Batch thresher for threshing individual soybean plants

The design of MRS-1 thresher was developed in the mechanization department of V.S. Pustovoit All-Russian Research Institute of Oil Crops (Krasnodar). It is designed for threshing individual soybean plants, primary cleaning of seeds on the screen separator from fruit hulls and unthreshed beans, separation of unthreshed beans form fruit hulls by air in the air separator and collection of seeds of each individually threshed plant in the unloading container. The results of the laboratory research on the MRS-1 thresher give evidence that at threshing of beans in two stages the pre-threshing is performed by a rubber roller with an optimal rotational speed ranging from 25-30 Hz in a first-stage dehuller with a spring-loaded deck and final threshing in a second-stage dehuller by passing the beans with a toothed conveyor belt through a second-stage dehuller with a spring-loaded toothed roller, the optimal rotational speed of the latter varies between 18-21 Hz and that of the second-stage dehuller roller - between 23-25 Hz, while control of the threshing process is performed by a control roller rotating in the rotational direction and at the frequency of the second-stage dehuller rolled with circumferential speed 50 % lower than that of the second-stage dehuller roller. The developed design of the thresher for the individual soybean plants enables complete threshing of beans with a minimum seed injury of no more than 1 %, which ensures a gentle, crumbling principle of opening the beans and the seeds are getting into the unloading container without the vegetative mass of a plan