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I. Overview
1. Background of coal mine personnel positioning system
my country is the world’s largest coal consumer and producer. With the rapid growth of the national economy, the demand for coal continues to rise. In the past two years, coal supply has been tight, followed by the overloaded operation of various coal mines. The rapid development of production highlights the backwardness of the technical level of hidden danger control and monitoring in all aspects of coal mine safety production, and the corresponding levels of production Security accidents also occur continuously. Due to the continuous rise of coal prices, accidents caused by over-mining also occur. How to monitor the activities of mine personnel, the daily transportation volume of coal carts, gas, wind speed, fire, water penetration and other data in real time. After the accident, How to accurately determine the location of the mine personnel, especially the trapped location of the mine personnel, the evacuation route of the personnel in distress, the environmental monitoring of the underground, and the timely and accurate formulation of rescue plans. This is not only for the rescue of the accident but also for the prevention and control in advance. Very urgent problem to be solved.
How to strengthen preventive measures for safe production, how to correctly handle the relationship between safety and production, safety and benefit, and how to accurately, real-time and quickly perform coal mine safety monitoring functions to ensure the efficient operation of emergency rescue and safety rescue has been placed in the national authorities at all levels. And in front of the leader. At the same time, how to change the current management mode of coal mining enterprises’ positioning of mining personnel and backward assets, and how to realize management modernization and informatization have also become issues of concern to all coal mining enterprises. Therefore, it combines advanced technology and first-line coal mine safety production requirements to develop a safety monitoring system for coal mine assets and mine personnel positioning, and establish a complete set of coal mine personnel positioning with intelligent monitoring management, alarm, mine personnel positioning, tracking and other functions in real time The monitoring system and the mine personnel positioning system will greatly improve the safety and management efficiency of coal mine work, reduce safety hazards, and reduce the occurrence of safety accidents. At the same time, the mine personnel positioning system can also be effectively integrated with the existing system. Extend the functions in many aspects, improve the functions of the entire coal mine personnel positioning system, effectively enhance the safety of the system, and realize the positioning of mine personnel and underground personnel in the true sense. The mine personnel positioning system implements safety monitoring of mine personnel, which will bring new opportunities for the safety production and operation management of coal mine enterprises to rise to a higher level.
2. The feasibility of the application of the coal mine personnel positioning system
Real Time Locating System in English is ReaTime Locating System, or RTLS for short. RTLS mainly uses radio frequency, ultrasonic, infrared and other technologies to locate objects. The wireless local area network real-time positioning system (Wi-Fi RTLS) uses the standard IEEE 802.11 wireless local area network to achieve tracking and identification and GPS-like positioning functions in a local area of indoor or outdoor. The market for Wi-Fi RTLS systems is very broad, involving almost every field such as logistics, warehousing, retail, manufacturing, schools, hospitals, government, military, and transportation. At present, Wi-Fi RTLS technology is gradually being used in coal mines for real-time positioning and management of personnel and assets.
The Wi-Fi RTLS coal mine personnel positioning system combines Wi-Fi, RFID, wireless sensor network and other technologies to meet the safety production requirements of first-line coal mines, and realizes real-time positioning and supervision of coal mine personnel positioning based on electronic maps. The mining personnel positioning system does not need to re-build other networks or facilities, and can be quickly deployed and installed on the basis of the company’s original wireless local area network, providing coal mining enterprises with a complete set of assets and personnel tracking and positioning solutions. The main functions include: coal mine roadway electronic map browsing, regional population analysis, base station regional personnel report, map alarm, personnel positioning, personnel real-time track monitoring, personnel historical trajectory playback, personnel tunnel best path analysis and other functions, providing safe production in coal mines It provides timely and effective mining personnel positioning and monitoring functions, and provides the best path analysis for personnel escape, and improves the safety production capacity of coal mines by means of information technology.
At present, the coal mine personnel positioning system using WiFi RTLS technology has been well applied in some foreign coal mines. The mine personnel positioning system has greatly improved the safety environment of underground operations in coal mines and greatly reduced management costs.
The Wi-Fi RTLS coal mine personnel positioning system locates and wears one piece for each mine personnelPositioning label, After installing the coal mine personnel positioning system management software, the manager can see the area of each mine personnel positioning activity in front of the computer
1. The coal mine personnel positioning system can locate and track the position of the mine personnel in real time, which is convenient for displaying and querying personnel conditions, such as: how many people are in the underground at any time or in a certain place, and who are these people? Everyone is in the underground at any time Track of activities; query the actual location of one or more personnel, so that the dispatch center can quickly and correctly contact the personnel by telephone.
2. The coal mine personnel positioning system displays the real-time dynamic distribution of the mine personnel positioning in the tunnel at all times in real time, and makes corresponding dynamic maps according to the actual geography of the underground, so that the underground situation is vivid and vivid at a glance;
3. Once various accidents occur, the coal mine personnel positioning system can immediately find out how many people are in distress, where are the people in distress? Who are they? At the same time, the unique alarm function of the positioning tag can quickly alarm and display when an emergency occurs. Emergency location, to maximize the personal safety of mine personnel positioning.
2. Design Ideas for Supervision of Coal Mine Personnel Positioning System
1. Design basis for coal mine personnel positioning system
GA/T75 “Safety Protection Engineering Procedures and Requirements”
MT209-1990 “General Technical Requirements for Electrical and Electronic Products for Coal Mine Communication, Testing and Control”.
2. System design features
Highly automated. The system can automatically detect the time and location information of the underground tunnel workers passing the monitoring point, and automatically realize the statistics and management of attendance operations.
Advanced communication system. The identification system installed in each channel of the underground mine transmits the data passed by relevant personnel to the network server in real time, without human intervention in the whole process.
Complete data statistics and information query software. The system software has a dedicated database management system, including the information collection and statistical analysis system for workers passing through the tunnel, the statistical and management analysis system for attendance operations, display and print various statistical reports, and provide a full range of services for senior management inquiries and management .
The system is designed for safety, stability and reliability. The system product adopts the tunnel wall-mounted design, there is no need to carry out on-site construction in the tunnel, and ensures that the system operates continuously and normally for 24 hours in a harsh environment;
Complete alarm call system configuration for abnormal conditions (including invalid sensor and invalid sensor entry).
3. Design principles of coal mine personnel positioning system
· The coal mine personnel positioning system realizes the mine personnel positioning, especially the mine personnel positioning system. The mine personnel positioning system realizes the effective identification of the entry and exit of the mine personnel working on the working surface of the underground tunnel, so that the system management fully reflects the “humanization, informatization and Highly automated”
· The coal mine personnel positioning system provides senior management personnel with information inquiries on attendance and personnel entry and exit restrictions.
· Once a safety accident occurs, the coal mine personnel positioning system can immediately know the number of workers on the working surface of the tunnel, ensuring the efficient operation of emergency rescue and safety rescue work.
· After a safety accident occurs, the mobile identification device of the coal mine personnel positioning system can detect the presence of people within 10 meters of the accident site, which is convenient for the timely deployment of rescue work.
· The system design is safe, expandable, easy to maintain and easy to operate.
3. Features of the coal mine personnel positioning system
The coal mine personnel positioning system supervision solution is mainly based on the wireless local area network real-time positioning system (Wi-Fi RTLS). According to the actual positioning needs of the coal mine, the international advanced technology is adopted to solve the personnel monitoring and positioning problems inside the mine through the Wi-Fi network. Under various resources for effective control and tracking. The coal mine personnel positioning system can timely and accurately reflect the dynamics of personnel and equipment in various areas of the underground to the ground computer system, so that managers can grasp the position of the mine personnel, the distribution of equipment, and the location and movement trajectory of each miner at any time. To facilitate more reasonable scheduling and monitoring management. When an accident occurs, rescuers can also quickly understand the location of relevant personnel based on the data and graphics provided by the positioning system, and take corresponding rescue measures in time to improve the efficiency of emergency rescue work.
Features of coal mine personnel positioning system solution:
1) Coal mine personnel positioning system combined with Wi-Fi network, no need to re-build other networks or facilities, save a lot of network construction costs, and reduce users’ initial equipment investment;
2) The coal mine personnel positioning system provides real-time mining personnel positioning tracking, which can find the location of a person at any time, and the path passed in a certain period of time, and display the line trajectory;
3) The coal mine personnel positioning system has high positioning accuracy, 3~5 meters high accuracy positioning, and accurately grasps the location of objects or personnel;
4) The coal mine personnel positioning system adopts an ultra-low power label design, which can replace the battery label, and the life span can reach more than 5 years, and it is safe to the human body and has no radiation damage.
5) The design flexibility of the coal mine personnel positioning system is strong. The entire network system architecture adopts a modular structure, and a certain part of the fault can be replaced in time without affecting the operation of other components.
6) The visual terminal platform of the coal mine personnel positioning system displays the location and movement trajectory of personnel or objects in the form of an electronic map, as well as environmental and alarm information, which is convenient for environmental monitoring and safety precautions.
4. Scheme design of coal mine personnel positioning system
1. The composition of the coal mine personnel positioning system
The mine personnel positioning system is based on a wireless local area network design. The mine personnel positioning system consists of the following three parts: the mine personnel positioning and positioning tag (Wi-Fi Tag), the wireless LAN access point (Access Point), and the positioning server (Locating Server) .
The working principle of the system:
1) The positioning tag or the wireless device periodically sends out wireless signals.
2) After the access point receives the signal, it transmits the signal to the positioning server.
3) The location server of the coal mine personnel positioning system determines the location of the tag or wireless device according to the strength of the signal or the time difference of the signal arrival, and displays its specific location through an electronic map.
2. System topology
The coal mine personnel positioning system is based on a wireless local area network design. The coal mine personnel positioning system mainly includes three parts: a mine personnel positioning tag, a wireless local area network access point (AP) and a back-end monitoring and management center (positioning server):
1) Mining personnel positioning tags are worn on each worker as a wireless data collection module, and the system can track and locate personnel by tracking the tags.
2) The AP adopts the 802.11a/b/g mode supported by 2.4G, collects tag information in time, transmits it to the back-end monitoring center, and controls and manages the underground tag equipment. Each AP base station has an effective coverage of 100 meters underground, and the effective accuracy of the tag is 3-6 meters.
3) The monitoring management center installed with the positioning server software system mainly realizes real-time data analysis and processing. Analyze and manage tag data, monitor and display the location of each field tag in time through the electronic map of the control center, the data can be stored in the storage database at the same time, and the monitoring personnel can access the storage server through the computer to query the location of the personnel.
3. Main functions of coal mine personnel positioning system
(1) User management: Mining personnel positioning system facilitates user information entry and permission setting. Adopt the departmental delegation management form, establish a tree management system, and authenticate the user’s operation request. When the operation requested by the user has the corresponding operation authority, the user can perform the corresponding operation, and the operation is recorded in the operation log. When the operation requested by the user does not have the corresponding operation authority, the user cannot perform the corresponding operation.
(2) Label information maintenance: The mining personnel positioning system provides label-wearing personnel information management, including photos, department, attendance shift, work area, health status, etc.
(3) Personnel management: The mine personnel positioning system realizes personnel positioning, real-time display of working area, temperature sensor, and working status. Realize the reasonable dispatch of personnel.
(4) Monitoring area management: The mine personnel positioning system supports the editing of monitoring locations, maps and other information, including new creation, modification, and deletion.
(5) Performance Attendance: Mining personnel positioning system can automatically count down well time, up well time, generate statistical reports, and automatically summarize attendance data.
(6) Personnel trajectory monitoring: The mine personnel positioning system records the movement trajectory in real time, and can be used to notify the underground workers of the work route and safe escape route analysis when a situation occurs in the underground roadway of the coal mine.
(7) All-in-one card service: Mining personnel positioning system support and all-in-one card integration, which can be used by management personnel to use cash and purchase items in a unified manner.
(8) Query statistics: The mine personnel positioning system provides maintenance and query of related operation logs and alarm logs. The information of the entire network monitoring system is processed uniformly, including information setting, information recording, information forwarding and information query.
(9) System management: Mining personnel positioning system provides system maintenance, log query, data import, data export, data backup, and data upload.
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