【摘要】：隨著刮板輸送機向大功率、重型、超重型方向發(fā)展,驅(qū)動鏈輪的過度磨損是導致刮板輸送機失效的主要形式。驅(qū)動鏈輪作為刮板輸送機鏈傳動系統(tǒng)的核心部件,對刮板輸送機的可靠性和運行壽命有著重要影響。對驅(qū)動鏈輪的結(jié)構進行優(yōu)化設計,有助于降低驅(qū)動鏈輪的磨損,提高鏈傳動系統(tǒng)的可靠性,提升刮板輸送機的運行效率和使用壽命。論文首先對圓環(huán)鏈與驅(qū)動鏈輪的嚙合接觸過程進行了受力分析,計算了刮板輸送機的運行阻力。使用有限元分析軟件ANSYS/LS-DYNA進行了圓環(huán)鏈與驅(qū)動鏈輪嚙合接觸分析,得出驅(qū)動鏈輪鏈窩在靠近立環(huán)槽部位受力最大,為驅(qū)動鏈輪的結(jié)構參數(shù)優(yōu)化奠定了基礎。然后將正交優(yōu)化設計方法引入到了驅(qū)動鏈輪的結(jié)構參數(shù)優(yōu)化中。提取了驅(qū)動鏈輪四個關鍵的結(jié)構參數(shù):齒型圓弧半徑、鏈窩弧半徑、短齒厚度、鏈窩長度;使用正交優(yōu)化設計方案,得出影響驅(qū)動鏈輪嚙合接觸狀態(tài)的四個結(jié)構參數(shù)的最優(yōu)組合以及對驅(qū)動鏈輪最大應力的影響規(guī)律。利用LS-DYNA對圓環(huán)鏈(?14?50)與優(yōu)化后驅(qū)動鏈輪進行了接觸分析,對比優(yōu)化前后驅(qū)動鏈輪的分析結(jié)果,優(yōu)化后驅(qū)動鏈輪最大應變減小2.586%,最大應力減小2.869%。最后,使用自主設計刮板輸送機(SGB420/17)模擬試驗臺進行了優(yōu)化前后驅(qū)動鏈輪的磨損試驗。通過對比分析優(yōu)化前后驅(qū)動鏈輪的磨損量和表面形貌,發(fā)現(xiàn)在相同試驗條件下,優(yōu)化后驅(qū)動鏈輪鏈窩的表面形貌更優(yōu);優(yōu)化后的驅(qū)動鏈輪磨損量降低了24.2%,在相同磨損量情況下,優(yōu)化后驅(qū)動鏈輪運行時間提高了16.7%。從理論與試驗方面驗證了正交優(yōu)化結(jié)果的有效性,優(yōu)化了驅(qū)動鏈輪的結(jié)構參數(shù),減緩了驅(qū)動鏈輪的磨損,延長了驅(qū)動鏈輪使用壽命。
[Abstract]:With the development of scraper conveyor in the direction of high power, heavy duty and super heavy duty, excessive wear of driving sprocket is the main form of scraper conveyor failure. As the core part of the chain drive system of scraper conveyor, the driving sprocket has an important influence on the reliability and service life of scraper conveyor. Optimizing the structure of the drive sprocket is helpful to reduce the wear of the drive sprocket, improve the reliability of the chain drive system, and improve the efficiency and service life of the scraper conveyor. Firstly, the force of the contact process between the circular chain and the driving sprocket is analyzed, and the running resistance of the scraper conveyor is calculated. The meshing contact analysis of circular chain and drive sprocket is carried out by using ANSYS / LS-DYNA software. The results show that the driving sprocket chain has the largest force near the vertical ring slot, which lays a foundation for the optimization of structural parameters of the drive sprocket. Then the orthogonal optimization method is introduced to the structural parameter optimization of the drive sprocket. Four key structural parameters of driving sprocket are extracted: tooth arc radius, chain pit arc radius, short tooth thickness, length of chain socket. The optimal combination of the four structural parameters affecting the meshing contact state of the drive sprocket and the law of its influence on the maximum stress of the driving sprocket are obtained. Using LS-DYNA, the contact analysis between the circular chain and the optimized sprocket is carried out. The results of the analysis before and after the optimization are compared. The maximum strain of the driven sprocket is reduced by 2.586and the maximum stress is reduced by 2.869. Finally, the wear test of the sprocket driven before and after optimization was carried out by using the self-designed scraper conveyor (SGB420 / 17). By comparing and analyzing the wear amount and surface morphology of the drive sprocket before and after optimization, it is found that under the same experimental conditions, the surface morphology of the drive sprocket nest is better after the optimization, and the wear quantity of the optimized drive sprocket is reduced by 24.2g, under the condition of the same wear amount, The running time of the drive sprocket is increased by 16.7g after optimization. The validity of the orthogonal optimization results is verified theoretically and experimentally. The structural parameters of the drive sprocket are optimized, the wear of the drive sprocket is slowed down, and the service life of the driving sprocket is prolonged.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD528.3

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