CN104405444B - Downhole coal mine data transmission device - Google Patents
Downhole coal mine data transmission device Download PDFInfo
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- CN104405444B CN104405444B CN201410561440.4A CN201410561440A CN104405444B CN 104405444 B CN104405444 B CN 104405444B CN 201410561440 A CN201410561440 A CN 201410561440A CN 104405444 B CN104405444 B CN 104405444B
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- 239000003245 coal Substances 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 36
- 238000004891 communication Methods 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 229910052594 sapphire Inorganic materials 0.000 claims description 5
- 239000010980 sapphire Substances 0.000 claims description 5
- 238000007084 catalytic combustion reaction Methods 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000012806 monitoring device Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 230000002159 abnormal effect Effects 0.000 abstract description 9
- 230000007423 decrease Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 239000000567 combustion gas Substances 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses downhole coal mine data transmission device, including data acquisition module, data processing module and control module, data acquisition module is connected with data processing module, and data processing module is also connected with control module.The present invention can receive the data such as the temperature of downhole coal mine, pressure, time, gas bearing capacity in time, when occurring abnormal, controller controls buzzer and sends sound, staff is reminded to note, after staff hears the sound of buzzer, the image information transmitted by watch-dog observes the practical situation in downhole coal mine, notifies that related personnel processes in time, notify that miner withdraws from downhole coal mine in time, it is ensured that the personal safety of miner.The present invention is reliable and stable, decreases data transmission channel, reduces operating cost.
Description
Technical field
The present invention relates to technical field of data transmission, specifically a kind of downhole coal mine data transmission device.
Background technology
China's coal-mine casualty accident major part is to note abnormalities in time owing to failing, although the downhole coal mine having installs some preventive measures,
But it is the most complicated that the practical situation of downhole coal mine feeds back to device entirety on the ground, power consumption is big, reliability is low, reaction
Not in time；Data message and image information are uploaded by two passages, and operating cost is high.
The most existing HDMI data line transmission range is the shortest, if extending merely the length of data line to increase transmission
Distance, will certainly cause signal attenuation, therefore, be necessary to provide a kind of HDMI data extended transmission distance to transmit in fact
Line.
Patent No. CN103267229A discloses a kind of industrial gas data acquisition and supervising device, it is possible to ensure course of gas data
Integrity and accuracy, but it can not know other parameter in colliery, can not warn the exception that people occur in time
Problem.
Summary of the invention
It is an object of the invention to provide a kind of quick, safe downhole coal mine data transmission device, to solve above-mentioned background technology carries
The problem gone out.
For achieving the above object, the present invention provides following technical scheme:
Downhole coal mine data transmission device, including data acquisition module, data processing module and control module, data acquisition module and number
Connecting according to processing module, data processing module is also connected with control module.
As the further scheme of the present invention: acquisition module is for gathering the data message of downhole coal mine, including temperature sensor, pressure
Sensor, clock chip, gas security.
As the further scheme of the present invention: temperature sensor uses non-contact temperature sensor, pressure transducer uses sapphire formula
Pressure transducer, gas security uses catalytic combustion sensor, and clock chip uses DS1302 chip.
As the further scheme of the present invention: acquisition module also includes watch-dog.
As the further scheme of the present invention: data processing module is for processing data that acquisition module collects and being transmitted to control
Module；Data processing module uses ARM single-chip microcomputer, and data processing module includes data acquisition facility and communication module；When adopting
When comprising watch-dog in collection module, data processing module also includes decoder.
As the further scheme of the present invention: communication module include data line A and data line B, data line A with
Data acquisition module connects, and data line B is connected with control module.
As the further scheme of the present invention: control module includes buzzer, controller and liquid crystal display, controller uses
MSP430 single-chip microcomputer, controller is judged by the data transmitting data processing module, is analyzed, and passes through liquid crystal display
Device shows.
Compared with prior art, the invention has the beneficial effects as follows: the present invention can receive in time the temperature of downhole coal mine, pressure, time
Between, the data such as gas bearing capacity, when occurring abnormal, controller controls buzzer and sends sound, reminds staff to note, work
After personnel hear the sound of buzzer, the image information transmitted by watch-dog observes the practical situation in downhole coal mine, leads in time
Know that related personnel processes, notify that miner withdraws from downhole coal mine in time, it is ensured that the personal safety of miner.The present invention stably may be used
Lean on, decrease data transmission channel, reduce operating cost.
Accompanying drawing explanation
Fig. 1 is the downhole coal mine data transmission device structured flowchart without watch-dog；
Fig. 2 is the structured flowchart that downhole coal mine data transmission device contains watch-dog；
Fig. 3 is the structural representation of data line；
Fig. 4 is the internal structure schematic diagram of data line.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that institute
The embodiment described is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly falls into the present invention
The scope of protection.
Embodiment 1
In the embodiment of the present invention, downhole coal mine data transmission device, including data acquisition module, data processing module and control module,
Data acquisition module is connected with data processing module, and data processing module is also connected with control module.
Acquisition module, for gathering the data message of downhole coal mine, passes including temperature sensor, pressure transducer, clock chip, combustion gas
Sensor.
Temperature sensor uses non-contact temperature sensor, when the temperature of the downhole coal mine sensed is transferred to by temperature sensor in time
Data processing module, so as to find temperature anomaly in time, the measurement upper limit of non-contact temperature sensor is not by temperature-sensing element
The restriction of heatproof degree, thus the highest observable temperature is not the most limited.For more than 1800 DEG C high temperature, mainly adopt
Use non-contact temperature measuring method.Along with the development of infrared technique, radiation temperature measurement gradually by visible ray to infrared ray extend, 700 DEG C with
Lower until room temperature is employed, and resolution is the highest.
Pressure transducer uses sapphire formula pressure transducer, uses silicon-on-sapphire as semiconductor sensitive element, has unrivaled
Meter characteristic.The pressure transducer manufactured with silicon-on-sapphire semiconductor sensitive element, can under worst working condition just
Often work, and reliability is high, precision is good, temperature error is minimum, cost performance is high.When the down-hole that pressure transducer will sense
The pressure in colliery is transferred to data processing module in time, so as to find pressure anomaly in time.
Gas security uses catalytic combustion sensor, and catalytic combustion sensor is by the porous being loaded with the noble metal catalyst such as platinum or palladium
Alumina coated is constituted on platinum coil, and imflammable gas burns with catalyst contact so that platinum coil
Resistance changes thus the existence of perception combustion gas.Gas security is by timely for the situation of the gas leakage of the downhole coal mine sensed
It is transferred to data processing module, so as to find that in time combustion gas is abnormal, the blast that causes with pre-gas leakage prevention and not exclusively
The poisoning that burning causes.Combustion gas refers to gas, the gas such as including methane, ethane, hydrogen sulfide and carbon dioxide.
Clock chip uses DS1302 chip, is a kind of high-performance, low-power consumption, the real time clock circuit of band RAM, and it can be right
Year, month, day, Sunday, time, minute, second carry out timing, have the leap year compensate function, running voltage is 2.5V～5.5V.
Clock chip is connected with temperature sensor, pressure transducer, gas security respectively, by temperature sensor, pressure transducer,
Temperature that gas security detects respectively, pressure, time and the temperature of gas leakage, pressure, gas leakage data simultaneously
It is transferred to data processing module.
Data processing module is for processing data that acquisition module collects and being transmitted to control module.Data processing module uses
ARM single-chip microcomputer, data processing module includes data acquisition facility and communication module, is obtained by data acquisition facility and gathers mould
The data that block collects, are transferred to control module by communication module.Communication module includes that data line A transmits with data
Line B, data line A are connected with data acquisition module, and data line B is connected with control module.
Refer to Fig. 3 and Fig. 4, data line, connect including source joint connector, receiving terminal joint connector and connection source
Head connector and the cable of receiving terminal joint connector.Described data line is additionally provided with and is connected to receiving terminal joint connector
RC filter circuit.Data line includes source HDMI joint connector, receiving terminal HDMI joint connector, connection
In the RC filter circuit of receiving terminal HDMI joint connector and connect source HDMI joint connector and RC filter circuit
Cable.Described source HDMI joint connector is identical with receiving terminal HDMI joint connector structure, all includes that insulation is originally
Body, the conducting terminal being immobilizated in insulating body and shade shield shell outside insulating body.
HDMI joint connector is HDMI A Type.This HDMI joint connector has nineteen conducting terminal, wherein,
One conducting terminal and the 3rd conducting terminal form the first differential pair terminal group, the 4th conducting terminal and the 6th conducting terminal composition second
Differential pair terminal group, the 7th conducting terminal and the 9th conducting terminal composition the 3rd differential pair terminal group, the tenth conducting terminal and the tenth
Two conducting terminal composition the 4th differential pair terminal group.First differential pair terminal group, the second differential pair terminal group and the 3rd difference opposite end
Subgroup is used for transmission pulse signal, and the 4th differential pair terminal group is used for transfer clock signal.CN1 end corresponds to source and setting
There is source HDMI joint connector；CN2 end corresponds to receiving terminal and is provided with receiving terminal HDMI joint connector；
Terminal 1-19 corresponds to the first to ten nine conducting terminal of HDMI joint connector respectively.Described CN1 end HDMI connects
The terminal 1-19 of head connector is the most corresponding with the wire of cable to be connected, it is achieved electrically conduct.Described CN2 end
In HDMI joint connector, the first differential pair terminal group, the second differential pair terminal group, the 3rd differential pair terminal group and the 4th
Differential pair terminal group is connected to RC filter circuit, i.e. the terminal of CN2 end HDMI joint connector 1,3,4,
6,7,9,10,12 connections have RC filter circuit, and RC filter circuit reconnects the wire of cable；Other terminals 2,
5,8,11,13,14,15,16,17,18,19 wire being directly connected to cable.At CN2 end, terminal 1,3,
4,6,7,9,10,12 (i.e. signal transmission terminals) have RC filter circuit, according to the present embodiment with being connected between cable
Needing, RC filter circuit design is high pass circuit, is filtered by low frequency noise, allows high-frequency signal pass through.Described RC filters
Circuit includes resistance and electric capacity, and described electric capacity and resistance are parallel connectivity.In other embodiments, CN2 end
Also can be connected between signal transmission terminal and the cable of HDMI joint connector and have another RC filter circuit.
When signal transmits in media as well, signal is decayed.The principal element of impact decay has: dielectric loss, metal loss, radiation
Loss, signal self character and load characteristic.The method generally tackling decay and extend transmission distance has: increase the merit of signal source
Rate, increase relaying or less decay.It is connected between receiving terminal, signal transmission terminal and cable and has high pass RC filter circuit,
Low frequency noise is filtered by high pass RC filter circuit, allows high-frequency signal pass through, and makes receiving terminal be easier to identify actually useful letter
Number.In the case of other conditions are identical, can be easier to identify really to have owing to being provided with the data line of RC filter circuit
Signal, therefore, this data line proper extension transmission range, receiving terminal also available signal clearly.
Control module includes buzzer, controller and liquid crystal display, and controller uses MSP430 single-chip microcomputer, and controller passes through logarithm
Carry out judging, analyzing according to the temperature of processing module transmission, pressure, time, the data of gas bearing capacity, and pass through liquid crystal display
Display, if when temperature or appearance of abnormal pressure, controller controls buzzer and sends sound, reminds staff to note, work
After personnel hear the sound of buzzer, notify that related personnel processes in time；If the content of gas exceeds threshold value, controller
Send control signal, the alarm being transferred in downhole coal mine, points out gas bearing capacity and occurs abnormal, notify relevant people in time
Member processes, and notifies that miner withdraws from downhole coal mine in time, it is ensured that the personal safety of miner.
Embodiment 2
Referring to Fig. 2, in the embodiment of the present invention, downhole coal mine data transmission device, acquisition module is except comprising in embodiment 1
Parts, it is also possible to increase watch-dog.Watch-dog can be arranged on critical positions as required, so as to sees underground coal in time
The situation in ore deposit, watch-dog is connected with data processing module by data line.When acquisition module comprises watch-dog, data
Processing module also includes decoder, obtains, by data acquisition facility, the data that acquisition module collects, is solved by decoder
Code, decoded data are transferred to control module by communication module.Decoder uses LD-600xD multi-channel decoder, video
H.264 compression standard is, LD-600xD multi-channel decoder is to design with managing for disposing of large-scale tv wall supervising device
Network decoder, has powerful Decode engine, and an equipment is supported multipath decoding, reduced the deployment of large-scale supervising device
Cost.The decoding output of the every the highest support in road 4CIF, supports DCIF, 2CIF, CIF, QCIF simultaneously；Input video source is
Network Real Time Compression code stream.
Controller in control module is sentenced by the temperature transmitting data processing module, pressure, time, the data of gas bearing capacity
Disconnected, analysis, and shown by liquid crystal display, if when temperature or appearance of abnormal pressure, controller controls buzzer and sends sound
Sound, reminds staff to note, after staff hears the sound of buzzer, the image information transmitted by watch-dog observes well
Practical situation in lower colliery, notifies that related personnel processes in time；If the content of gas exceeds threshold value, controller sends
Control signal, the alarm being transferred in downhole coal mine, point out gas bearing capacity and occur abnormal, staff can be by prison
The image information of control device transmission observes the practical situation in downhole coal mine, notifies that related personnel processes in time, notify miner and
Time withdraw from downhole coal mine, it is ensured that the personal safety of miner.
By test, within the time of 1 year, respectively choose install embodiment 1, embodiment 2 data transmission device with do not install appoint
30 downhole coal mines of what preventing mean, when the temperature of downhole coal mine, pressure, gas bearing capacity occur abnormal, embodiment 1
All can receive abnormal conditions in time in the very first time with embodiment 2, process in time.Particularly by monitoring in embodiment 2
Device is understood actual dynamic in time, adjusts in time, assigns correct order, it is ensured that the safety of miner, 1 accident does not occurs, it is to avoid
Economic loss.And any preventing mean downhole coal mine is not installed, there are 3 accidents altogether, when temperature, pressure, gas bearing capacity go out
When existing exception is inconspicuous, miner does not has the time of abundance to process and withdraw at all, causes certain loss.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and without departing substantially from this
In the case of bright spirit or essential attributes, it is possible to realize the present invention in other specific forms.Which point therefore, no matter from come
Seeing, all should regard embodiment as exemplary, and be nonrestrictive, the scope of the present invention is by claims not
It is that described above limits, it is intended that all changes fallen in the implication of equivalency and scope of claim are included at this
In invention.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only comprises one solely
Vertical technical scheme, this narrating mode of description is only that for clarity sake description should be made by those skilled in the art
Be an entirety, the technical scheme in each embodiment can also through appropriately combined, formed it will be appreciated by those skilled in the art that its
His embodiment.
Claims (5)
1. downhole coal mine data transmission device, it is characterised in that include data acquisition module, data processing module and control module,
Data acquisition module is connected with data processing module, and data processing module is also connected with control module；Described data processing module is used
In processing the data that collect of acquisition module and being transmitted to control module；Data processing module uses ARM single-chip microcomputer, number
Data acquisition facility and communication module is included according to processing module；When comprising watch-dog in acquisition module, data processing module also wraps
Include decoder；Described communication module includes data line A and data line B, data line A and data acquisition module
Block connects, and data line B is connected with control module；Data line includes source HDMI joint connector, receiving terminal
HDMI joint connector, the RC filter circuit being connected to receiving terminal HDMI joint connector and connection source HDMI joint
Adapter and the cable of RC filter circuit, HDMI joint connector is HDMI A Type, this HDMI joint connector
There is nineteen conducting terminal, the first conducting terminal and the 3rd conducting terminal and form the first differential pair terminal group, the 4th conducting terminal
The second differential pair terminal group, the 7th conducting terminal and the 9th conducting terminal composition the 3rd differential pair terminal is formed with the 6th conducting terminal
Group, the tenth conducting terminal and the 12nd conducting terminal composition the 4th differential pair terminal group, the first differential pair terminal group, the second difference
Terminal group and the 3rd differential pair terminal group are used for transfer clock signal for transmission pulse signal, the 4th differential pair terminal group,
CN1 end corresponds to source and is provided with source HDMI joint connector；CN2 end corresponds to receiving terminal and is provided with reception
End HDMI joint connector；Terminal 1-19 corresponds to the first to ten nine conducting terminal of HDMI joint connector respectively,
The terminal 1-19 of described CN1 end HDMI joint connector is the most corresponding with the wire of cable to be connected, it is achieved electrically lead
Logical, in described CN2 end HDMI joint connector, the first differential pair terminal group, the second differential pair terminal group, the 3rd difference
Terminal group and the 4th differential pair terminal group are connected to RC filter circuit, i.e. the end of CN2 end HDMI joint connector
Son 1,3,4,6,7,9,10,12 connects RC filter circuit, and RC filter circuit reconnects the wire of cable；Other
Terminal 2,5,8,11,13,14,15,16,17,18,19 is directly connected to the wire of cable, at CN2 end, terminal
1,3,4,6,7,9,10,12 are that is connected between signal transmission terminal and cable and have RC filter circuit, RC filter circuit
It is designed as high pass circuit, low frequency noise is filtered, allows high-frequency signal pass through.
Downhole coal mine data transmission device the most according to claim 1, it is characterised in that described acquisition module is used for production wells
The data message in lower colliery, including temperature sensor, pressure transducer, clock chip, gas security.
Downhole coal mine data transmission device the most according to claim 2, it is characterised in that described temperature sensor uses non-connecing
Touch temperature sensor, pressure transducer uses sapphire formula pressure transducer, and gas security uses catalytic combustion sensor,
Clock chip uses DS1302 chip.
Downhole coal mine data transmission device the most according to claim 2, it is characterised in that described acquisition module also includes monitoring
Device.
Downhole coal mine data transmission device the most according to claim 1, it is characterised in that described control module includes buzzing
Device, controller and liquid crystal display, controller uses MSP430 single-chip microcomputer, and controller is by transmitting data processing module
Data carry out judging, analyzing, and are shown by liquid crystal display.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561440.4A CN104405444B (en) | 2014-10-21 | 2014-10-21 | Downhole coal mine data transmission device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561440.4A CN104405444B (en) | 2014-10-21 | 2014-10-21 | Downhole coal mine data transmission device |
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| CN104405444A CN104405444A (en) | 2015-03-11 |
| CN104405444B true CN104405444B (en) | 2016-09-14 |
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| CN106005955A (en) * | 2016-05-28 | 2016-10-12 | 许昌东方热力有限公司 | Coal conveying monitoring system |
| CN111130056B (en) * | 2020-01-02 | 2022-03-01 | 天地（常州）自动化股份有限公司 | Monitoring method and device |
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| CN2711390Y (en) * | 2004-06-16 | 2005-07-20 | 北京泰安特科技有限公司 | Monitoring commanding device for disaster dealing of mine |
| CN101260813A (en) * | 2008-04-29 | 2008-09-10 | 泰安市国华科技机电设备有限公司 | Mining intelligent substation |
| CN102312681A (en) * | 2011-08-01 | 2012-01-11 | 煤炭科学研究总院 | Environment monitoring device for underground shelter |
| CN102619562B (en) * | 2012-04-05 | 2014-06-11 | 山东科技大学 | Instrument for monitoring gas emission quantity in roadway |
| CN203175617U (en) * | 2013-03-20 | 2013-09-04 | 刘胜利 | Coal mine safety monitoring system based on CAN bus |
| CN203702257U (en) * | 2014-01-11 | 2014-07-09 | 西安科技大学 | Mine temperature detecting and monitoring device |
| CN203769854U (en) * | 2014-03-21 | 2014-08-13 | 宿州学院 | Coal mine gas safety detection control device based on single chip microcomputer |
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