本文選題：混凝土濕噴機 + 液壓沖擊　； 參考：《中國礦業(yè)大學(xué)》2015年博士論文

【摘要】：煤礦巷道錨噴支護作業(yè)采用濕式混凝土噴射工藝能有效降低粉塵濃度和回彈率,研制能完成上料、配比、攪拌、輸送和噴射等工序的濕式混凝土噴射系統(tǒng),對于提高噴射混凝土的質(zhì)量和生產(chǎn)效率、降低工人勞動強度具有非常重要的意義和廣闊的應(yīng)用前景。針對目前煤礦巷道濕式混凝土噴射系統(tǒng)研究中存在的濕噴機液壓沖擊大、噴射工藝參數(shù)選擇無理論依據(jù)、濕噴機供料機械化程度低等問題,本文在以下幾個方面進行了深入的研究�？紤]泵送液壓缸兩端的緩沖結(jié)構(gòu),建立了混凝土濕噴機泵送液壓系統(tǒng)數(shù)學(xué)模型和輸送管道的負載特性模型,基于計算流體力學(xué)理論,利用FLUENT軟件對泵送壓力進行了模擬計算,根據(jù)零部件結(jié)構(gòu)尺寸及性能參數(shù)設(shè)置了具體的仿真參數(shù),利用MATLAB/Simulink軟件對濕噴機泵送液壓系統(tǒng)進行了數(shù)值模擬;通過仿真研究了換向閥切換時間、泵流量、油液彈性模量和節(jié)流閥結(jié)構(gòu)參數(shù)等對泵送系統(tǒng)液壓沖擊的影響規(guī)律,在此基礎(chǔ)上提出了濕噴機液壓系統(tǒng)的改進方案。采用FLUENT軟件,基于RNG型k-ε粘性流動模型,通過基于歐拉法的多相流流動模擬手段,對不同高壓風(fēng)入口風(fēng)壓以及混凝土噴射量工況下的空氣與混凝土混合兩相流場的速度及各相體積分數(shù)信息進行了仿真計算,掌握了風(fēng)壓、噴射流量等濕噴工藝參數(shù)對噴射流場特性的影響規(guī)律。開發(fā)了混凝土濕噴機供料系統(tǒng),包括煤礦用砂石上料機和礦用混凝土攪拌機,并針對煤礦巷道內(nèi)狹小空間的使用要求,對砂石上料機的抓斗和混凝土攪拌機的上料變幅裝置進行了優(yōu)化,解決了目前煤礦巷道混凝土濕噴采用人工供料效率低、工人勞動強度大等問題,實現(xiàn)了煤礦巷道混凝土濕噴機械化作業(yè)。研制了煤礦巷道濕式混凝土噴射系統(tǒng)樣機,主要包括煤礦用砂石上料機、礦用混凝土攪拌機樣機和改進后的SPB7型混凝土濕噴機,基于該系統(tǒng)提出了一種濕式混凝土噴射施工的工藝方法,并在煤礦井下開展了試驗研究,結(jié)果表明煤礦巷道濕式混凝土噴射系統(tǒng)滿足設(shè)計功能要求,系統(tǒng)內(nèi)各設(shè)備間效率匹配,混凝土噴射施工效率明顯提高,成本顯著下降。
[Abstract]:The wet concrete spraying technology can effectively reduce the dust concentration and springback rate in the roadway bolting and shotcreting operation in coal mine. The wet concrete spraying system which can finish the processes of feeding, proportioning, mixing, conveying and spraying is developed.It is of great significance and broad application prospect to improve the quality and production efficiency of shotcrete and to reduce the labor intensity of workers.In view of the problems existing in the research of wet concrete spraying system in coal mine roadway, such as the large hydraulic impact of wet jet machine, the lack of theoretical basis for the selection of injection process parameters, and the low degree of mechanization of wet jet machine feeding, etc.This article has carried on the thorough research in the following several aspects.Considering the buffer structure at both ends of the pump hydraulic cylinder, the mathematical model of the pumping hydraulic system and the load characteristic model of the conveying pipe are established. Based on the theory of computational fluid dynamics, the pump pressure is simulated by using FLUENT software.The specific simulation parameters are set up according to the structural size and performance parameters of the parts, and the numerical simulation of the pump hydraulic system of the wet jet machine is carried out by using MATLAB/Simulink software, and the switching time of the reversing valve and the flow rate of the pump are studied by simulation.The influence of elastic modulus of oil and structure parameters of throttle valve on hydraulic impingement of pumping system is discussed. On the basis of this the improvement scheme of hydraulic system of wet jet machine is put forward.Based on RNG k- 蔚 viscous flow model and FLUENT software, the multiphase flow simulation method based on Euler method is presented.The velocity and volume fraction information of air and concrete mixed two-phase flow field under different high pressure inlet wind pressure and concrete spray rate are simulated and calculated, and the wind pressure is grasped.The effect of spray flow rate and other wet jet process parameters on the characteristics of jet flow field.The feeding system of wet concrete spraying machine is developed, which includes sand and stone feeder for coal mine and concrete mixer for coal mine, and aiming at the application requirements of narrow space in coal mine roadway.This paper optimizes the grabbing of sand and stone feeding machine and the feeding and changing amplitude device of concrete mixer, solves the problems of low artificial feeding efficiency and large labor intensity of wet spraying concrete in coal mine roadway at present.The mechanization of concrete wet spraying in coal mine roadway is realized.The prototype of wet concrete spraying system for coal mine roadway is developed, which mainly includes coal mine sand and stone feeder, mine concrete mixer and improved SPB7 type concrete wet spraying machine.Based on this system, a kind of wet concrete spray construction technology method is put forward, and the experimental research is carried out in the coal mine. The results show that the wet concrete spraying system in coal mine roadway meets the design function requirements, and the efficiency of each equipment in the system is matched.The efficiency of concrete shotcrete construction is obviously improved, and the cost is decreased significantly.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TD353.3

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