Feeding device for 3D printing

Abstract

The invention discloses a feeding device for 3D printing. The feeding device comprises a powder storing box and a powder leaking box; a first pipeline and a second pipeline are arranged at the upper end of the powder storing box; the first pipeline is connected with an exhaust fan; a porous partition plate is arranged in the first pipeline; the second pipeline extends into the powder storing box,and the lower portion of the second pipeline is provided with a vibration screen; a first diffuse reflection sensor and first glass are arranged on the positions, at the lower end of the vibration screen, of the side walls of the powder storing box correspondingly; electromagnetic attraction devices are arranged at the bottom of the powder storing box; a third pipeline is arranged between the powder storing box and the powder leaking box, and a first electronic control valve is arranged on the third pipeline; a second diffuse reflection sensor and second glass are arranged in the powder leaking box; a second electronic control valve is arranged at the bottom of the powder leaking box; and a raw material bag is arranged at the other end of the second pipeline, and a consumable frame is arranged at the bottom of the raw material bag. Automatic feeding can be achieved, meanwhile, quantitative powder leaking is achieved, powder can be added in the machining process, the phenomenon that thepowder in the powder storing box is insufficient, and consequently, shaping is stopped is avoided, trouble of manually adding powder into the powder storing box is reduced, and the automation degreeis high.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to a feeding device for 3D printing. Background technique [0002] The SLS method uses infrared lasers as the energy source, and the molding materials used are mostly powder materials. During processing, the powder is first preheated to a temperature slightly lower than its melting point, and then the powder is flattened under the action of a scraping stick; the laser beam is in the Under computer control, selective sintering is carried out according to the layered section information. After one layer is completed, the next layer is sintered. After all sintering is completed, the excess powder is removed, and a sintered part can be obtained. The current mature process material is Wax powder, plastic powder, ceramic and metal powder. [0003] Existing 3D printers usually have a powder storage box for storing powder raw materials. During the sintering operation, the powder is leaked from t...

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Problems solved by technology

[0003] Existing 3D printers usually have a powder storage box for storing powder raw materials. During the sintering operation, the powder is leaked from the powder storage box, and then the powder is spread by the powder spreading device before selective laser sintering. Add powder to the powder storage box many times. Usually, the volume of the powder storage box is designed to be large, which increases the overall volume of the equipment. In a sealed state, powder can no longer be added to the powder storage box to avoid pollution caused by the outflow of internal gas, so a feeding device that can reduce the overall volume and real-time feeding is required

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