H4-DV-24-D Mounting position Horizontal HHVertical HVHigh sp Helical gear boxes H4

Flender/Flender Gear Units/Helical gear boxes H4

ing frequent cleaning. Most continuous-ow dryers are of the stationary type, although some of the smaller- sized dryers are portable. For example, Gilmore and Tatge Manufacturing Company, Inc.(Clay Center, KS) make concentric cylinder-type portable dryer that handles 7.8 ton/ (3 bu/) based on moisture removal from 2.5 to 1.5%. Grain column width on many of these dryers is 0.3 as compared to the 0.4 found on the GT-Tox--Wik recirculat-ing batch dryers. Note that the moisture differential across the grain column is loweredas its width is decreased. thinner column, therefore, means that, for given averagemoisture content, the inner layer is overdried less. Thus, using continuous-ow dryermight be of some benet when drying heat-sensitive small grains, such as wheat, oats, and barley. Another type of continuous-ow dryer is the parallel-ow dryer in which the grain moves in the same direction as the hot airow. This results in more uniform drying andreduces the danger of heat damage. Furthermore, because no screens are used in parallel-ow dryers, small seed crops can be dried without leakage. Continuous-ow dryers are not well suited for the drying of small quantities of different types of grain because start-up and emptying of these dryers is inefcient. Accu- rate moisture control is difcult to achieve until uniform ow is established. Continuous- ow dryers are best in situations in which large quantities of grain must be dried withoutfrequent changes from one type to another. 3.2 Rotary Dryers Rotary dryers are now employed in the grain industry to limited extent. The major components of the system are long, inclined cylindrical shell, fan and heater unit,loading and unloading augers, and variable-speed drive. The operating principle of thistype of dryer is to repeatedly lift the grain using set of ights along the perimeter ofthe cylindrical shell and drop them into stream of heated air. Most rotary grain dryersare of the concurrent-ow type in which grain and he