They are made of pre-galvanized steel plate, with the almost complete removal of welding. The design parameters of these machineries have been worked out in order to fulfill the specific needs of the storage plants of medium/small size, with working cycles related to the harvesting of agricultural crops (usually wheat and corn, or similar products). It is a modular construction and machineries are supplied in standard pre-configured combinations (therefore, personalization is not available for the customer). A complete series of accessories has been developed for the supply, for unloading and for the working control. TCA chain conveyors guarantee very good performances, easy installations and maintenance, and reliability.