發(fā)布時(shí)間：2018-03-05 22:03

  本文選題：行走機(jī)構(gòu)　切入點(diǎn)：齒軌輪　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文分析了采煤機(jī)行走機(jī)構(gòu)的齒軌輪和銷排的失效情況,發(fā)現(xiàn)齒面磨損和輪齒斷裂是齒軌輪主要失效形式,齒軌輪失效導(dǎo)致行走機(jī)構(gòu)無法正常定位而加速銷排的損壞,上述情況在重載采煤機(jī)上尤為明顯。行走機(jī)構(gòu)失效的根本原因是齒軌輪設(shè)計(jì)強(qiáng)度薄弱和齒面耐磨性能低,故本課題針對上述主要失效原因入手,從節(jié)距和熱處理滲碳工藝兩方面來改善齒軌輪機(jī)械性能,達(dá)到提高行走機(jī)構(gòu)使用壽命的目的。以MG1000/2550-GWD采煤機(jī)作為研究對象進(jìn)行研究分析:節(jié)距設(shè)計(jì)方面,考慮到液壓支架、刮板輸送機(jī)和采煤機(jī)三者的配套關(guān)系,故在不改變刮板輸送機(jī)中部槽規(guī)格的前提下進(jìn)行設(shè)計(jì),將現(xiàn)有147mm大節(jié)距齒軌輪調(diào)整為176mm節(jié)距,并對新型齒軌輪進(jìn)行強(qiáng)度校核;滲碳工藝方面,為了增加齒面耐磨性,將滲層厚度增加到6mm以上,通過仿真和實(shí)驗(yàn)證明一次長時(shí)間滲碳改為3次連續(xù)短時(shí)間滲碳更有利于提高滲層質(zhì)量,主要研究工作如下:1.根據(jù)1750mm中部槽規(guī)格,通過計(jì)算確定將銷排節(jié)距調(diào)整為176mm;2.依據(jù)銷排和齒軌輪嚙合關(guān)系,結(jié)合漸開線齒輪設(shè)計(jì)原則,確定176mm節(jié)距齒軌輪參數(shù)并進(jìn)行強(qiáng)度校驗(yàn);3.將新型176mm節(jié)距與147mm節(jié)距進(jìn)行強(qiáng)度對比,計(jì)算后認(rèn)為強(qiáng)度提高11.7%;4.改進(jìn)齒軌輪的滲碳熱處理工藝,將強(qiáng)滲時(shí)間從一次125h調(diào)整為連續(xù)三次30h短時(shí)間強(qiáng)滲,考慮試驗(yàn)成本及試驗(yàn)時(shí)間,本文提前用Solidworks三維建模,Deform-3D軟件仿真模擬滲碳,仿真結(jié)束后,對比分析了滲碳過程中的滲層深度及不同位置的碳濃度變化情況;5.將新滲碳方案與舊工藝進(jìn)行實(shí)際試驗(yàn)對比,試驗(yàn)結(jié)果證明,新方案滲層可達(dá)到要求的6mm,說明方案的可行性,并將新、舊方案滲碳情況進(jìn)行對比,發(fā)現(xiàn)新工藝工件性能優(yōu)于舊工藝。
[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.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD421.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王培科;王維發(fā);王星;劉朝暉;徐凌雪;黎賢濵;;18Cr2Ni4WA電渣鋼與電爐鋼的組織與性能[J];理化檢驗(yàn)(物理分冊);2016年07期

2 王延忠;陳云龍;張祖智;陳燕燕;劉e，

本文編號：1572064