Double-air supply airflow mill

Abstract

The invention relates to a double-air supply airflow mill which is used for powder making of magnetic materials. The double-air supply airflow mill comprises a main machine, a separator, a filter anda compressor which are sequentially distributed and connected, the air outlet of the filter is connected with the air inlet of the compressor through an air return pipe, the air outlet of the compressor is connected with the air inlet of a spraying nozzle in the main machine through a high pressure air supply pipe. The double-air supply airflow mill is characterized by further comprising a draughtfan, the main machine is provided with at least one low pressure air inlet, the low pressure air inlet of the main machine is connected with the air exhaust of the draught fan through a low pressureair supply pipe, and the air inlet of the draught fan is connected with the air return pipe; and a bypass pipe is connected between the low pressure air supply pipe and the air return pipe and is provided with an adjusting valve. The double-air supply airflow mill is high in powder milling quality, and the made powder size distribution is concentrated.

Description

technical field [0001] The invention relates to magnetic material powder milling equipment, and specifically provides a double air-supply jet mill. Background technique [0002] In the production process of magnetic materials, it is necessary to use jet milling to pulverize the raw materials into metal alloy powders of 3 to 5 microns. From a theoretical point of view, the more concentrated the powder particle size, the higher the final performance of the material after pressing and sintering. Jet mill needs to complete two tasks of pulverization and sorting in the milling process to obtain qualified powder. At present, most of the magnetic materials are produced by general-purpose jet mill. The main engine of the jet mill is composed of a grinding chamber and a sorting chamber. The grinding chamber is at the bottom and the sorting chamber is at the top. The function of the grinding chamber is to grind the materials. The grinding chamber is equipped with multiple nozzles. T...

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Problems solved by technology

[0003] The main machine in the jet mill grinds the powder by the high-pressure airflow from the nozzle. After the high-pressure gas is ejected, it expands in the grinding chamber and continues to flow to the sorting chamber to drive the powder into the sorting chamber for sorting; due to this airflow The same flow rate of airflow is used in the grinding process from powder grinding to sorting, and the grinding speed and sorting speed cannot be adjusted, which will make part of the ground powder unable to be sorted in time and be repeatedly ground too finely, which is affected by the existing airflow mill. Structural limitations lead to insufficient concentration of the particle size distribution of the prepared magnetic powder, low milling quality, and low repeated milling efficiency

[0004] In addition, in the airflow milling process, the grinding and sorting are completed by different equipment, which increases the production cost, and the operation is cumbersome. At the same time, it is difficult to control the oxygen content in the magnetic powder during the magnetic powder turnover.

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