Developmental Research Of The Autocontrol Drainage System Under Coal Mine Well

The drainage under coal mine well is very important equipment for ensuring normal production of coal mine well. At present, most drainage systems of all domestic coal mine well adopt conventional means of relay controlling, inspected artificially. This kind means of inspection and control can't meet the requirement of coal development for its complicated control circuit, low reliability of equipment running and great working intension. The automatism drainage system designed in this text combined control by PLC with stakeout by PC, so that it made up a variety of limitation and shortage of conventional means of relay controlling and improved running reliability and stability. This system has characteristics of long operating life-span and convenient maintenance.According to actual conditions of some coal mine well, at first this text chose and designed drainage equipments, then designed autocontrol part based on drainage control request. This system adopts S7-300 PLC series produced by SIEMENS and has automatic, semiautomatic and manual working modes to choose. In order to prevent running water pumps and pipelines from wearing too badly and prevent electromotor and electric equipments of standby water pumps and pipelines from being affected with damp or their trouble not being found in time, water pumps and pipelines of this system are controlled to run in turn automatically. The number of running water pumps is confirmed by the principle of avoiding apex and filling vale in order to economize electricity. Automatic inspection program of PC on the spot, which was programmed based on Visual Basic 6.0, takes charge of inspecting running state and parameters of equipments so that trouble can be found and dealt with in time. S7-300 used Standard RS-232 to communicate with PC on the spot through Module CP340. At last, this text discussed anti-jamming measures of this control system.In conclusion, the automatism drainage system combiningPLC with PC has advantages that conventional system controlled by relay is unable to come up to. At the same time, this system has made up a variety of shortage of the automatism drainage system in existence. So it has very important meaning for secure automatic production of coal mine.