Luban Luban, the inventor of stone mill, was an excellent creative inventor in ancient China. He lived in the late Spring and Autumn Period and was called Gonglei. Because he is from Lu, he is also called Lu Ban. It is said that he invented saws, planers and rulers for carpenters. He also used his wisdom to solve many problems in people's lives. When Luban lived, people wanted to eat rice flour and wheat flour. They put rice and wheat in a stone mortar and pounded them with a thick stone stick. This method is very laborious, and the powder is coarse and fine, and it is rare at a time. Luban wants to find a way to get twice the result with half the effort. Just use two flat cylindrical stones with a certain thickness to make a grinding fan. There is a short vertical shaft made of iron in the middle of the lower fan, and a corresponding empty sleeve in the middle of the upper fan. After the two fans are combined, the lower fan is fixed and the upper fan can rotate around the shaft. On the opposite sides of the two fans, there is an empty chamber called grinding chamber, and the periphery of the chamber is made into falling grinding teeth. There are grinding eyes on the upper fan. When grinding, the grains flow into the grinding chamber through the grinding eyes, are evenly distributed around, are ground into powder, flow from the cracks to the grinding disc, and are removed by a Luo sieve to obtain flour.

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