Circulating filtering device suitable for additive manufacturing

Abstract

The circulating filtering device suitable for additive manufacturing comprises a box body, a back-blowing filter element, a passivator and a draught fan, the box body comprises an upper box body and a lower box body, a partition plate is arranged in the upper box body and divides the upper box body into an air purifying chamber and a dust air chamber, the back-blowing filter element is arranged in the dust air chamber, and the passivator is arranged in the dust air chamber. A dust collection barrel is arranged below the dust gas chamber in a communicating mode, the passivation device is located below the dust gas chamber, the lower end of the passivation device is inserted into the dust collection barrel, a purified gas outlet is formed in the purified gas chamber, a dust gas inlet is formed in the dust gas chamber, and the draught fan is arranged in the lower box body. A gas inlet of the fan is communicated with a purified gas outlet in the purified gas chamber through a pipeline, and a gas outlet of the fan is communicated with a purified gas port in the lower box body through a pipeline; the circulating filtering device suitable for additive manufacturing provided by the invention can automatically perform back flushing cleaning on the filter element, and can also automatically perform passivating treatment on flammable wastes generated by back flushing, so that the operation safety of equipment is ensured.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a circulating filter device suitable for additive manufacturing. Background technique [0002] Additive manufacturing technology is a rapid prototyping technology that has developed rapidly in recent years, and selective laser melting technology is one of the most promising metal additive manufacturing technologies. The technology first slices the 3D model, converts the 3D model into a 2D cross section, imports the cross section data into the device, uses a high-energy laser beam as a heat source to melt the metal powder to form a cross section, and finally forms a metal entity through layer upon layer superposition. [0003] The traditional laser selective melting circulation filtration system mostly adopts a two-stage filtration method, but the above filtration method has obvious disadvantages, such as high resistance of the filtration system, short service life ...

AI Technical Summary

Problems solved by technology

[0003] The traditional laser selective melting circulation filtration system mostly adopts the double-stage filtration method, but the above-mentioned filtration method has obvious disadvantages, the resistance of the filtration system is large, the service life of the filter element is short, and the filter element needs to be replaced frequently

When printing active metals such as aluminum alloys and titanium alloys, there is a possibility of deflagration of the filter element during the process of replacing the filter element, which will endanger the life and property of the operator. Therefore, it is urgent to invent a new type of circulating filter that is safe, reliable, and can run for a long time at this stage. system

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