2results about How to "Spread powder evenly" patented technology

This invention discloses a toner ejection mechanism for a 3D printer, including a mounting frame. The mounting frame has a toner storage tank for storing printing material. A top plate assembly, capable of ejecting printing material from the toner storage tank, is slidably mounted within the tank. Each side of the bottom of the top plate assembly is connected to a push rod that moves the top plate assembly up and down relative to the mounting frame. The mounting frame is equipped with a drive device and a transmission device, driven by the drive device, to synchronously move the two push rods up and down. This invention uses a single drive device to drive the transmission device, which in turn drives the two push rods synchronously, ensuring the synchronicity of their movements and improving the reliability and durability of the mechanism. The amount of toner ejected by the top plate assembly is consistent with the amount of toner stored when the top plate assembly retracts, resulting in uniform toner distribution by a single scraper at a fixed toner volume, reducing unnecessary material consumption.

This invention proposes a spherical polylactic acid (PLA) powder with a wide sintering window, its preparation method, and its application. The preparation method includes the following steps: S1, mixing a poor solvent and PLA granules, adding the mixture to a reaction vessel, stirring, first heating, then holding at that temperature; S2, then cooling to 100-118°C, holding at that temperature for 30-60 minutes; S3, removing the product, washing and drying the product to obtain the spherical PLA powder. This invention is based on thermally induced phase separation, adding a spheroidization step to increase the crystallinity and sphericity of the PLA powder. The prepared spherical PLA powder has a particle size distribution of 10-120 μm and a bulk density of 0.3-0.45 g / cm³. 3 The powder possesses high fluidity, a wide sintering window, and excellent sintering performance, while retaining the excellent greenness and biocompatibility of polylactic acid. PLA parts formed by LPBF printing using the spherical PLA powder prepared in this invention exhibit good mechanical properties.