OScrew conveyors are of two main types, TLSS trough screw conveyor and T WLL tubular screw conveyor,both of which are characteristic of simple structure, small cross- -sectional area, good seal performandce,easy operation, convenient maintenance, etc and spe-cially efficient for handling powdery, granular and small materials with poor fluidity and without the sensitivity of broken, such as rice husk, rice bran and tempered wheat.

OTLSS trough screw conveyor is mainly used as acollecting or distributing conveyor. Proportioning anddischarge of materials, especailly accurate feeding are among the main uses for TWLL tubular screw convey-or. Due to better seal performandce, TWLL tubular screw conveyor can meet higher sanitation require-ments.