In the event of a sudden disaster in a mine, time is life. Command and dispatch personnel may not be able to notify on-site personnel in a short period of time through telephone or wireless mobile phones due to the blockage of the telephone communication system. Delays may be caused by on-site personnel being unable to communicate or not answering calls in a timely manner, or serious errors may be caused by communication errors. Due to the limited scope and slow speed of information dissemination, the favorable opportunity for risk avoidance has been lost.

 

According to the notice from the State Administration of Work Safety and the State Administration of Coal Mine Safety on the construction and improvement of the "six major systems" for underground safety avoidance in coal mines, coal mining enterprises should actively promote the use of underground emergency broadcasting and communication systems. When a dangerous situation occurs, it is necessary to promptly notify underground personnel to evacuate. The emergency broadcasting and communication system plays an important role in the daily production and life of mines. Under normal circumstances, broadcasting signals release news, internal information, daily routine signals, provide background music, as well as paging and forcibly inserting emergency broadcasts of catastrophic accidents through the mine information network. It is an indispensable component of mine safety production.

 

To ensure that coal mining enterprises can notify underground workers in the fastest and simplest way when encountering emergencies, take corresponding safety measures, and guide relevant personnel to evacuate urgently, achieving timely and effective emergency rescue. Our company has developed a digital, IP based, SIP based, video based, and intelligent emergency rescue command system for coal mines, taking into account the current situation and development direction of coal mine emergency broadcasting communication systems and video surveillance. We use technologies such as digital, microcontroller encoding and decoding, and embedded software. This system integrates safety broadcasting, video monitoring, dispatch and command, safety monitoring, and public voice. It is a new generation of digital voice system and has been recognized by many mining industries.

 

At present, the expansion terminals in the mining industry are generally dominated by analog telephone or network broadcasting, achieving on-site expansion and broadcasting. The new generation of mine emergency broadcasting system can achieve remote video monitoring, visual communication, and broadcasting functions underground, and is currently an alternative product to the mine emergency broadcasting communication system.

 

The mining broadcasting system not only has the integration communication of remote broadcasting, remote video monitoring, expanded telephone access, emergency calling, visual intercom, wired telephone, wireless telephone and other systems, but also has the advantages of long transmission distance, large installation range, good anti-interference, strong control function, etc. It can be integrated with coal mine safety monitoring system, mining industry environmental monitoring system, precise location system, video monitoring system, etc.

 

 

The collection, transmission, and storage of audio signals in early mining emergency broadcasting communication systems were all analog, using constant voltage broadcasting for transmission and responding to all calls. However, since digital emergency broadcasting systems have not yet emerged, data transmission and regional broadcasting cannot be carried out through the network. The constant pressure emergency broadcasting communication system has good real-time performance, but it has disadvantages such as occupying a lot of line resources, easy distortion of audio signals during transmission, and small communication range.

 

The proposal of "digital mines" has gradually applied digital voice communication to coal mine safety production. Currently, the mine emergency broadcasting communication system is in the stage of mixed application of analog and digital. Digital broadcasting has the advantages of pure sound quality, strong anti-interference ability, large coverage area, and complete functions. Its application prospects are broader than those of constant pressure broadcasting. More and more mining enterprises are starting to use digital voice communication technology to replace analog voice communication technology. Especially with the rise of VOIP technology, it has driven the industrial revolution of IP digitization. The visual emergency broadcasting communication system based on VOIP digitization can be integrated into the mine production scheduling system. Therefore, the digital emergency broadcasting communication system is an inevitable trend in building "digital mines".

 

 

The mine emergency broadcasting system consists of a system server, a paging phone, a touch screen dispatch console, a network transmission part, a mining intrinsic safety expansion terminal, a mining visual expansion terminal, a mining power supply, etc. The network transmission structure can be divided into tree network structure and Ethernet based transmission structure. The difference between a tree network structure and an Ethernet based transmission structure is that the former has a network structure similar to a hand in hand structure, where any damage to a point can affect the subsequent terminal transmission. The structure based on industrial ring network transmission does not have the drawbacks of the former, and can also save construction costs.

 

The system server or pager implements broadcasting, calling, calling, conference, and management of underground broadcast terminals through the network. The underground broadcasting terminal can call the dispatch room, which can be linked with nearby video surveillance cameras or calls initiated by visual broadcasting speakers to achieve visual communication with underground calling personnel. In emergency situations, dispatch and command personnel can forcibly open visual broadcast terminals with visual functions for video monitoring, improving the dispatch and command capabilities.

 

Underground broadcasting speakers are divided into intrinsically safe broadcasting speakers for mining and visual broadcasting speakers for mining. Both have functions such as hands-free, handle off hook communication, calling, answering, dialing, emergency calling, broadcasting, etc. The difference is that mining visual broadcasting speakers have bidirectional visual communication function, which can achieve high-definition bidirectional video intercom. Underground and ground command centers can achieve bidirectional video communication. In case of emergency in the mine, dispatch and command personnel can achieve remote video monitoring and video calls through visual broadcast speakers, achieving the purpose of visual dispatch.

 

The mining emergency broadcasting system is not only the emergency command system of the mine, but also the backup communication system of the mine. The system supports video linkage, network registration, conference, scheduling, integration with mine safety monitoring system, environmental monitoring system, personnel positioning system, etc. It can also be integrated and interconnected with the production scheduling system and wireless communication system of the mine.

 

4.Main functions