【摘要】：液壓平衡閥是平衡回路中的關(guān)鍵元件，在現(xiàn)代工程機(jī)械特別是起重機(jī)械和混凝土泵送機(jī)械中應(yīng)用廣泛。它在起重機(jī)臂架下落工況和泵車臂架展開、收回的工況中起到至關(guān)重要的作用，若其設(shè)計(jì)不合理會(huì)嚴(yán)重影響整機(jī)的作業(yè)性能，而且目前國內(nèi)應(yīng)用的平衡閥多為國外進(jìn)口。因此對(duì)液壓平衡閥的研究具有重要理論意義和工程應(yīng)用價(jià)值。 本文研究了泵車臂架系統(tǒng)的典型工況，得出了不同工況對(duì)平衡閥性能的要求，提出了一種泵車臂架新型平衡閥設(shè)計(jì)方案及具體結(jié)構(gòu)，對(duì)平衡閥內(nèi)部液壓橋路和主閥芯節(jié)流槽的進(jìn)行了設(shè)計(jì)。利用AMESim軟件，建立了泵車臂架新型平衡閥的仿真模型。分正向進(jìn)油和反向回油兩種工況對(duì)新型平衡閥的模型進(jìn)行了仿真，仿真結(jié)果表明：正向進(jìn)油和反向回油經(jīng)過該平衡閥壓力損失都能符合設(shè)計(jì)要求，，主閥芯正向和反向開啟時(shí)間短，也能滿足設(shè)計(jì)要求。 本文建立了泵車臂架系統(tǒng)平衡回路的AMESim仿真模型，仿真了臂架正負(fù)載時(shí)起動(dòng)到停止、負(fù)負(fù)載時(shí)起動(dòng)到停止、從正負(fù)載過渡到負(fù)負(fù)載和由負(fù)負(fù)載過渡到正負(fù)載四種典型工況。仿真結(jié)果表明：在正負(fù)載和負(fù)負(fù)載兩種工況下，臂架突然啟動(dòng)時(shí)油缸活塞桿速度響應(yīng)較快，穩(wěn)態(tài)速度與實(shí)際速度相符，突然關(guān)閉時(shí)響應(yīng)時(shí)間短。泵車臂架在正負(fù)載工況和負(fù)負(fù)載工況過渡的過程中，油缸活塞桿速度也能維持穩(wěn)定。綜上，應(yīng)用新型平衡閥的平衡回路系統(tǒng)性能可以滿足工程應(yīng)用要求。
[Abstract]:Hydraulic balancing valve is a key element in balancing circuit, and is widely used in modern construction machinery, especially in lifting machinery and concrete pumping machinery. It plays an important role in the falling condition of the crane boom and the boom of the pump truck. If its design is unreasonable, the performance of the whole machine will be seriously affected, and the balance valve used in our country is mostly imported from abroad. Therefore, the study of hydraulic balancing valve has important theoretical significance and engineering application value. In this paper, the typical working conditions of the boom system of the pump vehicle are studied, and the requirements for the performance of the balancing valve under different working conditions are obtained, and a new type of balanced valve design scheme and concrete structure for the boom frame of the pump car are put forward. The hydraulic bridge inside the balance valve and the main valve core throttle are designed. Using AMESim software, the simulation model of a new type of balance valve for boom of pump car is established. The model of the new balancing valve is simulated under the two working conditions of forward oil injection and reverse oil return. The simulation results show that the pressure loss of the forward oil inlet and the reverse return oil through the balance valve can meet the design requirements. The main spool is short in both forward and reverse opening time and can also meet the design requirements. In this paper, the AMESim simulation model of the balance loop of the boom system of the pump truck is established. Four typical working conditions are simulated: starting to stop when the boom is positive, starting to stopping when the load is negative, transition from positive load to negative load and from negative load to positive load. The simulation results show that under both positive and negative load conditions, the piston rod speed response of the cylinder is faster when the boom suddenly starts, the steady state velocity is consistent with the actual speed, and the response time is short when the boom suddenly closes. The piston rod speed of the pump truck can also be kept stable during the transition of positive load and negative load. In conclusion, the system performance of the new balance valve can meet the requirements of engineering application.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TU646;TH137.52

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