Research On Hydraulic Control System Of Shearer Automatic Height

With the development of mechanized mining face of automation, automatic increase Shearer is one of the core technology of mechanized mining automation. Increase the hydraulic system is an important part of Shearer system, which restricts the normal increase in working condition runs Shearer, Shearer current impact outside the traditional load when raised, can not be accurately controlled and adjust the flow, as well as increase the efficiency of low and can not be accurately controlled shearer drum lifting process, developed to solve this problem for a stable and reliable hydraulic system is particularly important. The main work is completed as follows:In this paper, electronic traction roller preclude MG750/1910-WD coal as an object,analyzes the structure and operating characteristics of shearer, according to the structure and principles to increase the hydraulic system, the influence of the disturbance on the hydraulic system, the establishment of a roll center height and mathematical relationship cylinder piston rod position; on the hydraulic system to raise the general solenoid valve core is modeled on the cylinder rod displacement speed of the system and load disturbance responses were simulated; based on the simulation results revealed based on the presence of the solenoid valve adjusting system fluctuation problem, replace the solenoid valve was changed to increase the proportion of electricity valve system improvements to the electro-hydraulic proportional valve element structural analysis, mathematical models and simulation models to verify their reasonable resistance, and improved hydraulic system modeling, simulation results and increase the solenoid valve control were compared, the results show that the improved system has improved in terms of response speed; based on the principle of genetic algorithm PID controller parameter tuning of the electro-hydraulic proportional increase in the hydraulic system optimization, come join the PID control link enables the system to further enhance dynamic performance, to achieve the desired objectives.This study is to improve the performance of Shearer hydraulic system provides atheoretical basis for solving the shearer automatic increase of positive significance.