3D printing nozzle and 3D printer

Abstract

The invention provides a 3D printing spray head and a 3D printer, belongs to the technical field of additive manufacturing, and solves the problem that a spray nozzle cannot prevent leakage during 3D particle printing in the prior art. The device comprises a feeding port, a feeding pipe, a discharging pipe and a nozzle, a movable shaft capable of moving axially and a driving device capable of driving the movable shaft to move axially are arranged in the discharging pipe, a material blocking part is arranged on the movable shaft, a through hole communicated with the discharging pipe is formed in the end of the feeding pipe, and the nozzle is arranged in the through hole. The movable shaft is further provided with a pressure adjusting piston attached to the inner wall of the discharging pipe, a discharging channel is formed among the pressure adjusting piston, the material blocking part and the discharging pipe, the material blocking part can axially move along with the movable shaft so that the discharging channel can be communicated with or disconnected from the nozzle, and when the discharging channel is disconnected from the nozzle, the material blocking part can block the discharging channel. Negative pressure can be formed in the position, close to the nozzle, in the discharging pipe so that raw materials on the nozzle can be sucked back into the discharging pipe, and when the discharging channel is communicated with the nozzle, the nozzle can conduct discharging and printing.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular, relates to a 3D printer nozzle and a 3D printer. Background technique [0002] Additive Manufacturing (AM), commonly known as 3D printing, uses software and numerical control systems to stack special metal materials, non-metal materials, and medical biomaterials and other consumables layer by layer according to extrusion, sintering, melting, light curing, spraying, etc. , a manufacturing technology that produces physical objects. Compared with the traditional processing mode of raw materials, it is a "bottom-up" manufacturing method through material accumulation, which makes it possible to manufacture complex structural parts that were constrained by traditional manufacturing methods and could not be realized in the past. [0003] 3D particle printing is a kind of 3D printing technology. Different from the mainstream 3D silk printing, the raw material of 3D part...

AI Technical Summary

Problems solved by technology

[0004] At present, the raw material withdrawal function of most 3D printer nozzles is designed for 3D filament printing, but this withdrawal function cannot meet the needs of 3D particle printing, so that when 3D particle printing prints some depressions, the nozzle cannot prevent the raw material from flowing. outflow, which greatly affects the quality of the printed product

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