随着综采工作面的发展，采煤机的自动调高技术是实现综采自动化核心技术之一。调高液压系统是采煤机调高系统的重要组成部分，其工作状态制约着采煤机的正常运行，目前传统的采煤机在调高时受到外界负载的冲击，无法精确控制和调整流量，以至于调高效率低且无法准确控制滚筒的升降过程，为解决这一问题，研究出稳定可靠的液压系统就显得尤为重要。本文完成的主要工作如下： 以MG750/1910-WD型滚筒釆煤机为对象，分析了采煤机结构及工作特点，根据调高液压系统的结构和原理，分析了负载对液压系统的影响，建立了滚筒中心高度与油缸活塞杆位置的数学关系；对以普通电磁换向阀为核心的调高液压系统进行了建模，对系统油缸活塞杆的位移和负载扰动下的速度响应进行了仿真；依据仿真结果揭示基于电磁阀调高系统存在的波动问题，替换电磁阀改为电液比例换向阀对调高液压系统进行改进，对电液比例阀元件进行结构分析，建立数学模型和仿真模型以验证其合理性，并对改进后的液压系统进行建模，与电磁阀控制的调高系统仿真结果进行对比，结果表明改进后的系统在响应速度方面有所提高；采用基于遗传算法原理对PID控制器进行参数整定，对电液比例调高液压系统进行优化，得出加入PID控制环节能使系统动态性能得到进一步提升，能够达到预期目标。 本文的研究为改进采煤机调高液压系统的性能提供了理论依据，为解决采煤机自动调高具有积极意义。

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 a theoretical basis for solving the shearer automatic increase of positive significance.