1Overview and Prospect of Visual Detection Methods for Underground Unsafe Behaviors in ChinaHU Wenyuan, ZHAI Yusheng, YUN Ruiguang, SONG Xiangkun, YIN YuxiDesign and Research1-72Research on Autonomous Navigation of Coal Mine Mobile Robot Based on Multi-sensor Data FusionXU Weifeng, JIN Xiangyang, ZHANG Liping, JIN YuquanDesign and Research8-123Implementation of Helmet Recognition Based on Intrinsic Safety Camera External Al TerminalREN WeiDesign and Research13-174Design and Construction of Intelligent Coal Flow SystemNIE YunhuiDesign and Research18-235Development of A Closed-loop Intelligent Coal Sample Collection System Based on AGV Handling RobotWU Zengli, YIN ChengDesign and Research24-276Research on Dynamic Error Compensation Method for MEMS AccelerometersYAN Peiyu, ZHANG HaiqingIssue Discussion28-337Design and Application of Mining TBM Efficient Support Technology and Safety Protection DeviceWANG Yong, GU Changju, HE Fei, JI Panjun, LI Chaojie, LI TongxiangIssue Discussion34-418Robotization Technology Transformation and Key Issues of the Hammer Forging Production Line for Scraper Forgings in Coal MinesYE Yang, WANG AimingIssue Discussion42-479Research and Application of Key Techno-log-ies for Shendong High Efficiency Thin Coal Seam ShearerQUAN Baochao, GAO Zhenbang, LI QingliangIssue Discussion48-5110Research on the Anti-vibration Performance of the Electric Control System of Coal Mining MachineWEI HongqingIssue Discussion52-5511Research on the Rated Working Resistance of the Support in the Working Face Under Thick Impact Layer and Thin BedrockKANG JunIssue Discussion56-5912Experimental Study on Sensing Technology of Trackless Rubber Wheeled Vehicle Tunnel in Coal Mine UndergroundCHEN Xiangyuan, LI XingIssue Discussion60-6313Design and Application of Centralized Grease Injection System for Coal Mining MachinesQIAN ZhuangzhuangTechnical Practice64-6614Analysis of Explosion Pressure and Its Influencing Factors of Flameproof ShellZHANG YajunTechnical Practice67-7015Development of Coal Mining Machine Rocker Arm Displacement MachineWEI WenyuTechnical Practice71-73,7916High Yield Conditions and Key Points for Selecting Shearers in Medium Thick Coal Seam Working FacesDOU Yuning, HU JunTechnical Practice74-7617Design of the Self-lubricating System for the Bearing Seat of the Auxiliary Pump Unit of the Tunnel Drilling RigLü MengTechnical Practice77-79 