采煤机自动调高液压控制系统研究
发布时间：2018-08-27 19:14
【摘要】：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型滚筒懫煤机为对象,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。
[Abstract]:With the development of fully mechanized mining face, automatic height adjustment technology of shearer is one of the core technologies to realize automation of fully mechanized coal mining. The hydraulic system is an important part of the height regulation system of the shearer. Its working state restricts the normal operation of the shearer. At present, the traditional shearer is impacted by the external load when the height is adjusted, so it is unable to accurately control and adjust the flow rate. In order to solve this problem, it is very important to develop a stable and reliable hydraulic system. The main work accomplished in this paper is as follows: taking MG750/1910-WD type drum coal machine as the object, the structure and working characteristics of the shearer are analyzed, and the influence of load on the hydraulic system is analyzed according to the structure and principle of the hydraulic system. The mathematical relationship between the center height of the cylinder and the position of the piston rod of the cylinder is established, and the hydraulic system with the common electromagnetic directional valve as the core is modeled, and the displacement of the piston rod of the cylinder and the velocity response under the load disturbance are simulated. Based on the simulation results, it is revealed that based on the fluctuation of the solenoid valve height regulation system, the electro-hydraulic proportional directional valve is replaced by the electro-hydraulic proportional directional valve to improve the hydraulic system, and the structure of the electro-hydraulic proportional valve component is analyzed. The mathematical model and simulation model are established to verify its rationality, and the improved hydraulic system is modeled and compared with the simulation results of the solenoid valve control system. The results show that the improved system improves the response speed. Based on genetic algorithm (GA), the parameters of PID controller are adjusted, and the electro-hydraulic proportional hydraulic system is optimized. It is concluded that the dynamic performance of the system can be further improved by adding PID control link, and the expected goal can be achieved. The research in this paper provides a theoretical basis for improving the performance of the hydraulic system for height adjustment of shearer and has positive significance for solving the automatic height adjustment of shearer.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD632
本文编号：2208189
[Abstract]:With the development of fully mechanized mining face, automatic height adjustment technology of shearer is one of the core technologies to realize automation of fully mechanized coal mining. The hydraulic system is an important part of the height regulation system of the shearer. Its working state restricts the normal operation of the shearer. At present, the traditional shearer is impacted by the external load when the height is adjusted, so it is unable to accurately control and adjust the flow rate. In order to solve this problem, it is very important to develop a stable and reliable hydraulic system. The main work accomplished in this paper is as follows: taking MG750/1910-WD type drum coal machine as the object, the structure and working characteristics of the shearer are analyzed, and the influence of load on the hydraulic system is analyzed according to the structure and principle of the hydraulic system. The mathematical relationship between the center height of the cylinder and the position of the piston rod of the cylinder is established, and the hydraulic system with the common electromagnetic directional valve as the core is modeled, and the displacement of the piston rod of the cylinder and the velocity response under the load disturbance are simulated. Based on the simulation results, it is revealed that based on the fluctuation of the solenoid valve height regulation system, the electro-hydraulic proportional directional valve is replaced by the electro-hydraulic proportional directional valve to improve the hydraulic system, and the structure of the electro-hydraulic proportional valve component is analyzed. The mathematical model and simulation model are established to verify its rationality, and the improved hydraulic system is modeled and compared with the simulation results of the solenoid valve control system. The results show that the improved system improves the response speed. Based on genetic algorithm (GA), the parameters of PID controller are adjusted, and the electro-hydraulic proportional hydraulic system is optimized. It is concluded that the dynamic performance of the system can be further improved by adding PID control link, and the expected goal can be achieved. The research in this paper provides a theoretical basis for improving the performance of the hydraulic system for height adjustment of shearer and has positive significance for solving the automatic height adjustment of shearer.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD632
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