Composite extrusion 3D printing nozzle and 3D printer

Abstract

The invention discloses a composite extrusion 3D printing nozzle comprising a fixed plate, a plunger structure installed on the fixed plate, a screw extrusion structure installed on the fixed plate, and a material spraying assembly connected with the screw extrusion structure, wherein the plunger structure communicates with the screw extrusion structure and is used for operation that materials enter the screw extrusion structure from the plunger structure, and thus the materials are sprayed out from the material spraying assembly. The composite extrusion 3D printing nozzle comprises the fixed plate, the plunger structure, the screw extrusion structure and the material spraying assembly, semifluid, sticky and solid granular materials are extruded through the plunger structure and the screw extrusion structure, extrusion is smooth, the printing pump-back effect is good, feeding is easy and stable, and the composite extrusion 3D printing nozzle can adapt to various materials.

Description

technical field [0001] This application relates to the field of printing technology, in particular to composite extrusion 3D printing nozzles and 3D printers. Background technique [0002] Existing 3D printing nozzles mainly include plunger printing nozzles and screw extrusion nozzles. [0003] The plunger print nozzle has the problems of not smooth extrusion and unsatisfactory printing retraction when printing semi-fluid, viscous and solid granular materials. During the melting and printing process of solid granular materials, due to the insufficient density of the material, the particles If there is a gap between the plunger and the particles, there will be cavities of different sizes in the plunger. During the melting and printing process, these cavities will have an adverse effect on the extrusion situation, resulting in situations such as material breaking and continuous printing. effect cannot be guaranteed. During the melting and printing process of semi-fluid and v...

AI Technical Summary

Problems solved by technology

[0003] The plunger print nozzle has the problems of not smooth extrusion and unsatisfactory printing retraction when printing semi-fluid, viscous and solid granular materials. During the melting and printing process of solid granular materials, due to the insufficient density of the material, the particles If there is a gap between the plunger and the particles, there will be cavities of different sizes in the plunger. During the melting and printing process, these cavities will have an adverse effect on the extrusion situation, resulting in situations such as material breaking and continuous printing. effect cannot be guaranteed

During the melting and printing process of semi-fluid and viscous materials, there are few cavities, but due to the high viscosity of the material and the mixing of solid and liquid phases, it is more difficult to withdraw, so that the effect of the retraction cannot reach the nozzle directly. Unsatisfactory effect

[0004] When the structure of the screw extrusion nozzle is designed for semi-fluid, viscous and solid particles and other similar materials, it is difficult to feed and the feed is unstable. Due to the shape and characteristics of the material, it is difficult for the material to enter the screw groove by itself. , resulting in discontinuous and smooth screw extrusion and easy material breakage

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