Gas-assisted extrusion type forming device for 3D printing of multi-layer polymer product

The invention discloses a gas-assisted extrusion type forming device for 3D printing of a multi-layer polymer product. The printing device mainly comprises a multi-layer gas-assisted extrusion screw system, a three-dimensional motion system, a heating system and a support. The multi-layer gas-assisted extrusion screw component is characterized in that the multi-layer gas-assisted extrusion screw component is vertically mounted, a motor drives a screw to rotate, and the lifting motion of the extrusion screw is driven. The transverse ball screw and the longitudinal ball screw on the support provide X-direction and Z-direction movement, and the sample bearing table top provides Y-direction movement. The printing head completes assembly of the gas-assisted module, the multi-layer annular module and the spray head module through connecting pieces such as flange plates and pins, and 3D printing multi-layer flowing and viscoelasticity adjustment of polymer composite melt are achieved. According to the invention, und