Intelligent Mining Technology for an Underground Metal Mine Based on Unmanned Equipment

This article analyzes the current research status and development trend of intelligent technologies for underground metal mines in China, where such technologies are under development for use to develop mineral resources in a safe, efficient, and environmentally friendly manner. We analyze and summarize the research status of underground metal mining technology at home and abroad, including some specific examples of equipment, technology, and applications. We introduce the latest equipment and technolo- gies with independent intellectual property rights for unmanned mining, including intelligent and unmanned control technologies for rock-drilling jumbos, down-the-hole （DTH） drills, underground scrapers, underground mining trucks, and underground charging vehicles. Three basic platforms are used for intelligent and unmanned mining： the positioning and navigation platform, information-acquisition and communication platform, and scheduling and control platform. Unmanned equipment was tested in the Fankou Lead-Zinc Mine in China, and industrial tests on the basic platforms of intelligent and unmanned mining were carried out in the mine. The experiment focused on the intelligent scraper, which can achieve autonomous intelligent driving by relying on a wireless communication system, location and navigation system, and data-acquisition system. These industrial experiments indicate that the technol- ogy is feasible. The results show that unmanned mining can promote mining technology in China to an intelligent level and can enhance the core competitive ability of China＇s mining industry.

Enhanced Adhesion Properties of Polymer-Metal Interfaces via Nano-injection Molding: A Study on Molecular Kinematic Mechanisms

Nano-injection molding enables the formation of nano-scale anchors to connect heterogeneous material surfaces to achieve the required mechanical properties.In this work,polyphenylene sulfide(PPS),aluminum(Al),copper(Cu),and iron(Fe)were selected as candidate polymer and metal materials.Three kinds of polymer-metal interfacial models with pyramidal nano-slots were modeled.The molecular dynamics simulations were launched to investigate the adhesion properties and molecular kinematic mechanisms of heterogeneous interfaces in nanoinjection molding.Results showed that the wall-slipping behavior of PPS at the interface slot was obvious,it was easy to form multiple-anchorpoints in the central area of substrates,and these anchor points were easily slipping along the wall,different from the de Gennes model.The atomic lattice and atomic band gap of metal affected the adhesion strength.The BCC lattice of Fe was more suitable for nano-injection molding process than the FCC lattice of Al and Cu.The filling rate,interfacial energy,the tensile and shear failures data revealed that the interfacial adhesion performances decreased according to the following order,Fe-PPS,Cu-PPS and Al-PPS components,respectively,and the interface failure mode was closely related to the stress loading mode.