In recent years, domestic mine accidents have occurred from time to time. How to strengthen safety production and safety supervision work, how to improve the efficiency of rescue and search and rescue work after an accident has become a hot issue of social concern. Combining with the actual needs of the coal industry, the intelligent IC card is designed to combine the cutting-edge remote radio frequency identification technology, network communication technology and automatic control technology to solve the safe operation of coal mine underground equipment, network data communication, and long-distance transmission of data. The technical problems in signal conversion and information processing provide effective scientific and technological support for the efficient operation of coal mine underground personnel monitoring, control and tracking management, rescue and disaster relief, safety rescue, production statistics and management, and effectively promote coal mining enterprises. The development has achieved comprehensive monitoring of coal mine safety production and truly meets the requirements of digital mines.
1 device configuration
The communication between the non-contact smart IC card and the reader is carried out by means of "space medium" electromagnetic waves. There is no mechanical movement mechanism and electrical contacts, and the operation is convenient and fast, the reliability is high, the service life is long, and the anti-interference is strong.
The contactless smart Ic card consists of two parts: the RF interface circuit and the digital circuit.
(1) RF RF interface circuit
In the RF radio frequency interface circuit, a waveform conversion module is mainly included. It can receive the l3.56 MHz radio modulation frequency on the card reader, send the modulation and demodulation module on the one hand, and convert the waveform on the other hand, convert the sine wave into a square wave, and then rectify and filter it. The regulating module further processes the voltage, including voltage regulation, etc., and finally outputs the circuits to the cards.
The POR module mainly performs POWER-ON-RESET (power-on reset) on each circuit on the card, so that each circuit starts synchronously.
(2) Digital circuit
The equivalent circuit on the card is shown in Figure 1.
La. Contact point of antenna coil and IC microchip Lb. Contact point between antenna coil and IC microchip Figure 1 equivalent circuit
Free oscillation frequency of the card 
Antenna coil inductance 
2 Downhole positioning system design principles
(1) To realize the effective identification, monitoring and monitoring of the entry and exit of underground coal mine workers, so that the management system fully reflects the “humanization, informationization and high automation†and achieve the goal of digital mines.
(2) Provide coal mine management personnel with management information on personnel access restrictions, attendance operations and monitoring and control. Once a coal mine safety accident occurs, the system can immediately know the number of workers and their number to ensure rescue and disaster relief. Efficient operation of ambulance and other search and rescue work.
(3) System design security, scalability, ease of maintenance and ease of operation.
3 Downhole positioning function design
3.1 Automatic data collection
Mine targets include people, vehicles, and some mobile equipment. Along the roadway, a sub-station is arranged at a certain distance. In addition, monitoring substations can be installed at the entrances and exits of the mine roadways, intersections, working faces, important diverticulums, dangerous places (such as blind alleys), and main entrances and exits of the ground. . When the person, vehicle or equipment carrying the RF card enters the detection range of the monitoring substation, the monitoring substation can read and transmit the information of the relevant personnel, the vehicle number and the equipment number to the control center. The data collection method is shown in Figure 2.
Figure 2 automatic data acquisition
3.2 Real-time location tracking
A non-contact smart Ic card can be equipped with a high-brightness alarm light for real-time positioning and tracking. When the card receives the call signal from the substation, the alarm light flashes to inform the relevant personnel. The personnel radio paging system will play an important role in the need for emergency evacuation and the search for missing persons. You can call a person, group call, call a person in an area, multiple zones, or a full mine call. Call information is controlled by the computer and sent through the designated monitoring substation. The call information has various types such as general call, emergency call, emergency evacuation call, etc., and is distinguished by different colors of the alarm lights.
3.3 Integrated Information Management
Through the records and statistics of the man's wells, the upwelling time, and the working hours in the underground areas, the basic information of attendance management is provided for the enterprise. Track the movement trajectory of safety monitors in the well and record the dwell time of each area and each monitoring point to ensure the implementation of safety monitoring.
When an emergency occurs in the mine, the lost personnel can be counted in time, the location information of the personnel and related personnel near the accident site can be inquired, and the accurate location of the personnel can be quickly determined, so that the search and rescue work can be carried out in a timely and effective manner. In the event of an emergency, an emergency warning signal is used to call the relevant personnel to evacuate the dangerous area, providing the commander with real-time distribution information of the personnel in the underground areas, and helping the commander to formulate a contingency plan. When the communication cannot be recovered, the missing identification person is searched downhole using the handheld identification device.
The computer network can realize the data sharing of the mine target positioning safety management information, and provide real-time monitoring information and historical information for the leaders of all departments and the lower and upper levels in the mine, providing an important basis for command and decision.
4 Conclusion
The system has been successfully applied to Fuxin Mining Group, providing effective technical support for underground mine personnel monitoring, control and tracking management, emergency rescue and rescue, and efficient operation of safety and rescue. It can also be applied to urban public transportation, e-passport, campus card. etc.
About the author: Chen Xiaoji (1983), Changtu, Liaoning, graduate student, mainly engaged in network and information system research.
Liaoning University of Engineering and Technology Ye Jinglou Liaoning Institute of Technology Chen Xiaoji Ren Yongchang Ye Jinglou Wang Liyan Yao Yuan
references:
[1] Lu Yongning. Non-contact Ic card principle and application [M]. Beijing: Publishing House of Electronics Industry, 2OO6.
[2] Standard System For Radio Frequency Identification (RFID) front Techni — callS]. S~ ARD&RFID. 2005: 8~12
[3]Integration S~ /IEC14443—3. Identification Card—C0玎cd cdess integrated circuit[S]. Aard$-Proximity cards—pan2.
[4] ISO/IEC15693-1, IdentificationCard—Contacfleas integrated circuit [S]. cards—Vicinity PAtl~$a part1:physical characteristics.
[5] Wang Aiying. Introduction to Ic card technology - electronic money and electronic documents [M]. Beijing: Tsinghua University Press, 1998.
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