What is the meaning of stone mill?

Stone mill niǎn, is a kind of stone and wood and so on made to make grain and so on broken or peeled with the tool, by the milling disk (milling platform), milling weight (milling roller, milling threshing floor), milling frame, milling tube core, milling stick holes, milling sticks and so on composition.

The stone mill is divided into two parts, the upper part is called the mill, the lower part is called the mill. Grinders and grinders on the contact surface, burin (zàn) has a neatly arranged middle deep two shallow grind teeth, and grinders burin (zàn) has a neatly arranged side of the deep side of the shallow grind teeth, used to grind grain. The mill was fixed on the mill frame (the deep end of the teeth was in the center), and the mill frame was made of hardwood (usually jujube wood) in a quadrilateral shape. In the center of the two ends of the grinding stone there are two small round pits concave inward, in which a small iron bowl is fixed, called the mill umbilical cord; in the corresponding position of the mill frame there are two round iron rods fixed in the opposite position of the mill umbilical cord, the concave and convex together, and it can be rotated freely. One end of the mill frame, there is a hole in the center, set on the mill pipe core, and mill pipe core is fixed in the center of the mill plate is a metal cylinder. Mill frame is generally also chiseled two mill stick hole.