Iron removing device inside vertical mill

Abstract

The invention provides an iron removing device inside a vertical mill. The iron removing device inside the vertical mill comprises a vertical mill shell, and further comprises a rotary shaft, an electromagnetic device and an unloading device; the left end of the rotary shaft extends into the vertical mill shell, and the right end of the rotary shaft is connected with a drive mechanism; the electromagnetic device is obliquely arranged above a vertical mill abrasive disk and comprises an electromagnet and an abrasion-resisting board arranged on the outer side face of the electromagnet; the innerside face of the electromagnet is fixedly connected with the rotary shaft through a support ribbed plate; the adsorption face of the abrasion-resisting board is an inward concaved curved face; the unloading device is a discharging scraper-trough conveyer; the feeding end of the discharging scraper-trough conveyer is located inside the vertical mill shell and corresponds to the unloading end of the abrasion-resisting board; and the discharging end of the discharging scraper-trough conveyer is located outside the vertical mill shell. The iron removing device inside the vertical mill can separate and remove iron materials released by polishing large materials in time, so that damage to a vertical mill material bed and abrasion-resisting materials is greatly reduced.

Description

technical field [0001] The invention relates to a vertical mill grinding system, in particular to an internal iron removal device for a vertical mill. Background technique [0002] In the field of grinding, material bed grinding is favored by the majority of users due to its remarkable energy-saving effect. Especially in the cement industry, vertical mill grinding systems are widely used in the three major grinding systems of raw material preparation, grinding preparation and cement preparation. , so as to gradually replace the ball mill with low grinding efficiency, and the "ballless" grinding technology has become the future grinding trend in the cement industry. Although vertical mills have many advantages, they have stricter requirements on material particle size and impurities. In actual production, the particle size of materials can be controlled by screening, but impurities are not easy to control, especially metal foreign matter impurities. Metal detectors and iron...

AI Technical Summary

Problems solved by technology

In actual production, the particle size of materials can be controlled by sieving, but impurities are not easy to control, especially metal foreign matter impurities

Metal detectors and iron removers have become necessary supporting devices for vertical mill grinding systems. Generally, iron removers are installed above the material conveying belt conveyor and on the material conveying chute. However, due to the thick material on the belt conveyor and some iron-containing substances contained in the In bulk materials, it is difficult for the iron remover to completely remove the iron-containing substances, and the flow speed of the material in the chute is relatively fast, so the iron removal effect of the iron remover is limited

[0003] In order to improve the effect of iron removal, at present, multiple iron removers are often installed in the vertical mill grinding system, that is, iron removers are installed before the vertical mill enters the mill and after the mill is discharged. The iron remover is installed before the vertical mill to prevent iron-containing substances from entering the vertical It is good for the stability of the vertical abrasive bed and the protection of the internal wear-resistant material. The iron remover is installed after the vertical mill is milled to remove as much as possible the iron-containing substances that are contained in the bulk material and that have not been removed before grinding. The iron-containing substances removed by ironware are removed to prevent these iron-containing substances from circulating and enriching in the system, which will repeatedly affect the stability of the vertical abrasive bed and damage the wear-resistant material

However, the iron materials contained in the bulk materials are difficult to be detected and separated before entering the vertical mill. The iron materials can only be released after the large materials are rolled in the mill. These iron materials are removed before being discharged from the vertical mill. The grinding roller has a high probability of re-grinding, especially for the internal circulation vertical mill integrating drying, grinding and powder selection. Iron materials will be enriched in the mill, which is very important for the stability of the material bed and the life of the wear-resistant material. unfavorable

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