液压支架所使用的液压元件品种多、数量大,发生泄漏难以避免,而泄漏会引起支架特性改变,甚至失效,严重时会影响采煤工作面正常生产。因此,准确、及时地检测出已泄漏的液压元件,并予以维修更换,对保证液压支架正常工作是煤炭生产所迫切需要解决的有实际意义的技术。　　为此,煤 Hydraulic support used hydraulic components of many varieties, the number of large, the occurrence of leakage is difficult to avoid, and leakage will cause changes in stent characteristics, or even failure, will seriously affect the normal production of coal face. Therefore, accurate and timely detection of leaked hydraulic components, and to be repaired and replaced, to ensure the normal operation of the hydraulic support is an urgent need to solve the coal production technology of practical significance. To this end, coal