introduced into the program of each control and control unit 5, it is possible to issue an alarm signal when there is insufficient measurement matching the measurements of the temperature sensor 3 installed on the mining machine 3 made at the same time measurements of the nearest stationary temperature sensor 6. The above measures allow you to simply and reliably detect the fact of manipulation lyatsii with methane sensor, and hence warn of danger.

Wireless transceiver communication of the monitoring and control units 5 with an integrated measuring device 9 and stationary temperature sensors 6 increases the reliability of their communication and simplifies maintenance.

Equipping an integrated measuring device 9 with a carbon monoxide sensor 11 not only allows you to control the concentration of this gas throughout the face and notify about its increased concentration, but also prevent spontaneous combustion of coal while exceeding both the concentration of carbon monoxide and the temperature recorded by at least one complex measuring device 9.

The preferred placement of two complex measuring devices 9 at the most distant opposite ends of the body of the mining machine 3 not only expands the controlled space, but also allows the automated system to compare the measurements of the methane sensors contained in them to more reliably detect the fact of manipulation with the methane sensor 10.

The above measures minimize the risk of explosion in the mine, which ultimately increase the safety of working conditions.

Claims (4)

1. An automated system for aero-gas control and prevention of explosion in the face with an irrigation device and a mining machine that can move along a series of mechanized roof support sections controlled by control and control units, containing stationary temperature sensors located in the face, and at least one mounted on the bottom to a mining machine, a methane sensor, characterized in that at least one temperature sensor is installed on the mining machine, compactly located in a housing integrated with the methane sensor e of a complex measuring device, stationary temperature sensors are installed on each section of the lining, and the logic of comparing the measurements of the temperature sensor installed on the mining machine with the measurements of the stationary temperature sensors is introduced into the program of each control and control unit to generate an alarm signal when fixing insufficient measurement coincidence of the measurements installed on the mining machine temperature sensor with measurements taken at the same time of the nearest stationary temperature sensor s. 2. The automated system according to claim 1, characterized in that the monitoring and control units are equipped with radio modules for wireless communication with the integrated radio modules equipped with a comprehensive measuring device and stationary temperature sensors. 3. The automated system according to claim 1, characterized in that the integrated measuring device comprises a carbon monoxide sensor, and the monitoring and control units have the ability to activate the irrigation device in case of detection of simultaneous exceeding of permissible temperature and carbon monoxide concentrations recorded by at least one integrated measuring device. 4. The automated system according to claim 1, characterized in that preferably two integrated measuring devices are installed on the mining machine located at the most remote opposite ends of the mining machine body.

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