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What's so particular about the stone mill?

The people regard the stone mill as a "dragon", and the stone mill on the grain field is absolutely not allowed to sit. Sitting on a stone table is a "green dragon head", which will definitely offend the gods and be detrimental to the summer harvest. There is also a saying that "sit on a stone, rot your crotch and eat less food." "rotten crotch" is a punishment for people sitting on stones; "Less grains" is a punishment for those who use this kind of stone.

Stone mill introduction:

Stone mill is a machine used to process rice, wheat, beans and other grains into powder and pulp. It began to use human or animal power, and in the Jin Dynasty, the working people in China invented the waterwheel powered by water. Usually made of two round stones. The grinding surface is two layers flat, and the junction of the two layers is textured. Particles enter the middle of the two layers from the upper hole, move outward along the grain, and are ground to form powder when rolling through the two layers.

Extended data:

Mill, originally called Wei, was called Mill in Han Dynasty.

The development of China stone mill can be divided into three periods: early, middle and late.

From the Warring States to the Western Han Dynasty, the grinding teeth in this period were mainly pits, including rectangles, circles, triangles and jujube pits. Their shapes are varied and extremely irregular.

From the Eastern Han Dynasty to the Three Kingdoms, it was a period of diversified development of grinding teeth, and the shape of grinding teeth was radial and diagonal, with four, six and eight belts.

The later period is from the Western Jin Dynasty to the Sui and Tang Dynasties (up to now). This period is the mature stage of stone grinding, and the mainstream of grinding teeth is eight-zone oblique line type and ten-zone oblique line type.

It is people, animals and water that grind.

The mill driven by water was invented in the Jin Dynasty. The power part of the waterwheel is a horizontal waterwheel. The upper fan of the mill is installed on the vertical shaft of the wheel, and the running water drives the mill to rotate. This kind of mill is suitable to be installed in the place where the water impact force is relatively large.

If the impact of water is relatively small, but the amount of water is relatively large, another form of water mill can be installed: the power machine is a vertical wheel, and a gear is installed on the axle, which is connected with the gear installed at the lower part of the grinding shaft. The rotation of the water wheel turns the mill through gears. These two kinds of water mills are relatively simple in structure and widely used.

When history developed to 1970s, people skillfully combined ancient technology with modern elements to create motor-driven stone mills, including two kinds of stone mills, chip stone mills and roller stone mills.

The grinding part of the chip mill is divided into a fixed part and a rotating part, forming a horizontal structure. The fixed part is a semi-cylindrical groove matched with the rotating part on the long side of the rectangular stone. The rotating part is made into a cylinder, and the middle hole penetrates into the transmission shaft. The surface of the contact area between the semicircular stone trough and the rotating cylinder is engraved with a pattern similar to that of the ancient stone mill, and the corresponding shielding transmission part forms a product of the combination of the old and the new.

The grinding part of the roller stone mill is roller cylindrical rock, which looks like the grinding roller of a steel mill, and the surface is engraved with patterns similar to those of ancient stone mills.

References:

Baidu encyclopedia-stone mill