發(fā)布時間：2018-04-15 21:47

  本文選題：帶式輸送機 + 散狀物料　； 參考：《東北大學(xué)》2011年碩士論文

【摘要】：隨著工業(yè)和技術(shù)的發(fā)展,采用大運量、長距離、高帶速的大型帶式輸送機進行散狀物料輸送已成為帶式輸送機的發(fā)展主流。物料的沖擊是影響輸送機高速運轉(zhuǎn)的問題之一,所以,需要合理的確定物料的壓力分布情況并解決物料的沖擊問題。由于托輥數(shù)量眾多,帶式輸送機的性能參數(shù)與托輥性能有著密切的聯(lián)系,合理的選擇托輥非常重要。因此必須精確的確定物料在各托輥上的壓力分布情況來確定托輥所承受的載荷。 以散狀物料的特性為基礎(chǔ),基于散體連續(xù)模型的方法,分析物料在料倉內(nèi)的流動狀態(tài)。應(yīng)用朗肯(Rankine)土壓力理論,推導(dǎo)出存儲物料的料倉和卸料漏斗的壓力計算公式,為料倉和卸料漏斗的設(shè)計提供了一定的理論依據(jù)。 在考慮料倉、漏斗、導(dǎo)料槽裝置的影響下,分析物料不同的裝載方式并推導(dǎo)出物料裝載沖擊力的計算方法。分析裝載沖擊力對輸送機運行阻力的影響,在考慮沖擊力的情況下提出了物料剪切阻力這一運行阻力并給出了計算方法,重新推導(dǎo)了導(dǎo)料槽側(cè)板摩擦阻力的計算表達式。 分析槽形承載托輥上承載的物料情況,計算得到物料與輸送帶重力在各個托輥上的分配情況。建立托輥組受力模型,使用朗肯土壓力理論,推導(dǎo)出側(cè)托輥和中央托輥所受載荷的計算公式,精確的計算各托輥受載荷情況。并根據(jù)側(cè)托輥所受載荷情況給出新的托輥前傾阻力的計算方法。 結(jié)合實際算例,對帶式輸送機進行三維建模并使用EDEM軟件對輸送機的裝載及運行過程進行離散元模擬仿真。通過仿真結(jié)果與現(xiàn)行標準算法結(jié)果和文中算法結(jié)果對比,有力的驗證了文中推導(dǎo)出的導(dǎo)料槽阻力計算方法和物料在托輥上壓力分布計算的精確性。
[Abstract]:With the development of industry and technology, it has become the mainstream of belt conveyor to carry out bulk material transportation with large capacity, long distance and high belt speed.The impact of materials is one of the problems that affect the high speed running of conveyors, so it is necessary to reasonably determine the pressure distribution of materials and solve the impact problems of materials.Due to the large number of rollers, the performance parameters of belt conveyors are closely related to the performance of the rollers, so it is very important to select the rollers reasonably.Therefore, the pressure distribution of materials on each roller must be determined accurately to determine the load borne by the roller.Based on the characteristics of bulk materials and the method of continuous model, the flow state of materials in the silo is analyzed.Based on Rankine earth pressure theory, the formula for calculating the pressure of storage bin and discharge hopper is derived, which provides a certain theoretical basis for the design of hopper and discharge hopper.Considering the influence of silo, funnel and guide tank, the different loading modes of materials are analyzed and the calculation method of material loading impact force is deduced.This paper analyzes the influence of loading impact force on the running resistance of conveyer, puts forward the running resistance of material shear resistance under the consideration of impact force, and gives the calculation method, and derives the calculating expression of friction resistance of side plate of guide groove again.The distribution of the gravity between the material and the conveyor belt on each roller is calculated by analyzing the material loading on the groove bearing roller.Based on the Rankine earth pressure theory, the formulas for calculating the load of side roller and central roller are derived, and the load of each roller is calculated accurately.According to the load of side roller, a new calculation method of roll forward resistance is given.Combined with practical examples, the three-dimensional modeling of belt conveyor is carried out, and the discrete element simulation of loading and running process of belt conveyor is carried out by using EDEM software.The simulation results are compared with the results of the current standard algorithm and the algorithm in this paper, and the accuracy of the calculation of the resistance of the guide groove and the pressure distribution of the material on the roller is verified.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH222

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本文編號：1755954