3D printer

Abstract

The invention relates to a 3D printer based on a fusion accumulation rapid-forming process. The 3D printer is characterized by comprising a transmission mechanism, a worktable, a feeding mechanism and an isolating device. By utilizing a specific driving wheel and driven wheel and line transmission fit manner, the friction coefficient is increased, the problem that a belt wheel slips in a belt transmission process is solved, and transmission motion is accurate and reliable.

Description

technical field [0001] The invention relates to a 3D printer based on a fusion deposition rapid prototyping process. Background technique [0002] 3D printer is a machine of rapid prototyping technology. It is a technology based on a digital model file and using bondable materials such as powdered metal or plastic to construct objects by layer-by-layer printing. Using a 3D printer to print the model does not require traditional cutting machine tools and molds. Under the control of the computer, the 3D entity can be directly formed according to the 3D model of the workpiece. [0003] The nozzle is a component used to output consumables in the 3D printer. During the printing process, the nozzle is required to be able to move arbitrarily in space to deal with workpieces with different external contours. Most of the existing 3D printer nozzle transmission mechanisms use the transmission mechanism of the traditional three-axis linkage machine tool, that is, the axes along the X,...

AI Technical Summary

Problems solved by technology

The structure of this three-axis linkage transmission mechanism is relatively complex and takes up a large space. In addition, during the printing process, when moving between different positions, three drive units are required to drive the nozzle to move in sequence, so the printing efficiency is relatively low. Low

[0004] The patent application with the application number 201310246765.9 provides a kind of "more than three transmission assemblies distributed on the periphery of the platform, each transmission assembly includes a guide rod extending along the height direction, a sliding seat mounted on the guide rod, The driving motor used to drive the sliding seat to move up and down along the guide rod, and the connecting rod. The two ends of the connecting rod are respectively connected to the mounting seat and the sliding seat in a universally hinged manner. The seat adopts the traditional belt transmission method, which cannot guarantee an accurate transmission ratio, but 3D printing has strict requirements on precision; in addition, the guide rod uses a sliding method to guide the sliding seat, and the friction between the guide rod and the sliding seat is relatively large, which is prone to relative friction. The invalid movement of the sliding seat leads to poor positioning accuracy of the sliding seat; finally, because the position of the extrusion head needs to be kept level all the time in 3D printing, once any of the guide rails of the above-mentioned 3D printer deviates, if it is not corrected in time, it will cause the workpiece to be produced. Deformation, which seriously affects the quality of the workpiece

In addition, the working space of the 3D printer is open, and the cleanliness and temperature of the working environment are important factors that affect the work; The feed wheel with teeth on the surface of the assembly, the press wheel pivotally connected to the support seat assembly and located above the feed wheel, and the stepper motor used to drive the feed wheel to rotate, the rotating shaft of the feed wheel and the press wheel The rotating shafts are parallel to each other, and the linear printing consumables pass through the gap between the feeding wheel and the pressure wheel and then enter the nozzle". The structure of feeding resistance is large and feeding accuracy is poor, resulting in a decrease in printing accuracy

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