Abstract:
In response to the common problems in the traditional spraying and filling material transportation processes in underground coal mines, such as discontinuous processes, redundant transfer links, high reliance on manual labor, poor stability during long-distance transportation, and high maintenance costs, which lead to a vicious cycle of "excavation first, repair later, repeated instability" and exacerbate the tension in the connection between mining and excavation, through analyzing the current demand for intelligent transportation in underground mines, a green and intelligent pneumatic transportation system for long-distance transportation between the surface and the underground was developed based on domestic technology. This system adopts a three-level modular architecture of "ground station‒transfer station‒workstation", combined with multi-level pressure dynamic compensation mechanism and optimized technology for dilute-phase gas-solid two-phase flow, achieving efficient and sealed transportation of dry-mixed materials over extremely long distances. Through precise metering of premixed materials and the end spraying process, the material gradation and uniformity of mixing are optimized, significantly reducing the rebound rate of spraying. Relying on industrial Ethernet and 5G dual-mode communication technology, a remote collaborative control platform integrating real-time monitoring, dynamic path planning, and intelligent equipment diagnosis was constructed, forming a three-level regulation and transportation system of "surface storage‒underground pressurization‒mobile terminal". The application results of Luan Xing Yuan Coal Industry show that compared with the traditional rubber-wheel vehicle transportation method, this system increases the annual spraying volume by 106%, reduces the total cost by 41.2%, decreases the number of workers per working face by 80%, and also has the advantages of full enclosure, low energy consumption, and less manpower. This system is the first to achieve 100% domestic equipment integration, providing an innovative solution for intelligent support and green, safe, and efficient production in long-distance coal mining in coal mines.