發(fā)布時(shí)間：2018-08-27 19:14

【摘要】：隨著綜采工作面的發(fā)展,采煤機(jī)的自動(dòng)調(diào)高技術(shù)是實(shí)現(xiàn)綜采自動(dòng)化核心技術(shù)之一。調(diào)高液壓系統(tǒng)是采煤機(jī)調(diào)高系統(tǒng)的重要組成部分,其工作狀態(tài)制約著采煤機(jī)的正常運(yùn)行,目前傳統(tǒng)的采煤機(jī)在調(diào)高時(shí)受到外界負(fù)載的沖擊,無(wú)法精確控制和調(diào)整流量,以至于調(diào)高效率低且無(wú)法準(zhǔn)確控制滾筒的升降過(guò)程,為解決這一問(wèn)題,研究出穩(wěn)定可靠的液壓系統(tǒng)就顯得尤為重要。本文完成的主要工作如下:以MG750/1910-WD型滾筒懫煤機(jī)為對(duì)象,分析了采煤機(jī)結(jié)構(gòu)及工作特點(diǎn),根據(jù)調(diào)高液壓系統(tǒng)的結(jié)構(gòu)和原理,分析了負(fù)載對(duì)液壓系統(tǒng)的影響,建立了滾筒中心高度與油缸活塞桿位置的數(shù)學(xué)關(guān)系;對(duì)以普通電磁換向閥為核心的調(diào)高液壓系統(tǒng)進(jìn)行了建模,對(duì)系統(tǒng)油缸活塞桿的位移和負(fù)載擾動(dòng)下的速度響應(yīng)進(jìn)行了仿真;依據(jù)仿真結(jié)果揭示基于電磁閥調(diào)高系統(tǒng)存在的波動(dòng)問(wèn)題,替換電磁閥改為電液比例換向閥對(duì)調(diào)高液壓系統(tǒng)進(jìn)行改進(jìn),對(duì)電液比例閥元件進(jìn)行結(jié)構(gòu)分析,建立數(shù)學(xué)模型和仿真模型以驗(yàn)證其合理性,并對(duì)改進(jìn)后的液壓系統(tǒng)進(jìn)行建模,與電磁閥控制的調(diào)高系統(tǒng)仿真結(jié)果進(jìn)行對(duì)比,結(jié)果表明改進(jìn)后的系統(tǒng)在響應(yīng)速度方面有所提高;采用基于遺傳算法原理對(duì)PID控制器進(jìn)行參數(shù)整定,對(duì)電液比例調(diào)高液壓系統(tǒng)進(jìn)行優(yōu)化,得出加入PID控制環(huán)節(jié)能使系統(tǒng)動(dòng)態(tài)性能得到進(jìn)一步提升,能夠達(dá)到預(yù)期目標(biāo)。本文的研究為改進(jìn)采煤機(jī)調(diào)高液壓系統(tǒng)的性能提供了理論依據(jù),為解決采煤機(jī)自動(dòng)調(diào)高具有積極意義。
[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.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD632

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