Above and beyond: Lyn Bates of Ajax Equipment discusses the benefits and drawbacks of a method of elevation that extends the scope of screw elevators beyond the normal range of application

摘要

Until recently process engineers had only three modes of transport available to move loose solids and bulk materials by means of helical screws. These were by gravity mode, as widely employed in screw type conveyors, the flood feed form used in screw feeders, and a dynamic mode that operated within screw elevators. Inevitably there are limitations to each of these methods. Process engineers now have an additional tool for elevating solids, an elevating method that uses a static screw, where the bulk material is moved around the inclined face of the screw flight by the effect of a rotating casing. It works amazingly well. This new method of elevation has many operating advantages that extend the scope of screw elevators beyond the normal range of application of traditional equipment.