INFLUENCE OF TRANSVERSE GROOVES OF EXTERNAL DRUM SURFACE OF CLOVER THRESHER-SCARIFIER KC-0.2 ON SEED THRESHING QUALITY

The paper presents the research results of drum-type clover thresher and scarifi er KC-0.2 with tangential feed. The drum surface consists of edged steel hexagonal rolled steel bars. To improve the effi ciency of threshing clover seeds, steel bars are provided with transverse grooves. The grooves have a triangular profi le, the width of which increases towards the drum’s outer diameter, thereby reducing the probability of groove clogging when processing wet clover hulls, while increasing the drum contact area with the processed material, and the sharp groove edges increase the destruction effi ciency of hard legume seeds. The authors have experimentally studied the effect of transverse grooves located on the trowel surface of the drum on seed wiping
and crushing. At the fi rst stage, a comparative study of seed threshing in a conventional way (without transverse drum grooves) and a new one (with transverse drum grooves) was carried out. It was found that the grooves reduce seed crushing in 2…3 times with a slight decrease in their threshing. At the second stage, the effect of the transverse groove depth and the drum speed on the seed threshing quality was studied by the method of experiment planning. The highest values of the threshing degree of red clover seeds at a nominal supply of 250 ±15 kg/h and the allowable crushing of seeds of 1.5% has been achieved at the following
combinations: the groove depth h = 2.0…2.8 mm and the drum speed n = 1545…1575 1/min.