CN101881183A - Underground monitoring network system based on ZigBee network nodes - Google Patents
Underground monitoring network system based on ZigBee network nodes Download PDFInfo
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Abstract
The invention discloses a monitoring network system based on ZigBee network nodes, which comprises a ground safety monitoring system, a ZigBee wireless sensor network and a CAN network, wherein the ground safety monitoring system collects and analyzes various kinds of underground data, judges an underground safety condition according to the underground data, decides a dealing measure and issues early-warning information, the ZigBee wireless sensor network collects the parameters of an underground environment and the data of personal information, and the CAN network is connected with the ground safety monitoring system and the underground ZigBee wireless sensor network; and information issued by the ground safety monitoring system to an underground part is transmitted to the ZigBee wireless sensor network. The invention adopts a wireless sensor network technology, i.e. a ZigBee and is a self-organization wireless network taking data as a center, and nodes in the network are dense, have large number and are disposed at a very extensive area; the topological structure of the network is dynamically changed, and the network has the properties of self organization and self regulation; and the invention combines the function of the data transmission mode of a traditional coal mine safety system and has very good flexibility, extensibility, self-organization capability of the network, low cost, low power consumption and high safety and reliability.
Description
Technical field
The invention belongs to the coal mine downhole safety monitoring technical field, be specifically related to a kind of underground monitoring network system based on the ZigBee network node.
Background technology
Coal occupies extremely important strategic position as the basic power source and the important source material of China in national economy.In the energy resource structure of China, coal accounts for about 70% in disposable production of energy of China and the consumption structure, expects the year two thousand fifty will account for more than 50%.Therefore, coal will be the main energy sources of China in quite long period, will be difficult to change in a short time based on the energy resource structure of coal.
Recently, along with the increase to coal demand, the China's coal-mine accident has soaring trend again, and mine safety status is troubling.The networked degree of China's coal-mine security information technology is not high, and downhole safety information can not in time be sent to aboveground safety in production control centre, is to cause one of major reason that coal mining accident takes place frequently.The existing safety of coal mines information system of China is set up by cable network mostly, variation day by day along with coal mining, physical arrangement under the coal mine is changing with rapid changepl. never-ending changes and improvementsly, the cable network transmission system that originally designed is difficult to accomplish monitor completely covering, rebulid new wired network system, on the cost, on the manpower, aspect such as autgmentability all do not meet the development of actual conditions.Therefore, set up a cover flexibly, safety of coal mines wireless monitor network reliable, that autgmentability is strong is extremely urgent.
Along with the develop rapidly of sensor technology, embedded computing technique, the communication technology and semiconductor and MEMS manufacturing technology, the microsensor with perception, calculating storage and communication capacity begins to occur in military, industry, agricultural and aerospace every field.Wireless network sensor is to integrate sensor and actor, controller and communicator; Integrate sensing and the limited embedded device of resource (calculating, storage and the energy) that drives control ability, computing capability, communication capacity.Various monitoring target information in wireless sensor network monitoring in real time, perception and the collection network distributed areas that constitute by these microsensors, and these information are handled, send the user who needs these information to.Sensor network has wide application prospect in fields such as military surveillance, environmental information, detection, agricultural production, medical treatment ﹠ health monitoring, building and household, industrial production control and commerce.
Bluetooth technology is a kind of of wireless telecommunications, in the use of Bluetooth technology, although it is found that Bluetooth technology many advantages is arranged, but still has many defectives.To industry, it is too complicated that home automation control and industrial telemetry field of remote control, Bluetooth technology seem, power consumption is big, distance is near, the networking scale is too little etc., and industrial automation is more and more stronger to the demand of wireless data communications, and, for industry spot, this wireless data transmission must be highly reliable, and can resist the various electromagnetic interference of industry spot.Therefore, through people's long-term endeavour, the Zigbee agreement is formal the appearance in 2003.Zigbee is the synonym of IEEE 802.15.4 agreement.Technology according to this agreement regulation is the wireless communication technology of a kind of short distance, low-power consumption.In addition, Zigbee has used the communication protocol Home RF Lite towards home network that was studied before it.
At present, China's mining area monitoring technique has also developed into automatic monitoring and monitoring from manual monitoring, monitoring system to work condition inspection and production monitoring, and has progressively formed the mining area monitor network from the Environmental security monitoring development, for the mining area produces and the modernization of management provides good condition.The mine supervision technology that external the 60 to 70's grows up has had development at full speed in China in recent years, and various mine supervision systems and auxiliary products thereof arise at the historic moment.
The personnel in the pit of Dalian mine safety scientific and technical research institute locatees management system for tracking.This system is collection automatic control technology, REID, network communications technology etc., and multidisciplinary synthesis is applied as the automatic identification information system of one.This system handles by the remote moving target in tunnel being carried out contactless information gathering, realize to people's car thing move at different conditions, static automatic identification down, thereby the automatic management of realization target.
Institute of Computing Technology, CAS has been researched and developed sensor-based network technology moulded coal ore deposit, down-hole wireless composite monitoring system, and this system has utilized characteristics such as the distinctive self-organizing of wireless sensor network, data type multi-hop route, low cost.
Based on above-mentioned, at present, the method that the China's coal-mine underground safety monitoring system adopts monitoring of tools and manual monitoring to combine mostly, this type of safety monitoring system is having very big weak point aspect system cost, reliability and the personal security.
At first, owing to need to build line transmission system, therefore limited the expansion of network size based on the safety monitoring system of cable network to a great extent.Along with constantly pushing ahead of production face, production program changes with the distribution situation of underground coal, do not catch up with the actual requirement of exploitation based on the expansion of the safety monitoring system of cable network, make that the data reliability of network and real-time can not get guaranteeing, be difficult to guarantee that the detection data of important secure data, control data and downhole gauges transmit timely.This just becomes coal mine safety monitoring system employing cable network is the maximum not enough of transmission medium.
Secondly, manual supervisory scheme is practical experience the predicting dangerous situation that relies on the professional to enrich.Because such professional's limited amount is considered the randomness of supervisor to each range check simultaneously, cause to cover the down-hole All Ranges.And gas can reduce oxygen content when content is high in air, causes and suffocates, and arrives information gathering point in person and gathers gas information, also has collection personnel's personal safety problem.
Summary of the invention
Deficiency at the existing technical existence of coal mine safety monitoring system, the present invention seeks to be to provide a kind of by the network communication of wireless sensor mode, network topology structure dynamic change, network have the monitoring network system based on the ZigBee network node of self-organizing and self-adjusting characteristic.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of monitoring network system based on the ZigBee network node, it is characterized in that, comprise the ground safety monitoring system that adopts Internet network issue relevant information, Information management networks, the ZigBee wireless sensor network of ambient parameter and personal information data and the CAN network that is connected ground safety monitoring system and down-hole ZigBee wireless sensor network under the production wells, described ground safety monitoring system is collected the various data of down-hole, analyze, and the judgement of downhole safety situation according to this, the decision-making of counter-measure and the issue of early warning information, it will need to the down-hole information releasing by CAN network destined ZigBee wireless sensor network.
Further, described ZigBee wireless sensor network comprises the portable mobile node of ambient parameter and personal information data under the production wells, receives the detection data that mobile node sends and the mine laneway fixed-node and the ZigBee-CAN gateway that is connected the ground safety monitoring system by the CAN network of self-collected data; Described mine laneway fixed-node transmits the ZigBee-CAN gateway with data and the self-collected data that mobile node sends by ZigBee, and gateway arrives the ground safety monitoring system with these data by wired fieldbus (CAN) forwarded.
Further, described mine laneway fixed-node is the ZigBee network router, described portable mobile node is the ZigBee network node, and described ZigBee network node comprises ZigBee transceiver, PMU, Temperature Humidity Sensor, gas concentration sensor, warning device and power amplification circuit; Described PMU, Temperature Humidity Sensor, gas concentration sensor, warning device and power amplification circuit all are connected by circuit with the ZigBee transceiver.
Further, described ZigBee transceiver also is connected with some running parameter that is used for node and is provided with, the man-machine interface that the working condition and the ambient parameter of node are checked, be used for some running parameter of node is provided with, the working condition and the ambient parameter of node are checked etc.
Further, described man-machine interface comprises and is used for button that some running parameter to node is provided with and the display that the working condition and the ambient parameter of node are checked.
Further, what described ZigBee transceiver adopted is the CC2530 microprocessor, low in energy consumption, safe and reliable.
Mine laneway fixed-node of the present invention transmits the ZigBee-CAN gateway with data and the self-collected data that portable mobile node sends by ZigBee, gateway arrives the ground safety monitoring system with these data by wired fieldbus (CAN) forwarded, and the ground safety monitoring system adopts Internet network issue relevant information.Safety monitoring center is collected, is analyzed the various data of down-hole, and judgement, the decision-making of counter-measure and the issue of early warning information of downhole safety situation according to this, it will need to the down-hole information releasing by CAN network destined ZigBee-CAN gateway, the ZigBee-CAN gateway passes through this information the portable mobile node of ZigBee network destined appointment again, or carries out the whole network broadcasting.
The present invention fundamentally solves the defective that existing monitoring system exists; It adopts up-to-date wireless sensor network technology is ZigBee, compares with traditional network, and it is a kind of data-centered ad hoc deployed wireless networks, and the node in the network is intensive, enormous amount and be deployed in zone very widely; Network topology structure dynamic change, network have self-organizing and self-adjusting characteristic; The function of the compatible existing safety of coal mines system data transmission means of the present invention, has good flexibility, extensibility, the ability of self-organizing network, and have advantages such as cost is low, volume is little, low in energy consumption, safe and reliable, be mainly used in real-time monitoring, transmission and the processing of data such as temperature under the coal mine, humidity, gas density; The gas accident that occurs is carried out early warning and security monitoring support; Data such as subsurface environment parameter and underground operators information are shown on electronic map in real time; Allow medium and public's remote access and inquiry for information about.
Description of drawings
Fig. 1 is a network structure block diagram of the present invention;
Fig. 2 is the module frame chart of the ZigBee network node of coal mine downhole safety monitoring system of the present invention;
Fig. 3 is a CC2530 typical application circuit of the present invention;
Fig. 4 is rf power amplifier circuit figure of the present invention;
Fig. 5 is a SHT11 built-in function block diagram of the present invention;
Fig. 6 is the connecting circuit figure of SHT11 of the present invention and main frame;
Fig. 7 is a gas concentration sensor operating principle schematic diagram of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with the specific embodiment, further set forth the present invention.
Referring to Fig. 1, the present invention is directed to the diversity of present various safety of coal mines products, and the polytropy in space, down-hole in the process of coal mining, and provide the function of the existing safety of coal mines system data of a kind of compatibility transmission means, has good flexibility, extensibility, the monitoring network system based on the ZigBee network node of self-organizing network ability, it comprises the ground safety monitoring system that adopts Internet network issue relevant information, Information management networks, be arranged on the down-hole, and ambient parameter such as temperature under the production wells, humidity, the ZigBee wireless sensor network and the CAN network that is connected ground safety monitoring system and down-hole ZigBee wireless sensor network of data such as gas density and personnel in the pit's information data.This ZigBee wireless sensor network is with the ambient parameter such as the temperature of gathering, humidity, data such as gas density and personnel in the pit's information data by fieldbus (CAN) forwarded to the ground safety monitoring system, this ground safety monitoring system is collected the various data of down-hole, analyze, and the judgement of downhole safety situation according to this, the decision-making of counter-measure and the issue of early warning information, it will need to the down-hole information releasing again by CAN network destined ZigBee wireless sensor network, pass through the ZigBee network node of ZigBee network destined appointment again, or carry out the whole network broadcasting.
What deserves to be mentioned is, the present invention mainly is responsible for extending to from the eye zone of work plane, this underground monitoring network system adopts ZigBee, each mine can be to be considered as a ZigBee wireless sensor network, mainly form: (1) mine laneway fixed-node: the main nodes of forming wireless sensor network by three parts, the router that can serve as the ZigBee network simultaneously is with wireless sensor network wireless multi-hop transmission means transmission data; (2) portable mobile node: the node that the underground work personnel carry also is each personnel's a identity marks, is used for ambient parameter and personal information data under the production wells; (3) ZigBee-CAN gateway: the conversion equipment that is connected of underground wireless network and ground cable network also is the telegon of ZigBee network simultaneously, promptly is the organizer and the manager of underground wireless network.
The mine laneway fixed-node transmits the ZigBee-CAN gateway with data and the self-collected data that mobile node sends by ZigBee, and this ZigBee-CAN gateway arrives the ground safety monitoring system with these data by wired fieldbus (CAN) forwarded.Safety monitoring system is collected, is analyzed the various data of down-hole, and judgement, the decision-making of counter-measure and the issue of early warning information of downhole safety situation according to this, it will need to the down-hole information releasing by CAN network destined ZigBee-CAN gateway, the ZigBee-CAN gateway passes through this information the node of ZigBee network destined appointment again, or carries out the whole network broadcasting.
In the present embodiment, referring to Fig. 2, portable mobile node is the ZigBee network node, is the key component in the coal mine downhole safety monitoring system, and is the source of subsurface environment parameter and personal information data.This ZigBee network node mainly is made up of ZigBee transceiver, PMU, Temperature Humidity Sensor, gas concentration sensor, warning device, man-machine interface and power amplification circuit; Its each several part function is as follows:
1, ZigBee transceiver; The function of ZigBee terminal node is that various sensors cooperate the composition intelligence sensor, carry out functions such as the collection of environmental datas such as humiture, gas density, personnel positioning and analysis, its function is simple relatively, but demand is big, therefore will fully take into account the problem of system cost.Based on above demand, the ZigBee transceiver adopts the primary processor of CC2530 microprocessor as ZigBee network terminal node in the native system.
CC2530 uses the SOC(system on a chip) (SoC that provides for 2.4GHz IEEE 802.15.4 and ZigBee, System on Chip) solution, efficient 8051 controllers of it is an integrated high-performance 2.4GHz DSSS (DSSS) radio-frequency (RF) transceiver core and a technical grade, can satisfy based on the 2.4GHz ISM wave band of ZigBee and use to low cost the requirement of low-power consumption.
Referring to Fig. 3, this CC2530 microprocessor contains the CC2530 chip and prolongs the framework of having used existing CC2430 chip, has integrated ZigBee radio-frequency front-end, program storage, datarams and microcontroller core on single chip.It uses 18 MCU (8051), RAM with 256KB flash memory able to programme and 8KB, the park mode timer, electrify restoration circuit (Power OnReset), the power-fail detection circuit (Brown out detection) that also comprise analog-digital converter (ADC), several timer (Timer), AES128 coprocessor, WatchDog Timer (Watchdog timer), 32kHz crystal oscillator, and 21 programmable I/O pins.The CC2530 chip adopts 0.18 μ m CMOS explained hereafter, and under reception and emission mode, current loss is lower than 27mA and 25mA respectively.The park mode of CC2530 and the characteristic that is transformed into the ultrashort time of aggressive mode are particularly suitable for those and require the very long application of battery life.The main feature of CC2530 chip is as follows:
● the 8051 microcontrollers nuclear of high-performance and low-power consumption
● the integrated RF wireless transceiver that meets the 2.4GHz of I EEE802.15.4 standard
● good wireless receiving sensitivity and powerful anti-interference
● only the stream of 0.9 μ A consumes when park mode, outside interruption or RTC energy waken system; Be less than the stream consumption of 0.6 μ A when standby mode, outside interruption can waken system
● hardware supported CSMA/CA function
● the voltage range (2.0～3.6V) of broad
● digitized received signal intensity indication (RSSI/LQI) is supported and powerful DMA function
● have battery detection and temperature sensing function
● integrated 14 analog-to-digital ADC
● integrated AES security coprocessor
● have the USART of 2 powerful several groups of agreements of support, and 1 MAC timer that meets IEEE 802.15.4 standard, 16 bit timers of 1 routine and 28 bit timers
● powerful and developing instrument flexibly
The CC2530 chip only needs peripheral components seldom to cooperate the transmission-receiving function that just can realize signal, and its typical application circuit as shown in Figure 3.
2, radio-frequency enabled amplifying circuit; The colliery subsurface environment is abominable, especially electromagnetic environment complexity, can have influence on the transmission quality of wireless signal, and when certain router/node exits network because of some reason such as power shortage or mine explosion etc., router/the node that needs other router/node can replace exitting network is carried out its function in network, require router/node suitably to increase its radio frequency power output when therefore needing, increase network coverage.
Present embodiment adopts be the CC2591 radio frequency front end chip as the power amplifier in the rf power amplifier circuit, the interface of itself and CC2530 and peripheral circuit are as shown in Figure 4.
3, Temperature Humidity Sensor; That this Temperature Humidity Sensor adopts is SHT11, the internal frame diagram of SHT11 such as Fig. 5 and with the interface circuit of CC2530 microprocessor as shown in Figure 6, comprise temperature pick up, humidity sensor, calibrating sensors, amplifier in the SHT11 and have the CRF generator of digital two-wire interface; This temperature pick up, humidity sensor, calibrating sensors output all are connected with inputs such as amplifiers, the output of described amplifier is connected with the CRF generator again, also connect digital two-wire interface on the CRF generator, promptly SCK, DATA send interface.The interior CC2530 microprocessor of main frame (UC) is connected with the interface of SHT11, comes transmission information, SHT11 operating voltage 2.4-5.5V.The SHT11 that present embodiment adopts is small and exquisite as numeral output, low-power consumption, volume that Temperature Humidity Sensor has absolute calibration, do not need characteristics such as external devices, long-term stability, is very suitable for using under coal mine.
4, gas concentration sensor; Gas concentration sensor adopts the mining catalytic combustion method gas sensor MC3.0L of explosion-proof type.As shown in Figure 7, MC3.0L type catalysis element is according to the principle work of catalytic combustion effect, be composed of two arms of electric bridge by detecting element and compensating element,, detecting element resistance raises when meeting imflammable gas, the bridge circuit output voltage changes, this voltage quantities increases and increase in direct ratio with gas concentration, and compensating element, plays reference and temperature and humidity compensation effect.
MC3.0L has explosion-proof, reliable and stable, characteristics such as output voltage signal is directly proportional with gas density, response recovery fast, the interference of temperature resistance humidity as the fire damp concentration sensor.Its investigative range is 0～4%VOL, and sensitivity is 20～40mV/1%, response time≤10s, recovery time≤30s, operating voltage 3V ± 0.1V, operating current 110 ± 10mA, power≤360mW, but be equal operate as normal under-40 ℃～70 ℃, the condition of humidity≤95%RH in environment temperature.
Because the resistance of MC3.0L itself is very little, its change in resistance is very little when the gas density in the environment changes, and the variation of the output voltage of electric bridge is also very little like this, needs in actual applications this output voltage amplified just can measure afterwards.Here adopt precision instrument amplifier AD623AR to come the output signal of MC3.0L is amplified, multiplication factor can be adjusted between 1～1000 times accurately by a resistance, voltage signal after the amplification uses the high-precision adc of CC2530 microprocessor to be converted to digital quantity, and the relation according to gas density and voltage can calculate gas density then.
The operating voltage of MC3.0L is 3.0V ± 0.1V, and its accuracy requirement to supply voltage is higher, and therefore using a low pressure difference linearity voltage stabilizing chip LM1117 in design is its power supply, uses precision resistance to regulate its operating voltage.In addition because the operating current of MC3.0L is bigger, therefore other parts in this ZigBee node also use a slice power MOSFET to control the break-make of its power supply in the design, and having only when needing to measure gas density be just to its power supply.When the frequent degree of gas density measurement is hanged down, can effectively reduce total average power consumption of node.
5, power management module is used to provide the power supply of whole monitoring network system.
6, man-machine interface and warning device; Man-machine interface comprises button and display, is used for some running parameter of node is provided with, and the working condition and the ambient parameter of node are checked etc.
Warning device is used for when subsurface environment is caused danger situation, or node is when receiving safety monitoring system center, ground information releasing, and the relevant personnel of underground work are pointed out and alarm.
Above-mentioned PMU, Temperature Humidity Sensor, gas concentration sensor, warning device, man-machine interface and power amplification circuit all are connected by circuit with the ZigBee transceiver.
Based on above-mentioned, owing under the mine its special applied environment is arranged, such as the ambient influnence in the external world, more wide factors such as coverage have proposed very high requirement for the transfer of data of underground wireless network.Angle from wireless networking, design philosophy in conjunction with low-power consumption, advanced person's wireless network protocol is introduced into the safety of coal mines system, makes that the data transmission performance of safety of coal mines system and efficient are all improved greatly, and reduce the cost that system extension is brought.
Along with the extension in tunnel, this system can increase wireless network nodes in these zones in time, enlarges network size, and its purpose is exactly fundamentally to solve the deficiency that existing monitoring system exists.This system adopts up-to-date wireless sensor network technology, compares with traditional network, and it is a kind of data-centered ad hoc deployed wireless networks.Node in the network is intensive, enormous amount and be deployed in zone very widely; Network topology structure dynamic change, network have self-organizing and self-adjusting characteristic; Network node has characteristics such as cost is low, volume is little, low in energy consumption, safe and reliable.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the manual just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (6)
1. monitoring network system based on the ZigBee network node, it is characterized in that, comprise the various data of down-hole are collected, analyzed, and the ZigBee wireless sensor network and the CAN network that is connected ground safety monitoring system and down-hole ZigBee wireless sensor network of ambient parameter and personal information data under the ground safety monitoring system of the decision-making of judgement, the counter-measure of downhole safety situation and early warning information issue according to this, production wells; Described ground safety monitoring system passes through CAN network destined ZigBee wireless sensor network to the down-hole information releasing.
2. a kind of monitoring network system according to claim 1 based on the ZigBee network node, it is characterized in that, described ZigBee wireless sensor network comprises the portable mobile node of ambient parameter and personal information data under the production wells, receives the detection data that mobile node sends and the mine laneway fixed-node and the ZigBee-CAN gateway that is connected the ground safety monitoring system by the CAN network of self-collected data; Described mine laneway fixed-node transmits the ZigBee-CAN gateway with data and the self-collected data that mobile node sends by ZigBee, and described ZigBee transmits the ZigBee-CAN gateway these data are arrived the ground safety monitoring system by wired CAN forwarded.
3. a kind of monitoring network system according to claim 2 based on the ZigBee network node, it is characterized in that, described mine laneway fixed-node is the ZigBee network router, described portable mobile node is the ZigBee network node, and described ZigBee network node comprises ZigBee transceiver, PMU, Temperature Humidity Sensor, gas concentration sensor, warning device and power amplification circuit; Described PMU, Temperature Humidity Sensor, gas concentration sensor, warning device and power amplification circuit all are connected by circuit with the ZigBee transceiver.
4. a kind of monitoring network system according to claim 3 based on the ZigBee network node, it is characterized in that, described ZigBee transceiver also is connected with some running parameter that is used for node and is provided with, the man-machine interface that the working condition and the ambient parameter of node are checked.
5. a kind of monitoring network system according to claim 4 based on the ZigBee network node, it is characterized in that described man-machine interface comprises and is used for button that some running parameter to node is provided with and the display that the working condition and the ambient parameter of node are checked.
6. according to claim 3,4 or 5 described a kind of monitoring network systems, it is characterized in that what described ZigBee transceiver adopted is the CC2530 microprocessor based on the ZigBee network node.
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| CN104155962A (en) * | 2014-08-28 | 2014-11-19 | 蒋和平 | Underground coal mine environment information monitoring system based on Internet of Things |
| CN104615103A (en) * | 2014-12-19 | 2015-05-13 | 上海电机学院 | Motor control system and method using ZigBee and CAN bus |
| CN108506043A (en) * | 2018-04-08 | 2018-09-07 | 安徽宏昌机电装备制造有限公司 | A kind of downhole intelligent InterWorking Equipment monitoring system and its personnel positioning method based on NB-IOT honeycomb technology of Internet of things |
| CN108979718A (en) * | 2018-06-20 | 2018-12-11 | 昆明理工大学 | A kind of wireless gas monitoring system and method based on ZigBee |
| CN109209500A (en) * | 2018-10-16 | 2019-01-15 | 深圳美特优科技有限公司 | A kind of coal mine down-hole fire monitoring |
| CN109756969A (en) * | 2019-01-18 | 2019-05-14 | 西安交通大学医学院第一附属医院 | The system and method for visual device dynamic management is realized with ZigBee technology |
| CN109899114A (en) * | 2019-03-25 | 2019-06-18 | 淮阴师范学院 | A kind of coal mine ZigBee node and ventilation equipment |
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