Extrusion device for 3D printer, and cooling mechanism and cooling method thereof

Abstract

The invention discloses an extrusion device for a 3D printer, and a cooling mechanism and a cooling method thereof. The extrusion device for the 3D printer comprises a shell, a nozzle, a ratchet, a pressurizing idler wheel and the cooling mechanism, wherein the nozzle is connected with the shell; the ratchet is disposed in the shell; the pressurizing idler wheel is arranged adjacent to the ratchet; the ratchet and the pressurizing idler wheel jointly clamp a hot melt material and guide the hot melt material for extrusion through the nozzle; the cooling mechanism comprises an air pump and a honeycomb duct; and the honeycomb duct is partially arranged in the shell and is connected with the air pump to guide air drawn by the air pump to flow into the shell through the honeycomb duct, so ambient temperature in the shell can be reduced. Therefore, the technical effect of effective improvement of cooling effect and printing quality can be achieved through arrangement of the diversion type cooling mechanism.

Description

technical field [0001] The invention relates to an extrusion device of a three-dimensional printer, in particular to an extrusion device of a three-dimensional printer, a cooling mechanism and a cooling method thereof. Background technique [0002] In recent years, with the popularization of 3D printing (3D printing), also known as additive manufacturing (AM), in which fused deposition modeling (Fused Deposition Modeling, FDM) additive manufacturing is widely used in many machines, The main principle of this type of laminated manufacturing is to use a three-axis machine tool with an extrusion nozzle to extrude plastic or other materials. Most extrusion nozzles use ratchets to clamp the material wire, and use friction to drive the linear hot-melt material to The nozzle is pushed forward and heated to a certain temperature at the nozzle end, which can melt the linear hot-melt material into a molten state, spray thin lines through the small nozzles, and fill the thin lines in t...

AI Technical Summary

Problems solved by technology

If the temperature of the forming space is slightly lower than the thermal deformation temperature of the hot-melt material, the temperature of the adjacent ratchet is close to the thermal deformation temperature of the material. At this time, the linear hot-melt material is prone to softening, which reduces the strength of the material, and the ratchet As a result, the friction between the hot-melt material and the hot-melt material is changed, causing the material to not be extruded smoothly, thereby reducing the printing quality

[0005] In the existing technology, a fan is directly added near the ratchet to cool down with airflow. However, since the temperature of the adjacent ratchet is close to the heat distortion temperature of the material, the cooling effect of using internal air for convection is limited.

In addition, when the fan rotates, it is easy to cause the extrusion nozzle to vibrate, making the printing process unstable and affecting the printing quality

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