【摘要】：齒輪箱是煤炭礦井必不可少的配套設(shè)備,擔(dān)負(fù)著煤炭、材料等動力傳輸?shù)闹匾蝿?wù)。煤礦所使用國產(chǎn)的減速器結(jié)構(gòu)已不盡合理,減速器齒輪傳動比的分配,對減速器的結(jié)構(gòu)、體積和重量,以及工作性能具有顯著的影響,優(yōu)化設(shè)計(jì)的關(guān)鍵在于滿足強(qiáng)度指標(biāo)實(shí)現(xiàn)減速器輕量化的同時(shí)提高其可靠性。本文根據(jù)齒輪箱系統(tǒng)配比的方法,建立齒輪傳動系統(tǒng)的優(yōu)化設(shè)計(jì)模型。煤礦用減速器在井下的運(yùn)轉(zhuǎn)條件極其惡劣,安裝維護(hù)困難,在這種工況條件下,齒輪箱報(bào)廢周期短,齒輪箱的可靠性直接影響生產(chǎn)、經(jīng)濟(jì)和人身安全的問題。由于齒輪產(chǎn)品不具備大樣本試驗(yàn)的條件,所面臨的可靠性分析問題非常突出,因此需要迫切提高齒輪箱的可靠性。本文基于蒙特卡洛法對齒輪的疲勞強(qiáng)度進(jìn)行可靠性分析,解決了齒輪可靠性分析的疲勞壽命試驗(yàn)數(shù)據(jù)不足的問題,為可靠性分析奠定了一定的理論基礎(chǔ)。1基于等強(qiáng)度、等潤滑條件對減速器傳動系統(tǒng)進(jìn)行優(yōu)化,本文將弧齒錐齒輪同圓柱齒輪分開優(yōu)化,錐齒輪的參數(shù)選擇從小齒輪強(qiáng)度、大齒輪直徑、傳動比三個限制條件進(jìn)行優(yōu)化設(shè)計(jì)。圓柱齒輪優(yōu)化采用逐步優(yōu)化的方法,即兩級圓柱齒輪一次接觸強(qiáng)度優(yōu)化和再次綜合優(yōu)化設(shè)計(jì)的方法。第一步優(yōu)化確定模數(shù);第二步優(yōu)化,引進(jìn)變位系數(shù)、齒形系數(shù)、彎曲強(qiáng)度完成綜合優(yōu)化計(jì)算。這種方法能夠較好地滿足齒輪傳動的潤滑條件、強(qiáng)度、壽命的設(shè)計(jì)要求。2基于齒輪強(qiáng)度計(jì)算標(biāo)準(zhǔn)及應(yīng)力-強(qiáng)度干涉模型,本文建立齒輪的彎曲疲勞、接觸疲勞、膠合的可靠度計(jì)算模型。本文用蒙特卡洛法產(chǎn)生隨機(jī)數(shù)對齒輪的接觸強(qiáng)度、彎曲強(qiáng)度和膠合的可靠度進(jìn)行計(jì)算,并模擬出計(jì)算應(yīng)力和許用應(yīng)力的分布類型,齒輪計(jì)算彎曲應(yīng)力服從正態(tài)分布,許用彎曲應(yīng)力服從對數(shù)正態(tài)分布;齒輪計(jì)算接觸應(yīng)力服從正態(tài)分布,許用接觸應(yīng)力服從對數(shù)正態(tài)分布。最后,采用串聯(lián)系統(tǒng)的可靠性模型計(jì)算系統(tǒng)可靠度,與多模式失效相關(guān)理論計(jì)算出的系統(tǒng)可靠度進(jìn)行對比,兩者非常接近,從而驗(yàn)證了蒙特卡洛法計(jì)算的準(zhǔn)確性。3本文在對齒輪幾何設(shè)計(jì)、強(qiáng)度計(jì)算、可靠性分析理論研究的基礎(chǔ)上,基于MATLAB編程工具,開發(fā)了齒輪幾何參數(shù)計(jì)算與可靠性分析程序,并用實(shí)例驗(yàn)證優(yōu)化設(shè)計(jì)參數(shù)的正確性。本文設(shè)置人性化交互界面,節(jié)省時(shí)間,使計(jì)算效率大大提高。
[Abstract]:Gearbox is an indispensable supporting equipment in coal mine, which shoulders the important task of power transmission such as coal and materials. The structure of domestic reducer used in coal mine has been unreasonable. The distribution of gear transmission ratio of reducer has a significant effect on the structure, volume and weight of reducer, as well as its working performance. The key of optimal design is to meet the intensity index to realize the lightening of the reducer and to improve its reliability. In this paper, the optimal design model of gear transmission system is established according to the method of gearbox system ratio. The working condition of the reducer used in coal mine is extremely bad and the installation and maintenance are difficult. Under this condition, the cycle of the gear box is short, and the reliability of the gear box has a direct impact on the production, economy and personal safety. Because the gear product does not have the condition of large sample test and the reliability analysis problem is very prominent, it is urgent to improve the reliability of the gear box. In this paper, the reliability analysis of gear fatigue strength based on Monte Carlo method is carried out, which solves the problem of insufficient fatigue life test data of gear reliability analysis, and lays a certain theoretical foundation for reliability analysis based on equal strength. In this paper, the arc bevel gear is optimized separately from the cylindrical gear, and the parameters of the bevel gear are optimized by three limiting conditions: small gear strength, large gear diameter and transmission ratio. The method of step by step optimization is adopted in the optimization of cylindrical gears, that is, the optimization of the primary contact strength of two-stage cylindrical gears and the re-comprehensive optimization design. The first step optimizes the determination of modulus, the second step optimizes the introduction of displacement coefficient, tooth shape coefficient and bending strength to complete the comprehensive optimization calculation. This method can satisfy the lubrication conditions of gear transmission, strength and life design requirements .2 based on gear strength calculation standard and stress-strength interference model, this paper establishes the bending fatigue and contact fatigue of gear. The reliability calculation model of gluing. In this paper, Monte Carlo method is used to generate random numbers to calculate the contact strength, bending strength and reliability of gluing of gears, and the distribution types of calculated stress and allowable stress are simulated. The allowable bending stress suit is logarithmic normal distribution, the gear contact stress suit is normal distribution, and the allowable contact stress suit is logarithmic normal distribution. Finally, the reliability model of series system is used to calculate the reliability of the system, and the reliability of the system is compared with that calculated by the theory of multi-mode failure correlation. The two models are very close to each other. Therefore, the accuracy of Monte Carlo method is verified. 3. Based on the theoretical research of gear geometry design, strength calculation and reliability analysis, and based on MATLAB programming tool, a gear geometric parameter calculation and reliability analysis program is developed in this paper. An example is given to verify the correctness of the optimized design parameters. This article sets the humanized interactive interface, saves the time, causes the computation efficiency to raise greatly.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD402

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