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1. Analysis of the status quo of coal safety monitoring system
In my country’s coal industry, most companies have already built or are building coal safety monitoring systems. The establishment of these systems has played an important role in the realization of safe production; however, because various systems were built in different periods and used different Technology, the various systems cannot be effectively integrated, so that the safety production monitoring and monitoring information cannot be well integrated and utilized. The timely and accurate transmission of safety production monitoring and monitoring information to relevant personnel at all levels lacks effective means.
1. The importance of coal mine safety supervision
In coal enterprises, safety in production is the first major issue before leaders at all levels, and it is the top priority in the production process of coal enterprises. Domestic coal production accidents continue, especially the continuous occurrence of major gas explosion accidents that have caused serious losses. A series of tasks such as discovering hidden dangers of major accidents in time and avoiding the expansion of catastrophic accidents make coal mine safety supervision work particularly important. Making full use of the current advanced communication network and information technology, combined with practical applications, is an effective means to improve safety production supervision, supervision and management.
2. Analysis of the status quo of coal mine safety monitoring system
* The equipment of the safety monitoring system can realize the comprehensive monitoring of environmental parameters such as gas, wind speed, carbon monoxide and other equipment and facilities such as fans.
* There are few safety production supervisors, and there are many small coal mines in towns and towns. The gas status of the mines cannot be inspected. It is difficult for the safety production supervision and management department to know the production mine situation in time and monitor the coal production environment in real time.
*Some small coal mines install safety monitoring and monitoring systems and do not use them; or in order not to affect production, they use methods such as holding the power-off switch and wrapping the gas detectors in plastic cloth, so that the mine gas monitoring system does not work, causing potential safety hazards happens sometimes.
* Some managers who monitor gas leave their duties without authorization and do not report when gas exceeds the limit. Coal mine gas over-limit production is more serious and accidents occur frequently.
* The implementation of “one ventilation, three prevention” (ventilation, fire prevention, dust prevention, gas prevention) safety facilities is an important means to ensure safe production. The implementation of remote supervision and management of “one ventilation and three prevention” safety measures is the top priority of our country’s current coal mine safety production supervision and management.
3. The design idea of coal mine safety early warning and supervision system-remote real-time monitoring of mine safety in the network of bureaus and mines
* Based on the current difficulty of production safety supervision departments to understand the safety situation of coal production in real time, develop and research, and realize the safety information interconnection between coal mines in various regions.
*Realize remote real-time monitoring of coal mine safety status.
*Can remotely monitor the mine gas, carbon monoxide and other environmental parameters and fan conditions.
* Use GPRS/CDMA1X communication method to realize remote real-time transmission of secure data.
* The large-scale database developed for coal mine safety has complete functions, which can realize real-time data query, historical data query and safety situation analysis.
* After the gas exceeds the limit, the alarm can be automatically alarmed by mobile phone text message (SMS), and the alarm information can be sent to the mobile phone of the relevant personnel.
2. Introduction to GPRS and CDMA1x wireless networks
Currently, wireless data transmission services based on GPRS/CDMA are widely used in mobile office, industrial control, remote telemetry and other aspects. Network operators China Mobile GPRS and China Unicom CDMA each have their own characteristics.
GPRS (General Packet Radio Service, General Packet Radio Service), as a transition technology from the second-generation mobile communication technology GSM to the third-generation mobile communication (3G), is a GSM-based mobile packet data service that provides users with mobile packet data services. IP or X.25 connection.
GPRS is a new network superimposed on the existing GSM network. At the same time, some hardware devices are added to the network equipment, and the original software is upgraded to form a new network logical entity. GPRS can provide users with end-to-end, wide-area wireless IP connections. In layman’s terms, GPRS is a wireless high-speed data transmission technology. It is based on packet switching technology. Through GPRS, users can use various high-speed data services on the move, including sending and receiving E-mail, Internet browsing, instant chat, etc. . At present, China Mobile’s GPRS network has covered all provinces, municipalities and autonomous regions nationwide, and the network covers more than 240 cities.
CDMA is the English abbreviation of Code Division Multiple Access (Code Division Multiple Access). It is a new wireless communication technology developed on the branch of digital technology? Spread spectrum communication technology. The principle of CDMA technology is based on spread spectrum technology. The information data that needs to be transmitted with a certain signal bandwidth is modulated with a high-speed pseudo-random code whose bandwidth is much larger than the signal bandwidth, so that the bandwidth of the original data signal is expanded, and then modulated by the carrier. Send it out. The receiving end uses exactly the same pseudo-random code, and performs related processing with the received bandwidth signal, and replaces the wideband signal with the narrowband signal of the original information data, that is, despreading, so as to realize data transmission.
CDMA is based on spread spectrum technology and occupies the brand new 800M frequency band (GSM occupies the 900M frequency band), so it cannot be directly upgraded on the original GSM equipment. At present, China Unicom has optimized and upgraded the CDMA network through the construction of the second phase of the project. The network has been upgraded from IS95 to CDMA1x. At the same time, it has built a wireless data network covering 31 provinces (autonomous regions and municipalities) across the country.
3. Introduction to Coal Mine Safety Monitoring System
System components
The coal mine safety monitoring system of the wireless network is mainly composed of three parts: the ground monitoring center, the wireless data transmission network platform, and the coal monitoring management center system.
Ground monitoring center: consists of monitoring host, transmission interface, uninterrupted power supply, wireless router, color printer, monitoring software, substation, wind speed sensor, temperature sensor, carbon monoxide sensor, equipment start-stop sensor, smoke sensor, gas sensor, remote switch And other composition.
Wireless data transmission network platform: the current domestic wireless public network, such as GPRS, CDMA 1x network platform.
Coal monitoring and management center system: network communication server, real-time database server and user control operation interface, etc.
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