Research on air flow control device for excavating face
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摘要: 目前掘进工作面常用的通风总量控制方式难以动态调节风筒出风口风流，导致风量不足或风流分布不合理，造成瓦斯和粉尘积聚等安全隐患。以柠条塔矿S1200-Ⅲ掘进面为例，通过分析原始风场存在的问题及风流调控需求，设计了一种通过气压缸或气动马达驱动机械结构实现出风口偏转角度、口径大小及前后位移动态调节的气动式风流调控装置，介绍了该装置机械系统、气动执行系统和控制系统的设计方案。采用ANSYS Workbench软件对机械系统的安全性进行了有限元分析，结果为最大应力87.2 MPa，安全系数2.69，最大变形量0.84 mm，平均变形量0.42 mm。采用FluidSIM软件对气动执行系统进行了仿真分析，结果表明装置可完成既定动作，且运行平稳、可靠。井下测试结果表明，采用该装置后，司机处与行人呼吸带风流分布更合理，在风筒出风口距工作面5 m时，司机处与行人呼吸带粉尘浓度较调控前分别降低了45.3%和33.4%，出风口距工作面10 m时分别降低了40.4%和34.3%。Abstract: At present, it is difficult to adjust the air flow at the outlet of the wind pipe dynamically by the total ventilation control method commonly used in the excavating face, resulting in insufficient air volume or unreasonable air flow distribution, and causing safety hazards such as gas and dust accumulation. Taking S1200-Ⅲexcavating face of Ningtiaota Mine as an example, by analyzing the problems of the original wind field and the requirements of wind flow control, the air flow control device is designed, which installed a mechanical structure driven by a pneumatic cylinder or a pneumatic motor. The device is able to realize the dynamic adjustment of outlet deflection angle, caliber size and front-back displacement. This paper introduces the design scheme of mechanical system, pneumatic actuation system and control system of the device. ANSYS Workbench software is used to conduct finite element analysis on the safety of the mechanical system. The results show that the maximum stress is 87.2 MPa, the safety factor is 2.69, the maximum deformation is 0.84 mm, and the average deformation is 0.42 mm. FluidSIM software is applied to simulate and analyze the pneumatic actuation system. The results show that the device can complete the predetermined action and run smoothly and reliably. Underground test results show that after adopting this device, the air flow distribution at the driver and pedestrian breathing zone height is more reasonable. When the air duct outlet is 5 m away from the working surface, the dust concentration at the driver and pedestrian breathing zone is reduced by 45.3% and 33.4% respectively compared with situation before the control. When the air outlet is 10 m away from the working face, the concentration is reduced by 40.4% and 34.3% respectively.
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