A frame (1, 101, 201) supports a conveyor belt system with a longitudinally circulating conveyor belt. Two plate-like carrier elements (2, 102), with principal planes extending at right angles to the longitudinal direction (L) are joined by at least two distance elements (4, 4′), disposed parallel to the longitudinal direction (L). The distance elements space the two carrier elements apart. A plurality of support elements (5) and machine feet (21) support the frame on the ground. At least one of the carrier elements defines a seating area (3), which is largely arranged horizontally. At least two first mechanical interface elements (6) run parallel to the distance elements, preferably extending over the carrier elements, and are fixed on the seating areas of the carrier elements. The frame also has at least two fixing elements (7), by which the first mechanical interface elements (6) are fixed to the seating areas.