(1) The upper and lower sectors of the stone mill have regular grooves, which are deep in the middle and shallow outside, leaving a certain gap in the middle.

When the beans go down inside, they first enter the gap in the middle part according to the engraved chute channel. With the rotation of the upper stone mill, the gaps become smaller and smaller, and finally they become powder.

(2) Physical principle: it is a lever principle and a labor-saving lever. The stone mill mainly grinds what is put in through the lever to drive the grinding disc to rotate.

2. Stone mill exploded view

Stone mill type

1, traditional chip stone mill

1968, a stone mill about 2 100 years ago was unearthed from Mancheng Han Tomb in Baoding City, Hebei Province. It is a copper-stone compound mill consisting of a stone mill and a copper funnel. This is the earliest stone mill discovered in China so far.

2. Modern stone mill

The modern chip stone mill retains the grinding part of the traditional stone mill, that is, two cylindrical rocks, and changes the traditional power generation device, from the original donkey to the motor, and adds a conveying device and a cleaning device. Compared with the traditional stone mill, the modern stone mill saves labor, reduces the amount of labor and improves the output of the stone mill.

The conveying device consists of a large hopper, a fan, an air door, a funnel and a pipeline. The cleaning device consists of a screen, a brush and a round roller.

Refer to the above? Baidu encyclopedia-stone mill