工程机械各接合面的渗漏是机械车辆使用和维修中的一大难题。我院每年承接大量进口工程机械的修理业务。在大修从原西德引进的912挖掘机的过程中，发现其各个接合平面密封处竟没有使用一个密封垫，却能点滴不渗不漏。我们大修过密封面结构类似的多台整车和发动机，从未出现渗漏 The leakage of construction machinery joints is a major problem in the use and maintenance of mechanical vehicles. Our hospital each year to undertake a large number of imports of construction machinery repair business. During the overhaul of the 912 excavator imported from the former West Germany, it was found that none of the sealing surfaces of the joint planes actually used a gasket, but it did not drip drip. We have overhauled multiple vehicles and engines with similar sealing surfaces and never experienced any leakage