... Hot-dipped galvanized material,durability is 15-20 years,never go rusting. 2.one house one gantry feeding system.full automation ... system1.Hot-dipped galvanized material, durability is15-20 years,never go rusting. 2.one row one independent trolley feeding machine,controled ... dipped galvanized scraper blade. durability is 15-20 years,never go rusting.3.the conveyer belt transports manure directly to the ...