Abstract
The principal disadvantages of mills utilised for fine and ultrafine grinding processes are the restricted product fineness and the low energy efficiency. As a solution of the problem, new principle of the grinding process and innovative design of rotor-vibration type of mill are proposed. The mill design is based on the Rebinder effect, which serves to reduce the particles strength and, consequently, increasing product fineness and energy efficiency. As an example of the rotor-vibration type of mill, the design including oval rotor, grinding media, vibration drive with spring elements is presented in the paper. The originality of the mill design is the oval shape of the rotor. However, due to the originality of the shape of oval rotor, there are no approaches to determining the geometric parameters of the rotor (major and minor semi-axis, height). Consequently, an approach is presented for determining the geometric parameters of a new oval-shaped rotor design in innovative rotary-vibratory type mills. The research results can be used in the design process of new mill designs based on rotor-vibration method of fine and ultrafine comminution.