Xi'an University of Architecture and Technology

Powerchina Northwest Engineering Corporation Limited

Dongying Hadong Industrial Technology Research Institute Co., Ltd.

Wei Liu

Lei Feng

Yue Zhao

Huidong Xie

Nan Chen

Zhongqiang Zhao

Yongshun Liu

Shuwu Li

Zhiteng Wang

Xiaoliang He

Youlin Wang

Zhixiang Zhao

Jian Bao

Jian Jiao

Chang Yang

Xiaoling Guo

Guanli Liu

Junheng Cao

Xiaoxia Xu

The present invention discloses a right-angle turning method for small-diameter TBM exploration adit excavation and belongs to the field of geological exploration of water conservancy and hydropower projects. The method includes the steps: excavating a main exploration adit with a small-diameter TBM to a designated position, and then enabling the small-diameter TBM to continue to excavate forward to a temporary parking place, and parking the small-diameter TBM there; expanding and excavating a turning workspace at a right-angle turning position, and assembling a rotary platform; pulling the TBM onto the rotary platform, then starting excavation after rotating the rotary platform to make the TBM move in a same direction as the branch exploration adit; and pulling the TBM onto the rotary platform after excavation of the branch exploration adit is completed, and then moving the TBM to an adit portal so as to complete excavation after rotating the rotary platform to make the TBM move in a same direction as the main exploration adit. The present invention effectively solves the problems that the small-diameter TBM can only excavate main exploration adits in geological exploration adits of underground powerhouses of hydropower projects and pumped storage projects, and cannot make right-angle turns and excavate branch adits of underground cavern groups. It effectively fills the blank of a traditional adit excavation adopting blasting technology; and the excavation efficiency is high, the working environment is friendly, and safety production is guaranteed.

Right-angle turning method for small-diameter TBM exploration adit excavation

A solvent-free and ligand-free ball milling method for preparation of cesium lead tribromide (CsPbBr) quantum dot is provided. First, mixing a Cs source, a Pb source, and a Br source as per a molar ratio of Cs source:Pb source:Br source is 1:1˜6:1˜9, and then adding polymethyl methacrylate (PMMA) to obtain a mixture. The mixture is milled for 1-2 hours at a rotation speed in a range of 360˜630 revolutions per minute (r/min) in a ball milling device, obtaining CsPbBrquantum dot. The method has advantages such as simple process, easy industrial production, no solvent, no organic ligand, low cost, and environmental protection. A quantum yield of product obtained by the method is up to 78%, and the product has a strong environmental stability. A preparation temperature of the product is low, and the reaction can be completed at a room temperature without a high temperature treatment.

Solvent-free and ligand-free ball milling method for preparation of cesium lead tribromide quantum dot

Growing community of inventors

XI'AN, China

Wei Liu