A powder classification device and method

Abstract

The invention relates to a powder grading device and method, and belongs to the technical field of powder manufacturing. The grading device comprises a powder supply portion, a gas supply portion, a grading portion, a collection portion, a purifying portion, a control portion, an auxiliary portion and the like. The powder grading device is divided into first-level grading, second-level grading, multi-level grading and the like. The multi-level grading device is formed by connecting a plurality of grading units in series. Mechanical grading, wind grading and high-frequency vibration net cleaning are organically combined together. The grading precision can be effectively improved, powder granularity stability is increased, the continuous grading time is prolonged, grading cost is reduced, and the grading method is high in precision and efficiency, low in cost, environmentally friendly, and suitable for continuously manufacturing high-quality powder especially the powder with the high fine powder proportion and small density.

Description

technical field [0001] The invention relates to a powder grading device and method, which organically combines mechanical grading, wind grading and high-frequency vibration net cleaning technology and is applied to powder grading in the powder industry, belonging to the technical field of powder preparation. Background technique [0002] High-performance functional powder material is a powder material that is directly used by utilizing the inherent physical and chemical characteristics of the material itself. It has excellent physical and chemical properties, which can effectively improve the performance of the material and reduce production costs. Especially in the case of global resource and energy shortages, all kinds of high-tech products are developing in the direction of lightweight, miniaturization and multi-functional integration, which has rapidly increased the demand for high-performance functional powder materials. , automobile manufacturing, biomedical, national ...

AI Technical Summary

Problems solved by technology

Japanese Patent Laid-Open No. 19758 proposes a method of powder classification technology, but it needs to use nylon mesh, the classification accuracy is not very high, and the screen mesh is worn out quickly, which is not conducive to ensuring the quality of powder; Chinese patent 00246106.4 proposes a powder classification device, the device The vibration source is located in the center of the screen, and the cleaning effect of the screen in the far center area is not ideal. At the same time, because there is no airflow to clean the screen, the cleaning effect is difficult to achieve an ideal state; Chinese patent 99250658.1 proposes a powder classification device, which does not have high Frequency vibration to clean the net makes the ability of airflow to clear the net limited; Chinese patent 201010623153.3 proposes a method of powder classification technology, but the net cleaning effect of this method is not very good, and it is difficult to effectively remove the lower limit powder when classifying the powder with more lower limit powder. , the lower limit powder will block the sieve, which will gradually deteriorate the performance of the sieve, resulting in unstable powder particle size; when classifying powders with low density, the fine powder will float in the sieve space during the grading process and cannot be effectively screened out. As a result, the proportion of excessive powder in the product is large, which affects the accuracy of the particle size of the powder product, resulting in the failure of the powder performance to meet the requirements

Chinese patent 201110243887.3 proposes a method of powder classification technology. This method is a pneumatic classification method, so its classification accuracy is not high, and it is difficult to meet the occasions with high requirements for powder particle size distribution. At the same time, this method has damage to the surface of soft powder. Not conducive to obtaining better powder morphology

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