论文部分内容阅读
康明斯型发动机是目前我国矿用汽车主要使用的发动机.汽车的载重量由32吨到154吨,相应的康明斯发动机功率由336kw到1194kw.出于对安全性、可靠性及完好率的要求,发动机的故障诊断越来越引起人们的重视.下面谈谈机械振动分析法在康明斯发动机故障诊断中的应用.一、使用机械振动分析法的必要性由于现行的检测方法的局限性和康明斯发动机的一些具体结构特征,采用机械振动法很有必要.1 康明斯发动机使用PT泵供给系统,高压油的形成是在喷油副处,现有的一些检测高压燃油泵出口压力波形的方法难以实施;2,某些只适用于实验室的精密检测方法如转速波动等方法不适用于矿山点检时的不良条件;3.测缸压等需进行解体测量的方法不符合不解体检测的要求,经济性差,与矿山的生产要求不符.机械振动测量法只需将压电晶体传感器固定在康明斯发动机相应的的缸体表面,通过一定的设备采集振动信号,输入计算机处理,通过对振动情况的分析,就可对故障情况进行综合评判.它具有以下特点:(1)使用简单,省时;(2)精度高,定量分析性能好;(3)与油压、油温、水温、排气温度相结合,可得出更综合的全面的问题求解.由于康明斯型发动机机身大、功率大,相应的振动信号较明显,且传感器安装测试容易,故机械振动分析法便于使用.二、康明斯发动机?
Cummins engine is currently the main use of mining vehicles in China engine.The car carrying capacity from 32 tons to 154 tons, the corresponding Cummins engine power from 336kw to 1194kw.For safety, reliability and availability requirements, the engine Of the fault diagnosis more and more people pay attention to the following to talk about mechanical vibration analysis in the Cummins Engine Fault Diagnosis I. The necessity of using mechanical vibration analysis Due to the limitations of the current detection methods and some of Cummins Engine Specific structural features, the use of mechanical vibration method is necessary.1 Cummins engine using PT pump supply system, the formation of high-pressure oil at the fuel injection, the existing number of high-pressure fuel pump outlet pressure waveform detection method is difficult to implement; 2, Some methods that are only suitable for laboratory precision testing, such as speed fluctuation, are not suitable for the bad conditions at the time of mine inspection. 3. The method of measuring the cylinder pressure needed for disassembly does not meet the requirements of non-disintegration testing, And mine production requirements do not match.Mechanical vibration measurement method simply by the piezoelectric crystal sensor is fixed on the Cummins engine corresponding Body surface, through a certain equipment to collect vibration signals, enter the computer processing, through the vibration analysis, you can make a comprehensive assessment of the fault conditions. It has the following characteristics: (1) simple to use, time-saving; (2) high precision , And good quantitative analysis performance; (3) Combined with the hydraulic pressure, oil temperature, water temperature and exhaust gas temperature, a more comprehensive and comprehensive problem solving can be obtained. Because of the large Cummins engine body and large power, the corresponding vibration signal Obviously, and the sensor installation and testing easy, so easy to use mechanical vibration analysis method. Second, Cummins Engine?