Device for preparing 3D printing oriented steel fiber reinforced cement-based composite material

Abstract

The invention discloses a device for preparing a 3D printing oriented steel fiber reinforced cement-based composite material. The device comprises a motor, a linkage gear set, a primary steel fiber orientation unit, a secondary steel fiber orientation unit, a material conveying hopper and an auxiliary vibrator, wherein the linkage gear set comprises a driving gear and a driven gear; the primary steel fiber orientation unit comprises a steel fiber hopper, push type stirring blades, a rotating vertical shaft, propeller blades and a vertical rod; the material conveying hopper comprises a material storage bin, an extrusion pipe and an extrusion opening; and the secondary steel fiber orientation unit is a cylindrical permanent magnet. According to the device, directional distribution of steel fibers in the 3D printing steel fiber reinforced cement-based composite material in the printing direction is achieved, the steel fibers are distributed more evenly, the reinforcing effect of the steel fibers is fully achieved, the technical problems of material extrusion smoothness, printing material compactness, fiber protrusion on the surface of a printing test piece and the like during 3D printing of the composite material are solved, and the structural mechanical property of the composite material is improved.

Description

technical field [0001] The invention belongs to the field of 3D printing building materials, in particular to a device for preparing 3D printing directional steel fiber reinforced cement-based composite materials. Background technique [0002] 3D printing technology is a rapid prototyping technology that is based on digital model files and uses bondable materials such as powdered metal or plastic to construct objects by layer-by-layer printing. 3D printing is usually achieved by digital technology material printers It can be gradually applied in the fields of aerospace, automotive components, medical equipment, culture and art, and construction engineering. In terms of construction engineering, 3D printing technology is still in its infancy, and there are still certain technical defects. [0003] Researchers at home and abroad generally use fibers such as steel fibers, polyvinyl alcohol fibers, polyethylene fibers, and glass fibers to study 3D printing fiber-reinforced ceme...

AI Technical Summary

Problems solved by technology

In the existing architectural 3D printing technology, for 3D printing steel fiber reinforced cement-based composite materials, first of all, the steel fibers in the general 3D printed steel fiber reinforced cement-based composite materials are randomly distributed, only related to the tensile stress The steel fibers with close or consistent directions play a reinforcing role. In theory, only about one-third of the effective fibers are used, which leads to the inability of the steel fibers to fully play their due role when the 3D printed specimen is stressed; , Ordinary 3D printed steel fiber reinforced cement-based composites are not vibrated, so their compactness is poor

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