Minitype extrusion spray head for mixed color printing

Abstract

The invention discloses a minitype extrusion spray head for mixed color printing. The minitype extrusion spray head comprises a charging barrel, a threaded rod, a nozzle, a heating device, a bearing pedestal, a feeding device and a drive motor. The threaded rod is arranged in the charging barrel, the nozzle is arranged at the front end of the charging barrel, the tail end of the charging barrel is fixedly connected with the bearing pedestal, and the tail end of the bearing pedestal is fixedly connected with the drive motor. A shaft at the tail end of the threaded rod in the charging barrel is arranged in the bearing base through a bearing, and a shaft of the threaded rod is fixedly connected with an output shaft of the drive motor. The feeding device comprises at least two material filament channels which are symmetrically distributed at the tail end of the charging barrel. The heating device is arranged on the charging barrel and used for heating materials in the charging barrel. The minitype extrusion spray head achieves feeding, plasticizing and extruding through the stirring action of the threaded rod, can carry out sufficient mixing and color mixing on two or more kinds of thermoplastic materials, is simple in structure and low in energy consumption and achieves mixed printing.

Description

technical field [0001] This patent relates to the technical field of 3D printing, and relates to a printing micro-extrusion nozzle, in particular to a color-mixing printing micro-extrusion nozzle. Background technique [0002] Fused deposition modeling technology is a kind of rapid prototyping technology. This process technology is to extrude a filamentous material such as thermoplastic, metal or wax melt from a heated nozzle, and perform melt deposition manufacturing at a certain rate according to the preset trajectory of each layer of the molded part. Every time a layer is printed, the worktable is lowered by one layer thickness or the nozzle is raised by one layer thickness to superimpose and deposit a new layer, and this process is repeated to finally realize the deposition and molding of the part. [0003] The most critical structure of the fused deposition molding process is the nozzle part. The design rationality of its mechanical structure is directly related to whe...

AI Technical Summary

Problems solved by technology

Among them, they all adopt the method of heating after feeding first. When the thermoplastic material passes through the throat until it is sprayed out, the heating block melts it and produces a phase change. Faults appear in the filament, or due to the influence of unstable heating temperature, the phase change of thermoplastic materials is uneven when heated, resulting in easy plugging of the nozzle or uneven sprayed filament, which affects the surface roughness of the printed product

At the same time, most of the existing mixed-color printing nozzles adopt a double-input and double-output structure, which will not only increase the weight of the nozzle, but also affect the printing efficiency and effect

There are also some mixed-color printing nozzles that adopt a double-inlet and single-outlet plunger structure. Although this structure can greatly reduce the weight of the nozzle, it is difficult to achieve the effect of mixed-color printing, because the thermoplastic filament cannot be fully mixed during the extrusion process.

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