ECCENTRIC VIBRATORY MILLS FOR ULTRA-FINE COMMINUTION - KINEMATIC ANALYSIS

A description is given of a new single-tube vibratory mill - the eccen tric vibratory mill. The mill is the result of joint development work between the Institute for Processing and Landfill Technology from Clau sthal Technical University and Siebtechnik GmbH of Mulheim. Excitation of the mill takes place on one side through an out-of-balance drive f langed directly onto the grinding tube. In contrast to the homogeneous circular vibrations of conventional vibratory mills the eccentric vib ratory mill executes elliptical, circular and linear vibrations. This mill has enabled the specific power consumption of vibratory mills to be lowered by about 50 % and the throughput to be raised by a factor o f 2. The movements of the grinding tube are quantified with the aid of a kinematic model. The efficiency of the eccentric vibratory mill is confirmed by operating results from the building materials industry an d other branches of industry.