Qhov muab conveyor ntev pitch saw yog dav heev rau kev xa cov khoom lag luam los ntawm ib qho chaw mus rau lwm qhov.Nrog rau sab nraud cov menyuam txoj kab uas hla me dua qhov siab ntawm qhov txuas phaj, yog siv rau lub thoob of elevator thiab ntws conveyors.