Flow field construction method and grading device used for particle grading

Abstract

The invention relates to the technical field of powder preparation and processing and discloses a flow field construction method and a grading device used for particle grading. The method includes thesteps that uniform rotating gas flow and perturbation gas flow located below the rotating gas flow are correspondingly formed in a particle grading cavity, and therefore particles entering the particle grading cavity are firstly graded under the effects of the rotating gas flow, and then enter the rotating grading gas flow again under the effects of the perturbation gas flow to be graded. The flow field construction method for particle grading can perform more sufficient grading on the particles, and therefore the grading device applying the method has higher grading precision.

Description

technical field [0001] The invention relates to the technical field of powder preparation and processing, in particular to a flow field construction method and a classification device for particle classification. Background technique [0002] Airflow classification technology is widely used in chemical, mineral, metallurgy, abrasive, ceramics and other particle preparation and processing links. The principle of centrifugal airflow classification is widely used because of its high classification efficiency, especially the third-generation turbine classifier is most commonly used. The turbine classifier mainly includes a vertical classifier and a horizontal classifier. The axle of the classifying wheel of the vertical classifier is installed vertically relative to the horizontal plane, while the axle of the classifying wheel of the horizontal classifier is installed horizontally relative to the horizontal plane. Multiple technical links need to be considered comprehensively d...

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Problems solved by technology

[0003] However, the current existing horizontal classifiers have chaotic airflow field and unreasonable airflow distribution, resulting in low classification accuracy and low sorting efficiency.

For example, if Figure 8 As shown, in the ATP air classifier of Alpine Company, the air passes through the tangential air inlets 21' and 323' to generate an airflow field rotating in the vertical direction, and the horizontal classifying wheel 1' rotates under the drive of the rotating shaft 9' The airflow around it is induced to form an airflow field that rotates in the horizontal direction. These two airflows with different rotation directions interfere with each other inside the classifier and cause turbulence in the classification flow field, so that the classification accuracy of the horizontal classifier is not high.

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