Beijing University of Technology

Beijing Roborock Technology Co., Ltd.

Beihang University

Beijing Cloud Profound Technologies Company Limited

Research Institute of Highway Ministry of Transport

Suzhou Pollypolymer New Material Technology Co., Ltd.

Lidong Zhao

Wei Liu

Min He

Lifang Wu

Meng Jian

Caiyun Hu

Xiaohua Guo

Ziming Zhang

Jiankang Qiu

Xiao Lin Zhang

Yuan Gao

Feng Yang

Yao Lu

Miao Yu

Dongwei Cao

Yisong Gao

Yanjun Zhang

Zechao Liu

Haiyan Zhang

Yuanzheng Shi

Chen Zhou

Yongjun Fan

Bingchao Qin

Zun Li

MingLi Xiang

Yandong Li

Zening Men

Wenbin Wang

Changling Wang

Zhidong Huang

Zun Ll

Yandong Ll

Yanju Chen

Mopping cloth for cleaning robot

Anti-collision part of mop holder for cleaning robot

A rapid DLP 3D printing control parameter optimization method combining continuous and layered molding includes the following steps: confirming the maximum printable distance of each slice by analyzing the printable area of the model slice. The liquid-liquid interface printing scene was further established, and the flow behavior of the resin between the printed object and the fluorinated oil after printing a layer of slices was simulated and recorded. Next, determine the printing mode of the current slice by slicing the maximum printable distance and numerical simulation model. Then, based on Poiseuille flow, Jacobs working curve and Lambert-Beer law, the resin curing time of continuous and layered printing, the maximum filling distance of continuous printing, the best lifting distance of layered printing, and the corresponding printing platform lifting of the two methods are expressed speed. Finally, camera monitoring is used to determine the print origin before printing starts. This method can achieve fast printing of any model by obtaining the optimal control parameters, while being portable and printable.

Rapid DLP 3D printing control parameter optimization method combining continuous and layered molding

The present disclosure relates to P-type SnSe crystal capable of being used as thermoelectric refrigeration material and a preparation method thereof. The material is a Na-doped and Pb-alloyed SnSe crystal. A molar ratio of Sn, Se, Pb and Na is (1-x-y):1:y:x, where 0.015&#x2264;x&#x2264;0.025 and 0.05&#x2264;y&#x2264;0.11. The P-type SnSe crystal provided by the present disclosure is capable of being used as the thermoelectric refrigeration material. A power factor PF of the P-type SnSe crystal at a room temperature is &#x2265;70 &#x3bc;WcmK, and ZT at the room temperature is &#x2265;1.2. A single-leg temperature difference measurement platform built on the basis of the obtained SnSe crystal may realize a refrigeration temperature difference of 17.6 K at a current of 2 A. The present disclosure adopts a modified directional solidification method and uses a continuous temperature region for slow cooling to grow a crystal to obtain the large-sized high-quality SnSe crystal.

P-type SnSe crystal capable of being used as thermoelectric refrigeration material and preparation method thereof

A model-adaptive multi-source large-scale mask projection 3D printing system configured to conduct the following steps: projecting pure-color images of first and second colors having identical attributes, capturing an image of an overlapping portion and calculating height and width information of the overlapping portion; splitting a pre-processed slice and respectively recording width and height information of two slices resulting from the splitting and generating two gray scale images having identical attributes thereto; counting power values of identical positions of slices in different gray scale values, performing a further calculation to obtain a projection mapping function, using the projection mapping function as a basis for performing optimization on gray scale interpolation of the generated images; and fusing the processed gray scale images and the originally split two slices to obtain a mask projection 3D printing slice having a uniform shaping brightness, and forming a final product.

Model-adaptive multi-source large-scale mask projection 3D printing system

A multi-degree-of-freedom (Multi-DOF) 3D printing device includes a printer mechanism, a rotatable platform, a visual inspection system, and a control system. The printing mechanism includes a print head. The printing mechanism and the rotatable platform are combined to have three degrees of freedom of translation, and the rotatable platform has two degrees of freedom of rotation. The visual inspection system includes a camera mounted to nearby the print head and the relative position of camera and print head remains constant. The control system is configured to implement the printing process. The model is decomposed into several components, each of which could be printed in a single direction. After one component is printed out, the platform is then rotated so that the cutting plane for the component will be printed is horizontal.

3D printing method and device with multi-axis mechanical system and visual surveillance

A light homogenization method for multi-source large-scale surface exposure 3D printing, comprising the following steps: projecting pure-color images of a first color and a second color having identical attributes capturing an image of an overlapping portion and calculating height and width information of the overlapping portion; splitting a pre-processed slice and respectively recording width and height information of two slices resulting from the splitting and generating two grayscale images having identical attributes thereto; counting power values of identical positions of slices in different grayscale values, performing a further calculation to obtain a projection mapping function, using the projection mapping function as a basis for performing optimization on grayscale interpolation of the generated images; and fusing the processed grayscale images and the originally split two slices to obtain a surface exposure 3D printing slice having a uniform brightness in final shaping.

Light homogenization method for multi-source large-scale surface exposure 3D printing

Growing community of inventors

Beijing, China

Lidong Zhao