3D printing-based device for shield tunnel lining formation

A 3D printing-based device for shield tunnel lining formation, comprising an extrusion assembly, a heating and transportation assembly, a material delivery and distribution control assembly, a cooling assembly, a speed control assembly, a control system, and a lining forming assembly, wherein:

• the extrusion assembly includes a screw pump motor and a single-screw extruder;
• the heating and transportation assembly includes a heating belt and a molten printing material transport pipe, and the molten printing material transport pipe is equipped with a heating device to maintain a temperature of the material during transportation in the molten printing material transport pipe;
• the material delivery and distribution control assembly includes a solid printing material delivery pipe, a detachable feed bucket, and a distribution controller;
• the cooling assembly includes a first lining cooling jacket and a second lining cooling jacket;
• the speed control assembly includes an external speed measuring instrument and a speed adjustment instrument;
• the control system includes a control panel;
• the lining forming assembly includes a lining forming mold;
• the lining forming mold comprises a lower part and an upper part, the lower part and the upper part are connected through and fixed;
• the lower part includes a plurality of lower components;
• each of the lower component includes a long side end connected to the upper part of the lining forming mold and includes a short side end connected to the molten printing material transport pipe;
• for each of the lower component, a circumference of the long side end is longer than that of the short side end, and the cross-sectional area of the long side end is less than or equal to that of the short side end;
• a plurality of the long side ends are connected in series to form a circular ring that is connected and communicates with the upper part of the lining forming mold;
• a shape of the upper part of the lining forming mold is formed by nesting two cylindrical pipes with different diameters, and a space between nested layers constitutes an internal space of the upper part of the lining forming mold;
• the lining forming mold is connected and communicated with the molten printing material transport pipe through the short side end of the lower component, and every the short side end connects to the molten printing material transport pipe;
• a flow sequence of a molten printing material is as follows:
• entering the short side end from the molten printing material transport pipe, then flowing through the long side end into the upper part of the lining forming mold, and finally being extruded from the upper part of the lining forming mold.