SYSTEM OF SLIDING FLOORS AND SLIDING WALLS USED FOR LOAD PLATFORMS ON ROAD SEMI-TRAILERS FOR HORIZONTAL UNLOADING IN STAGES

System of sliding floors and sliding walls, applied to loading platforms of road semi-trailers for horizontal unloading in stages, which is mounted within a loading platform (1) attached to road semi-trailers (2), and wherein this loading platform (1) has a rear side wall (11), comprising a first sliding floor (10) mounted at the base of the loading platform (1), a second sliding floor (20) mounted on the first sliding floor (10), a vertical sliding wall (30) mounted on the second sliding floor (20). The first floor (10) performs "stage 1" of the displacement, displacing and carrying along the second floor (20) and the sliding wall (30). After the displacement of the first floor (10), the second floor (20) displaces over the first floor (10), performing "stage 2" of the displacement, carrying along the sliding wall (30) mounted on it. After the displacement of the second floor (20), the displacement of the sliding wall (30) is then actuated, performing "stage 3" of the unloading, whereby it displaces over the second floor (20) to the outermost end of the loading platform (1), as close as possible to the rear side wall (11).