Helical speed reduction gearbox H3 flender gearbox drawings H3-VV-21-D

Flender/Flender Gear Units/Helical speed reduction gearbox H3

ctric heating, hot air, uidized bed, or infrared. Among the systems studied so far,only the uidized bed heating has been developed to commercial prototype level (.Apart from uidized bed, dielectric heating is promising, as it can selectively act on in-sects. major impediment for heat disinfestation is the capital cost. However, among thephysical methods, heat disinfestation technique offers promise to into modern grain storage (. In temperate countries during summer and in tropical climatic regions in any season, grain chilling or grain aeration with refrigerated air is carried out. Ambient air is passedthrough refrigerated coils to reduce its temperature and the cooled air is reheated slightlyto reduce the humidity to 6%. Chilled air is blown through the grain to bring downthe temperature to prevent spoilage and pest activity. mobile refrigeration system that can control the temperature as well as the humidity of the aeration air is used. Currently, grain chilling is used for wheat, maize, and rice, and there are about seven commercial manufacturers (the majority in Europe) of mobile grain chillers in the world (. Unlikeambient air aeration, grain cooling by refrigerated air requires only few days of treatment,but it is relatively more expensive. Normal aeration is dependent on the presence of coldambient air, whereas chilled aeration can be carried out at any time, and both temperatureand humidity of the air going inside the bin can be adjusted. Grain chilling must be re- peated at intervals, otherwise grain temperature may increase shortly after chilling. At low temperatures the degradation of insecticides is less. Therefore, the amount of pesti-cides used and the level of pesticide residues formed are reduced considerably in grainaerated with refrigerated air. This is an important advantage of chilled aeration (. 4.1.7 Irradiation Ionizing radiation for insect control in stored grains has been studied since the 1s. Most investigations have focused o