Current situation and intelligent development trend of high power liquid supply system of hydraulic support

The liquid supply system of coal face in underground coal mine provides high pressure and large flow hydraulic power for hydraulic support, and its performance and reliability are the key to the safe, intelligent and efficient work of fully mechanized mining equipment. In order to further ensure the safety of coal face support and ensure the following speed of hydraulic support, summarizing the development status of liquid supply system and refining the key technology requirements and development direction of intelligent liquid supply system is the primary link to realize the performance improvement of high-power liquid supply system. Based on the background of high power and intelligent development of hydraulic support liquid supply system, the configuration and working principle of high power liquid supply system of hydraulic support are systematically summarized and analyzed, and the pressure stabilization control methods of various pump control and valve control configurations are discussed and compared. Focusing on the requirements of pressure and flow continuous control of high-power liquid supply system, the characteristics of pilot drive, structural principle and working parameters of high-pressure, large-flow and high-water-based proportional unloading valves and proportional flow valves in related studies are analyzed and compared, and the key and difficult points in high-pressure, large-flow and high-water-based continuous control valve are pointed out. Aiming at the modeling of power transfer link and pressure stabilization control method of long pipeline supporting accurate control of liquid supply on demand, the practical significance of unsteady flow mechanical modeling method of long pipeline of hydraulic support is discussed, and the pressure stabilization control strategy and method of strong time-varying liquid supply system oriented to periodic composite action of hydraulic support are summarized and compared. Focusing on the requirements of system security and reliability assurance, the research status of intelligent operation and maintenance technology of liquid supply system including monitoring and diagnosis is reviewed. Focusing on the reliable and efficient application requirements of fully mechanized mining face and the frontier of intelligent technology of high water-based hydraulic system, the theoretical bottleneck restricting the breakthrough of control performance of liquid supply system is analyzed, and the shortcomings of key technology research and development of high power liquid supply system are summarized comprehensively. The necessity of improving the control performance and reliability from the component and system level to support the intelligent development of the liquid supply system of high-power hydraulic support is discussed, and the future technical development direction of the liquid supply system of hydraulic support is put forward.