1. Classification by impact: light and heavy.

2. Classification by length: (1)

Short rolling mill

When the aspect ratio is lower than 2, it is short grinding or ball mill. Generally, a single bin is used for rough grinding or initial grinding, and 2-3 ball mills can also be used in series.

Medium and long mill

When the aspect ratio is about 3, it is a medium-long mill.

(3)

Long rolling mill

When the aspect ratio is greater than 4, it is a long mill or a tube mill. Medium and long mills are generally divided into 2-4 silos, which are widely used in cement plants. three

Depending on the shape of the grinding medium.

( 1)

ball mill

The grinding medium filled in the mill is mainly steel balls or steel segments. This kind of mill is the most commonly used.

(2)

rod mill

A steel bar with a diameter of 50- 1 10 mm is put into a mill as a grinding medium. The ratio of length to diameter of rod mill is usually

1.5-2mm

(3)

Rod ball mill

This mill usually has 2-4 silos, the first silo is filled with cylindrical steel bars as grinding media, and the subsequent silos are filled with steel balls or steel segments. The length-diameter ratio of the bar ball mill should be about 5, the ratio of the length of the bar bin to the effective diameter of the mill should be between 1.2- 1.5, and the bar length is about 100mm shorter than that of the bar bin, so as to facilitate the parallel arrangement of steel bars and prevent cross-disorder. (4)

Pebble mill

The grinding media loaded in the mill are gravels, pebbles, porcelain balls, etc. Granite and porcelain are used as linings. Used to produce white or colored cement and ceramics. 4. Classification by unloading method (1)

Tail discharge mill

The material to be ground is fed from one end of the mill and discharged from the other end. This mill is called tail-unloading mill.

(2)

Intermediate discharge mill

The ground material is fed from both ends of the mill and discharged obliquely from the middle of the mill barrel. This mill is called a middle discharge mill. This mill is equivalent to using two ball mills in parallel, with compact equipment and simplified technology. (3)

Tail discharge mill

According to its layout, there are many types, such as grid layout, overflow layout, peripheral layout, wind layout and so on. 5. Classification by transmission mode

( 1)

Central drive mill

The motor drives the hollow shaft at the discharge end of the mill through the reducer to drive the mill to rotate. The output shaft of the reducer is in a straight line with the center line of the mill. (2)

Edge-driven grinder

The motor drives the big gear fixed on the cylinder at the discharge end through the reducer to drive the grinding cylinder to rotate. 6. Other classification: According to process operation, it can be divided into dry grinding, wet grinding, intermittent grinding and continuous grinding. Compared with intermittent mills, continuous mills have higher output, less power consumption per unit weight of products, higher degree of mechanization and fewer operators. However, the capital construction investment cost is high and the operation and maintenance are complicated. At present, intermittent mills are rarely used, and they are often used as laboratory test mills. This information is provided by.

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