3D printing air nozzle and multi-channel telescopic nozzle valve provided with air nozzle

Abstract

The invention discloses a 3D printing air nozzle. The air nozzle comprises a hollow air nozzle structure and a 3D printing nozzle, wherein the air nozzle structure comprises an air nozzle sealing section and an air outlet section, a nozzle hole is formed in the tail portion of the 3D printing nozzle, the 3D printing nozzle comprises a nozzle sealing section and a nozzle protruding section which are matched with the air nozzle sealing section, and the air nozzle structure installed around the outer side of the 3D printing nozzle. The invention further discloses a multi-channel telescopic nozzle valve provided with the air nozzle. The multi-channel telescopic nozzle valve comprises the 3D printing air nozzle and further comprises an installation base, cylinders and a valve needle, wherein the upper section of the installation base is provided with a feeding channel, the lower section of the installation base is provided with inner holes, and discharge ports are formed in the tops of the inner holes; the cylinders are installed in the inner holes and extend out from the open ends of the inner holes, and cylinder feed inlets are formed in the top ends of the cylinders; a hollow valve cavity is formed in each cylinder; the valve needle penetrates through the valve cavities and is installed on the installation base, and discharge channels are formed between the valve needle and the valve cavities. The 3D printing nozzle is arranged on the tail portions of the cylinders, and the air nozzle structure is arranged on the lower portion of the installation base. Air outflow is uniform, precision is high, energy consumption is low, noise is low, and environment protection and energy conservation are achieved.

Description

technical field [0001] The present invention relates to the technical field of 3D printing, in particular to a tuyere for 3D printing, a multi-channel retractable nozzle valve with a tuyere using the tuyere for 3D printing, and a 3D printing system using the nozzle valve for 3D printing. Background technique [0002] 3D printing is a technology of manufacturing three-dimensional products by adding materials layer by layer through 3D printing equipment according to the designed 3D model. This layer-by-layer build-up forming technology is also called additive manufacturing. 3D printing integrates cutting-edge technologies in many fields such as digital modeling technology, electromechanical control technology, information technology, material science and chemistry. It is a kind of rapid prototyping technology and is known as the core technology of the "third industrial revolution". Compared with traditional manufacturing technology, 3D printing does not need to make molds in ...

AI Technical Summary

Problems solved by technology

[0003] In the process of 3D printing, there are also the following technical problems: in order to quickly print the hot material ejected from the nozzle, it needs to be properly cooled to control the flow state of the material. However, the existing technology usually uses fans and blowers for air cooling. The air cooling method has low accuracy and can only dissipate heat in a large area. However, in fact, it only needs to dissipate heat locally on the material that has just been extruded. The large-scale heat dissipation makes the surrounding materials that have cooled to an appropriate temperature continue to cool unnecessarily. The printing adhesion fastness of the next layer is reduced, that is, the accuracy of the existing air-cooled heat dissipation method is low

[0004] If the external air nozzle is used to precisely align the printing nozzle for cooling, there will be serious problems: the external air nozzle is set in any direction of the printing nozzle, and the wind force is biased, so the wind force should not be too large, because it is easy to blow away the printing material, the wind force If it is too small, the cooling effect will not be strong

[0006] In addition, there are also power outages, malfunctions and other reasons that lead to the interruption of the large-scale 3D printing process. The semi-finished products that have been printed will be too cold in the air. When the printing is resumed, local preheating is also required to increase the bonding fastness;

[0007] If the external air nozzle is used to precisely aim at the position of the material of the previous layer to be printed and blow hot air to preheat, there will also be serious problems: because the printing movement path of the current layer may be in any direction, the preheating air nozzle is set at any position, It is possible that the previous layer that is about to be printed cannot be preheated, but the current layer that has just been printed and needs to be cooled is heated.

[0009] Furthermore, when using multi-channel nozzles, unused nozzles need to be closed, and the blowing also needs to be stopped. In order to save the printing stroke space, multiple printing nozzles are often very close to each other, which also requires accurate printing in a small space. The opening and closing of the blowing device can be realized inside, and the traditional method cannot do this

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