毕业设计（论文）--基于PLC的农产品加工机械性能检测系统硬件设计.docVIP

基于PLC的农产品加工机械性能检测系统硬件设计 摘 要 随着社会的发展和科技的进步，人们对农产品加工机械产品的要求越来越高，而目前我国农产品加工设备品种繁多、规格复杂产品鉴定采用传统方法检测周期长、工作量大、效率低为了使农产品加工机械在大批量生产和投放市场之前达到国家规定的性能指标和要求本文根据现场要求和系统技术指标采用数据采集技术和PLC控制技术研究和设计了农产品加工机械性能检测系统。 本文首先概述了计算机控制系统和PLC在工业控制中的重要性分析了农产品加工机械产品的质量现状。其二介绍了数据采集技术及PLC控制技术。其三提出了检测系统的总体设计方案设计了检测系统的硬件。通过数据采集卡PCL813采集现场各个传感器传来的数据然后通过工控机的PCI数据总线把数据传给上位工控机工控机与下位机PLC之间采用RS232C进行串行通信PLC控制农产品加工机械的性能检测系统PLC与变频器之间通过RS485串口通信变频器通过改变交流变频电动机的频率从而控制交流异步电动机的转速从而控制原料的流量。 关键词： PLC，数据采集，，变频器 The Hardware Design of Agricultural Products Processing Mechanical Property Examination System Based on PLC ABSTRACT With the development of the society and the progress of technology, people’s request to the agricultural products processing mechanical products is more and more high, but agricultural products processing machines are various in style and complicated in specification in our country. Products examination with traditional method exist the following questions: long measure cycle, heavy work load, low efficiency. In order to make the agricultural products processing machines can reach the performance and requirement that the country stipulates before producing in enormous quantities and putting on market, this article adopts data acquisition technology and PLC control technology to research and design the hardware of performance examination system about agricultural products processing machines in foundation the require live and systematic technical indicator. Firstly, this article summed up the importance for the computer control system and PLC in industrial control and analyzed the quality current situation of agricultural products processing machines. Secondly, the article recommended the data acquisition technology and PLC control technology. Thirdly, the article proposed the overall design scheme of the examination system, designed the hardware of the examination system. Data acquisition card PCL813 gathers the data transmitted by the testing scenes each sensor, and then the data are tran