Mechanism Design and Life Assessment of Gravity Driven Descending Multi-stage Thin-Walled Telescopic Tubes
A heavy-duty manipulator with long travel distance along z axis is needed in the hot cells of nuke industry,therefore dedicated telescopic tubes were designed.The telescopic tubes consisted of several thin-walled tubes with different diameters.A new supporting structure between the mobile telescopic tubes was proposed,which was called adjustable roller bearing,such that the tele-scopic tubes could be moved freely.The interval between rollers and tube wall could be eliminated by properly adjusting,the support ri-gidity and stability were improved.The telescopic tubes were lifted up by chain and come down regularly because of gravity.With a smal-ler outer diameter,it achieved large stroke,high load,the expansion length ratio reached 5∶1.At last,mechanical model was established and load distribution among rollers was studied based on Hertz theory and finite element simulation to ensure their useful life,experi-mental verification was conducted.The results demonstrate that life of the telescopic tubes meets the requirements.This structure has been widely applied in practical projects.
telescopic tubes for hot cell manipulatorsadjustable roller bearingload distributiongravity driven descent
NETL
NSTL
万方数据
