塑料活塞环结构参量的设计是在缸径为已知量的前题下，分别对活塞环厚度、活塞环轴向高度、活塞环线胀量等进行设计。
The parameter design of the plastic piston ring refers to designing the piston ring thickness, piston ring axial height and piston ring linear expansion in case that the cylinder bore is known.
介绍了用空心液压缸对旋转部件进行轴向力加载的原理，以及空心液压缸的结构和设计问题。
The principle of loading axially on rotating assembly using hollow hydraulic cylinder, as well as the structure and design of hollow hydraulic cylinder are introduced.
碳素压球机液压保护装置是由液压泵将高压油打入液压缸，使活塞产生轴向位移。
Carbon pressure ball machine device is a hydraulic pump hydraulic protection will be high pressure oil into the hydraulic cylinder, driving the piston produce axial displacement.
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