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50年代后期,随着Umbra筛子的应用,基于被A.魏纳(Wehner)称为“双路筛分”法原理而工作的筛分设备开始得以发展。从此第一代和第二代产品在市场上差不多消声匿迹了。这就为以“Liwell”(直线运动)命名而且得到普遍应用的第三代产品提供了发展机会。这种筛分机的特点是,在筛箱加速参数K仅为2.5时,筛板上的抛掷加速度为30～50g(g为重力加速度——译者注)。
In the late 1950s, with the Umbra sieve application, screening equipment based on the principle of “two-way sieving” by A. Wehner began to develop. Since then, the first and second generation products almost disappeared in the market. This provides development opportunities for the third generation of products, named and widely used by “Liwell” (linear motion). The characteristic of this type of screening machine is that the throw acceleration on the sieve plate is 30 ~ 50g (g is the gravitational acceleration) when the sieve box acceleration parameter K is only 2.5.