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I. Introduction
In recent years, coal mine accidents have occurred continuously across the country. How to strengthen safe production and improve the efficiency of search and rescue work has been put in front of the competent authorities and leaders at all levels of the country. When we analyzed the major accidents that occurred in several recent mines, we found that: the information communication between the ground and underground personnel was not timely; it was difficult for ground personnel to dynamically grasp the distribution and operation of underground personnel in a timely manner to accurately locate personnel; once a mine accident occurs, rescue and disaster relief , The efficiency of safety rescue is low, and the effect of search and rescue is poor.
For this reason, how to correctly handle the relationship between safety and production, safety and benefit, how to accurately, real-time, and quickly perform mine safety monitoring functions, effectively manage miners, and ensure the efficient operation of emergency rescue and safety rescue is particularly important and urgent. How to change the current management mode of mining enterprises’ backward personnel and how to realize management modernization and informatization have become the concerns of all mine enterprises.
At present, with the development of computer technology, readers based on long-distance microwave radio frequency identification technology have begun to be applied, and it will be a trend to introduce underground personnel detection systems into mine safety detection systems. Laiwu Jiexun Electronics Co., Ltd. took the lead in adopting RFID (Radio Frequency Identification) technology in China and developed the KJX-RFID underground personnel detection system. The realization of this technological achievement will bring new opportunities for the safe production and management of mine enterprises. .
The KJX-RFID downhole personnel detection system developed by the company effectively realizes the actual detection and tracking of downhole personnel, prevents human errors and various dangerous situations, guarantees the accuracy of the original data collection, improves the management level, and reduces economic losses . Become an important part of enterprise information management. Through the development of software, this system adapts to the choice of different communication methods and the extended application in different fields. At the same time, an information helmet is creatively developed. This system has broader and broader advantages in applications and functions.
2. System composition and structure
The KJX-RFID underground personnel detection system consists of three parts:
Information helmet:
It is composed of a miner’s hat and a smart card. The smart card is composed of coupling elements and chips. Each smart card has a unique electronic code and is attached to the helmet to identify the target object; the smart card can store data and information about the personnel. In the automatic identification management system, each smart card saves a person’s information. Smart cards are usually installed on the surface of the helmet and have a certain angle of view without metal obstruction.
JX0502 Reader: A device that reads and writes smart card information. Its main functions are:
Check the data information currently stored in the smart card;
Write the data to be stored in the blank smart card;
Modify (rewrite) the data information in the smart card.
Antenna: Transmit radio frequency signals between the smart card and the reader.
3. Design principles of downhole personnel detection system
1) Realize the effective identification and monitoring of the entry and exit of underground operators, so that the management system fully reflects “humanization, information and high automation”, and realizes the goal of digital mines.
2) Provide mine management personnel with various management information such as personnel entry and exit restrictions, attendance operations, monitoring and monitoring. Once a mine safety accident occurs, the system can immediately know the personnel and their numbers on the operation surface to ensure emergency relief and safety rescue Wait for the efficient operation of search and rescue work.
3) The safety, scalability, easy maintenance and easy operation of the system design.
Fourth, the working principle of the system
When a helmet equipped with a smart card approaches the JX0502 reader within a distance of 0-10 meters, the reader will send out a microwave query signal under control. The smart card installed on the surface of the helmet will send this signal after receiving the query signal from the reader The data information in the smart card is integrated and reflected back to the smart card reading device. The reflected microwave synthesis signal already carries smart card data information. After the reader receives the microwave synthesis signal reflected by the smart card, it can separate and read the identification code and other information stored in the smart card after being processed by the internal microprocessor of the reader.
The working principle diagram of the system is as follows:
Five, performance indicators
KJX0502 reader performance indicators:
Main technical indicators of antenna:
Size: 29*26*12 cm Weight: 3KG
Frequency range: 902~928Mhz
Standing wave ratio: 1.3
Polarization method: vertical polarization
Gain: 9dBi
Cable interface: Block N
Beam: horizontal 65° vertical 68°
Six, system characteristics
1. It is small in size, easy to install, and uses passive RFID smart cards.
This system is completely designed and manufactured in accordance with “Coal Safety” standards, with reasonable structural design and adaptive improvements to the antenna part. It uses passive smart cards to design and manufacture information helmets. This is the first at home and abroad. This information helmet enables personnel to detect The system is more convenient and flexible.
2. Complete data statistics and information query software:
The system software is equipped with a dedicated database management system, including information collection and statistical analysis system for workers passing through tunnels, statistical and management analysis system for attendance operations, display and printing of various statistical reports, and provide a full range of queries and management for senior management Serve.
3. Highly automated:
This system is developed by using RFID (Radio Frequency Identification) technology. It can not only realize the safety control of personnel, the detection of attendance and violation of rules and regulations, but also the inspection of the object’s movement trajectory and the entry permit of the area, especially for dangerous And the monitoring of important places, the running track of personnel, the prohibition and warning of dangerous places, etc.
4. Two optional communication methods are used:
This system takes into account the differences in the requirements of different units of use, and adds a storage function to the internal micro-processing unit of the reader. There are two optional modes for the communication between the PC and the reader: one is optical fiber transmission mode, the reader receives the target signal, and after processing, it is directly transmitted to the PC; the other is RS485 half-duplex In communication mode, after the reader receives the target signal, it is temporarily buffered after being recognized by the internal microprocessor, and then transmitted to the host computer through the RS485 half-duplex mode. The networking mode is flexible and can be applied to a variety of environments.
5. Complete abnormal conditions (including illegal entry without card, invalid card, invalid card, blacklist card entry) alarm call system configuration.
Seven, system function
1. Display and query underground conditions:
(1) The number of people in the well or a certain place at any time, and the identity of each person;
(2) Query the current actual location of one or more people and the activity track of a certain person at any time;
(3) Inquire about a series of information such as the arrival and departure time and total working hours of relevant personnel at any location, so as to supervise and confirm whether important inspectors (such as gas inspectors, safety inspectors and management personnel) comply with regulations Carry out various inspections in time and place to reduce accident factors;
(4) Prohibition and warning of certain dangerous and important places;
(5) Network sharing can be realized, and multiple users can view the information within the authority through permission setting;
(6) With the attendance function, you can query the number of times one or more people enter the well per day, and the working time in the well;
2. Check the real-time dynamic distribution of underground personnel in the tunnel at any time, and make corresponding dynamic maps according to the actual conditions of the underground, so that the distribution of underground personnel is clear at a glance;
3. In the event of an emergency, the distribution and identity of the personnel in the accident area can be inquired at any time, and relevant personnel can be mobilized to deal with the accident and evacuation in time, which can provide accurate information for emergency rescue and disaster relief.
4. More accurately and quickly identify the specific location and location of persons in distress during emergency rescue, and improve rescue efficiency and rescue effect.
8. Summary
The application of radio frequency card recognition technology to the underground mine personnel management system is to establish a complete, flexible and real-time underground personnel management system, including the planning and arrangement of underground workers, the authority management of workers entering and exiting the tunnel, the distribution of tunnel personnel, and the information of workers. , Safe material flow, etc., to realize the informatization of underground management, and at the same time improve the level of mine mining production management and operation safety. This intelligent monitoring system is a new intelligent computer management system based on mine safety production, radio frequency identification module (RFID) as the main equipment, wired communication network as the link, and the PC of the supervision center as the hub. It comprehensively uses a variety of communications. Technology has broken through the traditional mine safety management model and is a new trend in the mine safety production management system.
Nine program provider introduction
Name: Laiwu Jiexun Electronics Co., Ltd.
Address: Chengshishi Electronic City, High-tech Zone, Laiwu City, Shandong Province (271100)
Contact number: 0634—8858678–810
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