發(fā)布時間：2018-05-29 21:50

  本文選題：高壓水射流 + 截齒��； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：掘進(jìn)機(jī)是煤炭開采的關(guān)鍵設(shè)備,其性能的優(yōu)劣直接影響掘進(jìn)效率。掘進(jìn)機(jī)截齒截割硬巖存在截割效率低、磨損嚴(yán)重、溫度高等問題,高壓水射流—截齒聯(lián)合破巖能夠有效解決上述問題。文本基于流體動力學(xué)理論,提出一種可以自動調(diào)節(jié)流量的新型掘進(jìn)機(jī)自控水力截齒,有效解決了普通高壓水射流一截齒聯(lián)合破巖方式中存在的水量浪費(fèi)和水患問題。采用理論分析、仿真和試驗(yàn)相結(jié)合的方法,對自控水力截齒的工作性能和破巖特性進(jìn)行研究。論文以機(jī)械破巖理論以及水射流破巖理論為基礎(chǔ),對高壓水射流-截齒聯(lián)合破巖理論進(jìn)行研究,探尋巖石裂紋擴(kuò)展規(guī)律。在分析自控水力截齒工作原理的基礎(chǔ)上,對截齒機(jī)械結(jié)構(gòu)及內(nèi)流道進(jìn)行設(shè)計�；贔LUENT軟件,建立自控水力截齒流場仿真模型,包括空載狀態(tài)流場、噴嘴自由噴射流場和水射流沖擊巖石流場。分別對自控水力截齒的流量減小特性、非淹沒射流流場分布特性和無因次靶距對于沖擊巖石流場特性的影響規(guī)律進(jìn)行研究,為自控水力截齒結(jié)構(gòu)設(shè)計和參數(shù)選擇提供依據(jù)。分別對自控水力截齒的摩擦阻力特性和截齒液動力進(jìn)行分析,在此基礎(chǔ)上建立自控水力截齒動態(tài)響應(yīng)模型,探尋其開啟過程和關(guān)閉過程的響應(yīng)規(guī)律,證明自控水力截齒的可行性和可靠性。進(jìn)而研究巖石抗拉強(qiáng)度、截割深度、水射流壓力和截齒結(jié)構(gòu)參數(shù)對動態(tài)響應(yīng)特性的影響�；贚SDYNA軟件,采用FEM-SPH耦合算法對普通截齒和自控水力截齒破巖特性進(jìn)行仿真研究,系統(tǒng)研究巖石抗拉強(qiáng)度、截割深度、水射流壓力等參數(shù)對巖石破碎效果的影響�；赩 Workbench軟件,對自控水力截齒力學(xué)特性進(jìn)行仿真研究,探尋巖石抗拉強(qiáng)度和截割深度對自控水力截齒系統(tǒng)應(yīng)力、變形分布的影響,提出截齒結(jié)構(gòu)優(yōu)化方案。搭建自控水力截齒破巖試驗(yàn)臺,配制巖石試樣,研制加工自控水力截齒,開展自控水力截齒關(guān)閉過程摩擦阻力特性、開啟特性、動態(tài)響應(yīng)特性、流量特性和巖石截割的試驗(yàn)研究,并對其影響因素及規(guī)律進(jìn)行了分析,為自控水力截齒的實(shí)際應(yīng)用提供了依據(jù)。試驗(yàn)結(jié)果與仿真結(jié)論基本一致,證明了仿真的正確性。
[Abstract]:Roadheader is the key equipment in coal mining, and its performance directly affects the tunneling efficiency. There are some problems such as low cutting efficiency, serious wear, high temperature and so on in the cutting hard rock of tunneling machine. The problems mentioned above can be effectively solved by the combination of high pressure water jet and tooth cutting. Based on the theory of hydrodynamics, this paper presents a new type of roadheader, which can automatically adjust the flow rate, which can effectively solve the problems of water waste and flood in the common high pressure water jet and tooth cutting combined with rock breaking. The working performance and rock breaking characteristics of automatic control hydraulic gear cutting are studied by means of theoretical analysis, simulation and test. On the basis of mechanical rock breaking theory and water jet rock breaking theory, the high pressure water jet combined broken rock theory is studied in this paper, and the law of rock crack propagation is explored. On the basis of analyzing the working principle of automatic control hydraulic gear cutting, the structure and internal runner of gear cutting machine are designed. Based on FLUENT software, the simulation model of self-control hydraulic truncation flow field is established, including no-load flow field, nozzle free jet flow field and water jet impinging flow field. The characteristics of flow reduction, the distribution of flow field of non-submerged jet and the influence of dimensionless target distance on the characteristics of impinging rock flow field are studied respectively, which provides the basis for the structural design and parameter selection of self-controlled hydraulic tooth cutting. Based on the analysis of friction resistance characteristics and hydrodynamic forces of self-controlled hydraulic gear cutting, the dynamic response model of self-controlled hydraulic gear cutting is established, and the response law of its opening and closing process is explored. The feasibility and reliability of automatic hydraulic gear cutting are proved. The effects of rock tensile strength, cutting depth, water jet pressure and structural parameters on dynamic response were studied. Based on LSDYNA software, the characteristics of rock broken by common and self-controlled hydraulic cutting are simulated by using FEM-SPH coupling algorithm. The effects of rock tensile strength, cutting depth and water jet pressure on rock breakage are systematically studied. Based on V Workbench software, the mechanical characteristics of automatic control hydraulic tooth cutting are simulated and studied. The influence of rock tensile strength and cutting depth on stress and deformation distribution of automatic control hydraulic gear cutting system is explored, and the optimization scheme of tooth cutting structure is put forward. The self-control hydraulic tooth cutting test bench was built, the rock sample was prepared, the automatic control hydraulic tooth cutting was developed and processed, the friction resistance characteristics, the opening characteristics and the dynamic response characteristics of the automatic control hydraulic tooth cutting closing process were carried out. The experimental study on flow characteristics and rock cutting, and the analysis of its influencing factors and laws are provided for the practical application of automatic control hydraulic tooth cutting. The experimental results are basically consistent with the simulation results, and the correctness of the simulation is proved.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD421.5

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本文編號：1952534