【摘要】：為了防止大塊截割煤堵塞采煤機(jī)機(jī)身下面的過煤空間,需在其牽引部迎著煤流的端頭配置相應(yīng)的破碎機(jī)構(gòu)。但由于其工作環(huán)境十分惡劣,尤其在進(jìn)料量過大的情況下,一旦齒身磨損或者發(fā)生齒根斷裂,造成大塊物料跑粗,未被破碎的煤塊堆積在機(jī)載破碎機(jī)前部,直接影響破碎滾筒的破碎效果和運(yùn)行的穩(wěn)定性、拖慢采煤進(jìn)度,嚴(yán)重時(shí)甚至需要停機(jī)檢修。因此,為了在延長破碎截齒使用壽命的同時(shí),對其結(jié)構(gòu)尺寸進(jìn)行優(yōu)化以達(dá)到提高截齒使用效率的目的,有必要進(jìn)行破碎截齒的等壽命優(yōu)化設(shè)計(jì)研究。目前對于礦用截齒的研究主要集中于截割部截割滾筒上的截割截齒,而對于破碎截齒的結(jié)構(gòu)優(yōu)化和壽命設(shè)計(jì)的研究涉及較少。本文主要致力于對破碎截齒齒根彎曲和齒身磨損的等壽命優(yōu)化研究。主要進(jìn)行了如下工作:(1)根據(jù)相關(guān)疲勞理論的經(jīng)驗(yàn)公式,通過計(jì)算得到齒身磨損與齒根彎曲疲勞壽命之間的相互聯(lián)系,即等壽命優(yōu)化系數(shù)K的表達(dá)式。(2)利用MATLAB軟件通過粒子群優(yōu)化算法對破碎截齒進(jìn)行以等壽命為目標(biāo)的結(jié)構(gòu)疲勞壽命優(yōu)化,得到了在約束條件范圍內(nèi)的截齒最優(yōu)尺寸和安裝角度。(3)對優(yōu)化后的截齒進(jìn)行仿真實(shí)驗(yàn),驗(yàn)證優(yōu)化效果。通過有限元軟件ANSYS進(jìn)行分析,得出破碎截齒在各個(gè)位置的受到應(yīng)力情況和變形情況,對強(qiáng)度進(jìn)行校核;并運(yùn)用FATIGUE模塊進(jìn)行相應(yīng)的疲勞計(jì)算,驗(yàn)證優(yōu)化是否達(dá)到預(yù)期要求。(4)為方便對相關(guān)理論數(shù)據(jù)進(jìn)行驗(yàn)證,對破碎截齒斷裂失效監(jiān)測系統(tǒng)進(jìn)行了探索性設(shè)計(jì)。
[Abstract]:In order to prevent large blocks of cutting coal from blocking the coal space under the shearer fuselage, it is necessary to install the corresponding crushing mechanism at the end of the tractive part facing the coal flow. However, due to its very bad working environment, especially in the case of excessive feed volume, once the tooth body is worn or the tooth root is broken, the bulk of the material runs thick, and the unbroken coal blocks accumulate in the front of the airborne crusher. It directly affects the crushing effect and operation stability of the crushing drum, slows down the progress of coal mining, and even needs to be stopped and overhauled when it is serious. Therefore, in order to prolong the service life of the broken cutter and optimize its structure and size to improve the efficiency of the cutter, it is necessary to study the optimal design of the equal life of the broken cutter. At present, the research on mine cutter is mainly focused on the cutting cutter on the drum in the cutting part, but the research on the structural optimization and life design of the broken cutter is less involved. The purpose of this paper is to study the equal-life optimization of tooth root bending and tooth body wear of broken cutter. The main work is as follows: (1) according to the empirical formula of relevant fatigue theory, the relationship between tooth body wear and tooth root bending fatigue life is obtained by calculating the relationship between tooth body wear and tooth root bending fatigue life. That is, the expression of equal life optimization coefficient K. (2) the structure fatigue life optimization with equal life is carried out by particle swarm optimization (PSO) algorithm with MATLAB software, and the structure fatigue life is optimized by using particle swarm optimization (PSO) algorithm. The optimal size and installation angle of the cutter are obtained in the range of constraints. (3) the optimized cutter is simulated to verify the optimization effect. Through the analysis of finite element software ANSYS, the stress and deformation of the broken cutter in each position are obtained, and the strength is checked. The fatigue calculation is carried out by using the FATIGUE module to verify whether the optimization meets the expected requirements. (4) in order to verify the relevant theoretical data, an exploratory design of the failure monitoring system for the fracture of the broken cutter is carried out in order to facilitate the verification of the relevant theoretical data.
【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】：2015
【分類號】：TD421.6;TP18

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