Patent ID: 7900511
Filing Date: 2011-03-08
Classification: B23B,G01M

Abstract:
1. A locking device for a maintenance machine of a rotating body, having a fixed portion comprising a hollow fixed support element borne by the maintenance machine, and a control system, and a movable portion comprising a bell-shaped member with flange mounted for rotation coaxial to said hollow support element and designed to support said rotating body, and holding or locking means arranged to removably fix said rotating body against said flange of said bell-shaped member, driving means suitable for driving, upon control, said movable portion in rotation, the locking device further comprising: an axial piston rod member slidably mounted in an axial shank portion of said bell-shaped member and having one inner end secured to said piston element and its other end overhangingly extending in axial alignment with said bell-shaped member; valve means borne by said piston element and designed to control at least one fluid passage through it; a rigid tubular element slidingly mounted within said hollow fixed support element and having one end thereof in fluid communication with said work chamber and arranged to control said valve means of said piston element, and its other end blind, thereby delimiting an inner opening in fluid communication with said control system; and a linear actuator arranged to make said tubular element axially slide in said hollow support element upon control of said control system; wherein said movable portion comprises a sleeve element, which is operatively connected with said driving means, mounted for rotation on said fixed support element and has one of its ends extending overhanging beyond said fixed support and coaxially supporting at its head said bell-shaped member, thereby delimiting a work chamber with said bell-shaped member; a piston element slidably mounted in said work chamber and designed to control said holding means, and said fixed portion comprising pressurized fluid supply means suitable for loading, upon control of said control system, said work chamber with pressurized fluid, and for moving away from said movable portion before said movable portion is set in rotation by said driving means, and discharge means for discharging, upon control, said work chamber once the rotation of said movable part has terminated.