重型矿山自卸车用塑料活塞环的研制

<title>velopment of Plastic Piston Ring for Heavy Mining Dumper

图1为77t重型矿山自卸车前悬挂液一氮缸用塑料活塞环，其工作状况是在巨大的压力和一定的温度下承受摩擦和挤压，工作介质为液压油。这就要求活塞环首先能承受较大的压力，避免在重压下发生压溃或产生较大的变形，以保护活塞与缸体不发生直接接触而产生拉缸现象；其次活塞环必须具有很好的耐磨性和自润滑性，以保证活塞环在使用中具有较长的使用寿命和尺寸稳定性；此外还要求活塞环应具有较高的耐温等级、耐油性能和硬度等一系列综合性能，以保证活塞环在高压、高温和强磨状态下依然具有良好的使用性能。

<abstract>sed on analysis of working condition, the plastic piston ring for mining dumper was designed and manufactured. The products have been assembled to the 77-ton mining dumpers by Benxi Heavy Automobile Manufacturing Co.,Ltd, and the dumpers have been running for more than 3000 hours on the mine-site without crush, wear and deformations. Now, the products have been put in production and application.