Double-layer internal screening device

Abstract

The invention relates to a double-layer internal screening device of a vertical pregrinding roller mill, which comprises an upper screening device, a lower screening device, a crude material annular groove, a fine powder annular groove, a material scraping device 1, a material scraping device 2, a crude material discharge port, a fine powder discharge port, and an eccentric sheave knocker. The device is characterized in that the upper screening device comprises a screen rack, a screen mesh, a static ring, and a mobile ring; the screen rack, the screen mesh, and the static ring are fixed on an upper housing, and the mobile ring is fixed on a millstone; the lower screening device comprises a screen rack, a screen mesh, and a boss, and the fine powder annular groove is fixed on a lower housing; the material scraping device 1 is fixed at the waist part of the millstone; the material scraping device 2 is fixed at the bottom part of the millstone; the crude material discharge port is located above the fine powder discharge port, and is staggered with the fine powder discharge port so as to facilitate the respective discharge of the screened crude materials and fine powder into a material collecting device outside the device. When the double-layer internal screening device is disposed in a vertical pregrinding roller mill, multi-grade classification of materials can be realized; the material grading capability is greatly improved; the structure of the vertical pregrinding roller mill is more compact; subsequent technology system is simple; the land occupation, basic construction investment and auxiliary equipment quantity for the vertical pregrinding roller mill are reduced; and thus the grinding capability and grinding efficiency are increased.

Description

Technical field: [0001] The invention belongs to a screening device, which is mainly used in cement, chemical industry, metallurgy and other industries, and particularly relates to a double-layer internal screening device of a vertical pre-powder roller mill. Background technique: [0002] The internal screening device is one of the core components of the vertical pre-powder roller mill used in the pre-grinding equipment. It is mainly to effectively classify the materials after the vertical pre-powder roller mill, so as to control the fineness of the output. Increase the output of subsequent grinding equipment and reduce the power consumption of the system. [0003] In the existing vertical pre-powder roller mill, a screening device is designed inside. There are still materials larger than 3mm in the fine material after being classified by the internal screening device. After screening by the external screening device, the material smaller than 3mm enters the Subsequent bal...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that there are still materials larger than 3mm in the fine material after the classification of the internal screening device of the vertical pre-powder roller mill in the existing one internal screening device, the present invention provides a dual-purpose vertical pre-powder roller mill. In-layer screening device realizes multi-level classification of materials and greatly improves material classification ability

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