1.School of Mechanical Engineering,Xi’an University of Science and Technology,Xi’an ,China;2.Shenmu Ningtiaota Mining Company Limited，Shaanxi Coal and Chemical Industry Group Co.,Ltd.,Shenmu ,China

According to the problems of gas and dust explosion and the rising risk of environmental pollution caused by the lack of dynamic changes of the duct outlet caliber,the angle of deflection and the distance from heading face,the intelligent control device of air flow installed in the outlet of ventilation duct was developed.Based on the analysis of actual movement and distribution laws of air flow,the overall structure scheme of intelligent control device was established,the detailed design of mechanical structure and the optimization analysis of safety were carried out,besides,the software and hardware of the control system were analyzed and designed.The test results show that the wind speed along the return air side decreases from 4.01m/s to 1.19 m/s and the wind speed at driver’s position increases from 0.1 m/s to 0.5 m/s when the air outlet is 7 m away from the end.When the air outlet is 5 m and 10 m away from the end,the dust concentration of driver's breathing belt height is 34% lower than that of original dust field,which indicates that the air regulation and dust reduction effect of the control device is obvious and has good practical value.