GPRS remote safety monitoring system for coal mine
· I. Background introduction
· Coal mine gas accident is the main source of accidents with high frequency and great harm. Monitoring the state of coal mine gas is the key to solve the hidden danger of coal mine gas and realize the safe production of coal mine. The coal mine safety monitoring system is an important technical means to improve the coal mine safety level and realize the real-time monitoring and monitoring of the coal mine safety production status by the coal industry management department and the coal mine safety production supervision department.
· The coal mine is located in a remote location and has complex terrain. The construction of wired communication network requires large investment, difficult network wiring and high maintenance cost. However, the use of microwave, digital radio and other ways, poor network coverage, short distance, large user input, difficult maintenance. Using GPRS as the data transmission mode, not only can meet the communication requirements of the system, but also the data transmission is more secure, and the users input is lower.
· When GPRS DTU is adopted as the data transmission carrier, the user terminal (gas sensor) can notify the relevant management personnel of the alarm information through SMS when the environmental parameters exceed the threshold, so as to take timely measures to eliminate hidden dangers.
· GPRS DTU features
· GPRS DTU is a wireless data transmission terminal with high reliability processor and GPRS/SMS transparency. Data transmission based on GPRS network has a wide range of communication, transmission stability, reliability and other characteristics, GPRS DTU is designed for industrial integration design, in the use of temperature range, vibration, electromagnetic compatibility and interface diversity and other aspects of the use of special design, to ensure the stability of the work under harsh environment, It is widely used in unattended, remote equipment monitoring, remote data collection, remote meter reading and remote scheduling. Considering the needs of user networking, support virtual data private network. Suitable for the center to multi-point, multi-point scattered small and medium-sized data transmission.
· Standard industrial products, EMC anti-interference design, strong ability to adapt to the environment;
· Industrial grade high performance embedded processor
· Working frequency: EGSM900/GSM1800MHz dual-frequency, optional GSM800/900/1800/1900mhz quad-frequency: GSM Phase 2/2+ GPRS Multi-slot Class 10 Optional Class 12
· Perfect protocol stack: the system loads the perfect TCP/IP protocol stack, which makes the network communication performance excellent and the probability of disconnection greatly reduced
· Support a variety of automatic networking: can be converted to serial port - network (easy to use GPRS under the condition of no Internet), can achieve one-to-one, one-to-many networking;
· Plug and play function: large SCADA system can be built without any software and hardware development;
· IP automatic registration mechanism, which can realize a variety of service modes and build a complete super-scale wireless application system;
· Remote sleep and wake up: DTU can be hibernated and woken up by dialing the DTU number on a mobile phone with a specified number, which is convenient for users to sleep DTU when DTU is not in use and greatly saves traffic charges;
· Remote MODIFICATION of DTU parameters: support modification of DTU parameters by SMS and network;
· IO switching function: with two switching inputs and two switching outputs. You can control the switch input or query the status of the switch input through GPRS network or SMS. The alarm can be opened remotely and the input alarm mode can be set: GPRS alarm and SMS alarm, and the alarm state threshold can be set (low level alarm or high level alarm), in addition, the user can also define the alarm information content;
· Powerful communication standby function: If the standby service function is enabled, the connection between the primary server and the standby server can be switched automatically. Once the primary server has problems, it will be automatically connected to the standby server.
· Powerful server software support, server software has been used for many years, powerful, mature and perfect;
· Support fixed IP and dynamic domain name resolution, support dedicated APN;
· Supports the synchronization function of up to 4 servers. If the GPRS server synchronization function is enabled, 4 servers can be registered and communicated with at the same time;
· Support up to 20 SMS control numbers;
· Industrial temperature range: operating temperature: -40℃-80℃, communication is not affected at -40℃.
· III. System structure
,
· (Figure) Schematic diagram of coal mine safety monitoring system
· The coal mine safety monitoring system requires that all kinds of data collected underground can be safely, timely and effectively transmitted and summarized to the ground monitoring center, transmitted to the network center through GPRS wireless network, and then transmitted to the local coal monitoring center and superior safety supervision department through special line or Internet.
· Coal mine safety monitoring system is mainly divided into three parts: data acquisition terminal, wireless data transmission network platform and coal monitoring and management center system.
1, data acquisition terminal: uninterrupted power supply, GPRS DTU, sensors (gas, temperature and humidity and other sensors) and other components.
2. Wireless data transmission network platform: GSM network, Internet (VPN), server.
3. Coal monitoring and management Center system: Internet (VPN), user control software.
