高精度粉体安息角测定仪的设计

Design of High Precision Measuring Apparatus for Stopping Angle of Powder

安息角是一个重要的粉体力学性能参数,按照现行的测量方法,其测量值往往波动很大。文中对原有的安息角测量装置进行了改进,增设一高速旋转的毛刷,对粉体实施预分散,从而显著降低了物料下落时产生的震动和冲击,同时让粉体下落至一个圆台,以控制其锥形大小。采用两类细度不同的钢渣粉体就新老两种方法的安息角测试对比,结果表明：新装置结构简单,测量速度快,测试精度高,测量值的相对平均偏差由5．61%降低到1．73%．

Powder＇s stopping angle （PSA） is an important performance factor about powder＇s mechanics, but its measured data generally shows a large undulation with traditional measuring method. In order to solve the problems, a new improved measuring apparatus of PSA was designed and made. The new apparatus added a high-speed spinning brush to predisperse measured powder before it falls. So it could avoid the aggregation of particles and decrease the vibration and shock forces caused by the falling powder effectively. A rounded platform was set under powder funnel to limit the dimension of powder＇s cone. Two series of steel slag with different fineness were used in contrasting tests between the new and traditional apparatus. The results indicated that the new apparatus, with a simple structure, had higher measuring speed and measuring accuracy than traditional apparatus, and RSD was decreased from 5.61% to 1.73%.