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纵观国内工程机械领域，电液控制正朝着高压、高速、高精度方向发展。液体工作介质的清洁度对系统的性能和可靠性有很大的影响，据国内外资料统计，工程机械液压系统的故障约有７０％８０％是由于液压系统污染引起的，在各类污染物中固体颗粒是液压系统中最普遍且危害性最大
Throughout the field of domestic construction machinery, electro-hydraulic control is moving in the direction of high pressure, high speed and high precision. According to statistics from home and abroad, about 70% 工80% of the hydraulic system failures of construction machinery are caused by the pollution of the hydraulic system. In all kinds of pollution, the cleanliness of the liquid working medium has a great influence on the performance and reliability of the system. Solid particles in the material are the most common and hazardous in hydraulic systems