TD is a fixed elevator categorized as feeding device of delivering powdery and granular materials upward vertically. It adopts towing strap of transmission to drive the hopper to move and feeding is performed from the lower to the upper accordingly.

 Bucket elevator discharges materials centrifugally and feeds with them by draw-take out. Large quantity of feeding can be obtained through small distances of bucket. It embodies merits of a small occupational area, high efficiency of feeding, simple operation, convenience of installation and multipurpose applications. It applies to the manufacture of non-abrasive powdery and granular materials and especially in the industries of dry mortar for construction, chemistry and foodstuff.