基于离散元的层压破碎模型及破碎过程的研究
发布时间：2019-03-01 08:05
【摘要】：层压破碎是指散体岩(矿)石物料在破碎腔内呈多层分布时的受压破碎,即大量岩石物料聚集在一起,外力作用于物料层,岩石物料层传递应力使得岩石颗粒间相互接触、相互作用而产生岩石颗粒群体性破碎。随着破碎粉磨理论研究的深入和实践技术应用的提高,深入研究层压破碎机理与规律,为实现层压破碎原理与参数技术应用,为实现新型层压破碎设备的研发提拱理论依据具有重要的意义。本文所做的工作主要有:(1)根据圆锥破碎机工作原理,分析了动锥和散体岩石物料颗粒在破碎腔内的运动特性,基于层压破碎原理、分层破碎理论和固定质量原理提出了圆锥破碎机层压破碎过程进行分层研究;建立了层压破碎过程关于破碎函数、选择函数和层压破碎分层数的数学模型,并且进一步得出散体岩石物料物理特性、圆锥破碎机工作参数和结构参数是影响圆锥破碎机层压破碎过程和破碎效果的本质因素;通过详细分析各影响因素参数对层压破碎过程与破碎效果的影响规律,建立了层压破碎影响因素数学模型。(2)以PYB900圆锥破碎机的实际工作参数与结构参数为依据,利用离散元软件EDEM和三维设计软件Solidworks建立了圆锥破碎机层压破碎三维模型,并基于BPM(粘接颗粒模型)建立了用于破碎的不规则、更为接近真实的花岗岩岩石物料模型;基于该模型计算破碎腔内物料层填充度满足层压破碎方式发生条件,对圆锥破碎机层压破碎过程进行了模拟仿真,探究了岩石颗粒物料层在破碎腔内受压破碎的内在规律,其包括岩石物料层的破碎状态、运动状态及受力状态的特点。(3)基于建立的圆锥破碎机层压破碎模型,设计了层压破碎影响规律模拟仿真实验,研究了散体岩石物料的粒径、粒形和给料层厚度,圆锥破碎机工作参数动锥旋摆转速,结构参数动锥摆动行程和破碎腔啮角分别对圆锥破碎机产品粒度质量和生产率的影响变化规律,从这两方面了评价层压破碎效果,通过分析仿真结果得出结论有:在破碎腔内的岩石物料层孔隙率越小,层压破碎作用越明显,破碎效率越高,而岩石物料粒径越小和岩石粒形越扁平越难破碎即破碎产品质量较差;在破碎过程中,为了保证物料间的密实状态,抑制“上拱现象”的产生,岩石物料给料量有一最佳值即料层高度为520 mm;针对PYB900圆锥破碎机模型存在些最佳破碎参数即动锥最佳旋摆转速为360 r/min,定锥最佳摆动行程为43 mm,破碎腔存在最佳啮角范围为23.5°~24.7°,这些参数值和范围使得破碎机层压破碎效果最佳。
[Abstract]:Laminar crushing refers to the crushing of bulk rock (ore) material when it is multi-layer distribution in the crushing chamber, that is, a large number of rock materials are gathered together, the external force acts on the material layer, and the transfer stress of the rock material layer makes the rock particles contact with each other. The interaction results in the fragmentation of rock particles. With the deepening of the theoretical research of crushing grinding and the improvement of practical technology application, the mechanism and law of laminate crushing are deeply studied. In order to realize the application of laminate crushing principle and parameter technology, It is of great significance to develop the theoretical basis of raising arch in order to realize a new type of laminated crushing equipment. The main work of this paper is as follows: (1) according to the working principle of cone crusher, the motion characteristics of moving cone and granular rock particles in the crusher are analyzed, based on the principle of laminate crushing. Delamination theory and fixed quality principle are put forward to study the lamination process of cone crusher. The mathematical models of the crushing function, the selection function and the lamination number of the laminate crushing process are established, and the physical properties of the bulk rock materials are further obtained. The working parameters and structural parameters of cone crusher are the essential factors affecting the process and effect of layer crushing of cone crusher. Based on the detailed analysis of the influencing factors on the process and effect of laminate crushing, a mathematical model of the influencing factors is established. (2) based on the actual working parameters and structural parameters of the PYB900 cone crusher, the mathematical model of the influencing factors is established. Using discrete element software EDEM and three-dimensional design software Solidworks, the three-dimensional model of laminated crushing of cone crusher is established. Based on BPM (adhesive particle model), the irregular, closer to true granite rock material model for crushing is established. Based on the model, the filling degree of the material layer in the crushing chamber satisfies the condition of the laminate crushing mode. The simulation of the laminate crushing process of the cone crusher is carried out, and the inherent law of the rock granular material layer being crushed in the crushing chamber is explored. It includes the characteristics of crushing state, motion state and stress state of rock material layer. (3) based on the model of cone crusher, the simulation experiment of the influence law of laminar crushing is designed. The particle size, grain shape and thickness of feed layer, working parameters of cone crusher, rotating speed of dynamic cone pendulum were studied. The effect of dynamic cone swing stroke and rodent angle of crusher on particle size quality and productivity of cone crusher is studied, and the effect of laminate crushing is evaluated from these two aspects. The simulation results show that the smaller the porosity of the rock material layer is, the more obvious the laminate crushing effect is, and the higher the crushing efficiency is, the smaller the porosity of the rock material layer is, the more obvious the laminate crushing effect is. The smaller the particle size and the flatter the shape of the rock, the more difficult it is to break up, that is to say, the quality of the broken product is worse. In the process of crushing, in order to ensure the dense state between the materials and restrain the occurrence of the "arch phenomenon", the rock material feeding quantity has an optimum value, that is, the height of the material layer is 520 mm;. According to the model of PYB900 cone crusher, there are some optimum breaking parameters, the optimum swing speed is 360r / min, the optimal swing stroke of fixed cone is 43 mm, the optimum rodent angle range is 23.5 掳~ 24.7 掳, and the optimum rodent angle range is 23.5 掳~ 24.7 掳. These parameters and ranges make the laminate crushing effect of the crusher the best.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD451
本文编号：2432242
[Abstract]:Laminar crushing refers to the crushing of bulk rock (ore) material when it is multi-layer distribution in the crushing chamber, that is, a large number of rock materials are gathered together, the external force acts on the material layer, and the transfer stress of the rock material layer makes the rock particles contact with each other. The interaction results in the fragmentation of rock particles. With the deepening of the theoretical research of crushing grinding and the improvement of practical technology application, the mechanism and law of laminate crushing are deeply studied. In order to realize the application of laminate crushing principle and parameter technology, It is of great significance to develop the theoretical basis of raising arch in order to realize a new type of laminated crushing equipment. The main work of this paper is as follows: (1) according to the working principle of cone crusher, the motion characteristics of moving cone and granular rock particles in the crusher are analyzed, based on the principle of laminate crushing. Delamination theory and fixed quality principle are put forward to study the lamination process of cone crusher. The mathematical models of the crushing function, the selection function and the lamination number of the laminate crushing process are established, and the physical properties of the bulk rock materials are further obtained. The working parameters and structural parameters of cone crusher are the essential factors affecting the process and effect of layer crushing of cone crusher. Based on the detailed analysis of the influencing factors on the process and effect of laminate crushing, a mathematical model of the influencing factors is established. (2) based on the actual working parameters and structural parameters of the PYB900 cone crusher, the mathematical model of the influencing factors is established. Using discrete element software EDEM and three-dimensional design software Solidworks, the three-dimensional model of laminated crushing of cone crusher is established. Based on BPM (adhesive particle model), the irregular, closer to true granite rock material model for crushing is established. Based on the model, the filling degree of the material layer in the crushing chamber satisfies the condition of the laminate crushing mode. The simulation of the laminate crushing process of the cone crusher is carried out, and the inherent law of the rock granular material layer being crushed in the crushing chamber is explored. It includes the characteristics of crushing state, motion state and stress state of rock material layer. (3) based on the model of cone crusher, the simulation experiment of the influence law of laminar crushing is designed. The particle size, grain shape and thickness of feed layer, working parameters of cone crusher, rotating speed of dynamic cone pendulum were studied. The effect of dynamic cone swing stroke and rodent angle of crusher on particle size quality and productivity of cone crusher is studied, and the effect of laminate crushing is evaluated from these two aspects. The simulation results show that the smaller the porosity of the rock material layer is, the more obvious the laminate crushing effect is, and the higher the crushing efficiency is, the smaller the porosity of the rock material layer is, the more obvious the laminate crushing effect is. The smaller the particle size and the flatter the shape of the rock, the more difficult it is to break up, that is to say, the quality of the broken product is worse. In the process of crushing, in order to ensure the dense state between the materials and restrain the occurrence of the "arch phenomenon", the rock material feeding quantity has an optimum value, that is, the height of the material layer is 520 mm;. According to the model of PYB900 cone crusher, there are some optimum breaking parameters, the optimum swing speed is 360r / min, the optimal swing stroke of fixed cone is 43 mm, the optimum rodent angle range is 23.5 掳~ 24.7 掳, and the optimum rodent angle range is 23.5 掳~ 24.7 掳. These parameters and ranges make the laminate crushing effect of the crusher the best.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD451
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