Hollow shaft with spline according to DIN Types H B4CV-9-C Bevel-helical speed reducer B4

Flender/Flender Gear Units/Bevel-helical speed reducer B4

the perforated bin oor where it is picked up by vertical auger and deliveredto grain spreader. When the dryer is operated as continuous-ow dryer, the graintraveling up the vertical auger is transferred to an aeration bin by an inclined auger. 3.1.3 Continuous-Flow Dryers Of the many types of continuous-ow dryers, the cross-ow dryer is the most commonly used for grain drying (Fig. . The grain is loaded at the top and passed down both sides of the hot and cold plenums before entering the unloading augers. Grain ow rate is controlled manually or by thermostat near the outside of the grain column. As fan capacity is decreased or column width increased, more efcient use of heat results; however, the moisture differen-tial between grain on the inside and outside layers increases. Fig. 4 Recirculating bin dryer. Commercial Grain Dryers 1 Fig. 5 Cross-ow dryer. Some continuous-ow dryers use three fans and three plenums, each with individual temperature controls. These may be run with two heating sections and one cooling section,or with three heating sections. In the latter case the grain must be cooled in an aeratedbin (see Figs. 6a, 6b). Farm Fans (Indianapolis, IN) has series of dryers of this type that they term contin- uous multistage dryers, ranging in capacity from about 5 to 2 ton/ (2 bu/) based on drying and cooling corn from 2 to 1% moisture. Several companies recycle drying or cooling air. Two common techniques of ac- complishing this are shown in Fig. 6. Some manufacturers use the system shown in Fig.6a. Here, ambient temperature air is drawn through the grain in the cooling section and then passed through the fan heater unit of the midsection. This system results in more energy saving than the system shown in Fig. 6b because air from the rst heating section Fig. 6 Heat recovery systems: () reverse cooling; () one-way airow. 1 Raghavan is recycled. Its disadvantage is that chaff and ne material may be drawn into the midsec- tion hot air plenum, necessitat