FIELD: mechanical engineering. SUBSTANCE: tray consists of a concave inclined bottom made in the form of a steel flexible strip placed between two opposite side walls fixed to the base connected to each other by cylindrical rods. The walls have through vertical grooves, the ends of the rods are installed in the grooves and can be secured; in the base under each rod there is a threaded hole in which a vertical screw is placed, the end of which is hingedly connected to the rod located above it. The tape is configured to interact with the rods. Between the tape and the first wall, vertical rectangular plates are installed on rods capable of contact with the side surfaces, and between the tape and the second wall there are similar plates installed in the same way. EFFECT: high accuracy of adjustment of the longitudinal profile of the bottom of the tray, which is a curve of rapid descent, is ensured. 1 cl, 3 dwg.