To avoid these two kinds of noise, the paper gived some requirements to the internal structure design of shock absorber, such as piston valve system, bottom valve system, piston rod etc.

为降低或消除这两种减振器噪声，提出了对减振器内部结构如活塞阀系统、底阀系统以及活塞杆等的设计要求。

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Working principle of two kinds of hydraulic clamping devices, which based on rod-less piston, is introduced, and the mechanics calculation formulas were also given.

介绍了两种基于无杆活塞的液压夹具，分析了其工作原理，给出了相应的计算公式。

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The utility model provides a pneumatic conveying device, which includes a cylinder body, a piston rod, a piston seal, air storage Chambers on two sides, a reverser, and each inside passage.

本实用新型提供一种气动输送装置，包括缸体、活塞杆，活塞封，两侧的储气室，换向器，各内部通路。

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