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本研究开发了一种按颗粒形状进行分选的转鼓型分选机。这种分选机应用在粒度约为50～120μm物料的分离，据我们所知，这是目前能够接形状分选的最小粒度。以颗粒的粘附力差别为基础，我们建立了一种颗粒的分离理论：球形颗粒与板面之间的粘附力比相同尺寸不规则颗粒大得多。这个结论已利用离心法通过对粘附力进行测量而得到了证实。转鼓型分选机已获得了美国和日本专利，它由外径150mm、长120mm的硼硅玻璃筒体和一个交流电磁铁组成。研究中使用的试样是球形玻璃颗粒和非球形玻璃颗粒的混合物。结果如下。在球形颗粒与不规则颗粒以1∶1的重量比例混合的情况下，分选的结果是球形产品中球形颗粒的含量为70－75％。当混合比例为3∶1时，球形产品中球形颗粒的含量为87％－90％。然而，对于类球形颗粒与不规则颗粒以1∶1的重量比混合的物料，产品中球形颗粒的含量在58％－73％之间变化。混合物料的处理量为0．3g／min，牛顿效率是20％－60％。这种分选机适用于陶瓷粉末、金属粉末或工业金刚石粉末的按形状分离。
In this study, a drum sorter that sorts by particle shape has been developed. This sorter is used in the separation of materials with a particle size of about 50-120 μm, to the best of our knowledge, this is the smallest particle size currently available for shape sorting. Based on the differences in the adhesion of the particles, we establish a theory of particle separation: the adhesion between the spherical particles and the plate surface is much greater than the irregular particles of the same size. This conclusion has been confirmed by centrifugation by measuring the adhesion. The drum sorter has been patented in the United States and Japan. It consists of a borosilicate glass cylinder with an outer diameter of 150 mm and a length of 120 mm and an AC electromagnet. The sample used in the study was a mixture of spherical glass particles and non-spherical glass particles. The result is as follows. In the case where the spherical particles and the irregular particles are mixed in the weight ratio of 1: 1, the result of the sorting is that the content of the spherical particles in the spherical product is 70 to 75%. When the mixing ratio is 3: 1, the content of spherical particles in the spherical product is 87% -90%. However, for spherical and irregular particles mixed at a 1: 1 weight ratio, the content of spherical particles in the product varied between 58% and 73%. The throughput of the mixed material is 0.3 g / min and the Newtonian efficiency is 20% -60%. This sorter is suitable for shape separation of ceramic powder, metal powder or industrial diamond powder.