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1. System overview
The new guide ZigBee tunnel safety comprehensive monitoring system adopts the most advanced Zigbee wireless identification technology, and is designed in combination with the technical requirements and safety standards of highway tunnels, railway tunnels, and subway tunnels. The accuracy of personnel positioning is up to 3 meters. The system uses the same communication network to realize the functions of four sub-systems: tunnel personnel positioning, mobile phone wireless communication, LED synchronization control, and video monitoring (expandable wireless gas monitoring). The unique multi-network integration system not only meets the functional requirements of various aspects of tunnel construction, but also has significant advantages of “low cost and high efficiency”.
The relevant equipment of the Xindao ZigBee Tunnel Safety Comprehensive Monitoring System is intrinsically safe and has passed the national mining product safety certification, which ensures the reliability of the system.
2. System design principle
First, place a certain number of intrinsically safe base stations/card readers according to the actual needs of the enterprise and the specific conditions of the tunnel area. Typically, a base station is placed near the entrance of the tunnel and near the anchoring and shotcreting support area to ensure wireless communication within the network coverage; a card reader is placed near the tunnel entrance and a card reader is placed in the tunnel to achieve accurate attendance manage.
Wear a KJ272-K intrinsically safe positioning card for the person who needs to be positioned. When the person enters the tunnel, as long as the person is within the tunnel network coverage, at any point at any time, the base station can sense the signal and upload it to the information workstation. Software processing to obtain specific information (such as: who, where, specific time), and it can be dynamically displayed (real-time) on the computer in the monitoring center or on the large LED screen outside the tunnel, and make a backup . Supervisors can know the status of people in the tunnel at any time.
The manager can also view a certain area according to the distribution diagram on the computer, and the computer will count and display the personnel in this area. The manager can observe the real-time regional location of the staff in the tunnel in real time, and realize the localization of the staff in the tunnel. In addition, once an accident occurs in the tunnel, the personnel at the accident site can be found immediately based on the personnel location distribution information in the computer, so as to help rescuers rescue the trapped people in an accurate and rapid manner.
Once an emergency occurs in the tunnel, the people in the tunnel can send out an alarm through the positioning card they carry. People in the tunnel can send out an alarm by pressing the alarm button on the positioning card. The dynamic display interface in the monitoring room will immediately pop up a red alarm signal.
And then prepare an intrinsically safe mobile phone for the personnel in need (such as the leader on duty, the team leader, etc.). When the personnel enter the tunnel, as long as they are within the coverage of the tunnel network, they can easily realize the tunnel wireless mobile phone call function.
3. System structure diagram
4. Main functions of the system
4.1 Personnel positioning system
The personnel positioning system is mainly used to track and monitor the personnel in the tunnel to achieve personnel positioning. The personnel in the tunnel carry the positioning card, and the system can obtain the location information and grasp the number and distribution of the personnel in the tunnel in real time.
4.2 Wireless communication system
The wireless communication system solves the problem of mobile calls inside and outside the tunnel. Tunnel personnel can communicate with each other by using mobile phones or sending text messages. It can also make mutual calls with fixed telephones inside and outside the tunnel and receive SMS or telephone notifications from the monitoring center.
4.3 LED synchronization control system
The LED synchronization control system retrieves the real-time monitored personnel information data from the monitoring host, and displays it on the large LED screen synchronously. The displayed content includes: name, type of work, department, and time to enter the tunnel, making management advanced and transparent.
Features: LED large screen outdoor full waterproof design, IP65 rating; real-time simultaneous display of attendance information; multiple display methods to meet the needs of tunnel attendance, publicity, on-site meeting welcome slogans, warm reminders, etc.
4.4 Video surveillance system
The video monitoring system uses high-definition digital cameras to record key scenes in the tunnel, intuitively and real-time monitoring of key production links such as the tunnel face.
Features: optical fiber transmission, long distance, strong anti-interference ability; small amount of data, long storage time; integrated image real-time display, pan-tilt encoding control, storage, playback, character overlay, matrix switching, authority management, and network communication. Powerful and easy to operate; the screen can display 1/4/9/16 camera images at the same time, and can perform image freezing, zooming and other operations; hard disk recording methods: continuous recording, dynamic recording, manual recording, and alarm recording.
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