Underground personnel positioning and wireless temperature measurement system for equipment

1Application background

The coal industry is currently a key industry in China with a high incidence of safety accidents2009Annual death toll exceeds10Events involving people or more include:

2009year2moon22dayA gas explosion accident occurred in the Nansi Pan area of Tunlan coal mine under Shanxi Xishan Coal and Electricity Group,78Human casualties;

2009year4moon4dayA water leakage accident occurred underground at Jinli Coal Mine of Tianyuan Company in Jiguan District, Jixi City, Heilongjiang Province,12Human casualties;

2009year5moon30dayA major gas explosion occurred at Tonghua Coal Mine in Qijiang County, Chongqing,30Human casualties;

2009year6moon17dayA water leakage accident occurred at Xinqiao Coal Mine in Zhongying Town, Qinglong County, Qiannan Prefecture, Guizhou Province,16Human casualties;

2009year9moon8dayA fire accident occurred in Wangjiayu Mine of Jinyuan Mining Company in Lingbao City, Henan Province,13Human casualties;

2009year9moon9dayThe gas explosion accident at Xinhua Fourth Mine in Pingdingshan, Henan Province,54People died;

... ...

The geological burial conditions of Chinese coal mines are complex, with a large number of high gas mines and a low degree of mining automation,95%The above needs to be mined by underground workers, and mining accidents occur frequently. How to strengthen safety production while increasing production capacity, and quickly and efficiently conduct search and rescue in case of accidents, thereby reducing mortality rates, is a problem that every mining area manager needs to consider.

At present, large and medium-sized coal mines in China have been equipped with various coal mine safety production monitoring systems, and the application of these systems has improved the safety production situation of coal mines in China. However, there are still widespread difficulties in managing personnel entering the well, with on-site personnel unable to timely understand the dynamic distribution of underground personnel, and coal mine equipment heating not being detected in a timely manner. Once an accident occurs, it is impossible to accurately locate the location of underground personnel, making it difficult to carry out timely and reliable rescue. The efficiency of safety rescue is low, and the effect is not ideal.

2System principle

The underground personnel positioning and equipment wireless temperature measurement system is based on the latest technologyZIGBEEA wireless temperature measurement system for underground personnel positioning and equipment developed based on technology, real-time data collection and transmission methods, and advanced software design concepts. The underground personnel positioning and equipment wireless temperature measurement system establishes a complete, flexible, and real-time monitoring and management system to dynamically track and control the location and distribution of underground workers, access control of tunnels, production plan arrangement, safe flow of production materials, and equipment heating status, in order to achieve informationization and visualization of underground management and improve the level of coal mining production management and operation safety.

2．1Function implementation

1）Tracking function of underground production personnel and equipment

The high-precision monitor of the underground personnel positioning system is distributed in various main places, working faces, and tunnels underground. When production employees or equipment wearing electronic identification cards pass through the recognition area of the monitor, the monitor will receive the identity number of the electronic identification card and transmit the identity code to the underground monitoring center. Each identity code is unique, and through this identity code, the movement trajectory of each employee or equipment entering and exiting the well can be identified, thereby achieving target tracking and management. The underground personnel positioning system adopts an active monitoring method, with no burden on the measured target and a long recognition distance. Underground workers do not need to carry additional equipment or take any proactive actions.

Based on the above technical design, the underground personnel tracking and management system can achieve:

Tracking of moving targets: The system, combined with underground electronic mine maps, can display in real-time the number and distribution of personnel in the entire mine, as well as in each panel and coal seam; Display the movement route of designated personnel; Locate and track designated personnel; Query the location of specific personnel underground. It can display real-time positioning information and also query the positioning information of a certain historical moment.

2）Attendance and daily management functions of production personnel

Production attendance and personnel management: Able to accurately record the time of miners entering and exiting the well, and generate daily and monthly attendance statistics reports by shift and department. At the end of each shift, count the personnel on duty. If any personnel are found to be lost, report to the police for verification by the on duty personnel; If personnel are found working underground for more than the prescribed time, the system will automatically sound an alarm and provide a list of relevant personnel and other information. At the same time, an alarm will be triggered through radio frequency tags to notify the relevant personnel. When an emergency occurs in the mine, the location of personnel can be quickly determined and search and rescue work can be carried out in a timely manner.

3）Wireless temperature measurement system for underground equipment

The underground equipment itself and the connection points between the equipment may experience heating phenomena. As the load increases, it causes the connection point to heat up and form a vicious cycle: temperature rise, expansion, contraction, oxidation, increased resistance, and further heating until an accident occurs.

The wireless temperature measurement system mainly monitors the temperature of the device itself and the connection points between devices. If encountering high temperatures, the system will issue an alarm to notify managers to take timely measures to prevent accidents from occurring and causing losses to personnel and property.

The wireless temperature measurement system of Zhikuan Information Equipment has the following characteristics:

The introduction of RF technology makes data collection safe and reliable

Computers can detect temperature probes based on their capabilitiesIDAutomatically determine the temperature of each monitoring point

Adopting wireless transmission method, easy installation and maintenance, low cost, ensuring the safety and flexibility of the power grid system

sensor24Automatically transmit data at regular intervals every hour, and the computer collects and records temperature data from all monitoring points in real time. If any abnormalities are found, an alarm will be immediately triggered

The system has predictive analysis capabilities, which can provide timely warnings and eliminate faults in their early stages

The use of digital temperature sensors to directly measure the temperature of power contacts has improved the accuracy of the system

By using watchdog circuits and encryption units, the circuit can automatically reset the system, making the transmitted data more reliable

2．2System composition

Underground personnel positioning system

The underground personnel positioning system adoptsZIGBEEIdentification technology, the identification carrier consists of an electronic identification card and a monitor.

1)Electronic identification card

The data carrier of the identification system, carrying the identity code of the tag（ID）Information;

2)monitor

After receiving the microwave synthesized signal reflected back from the electronic identification card, read the signal from the electronic identification cardIDInformation, and then send the information to the ground monitoring center;

schematic diagram

Wireless temperature measurement system for devices

1)temperature sensor

The temperature of the measuring device itself and the connection points between each device, each sensing head has a unique（ID）Information;

2)Temperature monitor

After reading the data from the temperature monitor and sensing headIDInformation, send the information to the ground monitoring center;

3System composition

3．1Composition of underground parts

undergroundPersonnel positioning system

The underground part realizes the reading of employee or equipment identity code data, and transmits it in real time to the above part through explosion-proof cables.

The underground part uses explosion-proof cables as the main transmission route（CANBus form, mainly composed of card reading substation, electronic monitor, explosion-proof power supply, etc. The card reading substation is fixedly installed at the entrance and exit of each main roadway, and the data information of the monitors under the card reading substation is summarized. Electronic monitors are installed in major or hazardous locations underground, such as intersections, workfaces, and hazardous areas(Such as blind alleys, excavation heads, etc)Install at the main entrances and exits on the ground where monitoring is required, and continuously conduct data inspections and signal collection. The entire underground system is installed in a distributed form to ensure the stability and reliability of the system. Electronic identification cards are divided into employee identification cards and device identification cards. The employee identification card is worn by employees at all times (such as on their safety helmets, belts, or mining lamps), and does not require additional equipment. The device identification card is installed on bulk equipment or moving targets that need to be monitored when going up and down the well, such as vehicles.

Wireless temperature measurement system for devices

The reading head of the temperature sensor is placed at each device and device connection point where temperature needs to be detected. The management personnel hold the temperature sensor, read the temperature data information collected by the sensor, and transmit this information to the data terminal. The system interrupt can set the temperature limit value. If the temperature 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 Principles

3．2Inoue section

The Inoue section matches the identity information corresponding to each employee and device ID code received in the database, such as name, team, job type, etc., and displays it in real-time on the monitoring screen and stores it in the computer database for backup.

The Inoue section uses Ethernet as the main transmission method, including database servers, monitoring computers, printers, and other equipment located in the monitoring center. The database server stores data information such as personnel names or equipment names, grouping, shift numbers, attendance records, etc. corresponding to the electronic identification card. By collecting real-time electronic identification card information and matching it with personal and device information recorded in the database server, the tracking and positioning of underground personnel and equipment can be completed in real time. By using a local area network, the safety supervision bureau, mining bureau, and related clients (departments) can also have real-time access to the situation of underground personnel and equipment.

4System Process

Underground personnel positioning system:

When employees or devices carrying electronic tags pass through the recognition area of the monitor, the monitor will be activated and the identification information of the monitor will be sent to the monitor;

After receiving personal information, the monitor processes it and sends it to the upper level card reading substation;

The card reading substation transmits real-time data information to the well through explosion-proof cables;

Monitor the dynamic reception of information from various underground electronic monitors and extract information stored in the database. Management personnel can see the real-time situation of monitoring targets, lock in monitoring different areas or pending targets, and dynamically manage and schedule controlled personnel and equipment. Ensure that corresponding emergency measures can be taken in a timely manner in case of emergency.

The coal mine safety information monitoring system is an integrated system that collects, inputs, stores, retrieves, queries, and analyzes spatial data. Through account authorization, different clients can be authorized to enable relevant departments to understand the activity trajectories of specific group members.

Wireless temperature measurement system for devices:

Install temperature sensors on each device and device connection point that needs to monitor temperature changeslabel

The wireless node of the Internet of Things reads the sensor tagIDInformation and temperature values are transmitted wirelessly to the system terminal

The system terminal will record and compare the temperature values. If it exceeds the threshold, the system will issue an alarm to inform the administrator of any abnormal phenomena.