發(fā)布時(shí)間：2018-05-02 21:37

  本文選題：履帶起重機(jī) + 動(dòng)力匹配��； 參考：《吉林大學(xué)》2011年碩士論文

【摘要】：履帶起重機(jī)在國內(nèi)可以算作新興產(chǎn)業(yè),最近五年發(fā)展極為迅速,不但產(chǎn)量以每年超過50%以上的增長率增長,而且噸位也在跨越式的提高,到2010年,國內(nèi)最大履帶起重機(jī)達(dá)到2000噸,可以與世界最高水平相媲美。但缺乏專門的動(dòng)力匹配研究,應(yīng)用水平還處于一個(gè)較低的水平,由于履帶起重機(jī)需要匹配大功率發(fā)動(dòng)機(jī),能耗巨大,因此研究履帶起重機(jī)動(dòng)力匹配具有十分重要的意義。 本文以QUY100噸履帶起重機(jī)作為研究對(duì)象,針對(duì)某公司的QUY100噸履帶起重機(jī)在將力士樂的恒功率變量泵系統(tǒng)更換為林德的LS負(fù)載敏感系統(tǒng)后,出現(xiàn)行走時(shí)發(fā)動(dòng)機(jī)容易熄火的問題,利用AMESim液壓仿真軟件及數(shù)據(jù)采集儀等設(shè)備,對(duì)QUY100噸履帶起重機(jī)的兩種動(dòng)力系統(tǒng)進(jìn)行了全面分析,并對(duì)行走液壓系統(tǒng)和卷揚(yáng)系統(tǒng)進(jìn)行了系統(tǒng)性測試評(píng)估,通過分析、測試了解到熄火原因是林德的LS負(fù)載敏感系統(tǒng)在發(fā)動(dòng)機(jī)低轉(zhuǎn)速工況時(shí)所需功率超出發(fā)動(dòng)機(jī)所能提供的范圍,造成發(fā)動(dòng)機(jī)動(dòng)力不足。然后,根據(jù)熄火問題原因提出了降低LS泵上的流量控制閥壓差△P、限制控制閥位移、引入發(fā)動(dòng)機(jī)轉(zhuǎn)速信號(hào)、改變LS閥反饋特性等四種有效的解決方法,并進(jìn)行了簡單的改進(jìn)方案驗(yàn)證。更好地實(shí)現(xiàn)發(fā)動(dòng)機(jī)與液壓泵的合理匹配,達(dá)到提高作業(yè)效率及環(huán)保、節(jié)能的目的。文中提出的控制方案具有良好的節(jié)能效果,為后續(xù)的產(chǎn)品開發(fā)提供了一定的理論基礎(chǔ)。
[Abstract]:Crawler cranes can be regarded as a new industry in China. In the past five years, the development of crawler cranes has been extremely rapid. Not only has the output increased at an annual rate of more than 50%, but also the tonnage has been increased by leaps and bounds. By 2010, The largest crawler crane in China reaches 2000 tons, comparable to the highest level in the world. However, due to the lack of special research on dynamic matching and the low level of application, it is very important to study the dynamic matching of crawler cranes because the crawler cranes need to match high power engines and consume a lot of energy. This paper takes the QUY100 ton crawler crane as the research object, aiming at the QUY100 ton crawler crane of a certain company. After replacing Rexroth's constant power variable pump system with Linde's LS load sensitive system, the engine flameout easily occurs while walking. Two kinds of power systems of QUY100 ton crawler crane are comprehensively analyzed by using AMESim hydraulic simulation software and data acquisition equipment, and systematic test and evaluation of walking hydraulic system and hoisting system are carried out. The test results show that the reason of flameout is that Lind's LS load sensitive system needs more power than the engine can provide under low speed condition, which results in insufficient engine power. Then, according to the reason of flameout problem, four effective solutions are put forward, such as reducing the pressure difference of flow control valve on LS pump, limiting the displacement of control valve, introducing engine speed signal and changing the feedback characteristic of LS valve. A simple improved scheme is verified. The reasonable matching of engine and hydraulic pump is realized, and the purpose of improving working efficiency, environmental protection and energy saving is achieved. The proposed control scheme has good energy-saving effect and provides a theoretical basis for subsequent product development.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH213.7

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本文編號(hào)：1835593