实践证明，该液压破碎锤具有结构简单，冲击能和冲击频率可无级调节，节能，维修方便等优点。
It is verified that the new hydraulic breaking hammer features simple structure, stepless adjustment of impacting power and frequency, power saving, easy maintenance, etc.
通过理论和实验证明改变液压夯管锤的冲击能和冲击频率，比较简单而经济的方法是调节液压夯管锤的行程，并讨论了改变行程对液压夯管锤的性能有哪些影响。
The theory and test proved that the impacting frequency of hydraulic rammer can be adjusted by pipe hammer stroke. The influences of stroke on characteristics of hammer are discussed.
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