正确掌握机器的运用状态,才能判断机器的可靠性和制订维修作业。这对提高机器的利用率和充分发挥机器的经济效益,具有重要的意义。通常,采用目视检查、振动检测、金属磨粒分析和性能测定等方法,诊断机器内部状态的质量。它是一项涉及领域比较广、难度比较大的新技术。在各项诊断技术中,目视检查较为方便,应用最广,可以根据掌握的经验,从直观检查得到的机器零件状态,作为判断质量的依据。但是,在遇到难以观察和不易照明的部位,判断效果就受到很大影响。国外,从六十年代开始,就有应用光学纤维内窥镜检查机器内部的状态。近期更发展到用电视观察。美国、日本、苏联、英 Correct understanding of the state of use of the machine, to determine the reliability of the machine and the development of maintenance operations. This is of great significance to improving the utilization rate of the machine and giving full play to the economic benefits of the machine. Normally, the quality of the internal condition of the machine is diagnosed by means of visual inspection, vibration detection, metal abrasive particle analysis and performance measurement. It is a relatively wide area involved, more difficult new technology. In various diagnostic techniques, visual inspection is more convenient and the most widely used, according to the available experience, from the visual inspection of the machine parts state, as the basis for judging the quality. However, in the face of difficult to observe and difficult to illuminate the site, to judge the effect will be greatly affected. Abroad, from the sixties onwards, there are applications of optical fiber endoscopy to check the internal state of the machine. Recently more developed to use television observation. The United States, Japan, the Soviet Union, Britain