## 3 Application of 5G+ Big Data in Fully-Mechanized Mining Face with a Super-Large Mining Height
Technologies such as visualization, simulation, virtual-real interaction, perception, Internet of Things, and cloud computing have been applied to create a fully simulated model of the working face equipment, access massive amounts of data, and display equipment operation data, and support posture in real time. Through multi-view mode and roaming mode, the working face situation is restored from multiple angles, and the operation data of each piece of equipment in the working face is displayed, thereby aiding in the continuous optimization of the processes at the working face. The Harmony platform models the key underground areas and equipment, personnel, as well as safe production status, and achieves a seamless connection between production management and digital twin on-site management, which allows managers to grasp information more quickly. The subsystems of the fully-mechanized mining face have achieved  
Figure 8: Electro-hydraulic control and attitude monitoring system of support. Figure 9: Video monitoring system. linkage integration through the use of Internet of Things and industrial communication network technology, greatly improving the efficiency of production control, achieving lean production and cost reduction and efficiency improvement on the working face, and laying a solid technical foundation for the IoT interaction of future working face equipment. Automatic coal cutting system of shearer  
Automated coal cutting employs memory cutting techniques. The automated coal-cutting system of the shearer records parameters such as the drum rocker arm angle and traction speed, enabling it to automatically and repeatedly learn the cutter's drum trajectory. First, the relevant parameters of memory coal cutting are set, followed by the execution of the memory coal cutting process. A complete cycle of demonstration cutter learning is carried out starting from one end of the working face and completing a full cycle of coal cutting across the entire working face according to the actual coal mining process [42]. This can reduce the number of shearer drivers working in high-risk areas, decrease the labor intensity of operators, and help achieve the ultimate goal of \"safety through absence of personnel\" in underground coal mines, thereby providing high safety benefits. Centralized lubrication of three machines, centralized lubrication of shearer, and intelligent spray system  
The centralized lubrication system for the three machines adjusts the oil supply parameters through the mine control box, enabling single-point control and point-by-point monitoring of all lubrication points to meet the lubrication requirements. The system is composed of a pneumatic pump, mine control box, mine valve type oil feeder, and an oil supply pipeline, etc., to achieve precise lubrication of the three machine's lubrication points at a fixed time, fixed point, and fixed quantity. The centralized lubrication system for the shearer adjusts the oil supply parameters through the mine control box, enabling single-point control and point-by-point monitoring of all lubrication points to meet the lubrication requirements. The system is composed of a pneumatic pump, mine control box, mine valve type oil feeder, and an oil supply pipeline, etc., to effectively reduce the wear rate and failure rate of the shearer. The intelligent spray system transmits information to the controller through the vibration sensor. The controller then opens the valve to spray water for dust suppression, and the spray automatically stops when the equipment is turned off. The device consists of a controller, vibration sensor, control valve, and spray component, to effectively reduce the dust concentration on the working surface. The centralized control center is arranged at the tail of the self-moving machine of the fully-mechanized mining face, as shown in Figure 10. The control authority of the main equipment in the fully-mechanized mining face is transferred to the control center.