Nkọwa dị mkpirikpi:

1.use electromagnetic ọsọ mgbanwe, site na-agbanwe fan rotation ọsọ, iji dozie ikuku olu, nnukwu nso nke ikuku olu (350 ~ 1400rpm).

2.o nwere moto vibration n'ọnụ nri coveyor belt, hụ na a gaghị egbochi nri tii.