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。
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。
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