本文選題：散煤料 + 中部槽　； 參考：《太原理工大學》2017年碩士論文

【摘要】：刮板輸送機是散料運輸?shù)年P鍵設備,而中部槽又是刮板輸送機的關鍵部件,其設計的合理性與可靠性關乎著刮板輸送機的運行效率與使用壽命。近年來隨著重載刮板輸送機的大量使用,刮板輸送機中部槽的磨損問題表現(xiàn)得更為突出,但是由于刮板輸送機的中部槽重量較重,更換麻煩,所以研究刮板輸送機中部槽在散料物體作用下的受力特性以及磨損特性具有十分重要意義,本論文采用理論、仿真、實驗相結合的研究方法,以中部槽的耐磨要求為研究目標,具體研究了散煤料對中部槽的沖擊和摩擦作用,為提高刮板輸送機中部槽的使用壽命提供一定的指導。本論文以刮板輸送機中部槽摩擦副的關鍵部件和散煤料作為研究對象,基于煤散料的散體特性,從理論計算的角度分析了中部槽在沖擊作用和三體摩擦作用下的磨損特性,得到了磨損影響因素;進一步結合EDEM離散元仿真軟件建立了中部槽摩擦副的仿真模型,并從顆粒分布狀態(tài)與主要磨損區(qū)域驗證了仿真模型的正確性。為了進一步分析不同區(qū)域中部槽的受力與磨損,在落煤區(qū)域與運輸區(qū)域,通過控制變量法研究了中部槽在不同結構形式、不同煤料屬性、不同工況下的受力與磨損特性,發(fā)現(xiàn)了運輸區(qū)域中部槽的磨損主要集中在刮板輸送機運輸散煤料的鏈道處;不同影響因素在落煤區(qū)域和運輸區(qū)域對中部槽磨損和受力特性的影響并不完全相同,提出了刮板輸送機在不同情況下的耐磨方案。對鏈道處的的磨損進行了微觀模擬實驗研究,選取了典型的褐煤、焦煤、無煙煤三種煤料作為三體摩擦介質,分析了16Mn(中部槽中板材料)和40Cr(刮板鏈材料)在不同煤料作為摩擦介質的情況下,正壓力與滑動速度對摩擦系數(shù)與磨損量的影響,得到了無煙煤作為摩擦介質時的磨損最大,而且在正壓力逐漸增大的情況下磨損逐漸增大,但隨著滑動速度的增大,磨損先增大后減小;中板材料表面磨損形貌主要是磨粒磨損產(chǎn)生的犁溝,在顆粒較大時,犁溝寬度和深度都較大,當煤散料粒度達到40目左右時,粒度繼續(xù)增大不會顯著影響磨損量的變化。
[Abstract]:Scraper conveyor is the key equipment of bulk transportation, and the middle slot is the key component of scraper conveyor. The rationality and reliability of its design is related to the efficiency and service life of scraper conveyor. In recent years, with the extensive use of heavy load scraper conveyor, the wear problem of the middle slot of scraper conveyor is more prominent, but because of the heavy weight of the middle slot of scraper conveyor, it is difficult to replace. Therefore, it is of great significance to study the mechanical characteristics and wear characteristics of the middle slot of scraper conveyor under the action of bulk material. This paper adopts the research method of combining theory, simulation and experiment, and takes the wear-resisting requirement of the middle slot as the research goal. The impact and friction of loose coal on the middle slot are studied in detail, which provides some guidance for improving the service life of the middle slot of scraper conveyor. In this paper, the key parts of the friction pair of the middle slot of the scraper conveyor and the bulk coal material are taken as the research object. Based on the characteristics of the coal bulk, the wear characteristics of the middle slot under the impact and the three-body friction are analyzed from the angle of theoretical calculation. The influence factors of wear are obtained, and the simulation model of the middle slot friction pair is established with the EDEM discrete element simulation software, and the correctness of the simulation model is verified from the particle distribution state and the main wear region. In order to further analyze the force and wear of the middle groove in different areas, the stress and wear characteristics of the middle slot under different structure forms, different coal properties and different working conditions were studied by controlling variable method in the coal falling area and transportation area. It is found that the wear of the middle groove in the transportation area is mainly concentrated in the chain path of the scraper conveyor to transport the bulk coal, and the influence of different factors on the wear and mechanical characteristics of the middle slot is not completely the same in the coal falling area and the transportation area. The wear resistance scheme of scraper conveyor under different conditions is put forward. In this paper, the wear of chain channel is studied by microscopic simulation experiment. Three kinds of coal materials, such as lignite, coking coal and anthracite, are selected as tri-body friction medium. The effects of positive pressure and sliding velocity on friction coefficient and wear quantity of 16Mnand 40Cr-scraper are analyzed in the case of different coal materials as friction medium. The results show that anthracite has the greatest wear when it is used as friction medium. With the increasing of positive pressure, the wear increases gradually, but with the increase of sliding speed, the wear increases first and then decreases. The width and depth of ploughing ditch are both large. When the particle size of coal powder reaches about 40 mesh, the increase of grain size will not significantly affect the change of wear quantity.
【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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