Foreword: my country is a large coal mine country. A large number of coal mine resources are hidden under the ground, and underground operations are inevitable. Therefore, how to ensure safe production and smooth coal mining has become the research focus of many coal mine safety workers. Facts have shown that the annual spontaneous combustion of coal is a major disaster in coal mines, which not only easily causes tens of millions of yuan in equipment losses, but may also cause casualties. Goaf is a key area prone to spontaneous combustion of coal, and early monitoring is very important. Temperature measurement is the most commonly used and most direct spontaneous combustion monitoring technology. One H32DT module of Haiwell can measure the temperature of 32 areas, with its own disconnection alarm, which is widely used in the coal mine temperature measurement industry. According to the requirements of goaf temperature monitoring, this paper uses Haiwei's mainframe, H32DT module, and H01ZB module to design a goaf temperature monitoring system that integrates ZigBee technology, programmable control technology, temperature sensor technology, and database technology.
Keywords: Haiwell (Haiwell) domestic PLC H32DT module H01ZB module coal mine temperature measurement
1. Introduction to coal temperature measurement network
Network diagram
2. The main hardware of the system2.1 Haiwell PLC
The Haiwell PLC host comes with 2 communication ports, which can be expanded to 5 communication ports. Each communication port can be programmed and networked, and both can be used as a master station or a slave station. Supports 1:N, N:1, N:N networking, supports various man-machine interfaces and configuration software, and can be connected to any third-party equipment with communication functions (such as inverters, meters, barcode readers, etc.).
2.2 H32DT module
The temperature measurement range of H32DT (32-channel temperature measurement module) is: -55°~125°, the digital chip determines the temperature, the highest measurement accuracy is 0.0625, the display accuracy is 0.1, and the collected temperature value has no error, and the cost is low. It can be used as an expansion module for any PLC host. The H32DT module comes with an RS-485 communication port, and can also be used as a remote IO module; external 24VDC power supply. H32DT can be used in a wide range of temperature measurement, such as industrial environments such as coal mines and tunnels. Each channel can connect 16 sensors, and a single module can collect 32 channels of temperature values.
2.3 H01ZB module and PC2ZB module
PC2ZB is an expansion module for wireless communication on the PC side. Through this module, the upper computer such as HaiwellHappy and the PLC host computer with the expansion of H01ZB can be connected and read and written in a wireless manner. The use of the module is simple and convenient, no need to configure zigbee parameters, and the network can be easily formed by flipping the dial switch that comes with the module. Based on the retransmission mechanism of the zigbee protocol itself, the module adds a response retransmission mechanism on the application layer, which further improves the stability of communication.
2. Part of the program
1. Haiwell PLC has its own RS232 and RS485 communication ports. It uses the host computer to read the temperature data of the coal mine site and understands the situation in time. Once the temperature exceeds the warning value, it will be handled in time to avoid unnecessary Property damage and casualties.
2. Underground and ground wiring is difficult. Once the line is aging or disconnected, it is difficult to troubleshoot. It takes a lot of time to deal with the line problem, and the site temperature can not be monitored for a long time. This system uses Haiwell’s HO1ZB module and PC2ZB module to build a wireless communication network. When there is no change in the on-site environment, there will be no communication disconnection, which completely solves the line problem.
3. Using the H32DT module, one module can monitor the temperature of 32 areas with low cost; the module itself has its own disconnection alarm, and the communication is stable; the module uses communication to read the data of DS18B20, and the digital chip determines the temperature with high accuracy. The module itself also has its own RS485 communication port. When the temperature measurement point is far away from the host, the module can be used as a remote module to reduce wiring and help measure the temperature in many places in the coal mine.
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