Since 1990s, foreign vibrating plate ram gradually to enter the Chinese market.
上世纪90年代以后，国外的振动平板夯陆续进入中国市场。
In 1986, changsha construction machinery research and develop a larger HZR450 type of vibrating plate ram.
1986年长沙建设机械研究所又开发了较大的HZR450型振动平板夯。
The motion process of vibrating plate ram was analyzed, and the force bearing formulae of plate ram was derived.
分析了振动平板夯的运动过程，导出了平板夯的受力公式。
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