Ultrasonic vibration screen with inertia gas protection system

Abstract

An ultrasonic vibration screen with an inertia gas protection system comprises a raw material tank which is communicated with a screen body. A gas tube is communicated with an Ar source tank through a gas valve A. A gas guide tube is connected with the screen body. The gas valve A, a gas valve B and an oxygen analysis instrument are connected with a central processing unit. The oxygen analysis instrument is arranged in the screen body. An ultrasonic generation unit is connected with the screen body, and two outlets in the screen body are connected with a power collection tank A and a powder collection tank B respectively. The remaining oxygen limit is set, and a ball valve B, a ball valve C and a ball valve E are closed. The Ar gas enters the screen body, air in the screen body is discharged, the oxygen analysis instrument transmits detection data to the central processing unit, and the gas valve A and the gas valve B are closed when the set numerical value is reached. When the data are higher than the set limit values, oxygen reaches the set limit value, the gas valve A and the gas valve B are closed, and the gas valve A is opened, the ultrasonic generation unit is started, and screening is started. By means of the system, clustering and oxidation during ultrafine powder screening are prevented.

Description

technical field [0001] The invention belongs to the technical field of screening for post-treatment of powders, and in particular relates to an ultrasonic vibrating screen with an inert gas protection system, which is suitable for screening ultrafine metal powders which are easily oxidized. Background technique [0002] Metal powder can be screened by vibrating sieve and air flow sieve. The vibrating sieve uses a motor as the excitation source. Eccentric weights are installed at the upper and lower ends of the motor to convert the rotational motion of the motor into three dimensions of horizontal, vertical and inclined. Movement, and then pass this movement to the screen surface. Adjusting the phase angle of the upper and lower ends can change the movement track of the material on the screen surface, so that the powder can penetrate the screen and achieve the effect of screening. When the ultra-fine powder needs to be sieved, because the fine powder will agglomerate, it is ...

AI Technical Summary

Problems solved by technology

The above two methods cannot avoid the contact between the sieved powder and the air. When the sieved powder is easily oxidized, such as titanium and titanium alloy powder, the oxidation of the powder will occur during the sieving process, and it is difficult to ensure the quality of the powder.

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