QHC-450 full section bed ballast replacement machine is a kind of assorted machinery for railway overhaul and medium repair. It is controlled by hydraulic fluid, with characteristics of convenient and comfortable operation, low cost for maintenance and good reliability. It can work with the material conveyor truck to dig out the dirt and ballast without the removal of track skeletons and then cast them to either side of the track or to the material conveyor truck through the rotary casting belt at an angle of ±45° (railway median) so as to complete ballast replacement. It can meet the casting requirements of different railways.