Material grinding system

Abstract

The invention relates to the field of material grinding systems, in particular to a vertical mill grinding system used for preparing raw materials or concrete. The vertical mill grinding system comprises a feeding device, a vertical mill, an efficient separator, a ground material conveying device, an iron removal device, an elevator, a material distributing device, a rotoclone collector, a circulating fan, a dust collector, an exhaust fan and a chimney. According to the vertical mill grinding system, the efficient separator and the vertical mill are of an integrated structure, and the system has the advantages of being reasonable in structural style and compact in arrangement; the efficient separator is provided with an upper material scattering device and a lower material scattering device, materials can enter the upper material scattering device and the lower material scattering device for material scattering and dispersing, material concentration of the upper region of the separator can be lowered, and the separation efficiency can be improved. In addition, the efficient separator integrates material drying, material roughing classification and material concentration classification functions, so that the equipment investment is reduced, and the burdens of enterprises are lowered.

Description

technical field [0001] The invention relates to the field of a material grinding system, in particular to a vertical mill grinding system for preparing raw materials or cement. Background technique [0002] In the production of the cement industry, the grinding process is the process that consumes the most energy. Under the fierce market competition and the urgent energy-saving pressure, the continuous innovation and development of grinding energy-saving technology and energy-saving measures are promoted. In the grinding process of materials in the cement industry, the grinding technology of roller mills, especially vertical mills, has been gradually improved and rapidly promoted. It occupies a small area, has low civil construction costs, low noise, low wear, long life, and easy operation. And other advantages make it have a relatively broad application prospect, but from the actual effect of most of the vertical mill grinding systems that have been used so far, the vertica...

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Problems solved by technology

[0003] First, a high-speed airflow nozzle ring is installed inside the traditional vertical mill. After the airflow passes through the nozzle ring, the wind speed is too high, as high as 60-90m / s. The materials in the mill are mainly driven by the high-speed airflow to the powder classifier for sorting. Due to the large loss caused by local resistance and the resistance along the lifting of the material, the airflow resistance loss of the entire vertical mill is relatively large; at the same time, in order to lift the material, the vertical mill is required to have a high working air volume, resulting in a large overall power consumption of the circulating fan

[0004] Second, for ordinary external circulation material bed grinding equipment and systems (such as roller presses, etc.), placing the powder selection and grading system outside will result in a large system equipment, and it is also necessary to set up a steady flow bin and a certain height of the slide to form A certain material column pressure; at the same time, the powder selection device and the grinding device are not compact in structure, which increases the manufacturing cost and civil construction cost

[0005] The 3rd, in existing vertical mill at present, comprise a kind of grinding device (Chinese patent document CN103537338A) that only directly enters air into separator in the upper part of vertical mill; The material in the machine is dried. When the material moisture is high, the material cannot be completely dried, and the wet material will be blocked at the inlet and outlet of the mill elevator, which leads to poor adaptability of the system to the material and affects the normal operation of the entire system.

[0006] Fourth, in the existing vertical mill external circulation grinding system, the principle of traditional separator is adopted; all the materials are dispersed through the upper spreading device (Chinese patent document CN102698853A), which will lead to the separation of the separator The material concentration in some areas is very high, and the dispersion effect is not good, which affects the material classification effect and further affects the system output.

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