A study of operating parameters of a roller mill with a new design

The paper analyzes the interrelation of: motion, particle size of ground rice grains, displacement, and grinding in a roller–plate mill. The purpose of the study was to analyze and evaluate technical conditions of use of a roller mill with a new design (UPRP P.422676 and EP18460051) of the roller working unit used in the chemical and food industry by means of useful granulometric product quality indicators. The influence of modifying the working unit by inserting a vertical plate between cooperating rollers on performance indicators – fineness, energy consumption, and performance – has been investigated. It has been shown that interrelation of motion, particle state, and the values of grinding indicators depends, among other things, on friction conditions, collision, cutting, new mill design features. The new design of roller mill assembly consists of two rotating rollers with outer rings, between which a grinding plate is fixed permanently and the rollers are connected to drive shafts. The mill is equipped with a hopper and a grinding product basket. The gaps between the rotating rollers and the friction plate are adjustable, depending on the nature of batch and requirements of the grinding product. Preferred gap sizes are below 0.10 mm. The technical advantage of the invention is that numerous grinding elements have been eliminated by introducing an integrated, dynamically balanced plate-and-roller system with cutting and grinding properties superior to those mentioned. In addition, the shape, relative motion, and form of rollers on outer rings and solid plate provide good conditions for moving the load in the preparation, grinding, and ejection space of the product, subject to crushing, uniform, gentle runs of loads, deformations and displacements to a given product dimension, for example, below 10 µm (colloidal milling), and with a different gap adjustment - less than 0.10 mm (fine milling). These have a positive effect on increasing performance, reducing power consumption and unit energy consumption, and eliminating wear of large structural elements of the mill, improving the economic and environmental characteristics of the processing of grainy materials.