A dual-material extrusion system with v-shaped switching print heads

Abstract

The invention discloses a double-material extrusion system with V-shaped switching printing heads. The double-material extrusion system comprises a base, a driving feeding wheel, two micro-guide railsliding blocks, two printing head assemblies, two switching guide assemblies and a switching assembly, wherein the two micro-guide rail sliding blocks are symmetrically arranged on the two sides of the driving feeding wheel in a vertical included angle mode, the two printing head assemblies are vertically mounted on the two micro-guide rail sliding blocks correspondingly, and the switching assembly drives the switching guide assembly to drive the printing head assemblies to be alternately switched at a certain angle in the center line directions of the micro-guide rail sliding blocks. According to the double-material extrusion system, the motion included angle structure of the two printing heads is innovatively designed, and the two printing heads are designed to be arranged in a symmetrical included angle structure, so that synchronous switching of the working states of a feeding assembly is achieved while the height difference of the printing heads is switched, the overall structureis simple and reliable, and the implementation is easy; and the two printing heads are alternately switched at a certain angle during switching, so that the coaxiality of feeding and discharging is guaranteed to be unchanged, and the stability of switching is improved.

Description

technical field [0001] The invention relates to a three-dimensional printer based on a fusion deposition rapid prototyping process, in particular to a double-material extrusion system with a V-shaped switching printing head. Background technique [0002] The 3D printer based on the fusion deposition rapid prototyping process uses plastic filaments with a diameter of about 1-2 mm, and melts and extrudes the plastic filaments into filaments of about 0.2-0.4 mm through a computer-controlled printing extrusion head and prints them layer by layer. stacked into three-dimensional objects. Usually, the fused deposition rapid prototyping process needs to add supports when manufacturing objects with cantilever structures. If the extrusion head of the 3D printer only has a single melt flow channel design structure, the printed object and support can only be constructed with the same material. Although during the printing process, the support part can be loosened by controlling the op...

AI Technical Summary

Problems solved by technology

However, relying on the thrust of the filament on the flow channel to switch the height difference of the print head, it is easy to be affected by the thermal properties of the material itself, resulting in a change in the thrust, thereby reducing the reliability of the print head, and relying on the spring mechanism to realize the reset of the print head after switching. There are high requirements on the processing and assembly precision of mechanical parts, and the quality is difficult to control, which will inevitably affect the accuracy of the switching height of the two printing heads; the switching of the height difference between the two printing heads through the driving mechanism requires a complex set of mechanical transmission, The positioning mechanism can only be realized by adding a driving motor, which increases the cost, volume and weight of the extrusion system, and greatly restricts the improvement of printing speed

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