基于離散元的層壓破碎模型及破碎過(guò)程的研究
發(fā)布時(shí)間：2019-03-01 08:05
【摘要】：層壓破碎是指散體巖(礦)石物料在破碎腔內(nèi)呈多層分布時(shí)的受壓破碎,即大量巖石物料聚集在一起,外力作用于物料層,巖石物料層傳遞應(yīng)力使得巖石顆粒間相互接觸、相互作用而產(chǎn)生巖石顆粒群體性破碎。隨著破碎粉磨理論研究的深入和實(shí)踐技術(shù)應(yīng)用的提高,深入研究層壓破碎機(jī)理與規(guī)律,為實(shí)現(xiàn)層壓破碎原理與參數(shù)技術(shù)應(yīng)用,為實(shí)現(xiàn)新型層壓破碎設(shè)備的研發(fā)提拱理論依據(jù)具有重要的意義。本文所做的工作主要有:(1)根據(jù)圓錐破碎機(jī)工作原理,分析了動(dòng)錐和散體巖石物料顆粒在破碎腔內(nèi)的運(yùn)動(dòng)特性,基于層壓破碎原理、分層破碎理論和固定質(zhì)量原理提出了圓錐破碎機(jī)層壓破碎過(guò)程進(jìn)行分層研究;建立了層壓破碎過(guò)程關(guān)于破碎函數(shù)、選擇函數(shù)和層壓破碎分層數(shù)的數(shù)學(xué)模型,并且進(jìn)一步得出散體巖石物料物理特性、圓錐破碎機(jī)工作參數(shù)和結(jié)構(gòu)參數(shù)是影響圓錐破碎機(jī)層壓破碎過(guò)程和破碎效果的本質(zhì)因素;通過(guò)詳細(xì)分析各影響因素參數(shù)對(duì)層壓破碎過(guò)程與破碎效果的影響規(guī)律,建立了層壓破碎影響因素?cái)?shù)學(xué)模型。(2)以PYB900圓錐破碎機(jī)的實(shí)際工作參數(shù)與結(jié)構(gòu)參數(shù)為依據(jù),利用離散元軟件EDEM和三維設(shè)計(jì)軟件Solidworks建立了圓錐破碎機(jī)層壓破碎三維模型,并基于BPM(粘接顆粒模型)建立了用于破碎的不規(guī)則、更為接近真實(shí)的花崗巖巖石物料模型;基于該模型計(jì)算破碎腔內(nèi)物料層填充度滿足層壓破碎方式發(fā)生條件,對(duì)圓錐破碎機(jī)層壓破碎過(guò)程進(jìn)行了模擬仿真,探究了巖石顆粒物料層在破碎腔內(nèi)受壓破碎的內(nèi)在規(guī)律,其包括巖石物料層的破碎狀態(tài)、運(yùn)動(dòng)狀態(tài)及受力狀態(tài)的特點(diǎn)。(3)基于建立的圓錐破碎機(jī)層壓破碎模型,設(shè)計(jì)了層壓破碎影響規(guī)律模擬仿真實(shí)驗(yàn),研究了散體巖石物料的粒徑、粒形和給料層厚度,圓錐破碎機(jī)工作參數(shù)動(dòng)錐旋擺轉(zhuǎn)速,結(jié)構(gòu)參數(shù)動(dòng)錐擺動(dòng)行程和破碎腔嚙角分別對(duì)圓錐破碎機(jī)產(chǎn)品粒度質(zhì)量和生產(chǎn)率的影響變化規(guī)律,從這兩方面了評(píng)價(jià)層壓破碎效果,通過(guò)分析仿真結(jié)果得出結(jié)論有:在破碎腔內(nèi)的巖石物料層孔隙率越小,層壓破碎作用越明顯,破碎效率越高,而巖石物料粒徑越小和巖石粒形越扁平越難破碎即破碎產(chǎn)品質(zhì)量較差;在破碎過(guò)程中,為了保證物料間的密實(shí)狀態(tài),抑制“上拱現(xiàn)象”的產(chǎn)生,巖石物料給料量有一最佳值即料層高度為520 mm;針對(duì)PYB900圓錐破碎機(jī)模型存在些最佳破碎參數(shù)即動(dòng)錐最佳旋擺轉(zhuǎn)速為360 r/min,定錐最佳擺動(dòng)行程為43 mm,破碎腔存在最佳嚙角范圍為23.5°~24.7°,這些參數(shù)值和范圍使得破碎機(jī)層壓破碎效果最佳。
[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 擄~ 24.7 擄, and the optimum rodent angle range is 23.5 擄~ 24.7 擄. These parameters and ranges make the laminate crushing effect of the crusher the best.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD451
本文編號(hào)：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 擄~ 24.7 擄, and the optimum rodent angle range is 23.5 擄~ 24.7 擄. These parameters and ranges make the laminate crushing effect of the crusher the best.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD451
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