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## The main process parameters of the roller press

Roller press is a widely used grinding equipment, also known as high-pressure roller mill. The reasonable determination of the process parameters is the guarantee for the normal and high efficiency of the roller press. The following describes in detail how to determine the main process parameters of the roller press.

### Roll pressure

The large roller pressure Pmax between the rollers is proportional to the unit pressure p of the roller press, namely: Pmax=p/(αC), where p is the unit pressure of the roller press (N/m2), a is the clamp angle, and C is the material compression Characteristic coefficient, C=0.180.22. Because Pmax=1/(αC)=4060, the large roller pressure Pmax can reach about 50 times the unit pressure p of the roller.

### Roller linear speed

For a given material, the output increases in proportion to the line speed at the beginning. Too high line speed will cause the output to decrease. There is an upper speed limit. If the upper limit is exceeded, the equipment will run unstable. The smaller the feed size, the better the fluidity of the material and the higher the line speed. The choice of large linear speed depends on the required product fineness. If the output is constant, the higher the linear speed, the smaller the mill size. Generally, the linear velocity of the roller surface is 0.5~0.2m/s, and the height can reach 3m/s.

### Unit energy consumption

When installed in front of the tube (ball) mill as the pre-grinding equipment, the unit power consumption is 25kW·h/t; if the tube (ball) mill is used as the pre-grinding equipment, it is 511kW·h/t, so it is more than The tube (ball) mill can save electricity by 10% and 20%, and at the same time can increase the output of the fine grinding machine by 15% and 30%.

### Driving power

The driving power of the roller press can be calculated by the following formula: N=2βDLV1=2βV1. Where β is the angle of action of roller pressure, β α can be determined by the measurement structure of roller pressure and driving torque, generally replaced by approximate terms; V1 is the nominal volume output of the roller press, and its theoretical value is V1=vLD, m/3h; v is the surface linear velocity of the roller (m/s).

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