1Global Detection of Deformation in Underground Coal Mine Tunnels Based on 3D Laser Scanning TechnologyXU JuanDesign and Research1-62Adaptive Backstepping Control of Hydraulic Cylinder for Mining Hydraulic SupportHAN ZhangmingDesign and Research7-113Braking Energy Recovery Technology of Electric Vehicle in Coal MineQI HongDesign and Research12-174Development and Engineering Practice of Multi-point Closed Sampling Device for Coal Mine Underground DrillingDU Kun, GUO KunmingDesign and Research18-22,325Development Status and Trends of High Power and High Mining Height Coal Winning Machines at Home and AbroadWANG GuangDesign and Research23-266Design of Fully Automatic Batch Testing System for Mechanical Characteristics of Mining Rubber ProductsXU Yuan, JIN XinDesign and Research27-327Calibration Method of Hard Coal Rock Particle Model ParametersHUANG Qiulai, JIANG NingIssue Discussion33-36,448Design of the Self-moving Machine Tail Driven by the Power Source of the Anchor ExcavatorWANG Xiang, NIE Yunhui, MA LiIssue Discussion37-409Discussion on the Voltage Drop Problem of Long-distance Power Supply for Coal Winning MachinesZHU Hongqiang, LÜ Xiao, WANG YanIssue Discussion41-4410Application of Thermal Spraying Technology in Spray Water Supply Pipe in Coal Winning MachineLU YunpengIssue Discussion45-4711Cutting Head Position Control of Boom Roadheader Based on SOA-PID Control AlgorithmCUI RenjieIssue Discussion48-5212Effect of Different Working Conditions on the Friction Performance of Friction-enhancing Grease Based on the Arc-plane MethodZHANG Jiabing, LIAO Jiaxin, LIU Chunlei, LI Xiaohui, JIANG Fei, CHEN Gang, PAN Chuyuan, XU Jun, XU Wei, TAO WeiIssue Discussion53-57,6513Design of Ultra-large Diameter Spiral Drum of Coal Winning MachineTAO RongTechnical Practice58-6014Non-destructive Testing Method for Underground Mechanical Equipment in Coal Mines Based on Infrared Temperature Measurement TechnologyJIN XudongTechnical Practice61-6515Analysis of Factors Affecting the Quality of Flameproof Enclosures for Mining ProductsLI MeixiangTechnical Practice66-6916Design and Application of Multi-level Collision Avoidance System for Mining Trackless Rubber Wheeled VehiclesWANG Rui, LIU Daoyuan, REN Yuanfei, ZHANG PingTechnical Practice70-7317Design of Comprehensive Test Bench for Coal Winning MachineHONG Meijuan, LI YaoyaoTechnical Practice74-77 