数控机床润滑系统液位测量智能节点设计.docVIP

数控机床润滑系统液位测量智能节点设计 摘 要 本设计从实验研究分析的角度分析了超声波测距系统的基本设计原理以及目前国内外此类测距系统存在的问题详细介绍超声波测距系统根据该系统设计对一个或多个被测点液位进行测量。是一种实时检测液面高度的测距系统当达到设定警戒位置时，可以向上位机报警。整个系统在设计过程中基于成本考虑，选用市场上通用元件。超声波距离传感器采用压电元件锆钛化铅，一般称为RZT，这种传感器的特点在于方向性。测距系统利用超声波距离传感器的“回声”现象制成的，工作时向润滑液位发射超声波，测定超声波液面后返回的时间，就可以得到润滑液面的高度。 超声波检测通过传播时间的测量来实现，这种方法在工业测量中应用较为广泛。在声速C已测知的媒介中，利用声波传播距离L和传播时间t的关系式L=Ct就可测得距离。这是超声波测量位移的基本关系式。 实际中，测量位移采用的是脉冲回波法，先激励超声波探头发射超声波，超声波遇到被测物后反射回来即所说的回波，于是探头接收回波，记录下从超声波发射到接收的时间t，由于从发射到接收，超声波所走路程约为超声波探头到被测物表面位移的两倍，因此，可以计算出超声波探头到被测物的L=Ct/2，C为声速可以看出，测量的关键是要准确的测量时间t。 关 键 词：超声波单片机，液位测量，智能节点 The design of lubrication Level Measurement System as the Intelligent Node in the NC machine ABSTRACT In this text the design analyses the basic design principles of ultrasonic ranging from the perspective of experimental research and analysis and the current location of such systems at home and abroad exist. The text detailed account of the ultrasonic ranging system, develops the applications in the NC machine lubrication system level measurement and as smart nodes of NC system on one or more measured point liquid level measurement. It is a real-time detection of the surface height ranging system. When the surface height goes to location to set warning the system can alarm to the total system. The entire system in the design process bases on cost considerations, all chooses the common components on the market. Ultrasonic distance sensor uses the piezoelectric element commonly known as RZT. This sensor is characterized by very directional. Ranging system uses ultrasonic distance sensor echo made of the phenomenon. When it is working it can eradiate the ultrasonic to the level of lubrication, measure the time between ultrasonic eradiating and returning after encountering the lubrication Level. In this way we can measure the high of lubrication level. We can detect the level by measuring propagation time of the ultrasonic. This method is used much widely in industrial measurement. When C is the velocity measurement known