【摘要】：前輪驅(qū)動(dòng)技術(shù)是現(xiàn)代平地機(jī)提高牽引性能的重要手段之一,通過(guò)充分利用前輪附著質(zhì)量,可以提高整機(jī)的有效牽引力,從而提高平地機(jī)的作業(yè)效率,擴(kuò)大平地機(jī)的使用范圍,尤其是礦區(qū)等對(duì)大型平地機(jī)有需求的特殊場(chǎng)合。目前對(duì)平地機(jī)前輪驅(qū)動(dòng)技術(shù)的綜合性研究依然存在局限性,因此,圍繞著系統(tǒng)方案設(shè)計(jì)、參數(shù)匹配、同步控制及效率提升等關(guān)鍵問(wèn)題展開(kāi)系統(tǒng)性研究,對(duì)大型平地機(jī)的設(shè)計(jì)與開(kāi)發(fā)具有重要的理論與實(shí)際意義。本文以215Hp液力式平地機(jī)為研究對(duì)象,對(duì)前輪驅(qū)動(dòng)行駛系統(tǒng)進(jìn)行了研究與設(shè)計(jì)。通過(guò)對(duì)三種不同前輪驅(qū)動(dòng)方案的比較分析,以及對(duì)開(kāi)中心與閉中心負(fù)載敏感系統(tǒng)的效率分析,提出了基于閉中心負(fù)載敏感變量泵的前輪行駛液壓驅(qū)動(dòng)系統(tǒng)方案,通過(guò)應(yīng)用負(fù)載敏感變量泵、負(fù)載敏感多路閥及自由輪狀態(tài)閥等關(guān)鍵技術(shù),解決了前后驅(qū)動(dòng)輪同步、前驅(qū)左右輪同步及前驅(qū)不工作時(shí)動(dòng)力脫開(kāi)等問(wèn)題;根據(jù)215Hp平地機(jī)整機(jī)參數(shù),確定了前輪運(yùn)動(dòng)學(xué)和動(dòng)力學(xué)關(guān)鍵參數(shù),完成了液壓系統(tǒng)靜態(tài)參數(shù)匹配計(jì)算及液壓泵和液壓馬達(dá)等關(guān)鍵元件的選型和校核,并對(duì)全輪驅(qū)動(dòng)的平地機(jī)牽引特性進(jìn)行了計(jì)算;基于AMESim仿真軟件,對(duì)平地機(jī)前輪負(fù)載敏感液壓驅(qū)動(dòng)系統(tǒng)進(jìn)行了建模和仿真,建立了負(fù)載敏感變量泵和負(fù)載敏感多路閥等模型,分析了系統(tǒng)在不同工況下的動(dòng)態(tài)響應(yīng)、偏載工況下左右輪的同步性能以及系統(tǒng)在不同工況下的能耗和效率,對(duì)比研究了開(kāi)中心與閉中心負(fù)載敏感系統(tǒng)的工作效率,仿真結(jié)果驗(yàn)證了系統(tǒng)的可行性。
[Abstract]:The front wheel drive technology is one of the important means to improve the traction performance of the modern grader. By making full use of the attachment quality of the front wheel, the effective traction force of the whole machine can be improved, thus the working efficiency of the grader can be improved and the application range of the grader can be expanded. Especially in mining areas and other special occasions where there is a demand for large graders. At present, there are still limitations in the comprehensive research on the front wheel drive technology of grader. Therefore, the key problems such as system scheme design, parameter matching, synchronous control and efficiency improvement are systematically studied. It is of great theoretical and practical significance to the design and development of large grader. In this paper, the front wheel drive driving system is studied and designed with 215Hp hydraulic grader as the research object. Based on the comparative analysis of three different front wheel drive schemes and the efficiency analysis of open center and closed center load sensitive system, a hydraulic drive system scheme of front wheel driving based on closed center load sensitive variable pump is proposed. Through the application of key technologies such as load sensitive variable pump, load sensitive multi-way valve and free wheel state valve, the problems of front and rear drive wheel synchronization, front drive left and right wheel synchronization and power release when the front drive is not working are solved. According to the parameters of 215Hp grader, the key parameters of front wheel kinematics and dynamics are determined, and the static parameter matching calculation of hydraulic system and the selection and check of key components such as hydraulic pump and hydraulic motor are completed. The traction characteristics of the all-wheel drive grader are calculated. Based on AMESim simulation software, the load sensitive hydraulic drive system of grader front wheel is modeled and simulated, and the load sensitive variable pump and load sensitive multi-way valve are established, and the dynamic response of the system under different working conditions is analyzed. The synchronization performance of the left and right wheels under the partial load condition and the energy consumption and efficiency of the system under different working conditions are compared and studied, and the working efficiency of the open center and closed center load sensitive systems is compared and studied. The simulation results verify the feasibility of the system.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TH137

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 馬建;孫守增;芮海田;王磊;馬勇;張偉偉;張維;劉輝;陳紅燕;劉佼;董強(qiáng)柱;;中國(guó)筑路機(jī)械學(xué)術(shù)研究綜述·2018[J];中國(guó)公路學(xué)報(bào);2018年06期

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本文編號(hào)：2481676