CN2934582Y - Coal mine methane detection and automatic fan control device - Google Patents
Coal mine methane detection and automatic fan control device Download PDFInfo
- Publication number
- CN2934582Y CN2934582Y CN 200620092688 CN200620092688U CN2934582Y CN 2934582 Y CN2934582 Y CN 2934582Y CN 200620092688 CN200620092688 CN 200620092688 CN 200620092688 U CN200620092688 U CN 200620092688U CN 2934582 Y CN2934582 Y CN 2934582Y
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Abstract
A fan automatic control device with the function of coal mine gas detection has an air exhausting fan. The input terminal of the fan is connected with a frequency converter, which is connected with the output terminal of a single chip microcomputer through a digital -analog converter, the input terminal of the single chip microcomputer is connected with a gas concentration sensor through an analog-digital converter and a safety barrier, which is connected in sequence, and the other input terminal and output terminal of the single chip microcomputer are also respectively connected with the corresponding key and the digital tube which shows the measured concentration and could set concentration, achieving normal low-power ventilation operation in the absence of gas and saving energy. Along with the increasing of gas concentration, the operation speed of fan is rapidly improved, ventilation speed is increased and the gas concentration is quickly decreased to prevent gas explosion and to ensure the safety of staff.
Description
Technical field: present technique relates to the automatic control system that coal mine gas detected and got rid of with blower fan gas.
Background technology: for a long time, the quantity of gas accident proportion in the sum of coal mining accident is high always.Expert statistics is arranged, and the ratio of gas accident is near 70% in the coal mining accident more than dead 3 people, and gas accident accounts for more than 90% in the coal mining accident more than dead 10 people.In June, 2002, especially big gas explosion accident takes place in colliery, Jixi, Heilungkiang, causes 124 people's death; In January, 2003, the Fengcheng is built new colliery gas explosion accident is taken place, and 48 miners are wrecked; In October, 2004, gas explosion accident takes place in big flat colliery, Henan, and 147 miners are wrecked; In November, 2004, gas explosion accident takes place in colliery, Tongchuan, Shaanxi Province mineral bureau Chen Jia mountain, and 166 miners are wrecked; In February, 2005, especially big mine disaster takes place in Sun Jia gulf, Fuxin, Liaoning, and 214 people are wrecked.Gas is that a kind of harmful gas common under the coal mine has another name called biogas, and formal name used at school methane is a kind of colourless, odorless, tasteless, inflammable, explosive gas.Gas is attached in the coal seam at ordinary times, can diffuse out automatically in the seam mining process.When the concentration of gas in the air 5.5% between 16% the time, has under the situation of naked light and will blast, and concentration is in 9.5%, the power maximum of its explosion time, destructiveness are also the strongest.Can produce high temperature, high pressure, shock wave during gas explosion, and give off poisonous gas.In order to reduce and to avoid the main and the most effective way of gas accident is the concentration that as far as possible reduces fire damp, with enough air quantity gas is watered down, and discharges ground.Mine mainly uses ventilating fan to carry out mine ventilation, this method is that ventilating fan is installed near the air-out well head, ventilating fan is communicated with the air-out pit shaft, the blast that utilizes the ventilating fan generation is with mine air sucking-off ground, and just nature is in air intake well head inflow well for the fresh air on ground simultaneously, and the realization mine is when fire damp concentration reaches 1.5%, underground work personnel withdraw, ventilating fan continues the original operating condition of maintenance, and after the wait gas density reduced, the staff returned underground work.In addition, the general power of ventilating fan that uses is excessive now, and power consumption is serious, if be replaced with the small-power ventilating fan, the gas of discharging high concentration for needs fast is untimely again.
Summary of the invention:
The present invention be exactly solve existing blower fan can not be along with the difference of fire damp concentration the different problem of exhaust air rate; Provide a kind of when not having gas, keep less ventilation running, save the energy, increase along with gas density, the blower fan running speed improves rapidly, ventilation speed is accelerated, realize reducing rapidly gas density, prevent gas explosion, guarantee that the coal mine gas of personnel's life security detects and draught fan automatic control device.
In order to address the above problem, coal mine gas of the present invention detects and draught fan automatic control device, the blower fan that air draft is arranged, it is characterized in that: the input of blower fan is associated with frequency converter, frequency converter connects with the output of single-chip microcomputer by D/A, A/D converter, safety barrier that the input of single-chip microcomputer passes through to connect successively connect with gas concentration sensor, and other input, the output of single-chip microcomputer is also distinguished correspondence and connected with the charactron that button, demonstration measured concentration are set concentration.Single-chip microcomputer also connects with memory and reset circuit.Single-chip microcomputer also is associated with communication interface.This cover gas of the present invention's design detects and draught fan automatic control system, at the mining face under mine sensor installation, before blower fan, install frequency converter additional, can be implemented in when not having gas, keep the normal running of ventilating, save the energy, be equivalent to change small-power blower fan (this duty must keep a lower limit normally to ventilate); Along with the increase of gas density, the blower fan running speed improves rapidly, and ventilation speed is accelerated, and realizes reducing rapidly gas density, prevents gas explosion, guarantees the purpose of personnel's life security.System is made up of four parts such as blower fan of gas concentration sensor, detection control circuit, frequency converter and ventilation.Under the situation that fire damp concentration increases, regulate frequency converter automatically, the rotating speed of control ventilating fan reaches automatic adjusting and increases ventilation, reduces the purpose of gas density rapidly; When not having gas, reduce ventilating fan rotating speed (must guarantee lower limit), keep normal ventilation, reach the purpose of saving electric weight.Realized not only energy-conservation but also safe effect by above control device.
Description of drawings: accompanying drawing has represented that a kind of coal mine gas of the present invention detects and the draught fan automatic control device structural representation, and Fig. 1 detects and the draught fan automatic control device theory diagram for gas, and Fig. 2 detects and the draught fan automatic control device basic circuit diagram for gas.Example below in conjunction with accompanying drawing further specifies.
Specific embodiment: this coal mine gas of the present invention detects and draught fan automatic control device (seeing accompanying drawing), the blower fan that coal mine and tunnel air draft are arranged, the input of blower fan is associated with frequency converter, frequency converter connects with the output of single-chip microcomputer by D/A, A/D converter, safety barrier that the input of single-chip microcomputer passes through to connect successively connect with gas concentration sensor, and other input, the output of single-chip microcomputer is also distinguished correspondence and connected with the charactron that button, demonstration measured concentration are set concentration.Single-chip microcomputer also connects with memory and reset circuit; Single-chip microcomputer also is associated with communication interface.Gas concentration sensor is installed in the operation field of down-hole, the gas density at scene is converted to the 4-20mA current signal of standard, after isolation safe grid and I/V conversion, give ILC7135 chip, convert analog quantity to digital quantity for the single-chip microcomputer calculation process, and with set concentration and compare, the output of decision control circuit, the control of single-chip microcomputer output signal is by the rotating speed of Frequency Converter Control ventilating fan.
Circuit adopts the single-chip microcomputer and the peripheral circuit of American ATMEL, comprising:
1, AT89C52 single-chip microcomputer
AT89C52 is a low-voltage, 8 single-chip microcomputers of high-performance CMOS, sheet include 8k bytes can be erasable repeatedly the Flash read-only program memory and the Random Access Data memory (RAM) of 256 bytes, device adopts high density, the nonvolatile storage technologies production of atmel corp, compatibility standard MCS-51 instruction system, 8 central processing units of sheet built-in general-purpose and Flash memory cell, powerful AT89C52 single-chip microcomputer can be you and provide many than the control of complex systems application scenario.
AT89C52 has 40 pins, and 32 two-way I/O in outside (I/O) port includes 2 outer middle fractures simultaneously, 3 16 programmable Timer counters, 2 full duplex serial communication ports, 2 access hole lines, AT89C52 can programme according to conventional method, also can online programming.It is in the same place general microprocessor and Flash memory combination, and particularly Flash memory that can be erasable repeatedly can reduce development cost effectively.
2, mould/number (A/D) converter ILC7135.
ICL7135 is 4 semi-simple A/D converters of double oblique integral formula, 28 pin DIP encapsulation.ICL7135 precision height, good in anti-interference performance, price are low, use very extensive.The Main Feature of ICL7135 is:
1) input impedance is big, to almost not influence of circuit-under-test;
2) automatic zero adjustment;
3) accurate difference input circuit is arranged;
4) automatic judgment signal polarity;
5) super, under-voltage output signal is arranged
In order to save single-chip processor i/o mouth and peripheral components, we utilize " busy " end of ICL7135, and a timer that needs only an I/O and 89C52 inside just can be sent into single-chip microcomputer to the data of ICL7135.
ICL7135 is the analog signals that gas concentration sensor transmits to be converted to data signal give the single-chip microcomputer computing in the effect of native system, and compares with setting concentration, control output.
3, control output circuit
According to the operation result of single-chip microcomputer, the D/A switch circuit converts digital quantity to the 4-20mA analog quantity, the output of control frequency converter, and then the running speed of control blower fan.
4, charactron shows and key circuit
Double 8 charactrons, last 4 show measured concentration, following 4 display setting concentration, gas is set concentration and is set by button.
5, AT24C02 serial (E2PROM) E
2Prom memory
AT24C02 is Low-Power CMOS serial (E2PROM) E of American ATMEL
2PROM includes (256x8) 256 * 8 memory spaces, have operating voltage wide (2.5～5.5v), the fast characteristics such as (less than 10ms) of erasable (greater than 10000 times) often, writing speed.
The AT24C02 memory is used to store the gas alarming concentration value of setting in native system, also can not lose setting value even guarantee entire circuit under the situation of power down.Each applying unit can be set with button as the case may be.
6, self-resetting circuit
System adopts " house dog " self-resetting circuit and various software measure, the continuous reliability service of assurance system and not crashing.
7, standard communication interface
Standard communication interface can link to each other with equipment such as telephone wire, mobile GPRS, with Dispatch and Command Center and the networking of each functional department, thereby grasps gas density situation under the mine at any time, guarantees the Safety of Coal Mine Production operation.
8, safety barrier
Safety barrier is applied in the design of intrinsic safe explosion-proof system, it is to be installed on harbor and to contain intrinsically safe circuit and the device of non-intrinsically safe circuit, limited the energy that is sent to on-the-spot intrinsic safety loop by current limliting and pressure limiting circuit in the circuit, thereby the dangerous energy that prevents non-intrinsically safe circuit seals in intrinsically safe circuit, and it is the important component part of intrinsic safety system.
Because safety barrier is designed to the interface of between site plant and control room equipment one restriction energy, therefore no matter control room equipment is in normally or malfunction, and the energy that safety barrier can both guarantee to send to by it site plant is an essential safety.Native system is workable, and it is simple and easy to do to operate; Safety can guarantee.
Claims (3)
1, a kind of coal mine gas detects and draught fan automatic control device, the blower fan that coal mine and tunnel air draft are arranged, it is characterized in that: the input of blower fan is associated with frequency converter, frequency converter connects with the output of single-chip microcomputer by D/A, A/D converter, safety barrier that the input of single-chip microcomputer passes through to connect successively connect with gas concentration sensor, and other input, the output of single-chip microcomputer is also distinguished correspondence and connected with the charactron that button, demonstration measured concentration are set concentration.
2, detect and draught fan automatic control device as the said coal mine gas of claim 1, it is characterized in that: single-chip microcomputer also connects with memory and reset circuit.
3, detect and draught fan automatic control device as the said coal mine gas of claim 1, it is characterized in that: single-chip microcomputer also is associated with communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620092688 CN2934582Y (en) | 2006-08-03 | 2006-08-03 | Coal mine methane detection and automatic fan control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620092688 CN2934582Y (en) | 2006-08-03 | 2006-08-03 | Coal mine methane detection and automatic fan control device |
Publications (1)
| Publication Number | Publication Date |
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| CN2934582Y true CN2934582Y (en) | 2007-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200620092688 Expired - Fee Related CN2934582Y (en) | 2006-08-03 | 2006-08-03 | Coal mine methane detection and automatic fan control device |
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| CN (1) | CN2934582Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957358A (en) * | 2010-09-10 | 2011-01-26 | 中国矿业大学 | Combustible igniting mixed gas automatic distributing and igniting test device |
| CN102444606A (en) * | 2011-11-10 | 2012-05-09 | 大同煤矿集团有限责任公司 | Fan frequency conversion control system and method for air pressure dynamic balance of mine stope |
| CN101713297B (en) * | 2009-09-04 | 2012-05-30 | 中国矿业大学(北京) | Method and equipment for suppressing gas from multiple continuous explosions |
| CN101713581B (en) * | 2009-11-25 | 2012-07-25 | 山东大学 | Stored PH3 gas concentration monitoring device |
| CN109958474A (en) * | 2019-03-18 | 2019-07-02 | 天地（常州）自动化股份有限公司 | Driving face in coal mine local ventilation intelligent control method and ventilated control system |
-
2006
- 2006-08-03 CN CN 200620092688 patent/CN2934582Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713297B (en) * | 2009-09-04 | 2012-05-30 | 中国矿业大学(北京) | Method and equipment for suppressing gas from multiple continuous explosions |
| CN101713581B (en) * | 2009-11-25 | 2012-07-25 | 山东大学 | Stored PH3 gas concentration monitoring device |
| CN101957358A (en) * | 2010-09-10 | 2011-01-26 | 中国矿业大学 | Combustible igniting mixed gas automatic distributing and igniting test device |
| CN101957358B (en) * | 2010-09-10 | 2013-07-03 | 中国矿业大学 | Combustible igniting mixed gas automatic distributing and igniting test device |
| CN102444606A (en) * | 2011-11-10 | 2012-05-09 | 大同煤矿集团有限责任公司 | Fan frequency conversion control system and method for air pressure dynamic balance of mine stope |
| CN109958474A (en) * | 2019-03-18 | 2019-07-02 | 天地（常州）自动化股份有限公司 | Driving face in coal mine local ventilation intelligent control method and ventilated control system |
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