The functional characteristics and realization of coal mine safety monitoring and information management system

Industry Overview

Coal is an important energy resource in our country. Because of the special environment of coal mining, accidents are prone to occur. The coal industry is also known as a high-risk industry. Some early video surveillance systems used in coal mines were all analog surveillance, with poor scalability and stability and inconvenient management. Now with the development of network technology and computer technology, the application of IP network based on TCP/IP protocol has been widely popularized, and the advantages of wireless monitoring system here can be more reflected. At present, underground coal mine operations are far from the ground, the terrain is complex, and the environment is harsh. Accidents such as gas explosions and underground water seepage often occur. Using the remote video monitoring system, the ground monitoring staff on duty can directly monitor the conditions of the underground working face in real time, not only can intuitively monitor and record the safety production conditions of the underground work site, but also quickly deal with the hidden dangers to avoid possible occurrences. Accidents can also provide relevant first-hand image data for subsequent analysis of the accident. Therefore, the wireless remote video monitoring system is an important part of the modern mine safety production monitoring system.

The characteristics of coal mine safety production monitoring and control and information management system

The wireless network system for coal mine safety production monitoring and information management includes: underground image acquisition system, wireless transmission system, ground monitoring management command system.

Many coal mine system projects are installed in harsh outdoor environments, and the number of sub-mining points is large and scattered. Therefore, it is necessary to choose all-outdoor, easy-to-install, easy-to-maintain, and good-network-management wireless equipment to reduce construction and maintenance costs to meet the needs of sub-mining and mining. Real-time information transmission by the Ministry of Finance.

Coal mines are generally multi-point branches, so you need to choose wireless products that support point-to-multipoint networking to save system costs.

The coal mine attaches great importance to underground safety production monitoring and monitoring, so the link for the video, data and voice of the underground network to be transmitted back to the command center is very high, and it cannot be interrupted or mistransmitted. This requires high stability and reliability of the transmission link, and wireless transmission equipment must ensure long-term stable operation.

Underground image acquisition systems often use optical cables for video transmission due to environmental factors in underground tunnels in coal mines, because the use of optical signal transmission eliminates the electrical signals generated by traditional video cable transmission in the past, reduces hidden dangers, and the optical fiber transmission distance is very long. Up to 30km. The underground environment of the coal mine is harsh, so the requirements for video acquisition equipment are high: first, there is no light in the tunnel in the coal mine, and infrared spotlights cannot be used, and low-illumination cameras are required; second, there are only two voltages of 660V and 127V in the tunnel, which require Consider power conversion; thirdly, the underground air has a high content of gas and dust, which is prone to explosion, so it is necessary to use an explosion-proof protective cover that has been certified by Coal Safety.

The underground system not only installs cameras to monitor images, but also needs to place various sensors in different locations to monitor local water level, gas content, temperature, oxygen content and other data. The sensors are all RS-232 or RS-485 ports, and the bridge only provides RJ45 ports, so a port converter is needed to convert RS-232/RS485 ports to RJ-45 ports, that is, to convert analog signals into digital signals. Used for bridge transmission. During on-site installation and commissioning, all sensors, alarm linkage devices and video encoders must be correctly connected to the 485 line, the control protocol of the PTZ encoder, keyboard or software must be kept the same, and the front-end and back-end baud rate settings must be consistent And the setting of 485 address code.

The images and sensor signals collected underground are transmitted back to the ground monitoring management command center through the wireless network bridge erected in the monitoring substation on the well. At the same time, the monitoring sub-station can use a hard disk video recorder to store images locally; the monitoring center can use matrix switching for video monitoring, or input to the screen splitter to use a large-screen plasma TV to monitor.

In addition to video surveillance services, scenic spots also need one-way voice transmission to facilitate the monitoring center to broadcast various information to the surveillance spots. Therefore, a video codec that supports voice should be used.

Networking mode

SCI and SFI series provide high current and signal use. Advantages: High resonance frequency (High SRF), ultra-small inductance (Small), can provide higher quality factor (High Q), high current (High Current), can be used for automatic assembly, excellent resistance to mechanical vibration and resistance Extrusion and low error value.

Main production sizes: SCI/SFI-0603, SCI/SFI-0805, SCI/SFI-1008

Widely used in mobile phones (CDMA/GSM/PHS), wireless phones (DECT/CT1CT2), remote control devices, security systems, wireless automatic control, TCWLL, wireless local area network/mouse/keyboard/headset, VCO, RF modules and Wireless products, base stations, GPS receivers, CATV filters, tuners, set-top boxes, USB2.0, IEEE 1394.