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Use your smartphone to scan this QR code and download this article ABSTRACT Nowadays, screw conveyors have been used to transport bulk materials since historical times. They are composed of a helical flight (screw), a driving shaft connected to a driving device, a casing Utrough or pipe, and so on. The principle of conveyingmaterials relies on the friction betweenmaterials and the rotating screw or the casing. The advantages of screw conveyors are compact design, low maintenance, and the ability to transport materials continuously and safely. Screw conveyors have been used not only as bulk handling equipment to transportmaterials but also as parts of construction and mining machinery, e.g., underground tunneling machines, in which they are used to discharge soil or rock continuously. As volumetric devices, screw conveyor generally provide relatively precise throughput controlwhilemeeting other requirements, e.g. environmental protection. A screw feeder typically consists of a storage container (bin or hopper) coupled to a screw casing and a screw within. They are suitable for conveying dry material or grain. Although mechanical structure of screw conveyor seems very simple, mechanic of transport action is very complicated. The periodic boundary, inclination, speed of rotation, radial clearance etc. influence productivity, mass flow rate. Following theoretical studies, the radial clearance should be very small, however, in reality, the bulk material cannot go through the clearance, that makes the screw stuck and then stop. However, when the radial clearance is larger, productivity decreases very fast. In this paper, the cement is transported by screw conveyor. The experiment is done with different parameters such as speed of rotation and the radial clearance. The productivity is recorded with each change of parameters. The result from the experiment will predict the best radial clearance to transport the cement. The paper will conclude the area having high productivity and low productivity.

Study on the radial clearance of the screw conveyor for transporting cement