基于PLC控制的全功能液压综合试验台的研究

发布时间：2018-10-31 14:04

【摘要】：根据液压缸和液压泵试验的相关标准,在分析和研究液压综合性能试验台的基础上,对试验系统的软件和硬件进行总体的设计,研制出了能够自动完成液压缸型式试验和液压泵出厂试验的检测和试验系统。试验系统由液压控制系统、加载系统和计算机控制系统三部分组成。液压部分加入了电液比例控制技术进行了原理设计,实现了压力和流量的远程控制。对液压缸的启动压力特性试验、负载效率试验和内泄漏试验提出了新的试验方法。并使用AMESim建立液压系统的仿真模型,通过仿真技术得出系统的动、静态特性,从仿真结果可以看出,该试验台液压系统的试验方法和控制方式是合理的;加载台架的设计采用对顶液压缸的结构形式,这种结构形式能够模拟液压缸的实际工况进行试验;电气控制部分采用工控机为控制器,设计了基于PCI总线的接口电路,通过数据采集卡采集压力、流量和温度的数值,并用工控机中的程序进行处理。在试验和检测系统整体研制的基础上,着重对PLC控制系统进行了研究,从实际应用的角度出发,介绍了PLC的选型的原则和方法;结合试验台液压系统和控制系统需要完成的任务要求,阐述了PLC触点在试验台中的具体分配方法;并以耐压试验为例说明了PLC在耐压试验中的工作过程。采用WinCC Flexible软件设计PLC控制程序的操作界面,通过PC Access将PLC地址传给WinCC Flexible,从而只需操作简便生动的界面便可完成试验、采集数据和生成报表等任务。从试验台的实际应用效果来看,试验台的试验和检测系统达到了预期设定的目标,能够手动和自动完成国家标准中规定的全部试验,试验台具有测量结果准确、系统可靠性高等优点。为类似结构的检测和试验系统的开发提供了一个可行的技术参考,并为相似的试验台提供了一套完整而实用的研制方法。
[Abstract]:According to the relevant standards of hydraulic cylinder and hydraulic pump test, the software and hardware of the test system are designed on the basis of analyzing and studying the hydraulic comprehensive performance test bench. A testing and testing system for hydraulic cylinder type test and hydraulic pump factory test is developed. The test system consists of hydraulic control system, loading system and computer control system. In the hydraulic part, the electro-hydraulic proportional control technology is used to design the principle and realize the remote control of pressure and flow. A new test method is put forward for starting pressure characteristic test, load efficiency test and internal leakage test of hydraulic cylinder. The simulation model of hydraulic system is established by using AMESim. The dynamic and static characteristics of the system are obtained by simulation technology. From the simulation results, it can be seen that the test method and control mode of the hydraulic system are reasonable. The design of the loading bench adopts the structure form of the top hydraulic cylinder, which can simulate the actual working condition of the hydraulic cylinder to carry on the test. The interface circuit based on PCI bus is designed in the electrical control part. The data acquisition card is used to collect the values of pressure, flow rate and temperature, which are processed by the program in the industrial control computer. On the basis of the whole development of the test and test system, the PLC control system is studied emphatically, and the principle and method of PLC selection are introduced from the point of view of practical application. According to the requirements of the hydraulic system and control system of the test bed, the concrete distribution method of the PLC contacts in the test bench is expounded, and the working process of the PLC in the withstand voltage test is illustrated with the example of the voltage withstand test. The operation interface of PLC control program is designed by WinCC Flexible software. The PLC address is passed to WinCC Flexible, by PC Access, so that the task of experiment, collecting data and generating report form can be completed only with a simple and vivid interface. From the practical application effect of the test-bed, the test and test system of the test-bed has achieved the expected goal, and can complete all the tests stipulated in the national standard manually and automatically. The test bench has accurate measuring results. High system reliability and other advantages. It provides a feasible technical reference for the detection of similar structures and the development of test system, and provides a set of complete and practical research methods for the similar test bench.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.51

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