本文選題：液壓活塞式混凝土輸送泵　切入點(diǎn)：防堵機(jī)構(gòu)　出處：《長春工業(yè)大學(xué)》2017年碩士論文

【摘要】：混凝土輸送泵因滿足當(dāng)前國內(nèi)提出的節(jié)能減排、綠色環(huán)保、高效工作等要求,在建設(shè)工程施工中得到廣泛應(yīng)用,但在泵送施工中經(jīng)常出現(xiàn)的堵塞,會(huì)影響工程進(jìn)度和質(zhì)量,需要亟待解決。為解決泵送施工中出現(xiàn)的堵塞問題,本文分析混凝土在流道流動(dòng)時(shí)發(fā)生堵塞的機(jī)理,設(shè)計(jì)一種防堵機(jī)構(gòu)來實(shí)現(xiàn)混凝土的順暢泵送。首先,分析了泵送混凝土堵塞的機(jī)理,參考液壓活塞式混凝土輸送泵的相關(guān)技術(shù)參數(shù),完成防堵機(jī)構(gòu)中各關(guān)鍵構(gòu)成元件的設(shè)計(jì)。運(yùn)用ANSYS Workbench軟件分析防堵機(jī)構(gòu)中主要傳動(dòng)元件在泵送施工狀態(tài)下的受力情況;分析結(jié)果表明,滾珠絲杠副的應(yīng)力、應(yīng)變均在泵送施工的安全使用范圍內(nèi)。此外,從提高混凝土泵送機(jī)械效率的角度出發(fā),運(yùn)用MATLAB對(duì)防堵機(jī)構(gòu)中螺旋葉片的螺距進(jìn)行優(yōu)化設(shè)計(jì),提高混凝土泵送效率。其次,根據(jù)流體流變原理,研究混凝土流體的運(yùn)動(dòng)特征。由混凝土的流動(dòng)特征以及多相流數(shù)值模擬理論,建立適合泵送混凝土多相流的數(shù)值模型。選用FLUENT流體模擬軟件,模擬添加防堵機(jī)構(gòu)前、后混凝土輸送缸內(nèi)的流場,并對(duì)模擬結(jié)果進(jìn)行對(duì)比分析。分析結(jié)果表明,添加防堵機(jī)構(gòu)后混凝土輸送缸內(nèi)流場分布更均勻。最后,通過理論計(jì)算,分析了防堵機(jī)構(gòu)中S管道幾何參數(shù)的改變對(duì)壓力損失和混凝土流動(dòng)特性的影響。根據(jù)混凝土的泵送理論,構(gòu)建S管道內(nèi)流體的數(shù)值模型,并結(jié)合正交試驗(yàn)優(yōu)化設(shè)計(jì)法,在FLUENT軟件中保持邊界條件不變,對(duì)模型進(jìn)行多次數(shù)值模擬,實(shí)現(xiàn)S管道各幾何參數(shù)的優(yōu)化設(shè)計(jì)。將優(yōu)化前后數(shù)值模擬結(jié)果進(jìn)行對(duì)比分析,分析結(jié)果表明,優(yōu)化后S管道內(nèi)混凝土流場分布均勻,壓力損失明顯減小,保證混凝土流體流動(dòng)的順暢性,降低混凝土堵塞S管道的可能性。
[Abstract]:Concrete pump is widely used in construction because it meets the requirements of energy saving, environmental protection, high efficiency and so on, but the blockage that often appears in pumping construction will affect the progress and quality of the project.It needs to be solved urgently.In order to solve the problem of blockage in pumping construction, this paper analyzes the mechanism of blockage in flow of concrete channel, and designs a kind of anti-blocking mechanism to realize smooth pumping of concrete.Firstly, the mechanism of the pump concrete blockage is analyzed, and the key components of the anti-blocking mechanism are designed by referring to the relevant technical parameters of the hydraulic piston concrete conveying pump.Using ANSYS Workbench software to analyze the stress of the main transmission elements in the anti-plugging mechanism under the pumping construction condition, and the analysis results show that the stress and strain of the ball screw pair are all within the safe application range of the pumping construction.In addition, in order to improve the mechanical efficiency of concrete pumping, MATLAB is used to optimize the pitch of the screw blade in the anti-plugging mechanism to improve the efficiency of concrete pumping.Secondly, according to the principle of fluid rheology, the movement characteristics of concrete fluid are studied.Based on the flow characteristics of concrete and the numerical simulation theory of multiphase flow, a numerical model suitable for pumping concrete multiphase flow is established.FLUENT fluid simulation software was used to simulate the flow field in the concrete conveying cylinder before and after adding the anti-plugging mechanism, and the simulation results were compared and analyzed.The results show that the distribution of flow field in the concrete conveying tank is more uniform.Finally, the influence of the geometric parameters of S pipeline on the pressure loss and the flow characteristics of concrete is analyzed by theoretical calculation.According to the pumping theory of concrete, the numerical model of the fluid in S pipeline is constructed, and combined with the orthogonal test optimization design method, the boundary condition is kept unchanged in FLUENT software, and the model is numerically simulated many times.The optimum design of the geometric parameters of S pipeline is realized.The numerical simulation results before and after optimization are compared and analyzed. The results show that the flow field of concrete in S pipeline is uniform, the pressure loss is obviously reduced, and the smooth flow of concrete fluid is ensured.Reduce the possibility of concrete blocking S pipes.
【學(xué)位授予單位】：長春工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU646

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