Internal screening roller type vertical mill

Abstract

The invention relates to material grinding equipment used in the field of cement production, in particular to an internal screening roll-type vertical mill, comprising a millstone and a grinding roller. The external edges of the millstone are connected with a classification screen. The millstone and the classification screen are covered by two layers of cylinders: an internal cylinder inside and an external cylinder outside. A fine powder cavity is arranged between the classification screen and the internal cylinder. Screen pores of the classification screen are communicated with the fine powder cavity. The outside of the fine powder cavity is communicated with a plurality of fine powder channels distributed on the circumference of the internal cylinder. The fine powder channels pass through an interlayer between the internal cylinder and the external cylinder and extend out from the external cylinder and enter a fine powder outlet. The upper edge of the classification screen is provided with an upper plane. The upper plane extends into the upper end of the interlayer between the internal cylinder and the external cylinder. A crude powder slide carriage is arranged in the interlayer, a lower end of the crude powder slide carriage is led to a crude powder outlet. The material grinding equipment not only assures grinding quality but also avoids energy waste and equipment vibration caused by repeated powder grinding, simplifies the grinding technique and prolongs the service life of the wear parts.

Description

technical field [0001] The invention relates to a material grinding equipment used in cement production, metallurgy, electric power and other industries, in particular to an internal screening roller type vertical mill. Background technique [0002] The grinding of materials is a necessary process in the raw material processing process of many industries. For example, the cement grinding process is an important link in the cement production process. It is not only related to the quality of cement, but also has an impact on the output of cement and the energy consumption of production. important influence. While striving to increase the output of cement grinding equipment and the fineness of cement, it is of great practical significance to minimize the energy consumption of the grinding system for saving energy and improving the economic benefits of enterprises. [0003] Among the existing grinding equipment, roller vertical mill is a kind of equipment used more, its structu...

AI Technical Summary

Problems solved by technology

This type of structure has the following defects: 1. The material discharge method is forced to be discharged by the scraper, which consumes a lot of energy and the scraper is seriously worn; 2. The wear parts such as the grinding disc liner have a short service life; 3. In order to ensure the grinding effect, Usually, the materials discharged after grinding are partially circulated into the mill for repeated grinding. Although this can improve the quality of the powder, but because some qualified fine powder is also brought into the mill during circulating grinding, repeated grinding, waste reduces power consumption, and is prone to vibration due to the presence of fine powder

Images