A powder classification device and method

A grading device and a grading method technology, applied in chemical instruments and methods, solid separation, separating solids from solids with airflow, etc., can solve the problem that powder properties cannot meet the requirements, fast loss of screen mesh, unstable powder particle size, etc. problems, to achieve the effect of prolonging the continuous grading time, improving the grading accuracy and preventing the powder from escaping

Active Publication Date: 2016-08-17
BEIJING COMPO ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Hierarchical SnAg 3 Cu 0.5 powder. Such as figure 1 As shown, the device includes a powder supply part, a gas supply part, a classification part, a collection part, a purification part, a control part, an auxiliary part and other parts. The powder supply part includes the powder supply pipe 7 and other parts, the gas supply part includes the fan 15, the fan chamber 14, the air inlet pipe 12 and the air distributor 5, and the classification part includes the support ring 1, the connecting rib 2, the vibration ring 4, and the vibration source 3 , screen 9, base 10 and other parts, the collection part includes powder outlet pipe 17, first powder collection tank 18, powder collection cone 20 and other parts, and the purification part includes cyclone dust collector 23, filter 16, fan chamber 14 and other parts , the control part includes the control cabinet (PLC) 25, the pressure sensor 11 and other parts, and the auxiliary part includes the enclosure 13, pipelines and o...

Embodiment 2

[0085] Classified SnBi58 powder. The use of secondary classification devices, such as figure 2 As shown, it is composed of two-stage grading units connected in series. The difference is that in the first grading device, the powder collecting cone 20 is not connected with the conveying pipe 22, but connected with the secondary powder feeding pipe 50, directly passing through the The powder after the first stage classification is injected into the secondary screen 31, and the wind collecting ring 51 is added at the same time. The wind collecting ring 51 is connected to the cyclone dust collector 23 through the adapter 52 and the connecting pipe 53, and the other parts are connected to the primary classifying device. basically the same.

[0086]The classification atmosphere is nitrogen. The powder 8 is transported from the airtight container to the powder feeding pipe 7 through the electromagnetic vibrating powder feeder, and then falls onto the screen 9 (230 mesh) through the...

Embodiment 3

[0091] Classified SnAg0.3Cu0.7 powder. The use of secondary classification devices, such as figure 2 shown. The staging atmosphere is argon. The powder 8 is conveyed from the airtight container to the powder feeding pipe 7 through the electromagnetic vibrating powder feeder, and then falls onto the screen 9 (400 mesh) through the powder feeding pipe 7. The base 10 is driven by a known rotary vibration machine to generate three-dimensional vibrations, which are transmitted to the support ring 1, and then transmitted to the screen 9 by the support ring 1, so as to realize the primary classification of the powder. The frequency of the high-frequency vibration used to clean the screen cloth 9 is 47KHz, and its vibration mode is a pulse mode. The powder 8 passing through the primary screen 9, except that a small amount of ultrafine powder enters the wind collection ring 51, then settles to the second powder collection tank 24 through the cyclone dust collector 23 and enters the...

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PUM

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07B9/00
Inventor 徐骏朱学新胡强贺会军林刚李志刚王志刚刘建刘英杰张富文金帅安宁卢彩涛祝志华
Owner BEIJING COMPO ADVANCED TECH
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