Sandwich compound building 3D printing material, preparing method and preparing device thereof

Abstract

The invention discloses a sandwich compound building 3D printing material, a preparing method and a preparing device thereof. The device comprises a hopper, a hollow spiral rod and a rotating motor; the hollow spiral rod is arranged in the hopper, a spiral structure is arranged outside the hollow spiral rod, a cavity allowing a flexible fiber bundle to axially pass through is formed in the hollowspiral rod, a fiber bundle inlet and a fiber bundle outlet are formed in the two ends of the cavity, the fiber bundle outlet is aligned with and narrower than a discharging opening, and the rotating motor is connected to the hollow spiral rod. The flexible fiber bundle penetrates the cavity in the hollow spiral rod, 3D printing slurry is added from the hopper, the hollow spiral rod rotates, the 3Dprinting slurry is extruded, the flexible fiber bundle is evenly wrapped by the 3D printing slurry, and the brand-new sandwich compound building 3D printing material is formed; the anti-cracking ability, the tensile strength and anti-shear performance of the 3D printing material are reinforced, the flexible fiber bundle is arranged in an orientation manner in the length direction, the fiber spacedirection is distributed in the direction most beneficial to tensile strength improving, and the enhancement effect of fibers can be maximized.

Description

technical field [0001] The invention relates to the field of architectural 3D printing technology, in particular to a sandwich composite architectural 3D printing material, its preparation method and its preparation device. Background technique [0002] Existing 3D printing of buildings is mostly extruded materials, which are superimposed layer by layer to realize the printing of buildings, but buildings and components need to add reinforcement ribs to enhance their tensile and shear strength. The current solution is to automatically print cement mortar and manually add Steel bars complete the forming of components, and the efficiency is low. [0003] In order to enhance the crack resistance, tensile strength and shear resistance of 3D printing materials, it is usually necessary to use fiber reinforcement, but currently the main method is to uniformly disperse chopped fibers in cement mortar. The spatial and directional distribution of fibers in the material will affect the...

AI Technical Summary

Problems solved by technology

The spatial and directional distribution of fibers inside the material will affect the cracking performance and toughness of the composite material. Only the fibers parallel to the tensile stress direction can fully exert the tensile properties of the fibers, while the fibers perpendicular to the tensile stress will reduce the material’s tensile strength. Tensile strength

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