毕业论文完整版--魏建忠.doc

2011 届 华北科技学院 本 科 毕 业 设 计（论 文） 设计(论文)题目： 基于PLC控制 姓 名: 学 号: 20002014109 专业班级: 电气B01班 系(部、院): 机电系 指导教师: 江静 2011年6月日  Abstract：’t push out in time, it will threaten the produce of the coal mine and the safety of the workers. The drainage system is one of the most power expenditure systems in the produce of the coal mine. If the drainage system is controlled effectively, and it becomes a high-performance, low-power dissipation, ecumenical, reliable system, it will economize the cost of the produce of the coal mine effectively. In addition, if the mine water can be push out in reason and effectively. It may solve the problem well that most coal mine lack water.. The control on the basis of the programmable logic controller that revolves about the microprocessor is replacing the control basing on the relay, and it is being applied universally in the field of auto control of every walk of life. But in the coal industry, it applies very little, because of the rugged environment in the mine. At the present time, the most coal mine drainage system still use the control basing on the relay in our country, and the monitoring of the water level, the turning on and off of the pump, the selecting of the pump are all manipulated by the manpower. In these systems, the equipments are laggard, and the manipulation is complicated, and the running is unreliable, and the worker’s intensity of labor is very heavy. These faults confine grievously the heightening of the control lebel and the economic benefit of the mine drainage system. Combining the current excellent industrial control technology, this paper research and develop the coal mine drainage automatic control system fitting the practical situation of our country. Its central control unit is Mitsubishi FX2N series PLC, and it expands the necessary digital quantity input units, the analog quantity input units, and the communication. Thes