Forming cylinder device for selective laser melting and selective laser melting equipment

The invention relates to a forming cylinder device for selective laser melting and selective laser melting equipment, the forming cylinder device comprises a forming cylinder body and a base plate mechanism, and the forming cylinder body is provided with a cylindrical containing cavity; the base plate mechanism comprises a base plate body and a sealing assembly, the base plate body is matched with the containing cavity and can move along the containing cavity, and a plurality of gas flow channels are formed in the base plate body; the sealing assembly comprises a first sealing ring, and the first sealing ring is arranged on the side wall of the base plate body and forms sliding sealing between the base plate body and the containing cavity. The first sealing ring is lower than the air outlet hole. The air flow is jetted to the containing cavity along the air outlet included angle, and the containing cavity of a cylindrical structure is matched, so that the jetted air flow rotates in the containing cavity, and