2results about How to "Solve the problem of adding" patented technology

This invention discloses a retractable multi-material 3D printing head, which includes an extrusion structure, a first feeding structure, a second feeding structure, and a third feeding structure. By connecting the three feeding structures with one extrusion structure, the extrusion retraction problem in 3D printing of multiple materials is solved. The extrusion structure has three meshing screws, resulting in high mixing efficiency during slurry mixing. Simultaneously, each of the three feeding structures has a screw, allowing for better control of the amount of high-viscosity material added to the extrusion structure. Furthermore, the three screws inside the extrusion structure are specially designed irregular-shaped screws. While achieving conventional mixing, they not only better control the material extrusion amount but also work together with the screws in the feeding structures to achieve slurry retraction when printing high-viscosity materials, improving the forming effect and allowing for a wider solid content range in the formed ceramic slurry.

The application belongs to the technical field of agriculture, and particularly relates to a selenium-rich and cadmium-reducing fertilization method based on root-leaf cooperation and application thereof. The fertilization method comprises the following steps: before flower bud stage, burying soil conditioner; during spring shoot stage and / or flower bud stage, fruit bulking stage and color changing stage, spraying selenium-rich foliar fertilizer; by combining the specific soil conditioner and the selenium-rich foliar fertilizer, the root-leaf cooperation solves the problems of soil acidification and selenium element addition in the process of fruit tree planting, improves fruit quality, increases organic selenium content, and improves total flavonoid content in the fruit. The fertilization method is particularly suitable for the planting of citrus, grapefruit and other fruit trees.