Feeding venturi and feeding structure for 3D printer

Abstract

The invention provides a feeding venturi for a 3D (three-dimensional) printer. The feeding venturi comprises a radiating outer tube and a polytetrafluoroethylene inner tube embedded in the radiating outer tube; a feeding passage for enabling a printing material to pass through is formed in the polytetrafluoroethylene inner tube. According to the feeding venturi, by the polytetrafluoroethylene inner tube, the condition that the PLA (Poly Lactic Acid) printing material is blocked in the venturi is prevented and stability and smoothness of wire output of a heating printing head, so that surface quality of a printed model is improved; a feeding structure is simple and reliable, is low in cost and is suitable for popularization and application.

Description

technical field [0001] The invention relates to a 3D printer, in particular to a feeding throat and a feeding structure of a 3D printer. Background technique [0002] 3D printer is a kind of printing equipment based on 3D printing technology. The so-called 3D printer technology is a rapid prototyping technology of workpiece. It is based on the digital model file of the workpiece. The technology of forming workpieces by layer-by-layer printing of different materials. [0003] At present, there are four main types of 3D printing technologies: stereolithography (SLA), three-dimensional powder bonding (3DP), selective laser sintering (SLS) and fused deposition rapid prototyping (FDM). Among them, although 3D printers based on photolithography technology, three-dimensional powder bonding technology and selective laser sintering technology have high precision and a wide range of applicable materials, they often require large power, and the technology is relatively complicated. Eq...

AI Technical Summary

Problems solved by technology

However, when the 3D printer is printing, the printing material used is PLA polylactic acid material. Due to the physical characteristics of the PLA polylactic acid material itself, it will soften when it is about 70°, and it will start to expand when it is about 100°; In addition, During the printing process, the heat of the heated print head will be transferred to the feeding throat, and then transferred to the PLA polylactic acid material in the feeding throat; so after the 3D printer works for a period of time, the PLA polylactic acid material in the feeding throat will It will soften and expand, that is, the PLA polylactic acid material will be blocked at the feeding throat near the heating print head, which will eventually cause the heating print head to be completely blocked and affect the normal operation of the printer.

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