Powder feeding system of nano powder preparation process

Abstract

The invention relates to a powder feeding system of a nano powder preparation process. The powder feeding system comprises a storage bin, a spiral feeder, a powder feeder and a flexible pinch valve. The storage bin is provided with a material level meter, and a feeding screw rod in the spiral feeder is connected with a speed regulating motor through magnetic coupling. The diameter of the powder feeder is larger than the inner diameter of a powder feeding barrel, and a plurality of feeding through holes are arranged in the circumferential direction of a powder feeding disk. When the powder feeding disc rotates, the feeding through holes which are screwed out of the inner cavity of the powder feeding barrel correspondingly communicate with a discharging hole and an air inlet hole. The flexible pinch valve comprises a rubber tube and two pairs of pinch rods, and each pair of pinch rods are connected with an electric push rod. When the electric push rod moves, the pair of pinch rods clampthe rubber tube. An air tap is arranged at the discharge end of the rubber tube; the air tap is connected with a vacuumizing device and a working gas recharging device. The powder feeding system of the nano powder preparation process solves the problems of sealing, transmission, conveying and the like of micron-level powder raw materials which are difficult to solve in the powder feeding process,and the delivery value of the powder raw materials can be stably and accurately controlled, so that the plasma flame flow is stable, and the required particle size of nano powder is further achieved.

Description

technical field [0001] The invention relates to the field of nano-powder preparation devices, in particular to a powder feeding system for a nano-powder preparation process. Background technique [0002] Metal nanopowders have been used in materials, electronics, information, medicine, aerospace and other fields, and can be used in the preparation of new high-capacity magnetic materials, high-efficiency catalysts, magnetic fluids, wave-absorbing materials, and high-efficiency combustion aids. The methods for preparing metal nanopowder include sputtering method, microwave energy method, arc plasma method, electric explosion method, laser method, chemical method and so on. The arc plasma method is commonly used at present. [0003] In the process of preparing nano-powder by arc plasma method, the powder raw material needs to enter the plasma furnace for heating through the powder feeding system. Feeding devices are used in various types of equipment, but in the field of nano...

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Problems solved by technology

[0007] 4. Due to the sealing of the whole process of powder feeding, it is difficult for the operator to grasp the powder feeding status and the problems that arise, resulting in problems such as unstable feeding of the plasma furnace, or even material breakage;

[0008] 5. Since a large amount of powder raw materials cannot be stored in the powder feeder, the powder feeder needs to be opened for frequent addition of powder raw materials, which will cause the working gas in the powder feeder to flow out, and the outside air will enter, which will affect the plasma furnace. How to realize the uninterrupted supply of powder raw materials is also a difficult problem

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