Cov PPR yeeb nkab clamps no, ua los ntawm eco- cov khoom siv PPR tus phooj ywg, yog ib qho -daim qauv tsim nrog tuab siv rau kev xeb thiab kev laus. U-puab clamps ruaj ntseg tuav cov kav dej hauv qhov chaw, tiv thaiv kev swb thiab suab nrov los ntawm cov dej ntws vibrations. Lawv tiv taus deformation thiab tawg, txawm tias siv sab hauv tsev lossis sab nraum zoov.
