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There are two kinds of silos flour silo and grain silo according to the storing-material. - details see: https://www.machineto.com/steel-grain-silo-10191042

The flour silo stores flour material and inside of silo is smooth. The unit capacity is 20T to 200T. The grain silo stores wheat, maize, bean and so on. The unit capacity of grain silo is 200T to 10000T.

Steel silo use hot galvanizing steel sheet to make the silo body.

There are two base of silos, cone or flat.

Steel cone base: when the silo capacity is below 800T and the diameter is below 8.5m, silo base can make into steel cone base. Steel cone base is composed of upright columns, annular girder, cone plates, tie pieces etc., the upright columns are made of national standard NO.1 shaped steels. The NO.1 shaped steel is one of the most widely used steel types in steel structure design and manufacturing. Annular girder is shaped by channel steel and it has the function of supporting silo body, connection columns and silo base plates.

1. Cement cone/flat base: when the silo capacity is comparatively big and its diameter is below 12m, its base is generally made into cement cone base. Cement cone base is an inverted cone hopper cast into frame with the cone base height is too big, its base generally made into half-cone base or flat cone base. Half cone base can’t completely unload the stuff. Flat base steel silo needs to unload stuff at multi-parts or equipped with a spiral silo cleaner.
2. Cement cone/flat base: when the silo capacity is comparatively big and its diameter is below 12m, its base is generally made into cement cone base. Cement cone base is an inverted cone hopper cast into frame with the cone base height is too big, its base generally made into half-cone base or flat cone base. Half cone base can’t completely unload the stuff. Flat base steel silo needs to unload stuff at multi-parts or equipped with a spiral silo cleaner.