Research And Development Of The Monitor And Control System Of Gas

With the increase of demands to prevent gas calamities and to make use of gas, the research on gas deflation in coal mines will be developed fast. At present, most large mechanical-electric facilities of gas deflation and facilities of gas storage are overwatched by labor in our country. A little carelessness will lead to accidents; and the important parameters such as the gas thickness in the deflation pipeline and deflation flow capacity must be calculated termly by labor, which results in the inconvenience in administration. Coal industry urgently needs a kind of centralized and intelligentized monitor and control system which also has high reliability. The research on the Monitor and Control System of Gas in this paper are occurring in the situation above.The particularity of working environment of the system and the speciality of the Complex Programmable Logical Device (CPLD) and the Micro-Control Unit (MCU), is wholely considered in this paper, and the design scheme of double CPLDs and double MCUs is employed. This scheme integrates data-sampling, analyse and processing, controlling as well as data-communication, which allows the system to satisfy all demands of the project effectively and stably. According to the requirements of our customer, the Monitor and Control System of Gas and related sub-boards designed on the basis of the scheme can sample various signals and can determinate and process data synthetically. It also can control relevant executive part of the system and display all data and transmit them to the computer. At the same time, it can provide necessary sound and light alarm and can realize the communication between all modules by means of communication agreements. The reasonable application of the CPLD ensures the reliability of the system, and it is of great importance in the realization of system functions. This system use electric power carrier wave communication chips, the channels between which are changed to telephone lines, to realize the long-distance communication of data. In the process of design, some ideas and methods of the software engineering are applied to software design of the system, which makes the design, test and maintenance of software much more easy.This paper discusses the design of hardware and software of the system in detail. The CPLD is described in a chapter independently because of its importance and particularity. A conclusion is obtained at the last of the paper, several proposals of following work are given, too.To this day, five sets of this system have been used by our customer for about six months. All of them are operating normally and get full satisfaction and high praise of customers. Now feedback information from customers indicates that the Monitor and Control System for Gas has gained considerable economic and social benefits.