Rotary digital valve and injection system of 3D (Three Dimensional) printing equipment

Abstract

The invention provides a rotary digital valve. The rotary digital valve comprises a valve sleeve, a left valve core and a right valve core, wherein the left valve core and the right valve core can move axially left and right and are arranged in the valve sleeve in a synchronous rotating manner; the valve sleeve is provided with a left feed hole and a right feed hole; the circumferential surface of the left valve core is provided with a periodically distributed left receiving groove array, and the left receiving groove array is communicated with a left feeding passage; the circumferential surface of the left valve core is provided with a periodically distributed right receiving groove array, and the right receiving groove array is communicated with a right feeding passage; the proportional output quantity of the left feeding and the right feeding depends on the mechanical duty ratio formed by axial movement displacement of the left valve core and the right valve core; the opening and closing frequency of the rotary digital valve is equal to the product of the rotation speed of the synchronous rotation of the left valve core and the right valve core and the number of grooves in the left receiving groove array or the right receiving groove array. According to the rotary digital valve, high frequency response and accurate feeding can be realized through quick switching of the rotary valve core and proportional output of the double valve cores; the rotary digital valve can be applied to 3D (Three Dimensional) printing equipment.

Description

technical field [0001] The invention relates to a digital valve for rapid prototyping, in particular to a precise rotary digital valve for 3D printing of composite materials. Background technique [0002] 3D printing based on droplet jetting is one of the most viable rapid prototyping technologies. It breaks through the bottleneck of difficult manufacturing of complex parts by adding materials layer by layer, and greatly improves production efficiency. During the single-layer printing process, the liquid material in the working chamber of the print head forms droplets under the action of an external driving force, and is ejected to the corresponding position at a certain frequency and rate. Therefore, stable, precise and fast droplet ejection is the key to ensure the quality of 3D printing. [0003] The current 3D printing technology is mainly researched around its efficiency, accuracy and composite material printing. [0004] (1) In terms of high-efficiency printing: use ...

AI Technical Summary

Problems solved by technology

The current 3D printing mainly adopts the form of single nozzle printing, the printing speed is slow, and the printing material is single; while multi-nozzle printing is gradually developing, which increases the printing width to a certain extent, and can realize single-pass multi-layer printing, which improves the Printing efficiency, but multi-nozzle printing usually requires multiple motors and control components, etc., resulting in a larger printer size and higher cost

[0009] 2) It is difficult to achieve multi-material synchronous proportional injection, and the performance of the finished product is poor

However, at present, multiple independent nozzles are usually used for jet printing, and the synchronization is difficult to guarantee under fast and long-term work, which will lead to uneven output material ratio and ultimately affect the quality of the product

[0010] 3) The accuracy of printed products needs to be further improved

Since the position of the sub-droplet is not easy to control, it will have a negative impact on the printing accuracy of the product. At the same time, the problem of droplet leakage between two injections will also cause low printing accuracy and rough product surface.

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