When metal powder laser forming (3D printing) parts is produced, it is accompanied by the generation of metal condensation substances, which can cause powder contamination when mixed in the powder. In addition, active metal powders and fine particles such as aluminum and titanium have a high probability of being oxidized. These escaping metal powders are sucked into the screening machine for separation at any time, and they are completely in a closed inert gas atmosphere during the cycle to ensure low oxygen content. , to avoid oxidation of the fine powder, and the separated metal powder enters the powder feeder for reuse.Raw material extraction - filtration - crystallization - separation - drying - sieving - inner packaging - outer packaging Extraction of raw materials: According to the solubility of various components in Chinese herbal medicines in solvents, a solvent with high solubility for active components and low solubility for components that do not need to be dissolved is selected, and the method of dissolving the active components from the tissue of the medicinal material is called solvent extraction. Filtration: Filtration refers to a unit operation of separating solid matter particles suspended in a gas or liquid, using a porous material (filter medium) to pass the gas or liquid in the suspension (filter slurry) (filtrate), intercepting The solid particles (filter residue) that come down remain on the filter medium to form a filter cake. Crystallization: When a hot saturated solution is cooled, the solubility of the solute decreases and the solution becomes supersaturated, so that the solute precipitates in the form of crystals. Separation: Dry and wet separation. Drying: Use heat to vaporize moisture (moisture or other solvents) in wet materials, and use airflow or vacuum to take away the vaporized moisture to obtain dry materials. Screening: The material is sorted by particle size. Packaging: Finished packaging.● Fully enclosed and filled with inert gas to ensure low oxygen content and explosion-proof system. ● Separate molten large particles to provide a stable guarantee for the printing system. ● Continuous separation, does not affect the continuous work of the printer. ● Automatic recovery and backfilling without manual intervention to avoid harm to human body. ● Additive recycling to reduce material loss. ● With few parts, it is easy to disassemble and assemble, and it is easy to clean up thoroughly and reduce the cleaning time. ● The system operates in an airtight manner, with no fine powder escaping and low noise.It is used in the 3D printing industry to collect, recover and filter metal powder in the 3D printing process to realize the reuse of raw materials. It is suitable for the screening and recovery of metal powder, alloy powder, aluminum, titanium and other materials.