Online Gas Inspector Surveillance System

This subject gives a design on the online gas inspector surveillance system for substation in coal mine on the basis of analysis about existing condition and related production of gas monitoring and patrolling system in domestic and foreign. This paper mainly studies two parts in the design-the communication substation and the PC software.Using the infrared communication, the substation communicates with the gas detector, to get the gas concentration, the underground temperature and the relevant information of the inspector which is storage in the gas detector, such as the names and the codes. This design selects the chips named TSAL6200 and TSOP1838 as the infrared receiving and transmitting module.The substation communicates with the PC, using RS-485 communication technology. The chip named MAX1480, which interior integrates power isolation, signal isolate, and the peripheral circuit is easy to use, is selected as the power switch chip of RS-485.This design selects AT89C2051 as the processor based on the request, cost and other factors of this subject. The communication substation, which operating time is short each time and wastes little power, uses four 1st dry batteries and can replace half a year. When the battery is shortage and need to replace, this design uses indicator light to remind.The design of the PC software uses VC++.NET as the design and development environment, which has powerful features not only fulfils the existing function but also fulfils the improved design of this system in the future. The PC software mainly completes the surveillance of the gas inspector, the monitoring and warning of the gas concentration and temperature, and prints the relevant information in report forms. This software can also help the staff to query the historical data records.The system designed in this paper functions in good condition when it is used in Xintai Yatou coal mine. The design purpose of this system, to supervise the gas inspector and monitor the gas concentration, is achieved.