14/5/2014 · In China, at Huanghua coal export terminal, six twin rotary tipplers have been installed to achieve export of 80 million tons of coal per year. Yashwant Sakhardande Each tippler at this port simultaneously unloads two rail freight box type wagons, each weighing a maximum 98 tons, at a rate of up to 33 cycles per hour, thus unloading an average 4,000 tons of coal per hour with a maximum