Screening device and method for mixed steel powder and dissimilar powder for SLM forming

The invention provides a screening device and method for mixed steel powder and dissimilar powder for SLM forming, which belongs to the technical field of SLM forming auxiliary equipment. The screening device comprises a feeding barrel, a screening module, a control module, a powder separation module, a recycling barrel and an atmosphere module; the upper portion of the screening module is connected with the feeding barrel through a first pipeline, and the lower portion of the screening module is connected with the upper portion of the powder separation module through a second pipeline; the atmosphere module is connected with the screening module through a third pipeline; the lower part of the powder separation module is connected with the recycling barrel through a fourth pipeline. Beforescreening operation, the control module controls the atmosphere module to inflate and replace the screening module, and the control module controls the screening module and the powder separation module to start screening ope