Bidirectional powder spreading device, SLM equipment and bidirectional powder spreading method

The invention relates to the technical field of additive manufacturing, in particular to a bidirectional powder laying device, SLM equipment and a bidirectional powder laying method. The bidirectional powder spreading device comprises a powder spreading platform, a transmission device, a powder supply cylinder, a first limit switch and a scraper device, the transmission device and the first limiting switch are both arranged on the side wall of the powder laying platform, the transmission device is arranged in the extending direction of the powder laying route, the powder supply cylinder is arranged on the powder laying platform and located at the front end of the forward powder laying route, and the first limiting switch is located at the tail end of the forward powder laying route; the scraper device comprises a mounting frame, a cylinder assembly and a scraper assembly, the mounting frame is arranged on the transmission device, the cylinder assembly is arranged on the mounting frame, and the scraper assembl