Pre-powder roller mill with automatic powder selection and automatic powder selection method for pre-powder roller mill

Abstract

The invention discloses a pre-powder roller mill with automatic powder selection and an automatic powder selection method for the pre-powder roller mill. Materials fall into the middle of the grinding disc through a feeding chute, and are rolled by the grinding disc and the grinding roller. After the zone, the material falls on the air ring through the baffle plate on the edge of the grinding table under the action of centrifugal force. Powder device, the coarse particles with a particle size greater than 0.3mm fall into the air duct, and are scraped by the scraper to the discharge port to be discharged from the mill. Coarse particles with a particle size of 50 μm to 0.3 mm selected by the powder device are discharged from the mill through the inner cone bucket discharge chute, and then enter the final grinding machine for grinding. The invention can screen materials with different particles in the mill, does not need additional powder selection equipment, simplifies the process, reduces maintenance costs, and reduces the unit energy consumption of the production line by more than 15-20% compared with the roller press.

Description

Technical field: [0001] The invention relates to a milling equipment used in cement building materials, coal, steel, thermal power generation and other industries, in particular to a pre-powder roller mill with automatic powder selection and an automatic powder selection method for the pre-powder roller mill. Background technique: [0002] At present, roller presses are usually used as pre-grinding in various grinding production lines. Compared with using roller presses as pre-grinding, there are many disadvantages. First, the particle size of the materials after roller press grinding It cannot be screened inside the mill, but it is screened by other screening equipment outside the mill, which will cause waste of electricity and manpower, and reduce the efficiency of the entire production line. Second, the roller press works at a very high specific pressure, resulting in a wear-resistant roller surface that needs to be repaired after only about 3000 hours of service life. Th...

AI Technical Summary

Problems solved by technology

[0002] At present, roller presses are usually used as pre-grinding in various grinding production lines. Compared with using roller presses as pre-grinding, there are many disadvantages. First, the particle size of the materials after roller press grinding Screening cannot be carried out inside the mill, and it is all screened by other screening equipment outside the mill, which will cause waste of electricity and manpower, and reduce the efficiency of the entire production line

Second, the roller press works at a very high specific pressure, resulting in a wear-resistant roller surface that needs to be repaired after only about 3000 hours of service life. The maintenance cost is high, and the edge failure caused by material leakage on both sides reduces the grinding efficiency by 20-30%. , the increase in the circulation volume increases the unit energy consumption. In addition, the high specific pressure design makes it difficult to enlarge the roller press.

Images