High-efficiency arc discharge preparation device of metal powder for 3D printing

Abstract

The invention discloses an enhanced double-tube laryngeal mask. The enhanced double-tube laryngeal mask comprises a mask body, a hard shaping tube, a bendable ventilating tube, a draining tube, a ventilating tube and an inflatable air pocket, wherein one end of the ventilating tube is connected to the bendable ventilating tube, and the other end of the ventilating tube passes through the hard shaping tube to be connected with the mask body; the inflatable air pocket is connected with the mask body; the draining tube passes through the hard shaping ventilating tube and the mask body. According to the enhanced double-tube laryngeal mask, the placement mode of the laryngeal mask is changed, and more important is that a stomach tube can be placed during use, so that surgical operation can be conveniently carried out. The enhanced double-tube laryngeal mask can overcome various defects of a traditional laryngeal mask, and is safe, efficient, and easy to operate.

Description

technical field [0001] The invention belongs to the field of mechanical equipment and automation, and relates to a high-efficiency arc discharge preparation device for metal powder for 3D printing. Background technique [0002] Additive manufacturing technologies such as 3D printing and laser cladding are hot areas of current research. Compared with the traditional subtractive material manufacturing technology, the restrictive additive manufacturing process involves a large amount of solid metal materials, which are used for the printing of parts or the cladding and trimming of metal substrates. [0003] The high temperature melting metal or conductive material produced by spark plasma discharge can be used to prepare metal powder. For example, the literature discloses the method of using spark plasma to prepare superalloy powder (Yu Jun et al., New technology for preparing superalloy fine powder by spark plasma discharge [J]. Acta Metallica Sinica. 44(7), 2008:892-896), am...

AI Technical Summary

Problems solved by technology

The method described in this patent document is to use the electrodes immersed in the reaction liquid to discharge to realize particle preparation, and its disadvantages are: 1) If the electrodes are immersed in the reaction and continuously discharged for 30 minutes, it will inevitably cause a serious temperature rise of the reaction liquid, and increase the work of the cooling cycle system 2) The temperature of liquid nitrogen, liquid helium and other gases is low, and the operation of electrode placement is difficult, while the conductivity of high-purity water increases significantly under the action of ion discharge generated by arc discharge, and an ion exchange system needs to be added

3) Utilizing the electrode immersion method, there is a lack of effective short-circuit prevention measures, and continuous preparation is difficult due to electrode loss

[0006] In short, the existing technology uses spark plasma or arc plasma to prepare metal powder. The existing problems are summarized as follows. First, the preparation efficiency. Using arc plasma preparation, although high temperature can be generated, the molten liquid metal, evaporated gaseous metal and cooled solid particles in the discharge process are very easy to cause a short circuit between the electrodes, thus affecting the production efficiency; second, the arc breaking mechanism, due to The high energy density of the plasma such as electric arc, the continuous discharge electrode will easily lead to the ablation damage of the particles, if there is no sufficient and reasonable arc breaking mechanism, it will affect the quality of the particle preparation; third, the particles between the electrodes are excluded, and ordinary block electrodes are used Immersion discharge or other preparation methods without auxiliary chip removal movement, on the one hand, the material loss is not uniform, which makes continuous preparation difficult, and on the other hand, it is easy to cause short circuit due to poor particle removal; Fourth, discharge medium protection, especially for immersion discharge, Dielectrics containing metal powder lead to changes in interelectrode discharge characteristics

Images