负压抽吸系统(plc及变频器设计).doc

TONGJI ZHEJIANG COLLEGE 毕业设计（论文） 课题名称： 副 标 题: 系 名 称： 机械与电气信息工程系 专 业： 电气工程及其自动化 姓 名： 学 号： 啥啥 指导教师: 日 期： 2013年5月15日  中央负压抽吸系统变频控制设计 工艺图及PLC程序设计 09电气工程及其自动化 学号 指导老师 【摘要】 系统的设计、安装、调试工作量少【关键词】Central vacuum suction system frequency control design Process diagram and PLC programming Electrical Engineering and Automation jiangyangyang 091026 Adviser ganweiqin 【Abstract】With the continuous development of modern oral medicine, doctors and patients have become increasingly demanding of dental equipment. A good set of dental equipment, not only allows the doctor to cure the patient quickly and accurately, but also to make the patient feel comfortable and safe in the treatment process. The design of the PLC and inverter control vacuum suction system . PLC control with high reliability, strong anti-interference, ease of use, making the system design, installation, commissioning, greatly reducing the workload. Inverter control allows the motor speed is more energy efficient, reduce reactive power, but also achieve the purpose of the soft-start. The vacuum suction system pollutants in a timely and effective suction the patients mouth at the same time, but also ensures that no damage to the patients mouth; ensure good visibility of the treatment area; the contaminated aerosol sucked out from the patients mouth, liquid and mixture into the pipe the unit separation device, to centralized separation filter outside the clinic, so not only reduces the workload of the clean-up, avoid to cause secondary pollution in the consulting room. 【Key words】dental equipmentinverter control pollutant vacuum suction system 目 录 1. 1 1.1 背景及意义 1 1.2 课题设计的主要内容和主要方法 1 2. 系统设计 2 2.1 方案的选择 2 2.2 PLC和变频器的应用 3 2.2.1 PLC的原理及应用 3 2.2.2 变频器的原理和应用 4 2.3 电气原理图 4 3. 系统电器工艺图设计 5 3.1 电器工艺图设计需要注意的问题 6 3.2 元器件的选择 6 3.3 电器工艺图的绘制 11 4. 程序设计及分析 14 4.1 PLC程序