散煤料对中部槽冲击与摩擦作用的研究

发布时间：2018-05-07 11:33

本文选题：散煤料 + 中部槽　；参考：《太原理工大学》2017年硕士论文

【摘要】：刮板输送机是散料运输的关键设备,而中部槽又是刮板输送机的关键部件,其设计的合理性与可靠性关乎着刮板输送机的运行效率与使用寿命。近年来随着重载刮板输送机的大量使用,刮板输送机中部槽的磨损问题表现得更为突出,但是由于刮板输送机的中部槽重量较重,更换麻烦,所以研究刮板输送机中部槽在散料物体作用下的受力特性以及磨损特性具有十分重要意义,本论文采用理论、仿真、实验相结合的研究方法,以中部槽的耐磨要求为研究目标,具体研究了散煤料对中部槽的冲击和摩擦作用,为提高刮板输送机中部槽的使用寿命提供一定的指导。本论文以刮板输送机中部槽摩擦副的关键部件和散煤料作为研究对象,基于煤散料的散体特性,从理论计算的角度分析了中部槽在冲击作用和三体摩擦作用下的磨损特性,得到了磨损影响因素;进一步结合EDEM离散元仿真软件建立了中部槽摩擦副的仿真模型,并从颗粒分布状态与主要磨损区域验证了仿真模型的正确性。为了进一步分析不同区域中部槽的受力与磨损,在落煤区域与运输区域,通过控制变量法研究了中部槽在不同结构形式、不同煤料属性、不同工况下的受力与磨损特性,发现了运输区域中部槽的磨损主要集中在刮板输送机运输散煤料的链道处;不同影响因素在落煤区域和运输区域对中部槽磨损和受力特性的影响并不完全相同,提出了刮板输送机在不同情况下的耐磨方案。对链道处的的磨损进行了微观模拟实验研究,选取了典型的褐煤、焦煤、无烟煤三种煤料作为三体摩擦介质,分析了16Mn(中部槽中板材料)和40Cr(刮板链材料)在不同煤料作为摩擦介质的情况下,正压力与滑动速度对摩擦系数与磨损量的影响,得到了无烟煤作为摩擦介质时的磨损最大,而且在正压力逐渐增大的情况下磨损逐渐增大,但随着滑动速度的增大,磨损先增大后减小;中板材料表面磨损形貌主要是磨粒磨损产生的犁沟,在颗粒较大时,犁沟宽度和深度都较大,当煤散料粒度达到40目左右时,粒度继续增大不会显著影响磨损量的变化。
[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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD528.3

【参考文献】