Vertical sand mill and sand making method

Abstract

The invention provides a vertical sand mill. The vertical sand mill comprises a conical rotating disc with a vertical center and a plurality of grinding disc rollers mounted above the conical rotating disc, a gap exists between the grinding disc rollers and the conical rotating disc, the vertical sand mill further comprises a sand milling outer cover mounted on the peripheries of the conical rotating disc and the grinding disc rollers, and a grinding cavity is formed between the sand milling outer cover and the conical rotating disc; and the edge of the conical rotating disc is tooth-shaped and is matched with a peripheral wear-resistant ring. According to the sand mill and a sand making method, through the conical rotating disc, the passing capacity is increased, and the grinding times are reduced; materials are ground multiple times through the grinding disc rollers; and through extrusion and crushing of the edge tooth shape of the conical rotating disc and the wear-resisting ring, the passing capacity of the sand mill is improved, the crushing ratio is increased, the grain shape is optimized, and the powder amount is reduced.

Description

technical field [0001] The invention belongs to the technical field of crushing machinery and relates to a vertical sand mill. Background technique [0002] There are many ways to process crushed rock into sand less than 5 mm, and the main principles are impact crushing, extrusion crushing, and abrasive crushing. Impact crushing accelerates the stone through the rotor to a high speed of 60 m / s or more, and the stone collides with the stone lining or iron wall and crushes; extrusion crushing uses extrusion equipment to apply pressure to the stone, thereby causing crushing. The former includes vertical shaft impact crushers, the latter has roll crushers, and the latter includes ball mills, rod mills, and vertical mills. [0003] The vertical shaft impact crusher includes a frame, a motor, a motor frame, an upper feeding hopper, a sub-hopper, a rotor, a middle part, a middle cavity, a main shaft assembly, a pulley assembly, a lower part, etc. The frame is used to bear the wei...

AI Technical Summary

Problems solved by technology

Such as CN102962115B, the non-grinding area in the middle of the grinding disc is conical, which is conducive to spreading the material. The grinding area is arc-shaped, and the arc-shaped grinding area forms an annular roller table. The material stays on the annular roller table for a long time, which is much more convenient. Secondary roller pressing, but it affects the material passing, and the output is low

The traditional grinding disc and grinding roller grinding and crushing machinery need an external screen to control the particle size, such as CN100588462C, which uses a grading screen on the periphery of the grinding disc to separate the coarse and fine, which has a large area and the screen is easy to be blocked and fails. Traditionally, the air flow is used to drive the powder. , it is difficult to bring up the coarse particles, they will accumulate on the outer periphery of the grinding disc, and it is difficult to return to the roller table for grinding

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