Bevel-helical speed reduction gearbox B2 Thermal capacities n rpm Flender GmbH Flender B2-CV7-B

Flender/Flender Gear Units/Bevel-helical speed reduction gearbox B2

Meritsand drawbacks of various traditional storages have been discussed (. At farm level,metal bins or silos of various sizes have also been used (. In countries such as Australia Grain Storage: Perspectives and Problems 1 and the United States, the bin capacity exceeds 5 metric ton and is also equipped with facilities for aeration. 2.2 Bagged Storage In developed countries, grains are stored in bulk in silos, at storages, and in grain eleva- tors, whereas in the developing countries, they are generally, stored in gunny or wovenpolypropylene bags in the conventional warehouses (8,. Bag storage is labor-intensiveand thus incurs higher operating costs and losses to pests, and results in more spillage.In some of the warehouses, if the ooring is not properly constructed, water seepageoccurs. This increases the humidity in the warehouse, favoring multiplication of Crypt- olestes spp.; also, it damages the bottom layer of bags. The advantages of bagged storage system are the lower capital costs without any need for sophisticated aeration and fumigantcirculation facilities. However, much less research has focused on the possible loss reduc-tion in bag storage systems in the developing countries (. The existing system maycontinue in these countries because of small farm sizes, handling of many grain varieties,and cheaper manual labor. Moreover, it will be uneconomical to change over to capitalintensive bulk storage system. 2.3 Bulk Storage The system of bulk handling and storage in silos or bins and elevators has been adopted by the industrialized countries as result of mechanized harvesting and postharvest opera-tions. Bins and silos of varying capacities, built of masonry, wood, reinforced concrete, or metal, with hopper or at bottom are the modern grain storage structures in the developed nations. In hoppered bins grains ow out by gravity; hence, they are self-clean-ing and do not require shoveling. Flat-bottomed bins are cheaper to construct and providemore