The PIZETA loading box is used to supply production lines with granular products such as semolina, flour and other cereals by loading sacks of these products manually into the hopper. It consists of one or two diaphragm hoppers, depending on the number of raw materials to load, and extracting screw feeders in the bottom that dispense the product. The screw feeder rotation is driven by a motor reducer controlled by an inverter to guarantee the variation in capacity required by the client. The screw feeder also has a safety system to prevent blockages in the unloading outlet. This prevents damage to the machine in the case of a malfunction.