螺旋卸船機(jī)垂直輸送機(jī)理及試驗(yàn)研究
發(fā)布時(shí)間：2019-04-02 00:58
【摘要】：隨著世界船舶運(yùn)輸業(yè)散裝化的飛速發(fā)展，螺旋卸船機(jī)作為一種性能優(yōu)良的連續(xù)型散貨卸船機(jī)械，以其環(huán)保、節(jié)能等綜合優(yōu)勢(shì)受到廣大港口的青睞。螺旋卸船機(jī)的垂直輸送機(jī)理研究是該領(lǐng)域的核心問(wèn)題，目前正受到相關(guān)學(xué)者的高度關(guān)注和重視。本文以螺旋卸船機(jī)的垂直輸送為對(duì)象，分別采用散體力學(xué)理論模型分析方法、接觸力學(xué)離散元理論的仿真方法、樣機(jī)試驗(yàn)方法，對(duì)其垂直輸送機(jī)理進(jìn)行了全面深入的研究，其主要工作和取得的創(chuàng)新性研究成果如下： （1）應(yīng)用散體力學(xué)、連續(xù)介質(zhì)力學(xué)及顆粒群理論，建立了垂直螺旋卸船機(jī)內(nèi)物料顆粒群穩(wěn)定運(yùn)動(dòng)的散體力學(xué)模型，創(chuàng)新性地對(duì)螺旋槽內(nèi)物料顆粒群的轉(zhuǎn)速作出了沿徑向變化的假設(shè)。通過(guò)對(duì)物料的運(yùn)動(dòng)分析，，確立了物料的運(yùn)動(dòng)特征參數(shù)。研究確定了輸送機(jī)縱向截面的物料自由表面類(lèi)型及其判別、求解的方法與物料顆粒群對(duì)輸送管壁及螺旋面的壓力分布規(guī)律，建立了物料的運(yùn)動(dòng)特征參數(shù)、生產(chǎn)率與螺旋軸驅(qū)動(dòng)功率的計(jì)算模型并給出數(shù)值計(jì)算方法。應(yīng)用垂直輸送機(jī)理分析模型，對(duì)輸送機(jī)相關(guān)設(shè)計(jì)參數(shù)與性能參數(shù)的變化規(guī)律進(jìn)行了描述，為垂直螺旋輸送機(jī)主要參數(shù)的確定提供了科學(xué)的理論支撐。 （2）應(yīng)用離散元理論及EDEM軟件，對(duì)物料的相關(guān)物性參數(shù)、物料的垂直螺旋輸送過(guò)程、物料在輸送機(jī)底部的進(jìn)料過(guò)程及其在滾動(dòng)間隔式中間支撐處的運(yùn)動(dòng)過(guò)程進(jìn)行了系統(tǒng)的仿真。對(duì)不同充填率及不同螺旋轉(zhuǎn)速下垂直螺旋底部的取料、垂直輸送及物料在中間支撐處的運(yùn)動(dòng)過(guò)程進(jìn)行了離散元仿真分析，獲取了垂直螺旋輸送性能參數(shù)的變化特性、取料裝置供料能力隨自轉(zhuǎn)轉(zhuǎn)速及集料螺旋轉(zhuǎn)速的變化關(guān)系，驗(yàn)證了物料在滾動(dòng)間隔式中間支撐處的通過(guò)性，并給出了滾動(dòng)間隔式中間支撐的設(shè)計(jì)準(zhǔn)則。 （3）以L型螺旋卸船機(jī)的取料及垂直輸送機(jī)頭作為試驗(yàn)研究的平臺(tái)，對(duì)螺旋卸船機(jī)垂直輸送機(jī)理及相關(guān)的取料過(guò)程、物料中間支撐通過(guò)性進(jìn)行了試驗(yàn)研究。研究開(kāi)發(fā)了螺旋卸船機(jī)垂直輸送及取料機(jī)理試驗(yàn)臺(tái)，制定了相關(guān)性能測(cè)試的試驗(yàn)方案；對(duì)輸送機(jī)進(jìn)料能力、輸送性能參數(shù)隨螺旋轉(zhuǎn)速及充填率的變化關(guān)系、取料性能參數(shù)隨取料螺旋轉(zhuǎn)速及料堆高度的變化關(guān)系進(jìn)行了試驗(yàn)研究，驗(yàn)證了物料在中間支撐處的通過(guò)性及理論模型和仿真模型的一致性。試驗(yàn)研究結(jié)果揭示了輸送機(jī)進(jìn)料口極限進(jìn)料量的規(guī)律，獲取了垂直輸送及取料過(guò)程的相關(guān)變化曲線，驗(yàn)證了理論模型的正確性和仿真模型精度的局限性。 本文提出的螺旋卸船機(jī)垂直輸送機(jī)理的研究方法和結(jié)論，為新型螺旋卸船機(jī)的開(kāi)發(fā)提供了理論支撐和設(shè)計(jì)準(zhǔn)則，為不同特性散體物料的螺旋輸送研究提供了新的思路。
[Abstract]:With the rapid development of bulk loading in the world shipping industry, spiral ship unloader, as a kind of continuous bulk cargo unloading machine with excellent performance, has been favored by the majority of ports for its comprehensive advantages of environmental protection and energy saving. The research on the vertical transport mechanism of spiral ship unloader is the core problem in this field, which is being paid close attention to by the relevant scholars at present. In this paper, the vertical conveying mechanism of spiral ship unloader is studied comprehensively and deeply by means of theoretical model analysis of bulk mechanics, simulation method of discrete element theory of contact mechanics and prototype test method. The main work and innovative research results are as follows: (1) based on the theory of bulk mechanics, continuum mechanics and particle group, the mechanical model of the stable movement of particles in vertical spiral ship unloader is established. The rotating speed of particle group in spiral groove was creatively assumed to vary along the radial direction. Through the motion analysis of the material, the motion characteristic parameters of the material are established. The free surface type and its discrimination of the longitudinal section of the conveyor are studied and determined. The method of solving the problem and the pressure distribution law of the material particle group on the conveying pipe wall and the spiral surface are studied, and the moving characteristic parameters of the material are established. The calculation model of productivity and driving power of screw axis is given and the numerical calculation method is given. Based on the analysis model of vertical conveying mechanism, the variation law of the design parameters and performance parameters of the conveyor is described, which provides a scientific theoretical support for the determination of the main parameters of the vertical screw conveyor. (2) based on the discrete element theory and EDEM software, the physical parameters of the material and the vertical spiral conveying process of the material are studied. The feeding process of the material at the bottom of the conveyor and the movement of the material at the middle support of the rolling spacer are systematically simulated. In this paper, the discrete element simulation is carried out to simulate the feeding process of the bottom of the vertical screw, the vertical transport and the movement of the material at the middle support under different filling rates and different screw speeds, and the variation characteristics of the performance parameters of the vertical spiral conveying are obtained. The relationship between the feeding capacity of the reclaimer and the rotating speed of the rotating speed and the screw speed of the aggregate is given. The passage of the material at the intermediate support of the rolling spacer is verified and the design criterion of the intermediate support of the rolling spacer is given. (3) taking L-type screw ship unloader as the experimental platform, the mechanism of vertical transportation and the related feeding process, and the passage of the intermediate support of the screw ship unloader are experimentally studied in this paper. The mechanism of the vertical transport of the screw ship unloader and the passage of the intermediate support of the material are studied experimentally. The vertical conveying and taking-off mechanism test-bed of spiral ship unloader is studied and developed, and the test scheme of related performance testing is worked out. The relationship between the feed capacity, the conveying performance parameters and the screw speed and the filling rate of the conveyor, and the relationship between the feed performance parameters and the screw speed and the height of the pile of the conveyor are studied experimentally. The consistency of theoretical model and simulation model is verified. The experimental results reveal the rule of the limit feed quantity of the conveyer inlet, and obtain the relevant curves of the vertical conveying and feeding process. The correctness of the theoretical model and the limitation of the accuracy of the simulation model are verified. The research methods and conclusions of vertical conveying mechanism of spiral ship unloader presented in this paper provide theoretical support and design criteria for the development of a new type of spiral ship unloader, and provide a new way of thinking for the study of helical transport of bulk materials with different characteristics.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U653.928.1
本文編號(hào)：2452073
[Abstract]:With the rapid development of bulk loading in the world shipping industry, spiral ship unloader, as a kind of continuous bulk cargo unloading machine with excellent performance, has been favored by the majority of ports for its comprehensive advantages of environmental protection and energy saving. The research on the vertical transport mechanism of spiral ship unloader is the core problem in this field, which is being paid close attention to by the relevant scholars at present. In this paper, the vertical conveying mechanism of spiral ship unloader is studied comprehensively and deeply by means of theoretical model analysis of bulk mechanics, simulation method of discrete element theory of contact mechanics and prototype test method. The main work and innovative research results are as follows: (1) based on the theory of bulk mechanics, continuum mechanics and particle group, the mechanical model of the stable movement of particles in vertical spiral ship unloader is established. The rotating speed of particle group in spiral groove was creatively assumed to vary along the radial direction. Through the motion analysis of the material, the motion characteristic parameters of the material are established. The free surface type and its discrimination of the longitudinal section of the conveyor are studied and determined. The method of solving the problem and the pressure distribution law of the material particle group on the conveying pipe wall and the spiral surface are studied, and the moving characteristic parameters of the material are established. The calculation model of productivity and driving power of screw axis is given and the numerical calculation method is given. Based on the analysis model of vertical conveying mechanism, the variation law of the design parameters and performance parameters of the conveyor is described, which provides a scientific theoretical support for the determination of the main parameters of the vertical screw conveyor. (2) based on the discrete element theory and EDEM software, the physical parameters of the material and the vertical spiral conveying process of the material are studied. The feeding process of the material at the bottom of the conveyor and the movement of the material at the middle support of the rolling spacer are systematically simulated. In this paper, the discrete element simulation is carried out to simulate the feeding process of the bottom of the vertical screw, the vertical transport and the movement of the material at the middle support under different filling rates and different screw speeds, and the variation characteristics of the performance parameters of the vertical spiral conveying are obtained. The relationship between the feeding capacity of the reclaimer and the rotating speed of the rotating speed and the screw speed of the aggregate is given. The passage of the material at the intermediate support of the rolling spacer is verified and the design criterion of the intermediate support of the rolling spacer is given. (3) taking L-type screw ship unloader as the experimental platform, the mechanism of vertical transportation and the related feeding process, and the passage of the intermediate support of the screw ship unloader are experimentally studied in this paper. The mechanism of the vertical transport of the screw ship unloader and the passage of the intermediate support of the material are studied experimentally. The vertical conveying and taking-off mechanism test-bed of spiral ship unloader is studied and developed, and the test scheme of related performance testing is worked out. The relationship between the feed capacity, the conveying performance parameters and the screw speed and the filling rate of the conveyor, and the relationship between the feed performance parameters and the screw speed and the height of the pile of the conveyor are studied experimentally. The consistency of theoretical model and simulation model is verified. The experimental results reveal the rule of the limit feed quantity of the conveyer inlet, and obtain the relevant curves of the vertical conveying and feeding process. The correctness of the theoretical model and the limitation of the accuracy of the simulation model are verified. The research methods and conclusions of vertical conveying mechanism of spiral ship unloader presented in this paper provide theoretical support and design criteria for the development of a new type of spiral ship unloader, and provide a new way of thinking for the study of helical transport of bulk materials with different characteristics.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U653.928.1
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