CN103198604A - Device and method capable of prompting reliability of mining gas pipeline fire detector - Google Patents
Device and method capable of prompting reliability of mining gas pipeline fire detector Download PDFInfo
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- CN103198604A CN103198604A CN2013101088960A CN201310108896A CN103198604A CN 103198604 A CN103198604 A CN 103198604A CN 2013101088960 A CN2013101088960 A CN 2013101088960A CN 201310108896 A CN201310108896 A CN 201310108896A CN 103198604 A CN103198604 A CN 103198604A
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Abstract
The invention relates to detection of gas deflagration instant ultraviolet radiation and infrared radiation and fire alarm signal output, in particular to a device and a method capable of prompting reliability of a mining gas pipeline fire detector. The device capable of prompting the reliability of the mining gas pipeline fire detector is characterized by comprising a detector shell body. A singlechip, an ultraviolet sensitive element, an infrared sensitive element and a quartz window are designed in the interior of the detector shell body. An infrared receiving pipe and an infrared emitting pipe are respectively arranged on the inner side and the outer side of the quartz window. The ultraviolet sensitive element, the infrared sensitive element, the infrared receiving pipe and the infrared emitting pipe are respectively in electric connection with the singlechip. The infrared emitting pipe is controlled to emit infrared lights inside the quartz window by the singlechip. The infrared lights which are emitted by the infrared emitting pipe and received by the infrared receiving pipe are detected by the singlechip to confirm translucency of the quartz window. If pollution is larger than an alarm threshold value, pollution alerting signals are given immediately. Alarm threshold values of the ultraviolet sensitive element and the infrared sensitive element are set by the singlechip. Fire alarm signals are given out through detection of signal amplitudes of ultraviolet of 0.2 Mum and infrared of 2.7 Mum, wherein the ultraviolet of 0.2 Mum and the infrared of 2.7 Mum are produced by external gas combustion. The device capable of prompting the reliability of the mining gas pipeline fire detector is used for quickly detecting the a fire which possibly appears in the coal mine environment or the deflagration phenomenon which appears in a gas pipeline and preventing damage to coal mines and personal safety, wherein the damage is caused by the fire or the gas deflagration.
Description
Technical field
The present invention relates to detection and the fire alarm output of gas detonation moment ultraviolet, infrared radiation, a kind of device and method that promotes gas in mine pipeline fire detector reliability particularly, be used for the deflagration phenomenon that occurs in fire that the quick detection coal mine environment may occur or the gas pipeline, prevent that fire or gas detonation from damaging colliery and personal safety.
Background technology
The particularly serious gas explosion accident of China frequently takes place in recent years, this has all been represented great concern both at home and abroad, prevents that the generation of gas accident from having become the top priority that guarantees Safety of Coal Mine Production.Simultaneously, coal-bed gas (coal-seam gas) is as a kind of high-quality, high heat, clean, " green " energy easily, and the importance of its exploitation is just beginning to be familiar with by people.
Coal and gas safety are adopted theory altogether and have been suggested and have obtained bigger development with technology in recent years, in the process that coal and gas safety are adopted altogether, certainly will cause gas in the middle of extraction equipment or extraction tunnel, to gather, how to adopt an effective measure prevents that gas from blasting in the extraction process, be that coal and gas safety are adopted an important topic theoretical and technical research altogether.
To studies show that of the gas explosion mechanism of transmission and harm, gas temperature, flame velocity etc. behind gas explosion positive pressure of shock wave, shock velocity, the ripple, in a quite long segment distance, all has huge destruction, realize that gas is datonation-inhibition in early days, can increase datonation-inhibition probability, dwindle the blast coverage, reduce the loss that causes because of blast.
Mainly there are following 3 technical barriers in the early stage datonation-inhibition technology of gas at present: 1, in time detect the research and development of gas explosion sensitive period and highly-sensitive detector; 2, the research and development that have the super-fine material of the datonation-inhibition function of explosion arrestment; 3, in blast sensitive period instantaneous injection explosion-suppressing material technology and the research and development of high reliability equipment.The mine subsurface environment is artificial light simultaneously, bias light is single, be easy to unusual optical radiation signal that this blast of identification invar produces, therefore at optical signature in sensitive period particularly in gas explosion early stage, development response fast, the optical detector of accurately surveying have absolute important meaning.
The down-hole flame proof mode that China's tradition is used is passive type flame proof modes such as flame proof rock dust barrier and flame proof fluid barrier, and practical studies proves that when gas and dust explosion intensity was very weak, the measure of passive type flame proof was lost efficacy, and namely can not stop the continuation of explosive flame to be propagated; Simultaneously because reasons such as in the on-the-spot use, the evaporation of ventilating, coal dust pollute, moist cakings, be difficult to play the flame proof effect of expection.
Summary of the invention
The purpose of this invention is to provide a kind of device and method that promotes gas in mine pipeline fire detector reliability, so that the specific environment at the coal-mine gas pipeline, work, also can quick and precisely survey the detector of flame spectrum radiation reliably and with long-term, satisfy the structural design of coal mine environment installation and job requirement.
The object of the present invention is achieved like this, a kind of device that promotes gas in mine pipeline fire detector reliability, it is characterized in that: comprise detector housing, the detector housing indoor design has single-chip microcomputer, ultraviolet sensitivity unit, infrared-sensitive unit, quartz window, the outside has infrared receiving tube and infrared transmitting tube respectively in quartz window, ultraviolet sensitivity unit, infrared-sensitive unit, infrared receiving tube and infrared transmitting tube are electrically connected with single-chip microcomputer respectively, single-chip microcomputer is launched infrared light by the control infrared transmitting tube in quartz window, the infrared light that the infrared transmitting tube that single-chip microcomputer receives by the detection infrared receiving tube sends, to determine the light transmission of quartz window, if pollute greater than alarm threshold value, then provide the pollution cue immediately, single-chip microcomputer is set the alarm threshold value of ultraviolet sensitivity unit and infrared-sensitive unit, by detecting ultraviolet 0.2 μ m that the burning of outside methane gas produces and the signal amplitude of infrared 2.7 μ m, provide fire alarm.
Described detector housing is the right cylinder of Φ 90 * 120mm, the bottom is the circular flange dish of Φ 220mm, the circular flange dish is connected with the mounting hole of 8 Φ 18mm, the detector top is fused quartz window optical window, quartz window, the flange in the bottom dish all adopts packing washer to carry out encapsulation process with the detector place of combination, the detector indoor design has printed circuit board, ultraviolet sensitivity unit is installed on the circuit board, infrared-sensitive unit, fire alarm, status indicator lamp and infrared transmitting tube, wherein infrared transmitting tube is installed in the quartz window outside, by lead signal is introduced printed circuit board, infrared receiving tube is installed on the detector internal circuit board, and two pipes form 180 ° of correlation relations; By regularly detecting the electric signal of infrared transmitting tube, infrared receiving tube, realize quartz window (803) pollution detection.
Described quartz window is the slope.
Described ultraviolet sensitivity unit and infrared-sensitive unit are divided into ultraviolet light fulgurite and PbS infrared-sensitive unit.
1 miniature incandescent lamp of described infrared-sensitive unit's place's installation is used for the timing alignment of infrared-sensitive unit, on the optical path of infrared-sensitive unit and incandescent lamp, with the shell perforate of infrared-sensitive unit, guarantee to shine infrared-sensitive unit when incandescent lamp is lighted, single-chip microcomputer is the driving signal of the bright incandescent lamp of output point regularly, after lighting incandescent lamp, gather the signal amplitude of infrared-sensitive unit again, this signal amplitude is stored in the single-chip microcomputer, background environment as this period, when the signal amplitude that collects infrared-sensitive unit in this period surpasses the background environment value, namely regard as infrared fire alarm.
It is the infrared transmitting tube of 0.89 μ m that described infrared receiving tube and infrared transmitting tube adopt a pair of radiation peak, every 60s once drives infrared transmitting tube by single-chip microcomputer, make power valve export the infrared ray of 0.89 μ m, output time continues about about 100ms, detect the amplitude output signal of infrared receiving tube then, infrared receiving tube adopts electric resistance partial pressure, when receiving infrared radiation, by the opto-electronic conversion output voltage signal, amplify shaping through level sampling later, the output analog voltage signal, simulating signal is directly sent into the AD port of single-chip microcomputer, through after the AD conversion, after comparing with the alarm threshold value of setting.
Described single-chip microcomputer is the embedded-type ARM single-chip microcomputer.
A kind of method that promotes gas in mine pipeline fire detector reliability, its method is:
1) enters the starting stage;
2) remove the quartz window surface;
3) single-chip microcomputer receives the infrared light that sends in the quartz window by infrared receiving tube;
4) detect the infrared receiving tube light intensity;
5) the infrared receiving tube light intensity signal that detects is stored as standard value;
6) enter detection-phase;
7) single-chip microcomputer receives the infrared light that sends in the quartz window by infrared receiving tube;
8) detect the infrared receiving tube light intensity;
9) the infrared receiving tube light intensity signal of detection and the standard value of starting stage are compared;
10) whether greater than; Being to change step 11), is not to change step 12);
11) quartz window surface information is removed in output, reenters step 6);
12) single-chip microcomputer is by driving the work of standard source light, and whether the receiving light power signal that detects ultraviolet sensitivity unit 4 or infrared-sensitive unit is normal, is not, changes step 13), is, changes step 14);
13) output ultraviolet sensitivity unit or infrared-sensitive unit circuit abnormality information reenters step 6);
14) timesharing detects the receiving light power signal of ultraviolet sensitivity unit or infrared-sensitive unit;
15) whether ultraviolet sensitivity unit or infrared-sensitive unit receiving light power signal arrives alarming value, is to change step 16), be not to change step 17);
16) output gas pipeline fire alarm information reenters step 6);
17) reenter step 6).
Advantage of the present invention is: 1, adopt ultraviolet, infrared-sensitive unit that Fire Radiation spectrum is surveyed respectively, by software algorithm with the two paths of signals phase " with " after, output fire alarm; 2, by structural design, with a pair of infrared transmitting tube, receiving tube be installed in detector window inside and outside, by judging infrared transmitting tube, receiving tube characteristics of signals, judge the pollution level of detector window, cue is polluted in output; 3, design CAN bus interface reports detector fire alarm and status information according to communications protocol; 4, carry out structural design according to the colliery standard-required, choose the optical window that guarantees detector by optical material, the metal material of selecting to be fit to the use of mine pipeline carries out reasonable structural design, namely guarantee the sealing grade of detector, satisfy detector anti-vibration, shock resistance and corrosion resistant requirement again.
Description of drawings
Below in conjunction with the embodiment accompanying drawing the present invention is described in further detail:
Fig. 1 is gas in mine pipeline fire detector outside drawing;
Fig. 2 is gas in mine pipeline fire detector theory diagram.
Among the figure: 1, fire alarm, status indicator lamp; 2, infrared transmitting tube; 3, status indicator lamp; 4, ultraviolet sensitivity unit; 5, infrared receiving tube; 6, infrared-sensitive unit; 7, mounting flange; 8, detector housing; 9, single-chip microcomputer; 801, bottom; 802, mounting hole; 803, quartz window; 804, detector.
Embodiment
Describe each related detailed problem in the technical solution of the present invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, detector housing 8 is the right cylinder of Φ 90 * 120mm, and bottom 801 is the circular flange dish of Φ 220mm, and the mounting hole 802 by 8 Φ 18mm is installed on the attached seat of installation of gas tube.Detector housing 8 material selection stainless steels 316, its intensity and corrosion resistance satisfy mining standard.The detector top is fused quartz window 803 optical windows, and its fusing point height, hardness is good, chemical stability is good, heat-resisting and advantage such as shock resistance.803 pairs of ultraviolets of quartz window, infrared transmissivity preferably arranged all.Quartz window 803, the blue dish 801 in bottom all adopt packing washer to carry out encapsulation process with detector 804 junctions, have guaranteed the sealing class requirement of detector IP65.Detector 804 indoor designs have printed circuit board, ultraviolet sensitivity unit 4, infrared-sensitive unit 6, fire alarm, status indicator lamp 1 and infrared transmitting tube 2 are installed on the circuit board, wherein infrared transmitting tube 2 is installed in quartz window 803 outsides, by lead signal is introduced printed circuit board, infrared receiving tube 5 is installed on detector 804 internal circuit boards, two pipes form 180 ° of correlation relations, by regularly detecting the electric signal of infrared transmitting tube 2, infrared receiving tube 5, realize quartz window 803 pollution detections.Quartz window 803 part-structures are designed to 30 ° of slopes, by accurate Calculation, select the installation site of infrared-sensitive unit 6, ultraviolet sensitivity unit 4, have guaranteed the requirement of ° optics visual field, whole detector ± 50.Internal circuit board is installed on the housing by 4 screws, and the intensity of whole detector anti-vibration, anti-physical shock all satisfies the mining equipment requirement.
Fig. 2 is gas in mine pipeline fire detector housing block diagram, detector housing comprises: single-chip microcomputer 9, ultraviolet sensitivity unit 4, infrared-sensitive unit 6, quartz window 803, the outside has infrared receiving tube 5 and infrared transmitting tube 2 respectively in quartz window 803, ultraviolet sensitivity unit 4, infrared-sensitive unit 6, infrared receiving tube 5 and infrared transmitting tube 2 are electrically connected with single-chip microcomputer 9 respectively, single-chip microcomputer 9 is launched infrared light by control infrared transmitting tube 2 in quartz window 803, the infrared light that the infrared transmitting tube 2 that single-chip microcomputer 9 receives by detection infrared receiving tube 5 sends, to determine the light transmission of quartz window 803, pollute if occur, influence detector to the detectivity of insight radiation, then provide the pollution cue immediately, thereby guarantee the detectivity of 6 pairs of Fire Radiations of ultraviolet sensitivity unit 4 and infrared-sensitive unit; The alarm threshold value of single-chip microcomputer inner setting ultraviolet sensitivity unit 4 and infrared-sensitive unit 6, by detecting ultraviolet 0.2 μ m that the burning of outside methane gas produces and the signal amplitude of infrared 2.7 μ m, provide fire alarm according to software algorithm, realize detection quick and precisely and identification to Fire Radiation.
We know that the combustion characteristics of methane gas meets the hydrocarbon compound combustion pattern, there are two radiation peaks in it at ultraviolet 0.2 μ m and infrared 2.7 μ m, by selecting suitable ultraviolet sensitivity unit 4 and infrared-sensitive unit 6 for use, can realize the signal extraction to these two wave bands, ultraviolet sensitivity unit 4 and infrared-sensitive unit 6 are through opto-electronic conversion, the output electric signal is given single-chip microcomputer 9, single-chip microcomputer 9 passes through software algorithm, judge whether to be real fiery signal, thereby realize detection quick and precisely and identification to the gas detonation.
Ultraviolet sensitivity unit is high-pressure work, driving power comprises, the DC12V direct supply, inverter, inverter is converted to DC600V with detector DC12V direct supply, the high-voltage power supply of output 1mA, for ultraviolet sensitivity unit provides the high-pressure work power supply, the discharge pulse of ultraviolet sensitivity unit is continuous spike, voltage amplitude is uneven, realizing shaping work to discharge pulse by the inverter circuit of design band application schmitt trigger, is continuous square wave through the discharge pulse after the shaping, sends into the single-chip processor i/o mouth after isolating, namely realized the collection of ultraviolet light photo signal, conversion has reached isolation effect again.
The timing alignment that 1 miniature incandescent lamp is used for infrared-sensitive unit is installed near infrared-sensitive unit, on the optical path of infrared-sensitive unit and incandescent lamp, with the shell perforate of infrared-sensitive unit, guarantee to shine infrared-sensitive unit when incandescent lamp is lighted, single-chip microcomputer is the driving signal of the bright incandescent lamp of output point regularly, after lighting incandescent lamp, gather the signal amplitude of infrared-sensitive unit again, this signal amplitude is stored in the single-chip microcomputer, background environment as this period, when the signal amplitude that collects infrared-sensitive unit in this period surpasses the background environment value, namely regard as infrared fire alarm.
It is the infrared transmitting tube of 0.89 μ m that infrared receiving tube 5 and infrared transmitting tube 2 adopt a pair of radiation peak, every 60s once drives infrared transmitting tube by single-chip microcomputer, make power valve export the infrared ray of 0.89 μ m, output time continues about about 100ms, detect the amplitude output signal of infrared receiving tube then, infrared receiving tube adopts electric resistance partial pressure, when receiving infrared radiation, can amplify shaping by the opto-electronic conversion output voltage signal through level sampling later, the output analog voltage signal, because of the receiving tube output signal fainter, therefore the gain of amplifying circuit design is bigger, suitably increases the inhibition of filtering and bandwidth, thereby has guaranteed stability and the output amplitude of signal.This simulating signal is directly sent into the AD port of single-chip microcomputer, after the AD conversion, after comparing with the alarm threshold value of setting, monitor the intensity variation that receiving tube receives like this, can obtain the window glass pollution level, the light intensity that receives when receiving tube drops to a certain degree, and single-chip microcomputer provides the pollution cue by the CAN bus.
Single-chip microcomputer is by the embedded-type ARM chip microcontroller, and this singlechip has 2 road CAN controllers, and therefore the CAN driving circuit of outside employing standard can be realized the CAN bus communication function of detector.
Gas in mine pipeline fire detector software flow is:
1) enters the starting stage;
2) remove quartz window 803 surfaces;
3) single-chip microcomputer 9 receives the infrared light that sends in the quartz window 803 by infrared receiving tube 5;
4) detect infrared receiving tube 5 light intensity;
5) infrared receiving tube 5 light intensity signals that detect are stored as standard value;
6) enter detection-phase;
7) single-chip microcomputer 9 receives the infrared light that sends in the quartz window 803 by infrared receiving tube 5;
8) detect infrared receiving tube 5 light intensity;
9) infrared receiving tube 5 light intensity signals and the standard value of starting stage that detects compared;
10) whether greater than; Being to change step 11, is not to change step 12);
11) quartz window 803 surperficial informations are removed in output, reenter step 6);
12) single-chip microcomputer 9 is by driving the work of standard source light, and whether the receiving light power signal that detects ultraviolet sensitivity unit 4 or infrared-sensitive unit 6 is normal, is not, changes step 13), is, changes step 14);
13) output ultraviolet sensitivity unit 4 or infrared-sensitive unit 6 circuit abnormality informations reenter step 6);
14) timesharing detects the receiving light power signal of ultraviolet sensitivity unit 4 or infrared-sensitive unit 6;
15) whether ultraviolet sensitivity unit 4 or infrared-sensitive unit 6 receiving light power signals arrive alarming value, are to change step 16), not to change step 17;
16) output gas pipeline fire alarm information reenters step 6);
17) reenter step 6).
Claims (8)
1. device that promotes gas in mine pipeline fire detector reliability, it is characterized in that: comprise detector housing (8), detector housing (8) indoor design has single-chip microcomputer (9), ultraviolet sensitivity unit (4), infrared-sensitive unit (6), quartz window (803), the outside has infrared receiving tube (5) and infrared transmitting tube (2) respectively in quartz window (803), ultraviolet sensitivity unit (4), infrared-sensitive unit (6), infrared receiving tube (5) and infrared transmitting tube (2) are electrically connected with single-chip microcomputer (9) respectively, single-chip microcomputer (9) is launched infrared light by control infrared transmitting tube (2) in quartz window (803), the infrared light that the infrared transmitting tube (2) that single-chip microcomputer (9) receives by detection infrared receiving tube (5) sends, to determine the light transmission of quartz window (803), if pollute greater than alarm threshold value, then provide the pollution cue immediately, single-chip microcomputer is set the alarm threshold value of ultraviolet sensitivity unit (4) and infrared-sensitive unit (6), by detecting ultraviolet 0.2 μ m that the burning of outside methane gas produces and the signal amplitude of infrared 2.7 μ m, provide fire alarm.
2. a kind of device that promotes gas in mine pipeline fire detector reliability according to claim 1, it is characterized in that: described detector housing (8) is the right cylinder of Φ 90 * 120mm, bottom (801) is the circular flange dish of Φ 220mm, the circular flange dish is connected with the mounting hole (802) of 8 Φ 18mm, the detector top is fused quartz window (803) optical window, quartz window (803), flange in the bottom dish and detector (804) junction all adopts packing washer to carry out encapsulation process, detector (804) indoor design has printed circuit board, ultraviolet sensitivity unit (4) is installed on the circuit board, infrared-sensitive unit (6), fire alarm, status indicator lamp (1) and infrared transmitting tube (2), wherein infrared transmitting tube (2) is installed in quartz window (803) outside, by lead signal is introduced printed circuit board, infrared receiving tube (5) is installed on detector (804) internal circuit board, and two pipes form 180 ° of correlation relations; By regularly detecting the electric signal of infrared transmitting tube (2), infrared receiving tube (5), realize quartz window (803) pollution detection.
3. a kind of device that promotes gas in mine pipeline fire detector reliability according to claim 1 is characterized in that: described quartz window (803) is the slope.
4. a kind of device that promotes gas in mine pipeline fire detector reliability according to claim 1, it is characterized in that: described ultraviolet sensitivity unit (4) and infrared-sensitive unit (6) are divided into ultraviolet light fulgurite and PbS infrared-sensitive unit.
5. a kind of device that promotes gas in mine pipeline fire detector reliability according to claim 1, it is characterized in that: described infrared-sensitive unit (6) locates to install the timing alignment that 1 miniature incandescent lamp is used for infrared-sensitive unit, on the optical path of infrared-sensitive unit and incandescent lamp, with the shell perforate of infrared-sensitive unit, guarantee to shine infrared-sensitive unit when incandescent lamp is lighted, single-chip microcomputer is the driving signal of the bright incandescent lamp of output point regularly, after lighting incandescent lamp, gather the signal amplitude of infrared-sensitive unit again, this signal amplitude is stored in the single-chip microcomputer, background environment as this period, when the signal amplitude that collects infrared-sensitive unit in this period surpasses the background environment value, namely regard as infrared fire alarm.
6. a kind of device that promotes gas in mine pipeline fire detector reliability according to claim 1, it is characterized in that: it is the infrared transmitting tube of 0.89 μ m that described infrared receiving tube (5) and infrared transmitting tube (2) adopt a pair of radiation peak, every 60s once drives infrared transmitting tube by single-chip microcomputer, make power valve export the infrared ray of 0.89 μ m, output time continues about about 100ms, detect the amplitude output signal of infrared receiving tube then, infrared receiving tube adopts electric resistance partial pressure, when receiving infrared radiation, by the opto-electronic conversion output voltage signal, amplify shaping through level sampling later, the output analog voltage signal, simulating signal is directly sent into the AD port of single-chip microcomputer, through after the AD conversion, after comparing with the alarm threshold value of setting.
7. a kind of device that promotes gas in mine pipeline fire detector reliability according to claim 1, it is characterized in that: described single-chip microcomputer is the embedded-type ARM single-chip microcomputer.
8. method that promotes gas in mine pipeline fire detector reliability, its method is:
1) enters the starting stage;
2) remove the quartz window surface;
3) single-chip microcomputer receives the infrared light that sends in the quartz window by infrared receiving tube;
4) detect the infrared receiving tube light intensity;
5) the infrared receiving tube light intensity signal that detects is stored as standard value;
6) enter detection-phase;
7) single-chip microcomputer receives the infrared light that sends in the quartz window by infrared receiving tube;
8) detect the infrared receiving tube light intensity;
9) the infrared receiving tube light intensity signal of detection and the standard value of starting stage are compared;
10) whether greater than; Being to change step 11), is not to change step 12);
11) quartz window surface information is removed in output, reenters step 6);
12) single-chip microcomputer is by driving the work of standard source light, and whether the receiving light power signal that detects ultraviolet sensitivity unit 4 or infrared-sensitive unit is normal, is not, changes step 13), is, changes step 14);
13) output ultraviolet sensitivity unit or infrared-sensitive unit circuit abnormality information reenters step 6);
14) timesharing detects the receiving light power signal of ultraviolet sensitivity unit or infrared-sensitive unit;
15) whether ultraviolet sensitivity unit or infrared-sensitive unit receiving light power signal arrives alarming value, is to change step 16), be not to change step 17);
16) output gas pipeline fire alarm information reenters step 6);
17) reenter step 6).
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| CN104833632A (en) * | 2015-04-07 | 2015-08-12 | 陈永奇 | High speed spark detector |
| CN105664400A (en) * | 2016-04-15 | 2016-06-15 | 中煤科工集团重庆研究院有限公司 | Quick automatic carbon dioxide flame and explosion suppression system |
| CN105931418A (en) * | 2016-07-11 | 2016-09-07 | 安徽升隆电气有限公司 | Explosion-proofing infrared UV flame detector |
| CN106404671A (en) * | 2016-10-26 | 2017-02-15 | 桂林电子科技大学 | OH free-radical gas reaction cavity |
| CN110375812A (en) * | 2019-08-19 | 2019-10-25 | 李秀利 | A kind of smart city environment friendly system and its working method |
| CN111141469A (en) * | 2020-01-16 | 2020-05-12 | 西安博深安全科技股份有限公司 | Powder leakage detection device of mining powder-spraying explosion suppressor |
| CN114487720A (en) * | 2020-11-12 | 2022-05-13 | 宁波阿贝尼红外技术有限公司 | Photoelectric sensor for discharge detection and discharge detection alarm method |
| CN117589292A (en) * | 2024-01-18 | 2024-02-23 | 太原晋贵信息技术服务中心 | Two-in-one flame detector for double-red-one-purple fire explosion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117589292A (en) * | 2024-01-18 | 2024-02-23 | 太原晋贵信息技术服务中心 | Two-in-one flame detector for double-red-one-purple fire explosion |
| CN117589292B (en) * | 2024-01-18 | 2024-04-26 | 太原晋贵信息技术服务中心 | Two-in-one flame detector for double-red-one-purple fire explosion |
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| CN103198604B (en) | 2015-12-02 |
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