Underground personnel positioning and equipment wireless temperature measurement system
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1. Application background
The coal industry is a key industry with frequent occurrences of safety accidents in my country. In 2009 alone, the number of people killed in more than 10 incidents included:
On February 22, 2009, a gas explosion occurred in the fourth panel of the Tunlan Coal Mine of Shanxi Xishan Coal and Electricity Group, and 78 people were killed;
On April 4, 2009, a water penetration accident occurred in the Jinli Coal Mine of Tianyuan Company, Jiguan District, Jixi City, Heilongjiang, and 12 people were killed;
On May 30, 2009, a huge gas explosion occurred in Tonghua Coal Mine in Qijiang County, Chongqing City, killing 30 people;
On June 17, 2009, a flooding accident occurred in Xinqiao Coal Mine, Zhongying Town, Qinglong County, Qianxinan Prefecture, Guizhou, and 16 people were killed;
On September 8, 2009, a fire accident occurred in the Wangjiayu Mine of Jinyuan Mining Company, Lingbao City, Henan Province, and 13 people were killed;
On September 9, 2009, 54 people were killed in a gas explosion accident at Xinhua No. 4 Mine in Pingdingshan, Henan;
… …
The geological storage conditions of China’s coal mines are complex, with a large number of high-gas mines and a low degree of mining automation. More than 95% of them rely on underground mining, and mining disasters occur frequently. How to enhance production safety while increasing production capacity, and quickly and efficiently search and rescue in the event of an accident, thereby reducing the mortality rate is a problem that every mine manager needs to think about.
At present, large and medium-sized coal mines in my country have been equipped with various coal mine safety production monitoring systems. The application of these systems has improved the safety production status of coal mines in my country. However, there are still general difficulties in the management of personnel entering the well, the personnel on the well cannot timely understand the dynamic distribution of the personnel under the mine, and the heating of coal mine equipment cannot be detected in time. Once an accident occurs, it is impossible to accurately locate the location of the underground personnel, and it is difficult to carry out timely and reliable rescue. The efficiency of safety rescue is low and the effect is not ideal.
2. System principle
The downhole personnel positioning and equipment wireless temperature measurement system is developed based on the latest ZIGBEE technology, real-time data acquisition and transmission methods, and advanced software design concepts. The downhole personnel positioning and equipment wireless temperature measurement system establishes a complete, flexible and real-time monitoring and management system to control the location and distribution of underground operators, access rights management for roadways, production plan arrangements, safe flow of production materials and equipment heating Dynamic tracking and control of conditions, etc., in order to realize the informatization and visualization of underground management, and improve the level of coal mining production management and operation safety.
2.1. Function realization
1) Tracking function of downhole production personnel and equipment
The high-precision monitors of the downhole personnel positioning system are distributed in the main sites, working surfaces and roadways in the underground. When the production staff or equipment wearing the electronic identification card passes through the identification area of the monitor, the monitor will receive the electronic identification card ID number, and transmit the ID code to the Inoue Monitoring Center. Each ID code is unique. Through this ID code, the movement trajectory of each employee or equipment entering and exiting the well can be identified, so as to realize the tracking and management of the target. The underground personnel positioning system implements an active monitoring method, the measured target has no burden, and the recognition distance is long. The underground workers do not need to increase the carrying equipment, and do not need to take the initiative to carry out any operations.
Based on the above technical design, the underground personnel tracking management system can realize:
Tracking of moving targets: The system combined with the underground electronic mine map can display the number and distribution of personnel in the entire mine, various panels and coal seams in real time; display the moving route of the designated personnel; locate and track the designated personnel; query the specific personnel in the underground s position. The positioning information can be displayed in real time, and the positioning information at a certain historical moment can also be queried.
2) Attendance and daily management functions of production personnel
Production attendance and personnel management: It can accurately count the time of mine workers and risers, and can generate reports such as daily attendance and monthly attendance statistics according to shifts and departments. At the end of each shift, the staff on duty are counted. If any personnel are found to be missing, the alarm will be reported for the on-duty personnel to check; if the personnel are found to be working underground for more than the specified time, the system will automatically alarm and give a list of relevant personnel and other information, and pass at the same time Radio frequency tag alarms to notify relevant personnel. When an emergency occurs in a mine, the location of personnel can be quickly determined, and search and rescue work can be carried out in time.
3) Wireless temperature measurement system for downhole equipment
The downhole equipment itself and the connection point between the equipment will generate heat. As the load increases, the connection point heats up and forms a vicious circle: temperature rise, expansion, contraction, oxidation, resistance increase, and heat up again until an accident occurs.
The wireless temperature measurement system is mainly aimed at monitoring the temperature of the device itself and the connection point between the devices. In case of high temperature, the system will send out an alarm to notify the manager to take timely measures to prevent accidents from causing loss of personnel and property.
The wireless temperature measurement system of Haotian technology equipment has the following characteristics:
The introduction of radio frequency technology makes the collection safe and reliable
The computer can automatically determine the temperature of each monitoring point according to the ID number of the temperature probe
The wireless transmission method is adopted, which is convenient for installation and maintenance, low cost, and guarantees the safety and flexibility of the power grid system
The sensor transmits data automatically and regularly for 24 hours, and the computer collects and records the temperature data of all monitoring points in real time, and alarms immediately when abnormalities are found
The system has the function of predictive analysis, which can give early warning in time and eliminate the fault in the budding state
The digital temperature sensor is used to directly measure the temperature of the power contact, which improves the accuracy of the system
Using watchdog circuit and encryption unit, the circuit can make the system reset automatically, making the transmitted data more reliable
2.2. System composition
Underground personnel positioning system
The downhole personnel positioning system adopts ZIGBEE identification technology, and the identification carrier is composed of an electronic identification card and a monitor.
1) Electronic identification card
The data carrier of the identification system, which contains the identification code (ID) information of the label;
2) Monitor
After receiving the microwave synthesis signal reflected by the electronic identification card, read the ID information in the electronic identification card, and then send the information to the ground monitoring center;
Schematic
Equipment wireless temperature measurement system
1) Temperature sensor
Measuring the temperature of the device itself and the connection point between each device, each sensor reading head has unique (ID) information;
2) Temperature monitor
After reading the data of the temperature monitor and the ID information of the sensor reading head, send the information to the ground monitoring center;
3. System composition
3.1 The composition of the downhole part
Underground personnel positioning system
The downhole part realizes the reading of employee or equipment identification code data, and transmits it to the uphole part in real time via the explosion-proof cable.
The underground part uses explosion-proof cables as the main transmission path (in the form of CAN bus), which is mainly composed of card reading substations, electronic monitors, and explosion-proof power supplies. The card reading substation is fixedly installed at the entrance and exit of each main roadway, and the data information of the monitor under the card reading substation is summarized. Electronic monitors are installed in major or dangerous locations underground, such as intersections, working faces, dangerous places (such as blind lanes, tunneling heads, etc.), and main entrances and exits on the ground, and other places that need to be monitored. Data inspection and signal collection are continuously carried out. The entire downhole system is installed in a distributed manner to ensure the stability and reliability of the system. Electronic identification cards are divided into employee identification cards and equipment identification cards. The employee identification card is worn by the employee (such as installing the employee’s helmet, belt or miner’s lamp, etc.) without additional carrying equipment. The equipment identification card is installed on the bulk equipment that needs to be monitored for going up and down or moving targets, such as vehicles.
Equipment wireless temperature measurement system
The reading head of the temperature sensor is placed in each device and device connection point where the temperature needs to be detected. The manager holds the temperature sensor, reads the temperature data information collected by the sensor, and transmits this information to the data terminal. The system interruption can be set If the temperature limit value exceeds the limit value, the system will issue an alarm to notify the manager so that the manager can take measures in the first time.
System principle
3.2 Inoue part
According to the received ID codes of each employee and equipment, the Inoue part matches the ID information corresponding to each ID code in the database, such as name, team, type of work, etc., and displays it on the monitoring screen in real time and stores it in the computer database for future use.
The Inoue part uses Ethernet as the main transmission channel, including database servers, monitoring computers, printers and other equipment located in the monitoring center. The database server stores the personnel name or equipment name, grouping, shift number, attendance record and other data information corresponding to the electronic identification card. Through the electronic identification card information collected in real time, matching the personal and equipment information recorded in the database server, the tracking and positioning of underground personnel and equipment can be completed in real time. Using the local area network can also enable the Work Safety Supervision Bureau, the Mining Bureau and related clients (related departments) to understand the conditions of underground personnel and equipment in real time.
4. System flow
Underground personnel positioning system:
When an employee or device carrying an electronic tag passes through the identification area of the monitor, the monitor will be activated and the identification information of the monitor will be sent to the monitor;
After the monitor receives the personal information, it will be processed and sent to the upper card reader station;
The card reader station transmits data information to the well through the explosion-proof cable in real time;
The monitoring dynamics receives information from various downhole electronic monitors and extracts the information stored in the database. Managers can see the status of monitoring targets in real time, perform lock-in monitoring of different areas or pending targets, and dynamically manage and dispatch controlled personnel and equipment. Ensure that corresponding emergency measures can be taken in an emergency.
The coal mine safety information monitoring system is a collection, input, storage, retrieval, query and analysis of spatial data in one. Through the account authorization form, different clients can be authorized, so that each relevant department can understand the activity trajectory of a specific group member.
Equipment wireless temperature measurement system:
Install temperature sensor tags on each device and device connection point that needs to monitor temperature changes
The wireless node of the Internet of Things reads the ID information and temperature value of the sensor tag, and transmits it to the system terminal wirelessly
The system terminal will record and compare the temperature value. If the limit value is exceeded, the system will issue an alarm to inform the administrator that there is an abnormal phenomenon.
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