The hammer end peripheral speed was selected based on preliminary studies carried out by the authors. Speed selection consisted of determining the speed at which the mill throughput while grinding triticale was greater than 2.77 ×10 -2 kg s-1.This value was determined by the authors.
In the course of the study, the following quantities were recorded automatically using a computer system: rotational speed of the rotor, torque on the rotor shaft, and the time of grinding the sample material. In addition, the following quantities were measured: mass of the material sample be- fore and after grinding, moisture content of the material before grinding, percentage share of each fraction in the fragmented material, and temperature of the material before and after grinding. The ambient temperature and humidity were monitored during the experiment.
The necessary number of replications for testing was set at k = 6. The experiment was planned according to a cross fourfactor classification 4 × (3 × 2 × 5). The testing schedule consisted of four classes representing the hammer mill rotor designs (one traditional and three new) as characterized by different hammer angles.
TEST STAND AND HAMMER MILL
To carry out the study of the grinding process with a hammer mill, a test stand containing the following elements
was designed and built: a modified hammer mill (WIR RB1.3) in which the traditional rotor or the new rotor design was used, measurement apparatus and instruments, and a computer system for storing and processing the measured data. The object of the experimental study was the modified hammer mill equipped with either the traditional rotor or the new rotor design. The test stand is shown in figures 3 and 4, and the specifications of the hammer mill are listed in table 3.