本文關(guān)鍵詞： 采煤機(jī) 液壓制動(dòng) 動(dòng)態(tài)特性 AMESim　出處：《太原科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：采煤機(jī)是現(xiàn)代煤礦綜采生產(chǎn)中主要的設(shè)備,是煤礦“三機(jī)”中必不可少的裝備,在煤礦生產(chǎn)中起不可替代的作用。因?yàn)槊旱V井下環(huán)境惡劣,工況復(fù)雜,采煤機(jī)液壓制動(dòng)系統(tǒng)的優(yōu)劣會(huì)影響到煤礦工人的生命安全、采煤機(jī)自身的安全性以及作業(yè)的可靠性�，F(xiàn)在針對(duì)于采煤機(jī)液壓制動(dòng)系統(tǒng)的研究比較少,大多以理論研究居多,缺乏深入的研究,因此研究采煤機(jī)液壓制動(dòng)系統(tǒng)具有重要意義。本文以太重集團(tuán)煤機(jī)有限公司生產(chǎn)的MG750/1940-WD型采煤機(jī)液壓制動(dòng)系統(tǒng)為研究對(duì)象,針對(duì)采煤機(jī)在大傾角面工作時(shí)制動(dòng)下滑的現(xiàn)象,進(jìn)行了理論分析,對(duì)采煤機(jī)在大傾角面工作時(shí)的受力情況進(jìn)行了受力分析,通過分析計(jì)算出了采煤機(jī)的制動(dòng)安全系數(shù),提出了評(píng)判采煤機(jī)制動(dòng)性能的各項(xiàng)指標(biāo),綜合分析得出影響采煤機(jī)下滑的原因是制動(dòng)響應(yīng)時(shí)間過長。為了分析制動(dòng)響應(yīng)時(shí)間對(duì)采煤機(jī)制動(dòng)性能的影響,對(duì)可能影響制動(dòng)響應(yīng)時(shí)間的因素進(jìn)行逐個(gè)分析。具體方法是:對(duì)采煤機(jī)制動(dòng)系統(tǒng)進(jìn)行了模型簡化,并對(duì)簡化的模型進(jìn)行了數(shù)學(xué)建模,通過數(shù)學(xué)模型分析了制動(dòng)系統(tǒng)各元件之間因果關(guān)系。在此基礎(chǔ)上利用AMESim仿真軟件對(duì)影響制動(dòng)響應(yīng)時(shí)間的各種因素進(jìn)行了仿真驗(yàn)證。具體方法是:根據(jù)建立的制動(dòng)系統(tǒng)數(shù)學(xué)模型,在AMESim仿真分析軟件中建立了關(guān)鍵元件以及制動(dòng)系統(tǒng)的仿真模型,為每個(gè)元件設(shè)置相應(yīng)的參數(shù),研究制動(dòng)器彈簧剛度、制動(dòng)器彈簧預(yù)緊力、油液中空氣含量、液壓管路內(nèi)徑、電磁換向閥閥口通流截面積以及液壓管路長度對(duì)制動(dòng)響應(yīng)時(shí)間的影響。通過仿真得出:連接制動(dòng)器和油箱之間的管路會(huì)影響制動(dòng)響應(yīng)時(shí)間,管路內(nèi)徑越大管路越長制動(dòng)響應(yīng)時(shí)間也越長,但管路內(nèi)徑不易過小,小于8mm時(shí)阻力過大,導(dǎo)致制動(dòng)時(shí)間過長;制動(dòng)器彈簧剛度不會(huì)對(duì)制動(dòng)響應(yīng)時(shí)間產(chǎn)生影響,而起作用的是制動(dòng)彈簧預(yù)緊力;油液中空氣含量超過0.5%也會(huì)影響制動(dòng)響應(yīng)時(shí)間;電磁閥口截面積越小制動(dòng)響應(yīng)時(shí)間越長。因此,應(yīng)設(shè)計(jì)合理的管路長度和內(nèi)徑,選擇合適的電磁換向閥以及避免油液中混入過多的空氣,來達(dá)到提高制動(dòng)響應(yīng)時(shí)間的目的,從而提高制動(dòng)性能。
[Abstract]:The shearer is the main equipment in the comprehensive mining production of modern coal mine, is the indispensable equipment in the "three machines" of the coal mine, and plays an irreplaceable role in the coal mine production, because the underground environment of the coal mine is bad and the working condition is complex, The merits and demerits of hydraulic braking system of shearer will affect the life safety of coal miners, the safety of shearer itself and the reliability of operation. Because of the lack of in-depth research, it is of great significance to study the hydraulic braking system of shearer. In this paper, the hydraulic braking system of MG750/1940-WD type shearer produced by Taizhong Group Coal Machine Co., Ltd is taken as the research object. Aiming at the phenomenon of braking sliding when the shearer is working on a large inclined plane, this paper makes a theoretical analysis, and analyzes the force acting on the shearer when the shearer is working on a large inclined plane, and calculates the braking safety factor of the shearer by analyzing and calculating. In order to analyze the influence of braking response time on the braking performance of shearer, it is concluded that the braking response time is too long. The factors that may affect the braking response time are analyzed one by one. The specific methods are as follows: the model of the braking system of the shearer is simplified, and the simplified model is modeled mathematically. The causality between the components of braking system is analyzed by mathematical model. On the basis of this, various factors affecting braking response time are verified by AMESim simulation software. The specific method is: according to the established mathematical model of braking system, The simulation model of key components and braking system is established in AMESim software. The corresponding parameters are set up for each component. The stiffness of brake spring, the pretightening force of brake spring, the air content in oil and the inner diameter of hydraulic pipe are studied. The influence of electromagnetic directional valve orifice cross section area and hydraulic pipe length on braking response time. Through simulation, it is concluded that the connection between brake and fuel tank will affect the braking response time. The larger the inner diameter of the pipe, the longer the braking response time, but the inner diameter of the pipe is not easy to be too small, the resistance is too large when the diameter is less than 8 mm, the braking time is too long, and the brake spring stiffness will not affect the braking response time. The brake spring pretightening force is acting; the air content in the oil over 0.5% will also affect the braking response time; the smaller the section area of the solenoid valve, the longer the braking response time. Therefore, reasonable pipe length and inner diameter should be designed. Choosing proper electromagnetic reversing valve and avoiding too much air in the oil can increase the braking response time and improve the braking performance.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD421.6

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本文編號(hào)：1552132