重载采煤机行走机构关键技术研究

发布时间：2018-03-05 22:03

本文选题：行走机构　切入点：齿轨轮　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文分析了采煤机行走机构的齿轨轮和销排的失效情况,发现齿面磨损和轮齿断裂是齿轨轮主要失效形式,齿轨轮失效导致行走机构无法正常定位而加速销排的损坏,上述情况在重载采煤机上尤为明显。行走机构失效的根本原因是齿轨轮设计强度薄弱和齿面耐磨性能低,故本课题针对上述主要失效原因入手,从节距和热处理渗碳工艺两方面来改善齿轨轮机械性能,达到提高行走机构使用寿命的目的。以MG1000/2550-GWD采煤机作为研究对象进行研究分析:节距设计方面,考虑到液压支架、刮板输送机和采煤机三者的配套关系,故在不改变刮板输送机中部槽规格的前提下进行设计,将现有147mm大节距齿轨轮调整为176mm节距,并对新型齿轨轮进行强度校核;渗碳工艺方面,为了增加齿面耐磨性,将渗层厚度增加到6mm以上,通过仿真和实验证明一次长时间渗碳改为3次连续短时间渗碳更有利于提高渗层质量,主要研究工作如下:1.根据1750mm中部槽规格,通过计算确定将销排节距调整为176mm;2.依据销排和齿轨轮啮合关系,结合渐开线齿轮设计原则,确定176mm节距齿轨轮参数并进行强度校验;3.将新型176mm节距与147mm节距进行强度对比,计算后认为强度提高11.7%;4.改进齿轨轮的渗碳热处理工艺,将强渗时间从一次125h调整为连续三次30h短时间强渗,考虑试验成本及试验时间,本文提前用Solidworks三维建模,Deform-3D软件仿真模拟渗碳,仿真结束后,对比分析了渗碳过程中的渗层深度及不同位置的碳浓度变化情况;5.将新渗碳方案与旧工艺进行实际试验对比,试验结果证明,新方案渗层可达到要求的6mm,说明方案的可行性,并将新、旧方案渗碳情况进行对比,发现新工艺工件性能优于旧工艺。
[Abstract]:In this paper, the failure of the gear rail wheel and pin row of the shearer's walking mechanism is analyzed. It is found that tooth surface wear and gear tooth fracture are the main failure forms of the gear rail wheel, and the failure of the tooth rail wheel causes the failure of the walking mechanism to be unable to locate normally and the damage of the accelerating pin row. The above situation is especially obvious on the heavy duty shearer. The fundamental reason of the failure of the walking mechanism is the weak design strength of the gear rail wheel and the low wear resistance of the tooth surface. From two aspects of pitch and heat treatment Carburizing process to improve the mechanical properties of the gear rail wheel, to achieve the purpose of increasing the service life of the walking mechanism. Taking MG1000/2550-GWD shearer as the research object, this paper makes research and analysis: in the aspect of pitch design, considering the hydraulic support, Because of the matching relationship between scraper conveyor and shearer, without changing the specifications of the middle slot of scraper conveyor, the 147mm large pitch tooth rail wheel is adjusted to 176mm pitch, and the strength of the new gear rail wheel is checked. In Carburizing process, in order to increase the wear resistance of tooth surface, the thickness of carburized layer is increased to more than 6mm. It is proved by simulation and experiment that it is more advantageous to improve the quality of carburizing layer by changing the carburizing time from one long time to three continuous and short time Carburizing. The main research work is as follows: 1. According to the specification of 1750mm middle slot, it is determined by calculation to adjust the pitch of pin and row to 176mm / 2.According to the meshing relation between pin row and tooth rail wheel, combined with the design principle of involute gear, The parameters of 176mm pitch tooth rail wheel are determined and the strength check is carried out. The strength of the new type 176mm pitch is compared with the 147mm pitch. The strength of the gear rail wheel is improved by 11.7mm and 44.The Carburizing heat treatment process of the gear rail wheel is improved. By adjusting the time of strong seepage from 125h to 30h, considering the test cost and test time, this paper simulates Carburizing with Solidworks 3D modeling software Deform-3D, and after the simulation is finished. The depth of carburizing layer and the change of carbon concentration in different positions are compared. The new Carburizing scheme is compared with the old process. The experimental results show that the new scheme can reach the required 6 mm, which shows the feasibility of the new scheme. The new and old Carburizing schemes are compared, and it is found that the performance of the new process is better than that of the old process.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD421.6

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