Research and Development of Virtual Prototype for Intelligent Control of Airflow Field in Fully Mechanized Heading Face

Abstract

In view of the fact that gas and dust accumulation with rapid excavation and the increase of pollution risk in the fully mechanized heading face, while the traditional tunneling ventilation system does not have the real-time dynamic regulation function for the airflow, an intelligent control device for the airflow field installed on the duct outlet was developed, it can provide individualized service for different coal mine heading face. The airflow field regulation requirements for the optimal migration of airflow, dust and gas were analyzed. Considering the different factors of the full life cycle for the prototype, the overall scheme of the airflow intelligent regulation virtual prototype was determined. The finite element analysis and optimization of the mechanical structure safety and economy were carried out, and the hardware and software of the intelligent control system were carried out; the virtual prototype 3D solid model was established, and the kinematics simulation analysis was carried out to verify the performance of accessibility and feasibility. The airflow control device for underground measurement was developed and the control effect test was carried out. The results show that the wind speed at 5 m away from the duct outlet to the heading face was decreased from 4.7 m/s to 1.6 m/s, and the wind speed at 10m was increased from 0.1 m/s to 0.58 m/s, which meets the requirements of the Coal Mine Safety Regulations on the range of wind speed with 0.25-4 m/s range; the concentration of gas which accumulates in the upper corner was reduced by 54 % before controlling; the dust concentration at the driver’s position was reduced by 28.6 % before controlling. It has obvious regulatory effect, and it provides strong technical support for the purpose of safety and green ventilation in the fully mechanized heading face.