本文選題：導(dǎo)向滑靴　切入點(diǎn)：耐磨材料　出處：《煤炭科學(xué)研究總院》2017年碩士論文

【摘要】：導(dǎo)向滑靴是采煤機(jī)上重要的零部件,在采煤機(jī)上起到了支撐和導(dǎo)向的作用,其正常與否,直接影響著采煤機(jī)的正常運(yùn)行。在實(shí)際的井下作業(yè)時(shí),由于環(huán)境的惡劣多變,使得采煤機(jī)導(dǎo)向滑靴不斷受到?jīng)_擊載荷的作用,并且導(dǎo)向滑靴的導(dǎo)向面與導(dǎo)軌的接觸面之間是無油干摩擦狀態(tài),因此導(dǎo)向滑靴磨損嚴(yán)重,需要經(jīng)常檢修或者直接更換新的導(dǎo)向滑靴,不僅降低了采煤機(jī)的使用壽命,更加降低了采煤效率。所以對(duì)導(dǎo)向滑靴的強(qiáng)度和耐磨性的分析是非常有必要的。本文通過靜力學(xué)理論,對(duì)采煤機(jī)的整機(jī)進(jìn)行了力學(xué)分析,求解出導(dǎo)向滑靴的受力情況;并運(yùn)用此受力,通過有限元仿真軟件對(duì)導(dǎo)向滑靴進(jìn)行了接觸應(yīng)力、摩擦應(yīng)力以及摩擦狀態(tài)的仿真,并對(duì)導(dǎo)向滑靴的強(qiáng)度進(jìn)行了校核;實(shí)際生產(chǎn)中,導(dǎo)向滑靴的導(dǎo)向面由于摩擦,會(huì)產(chǎn)生一定的高溫。由于采煤機(jī)在作業(yè)時(shí)推進(jìn)速度較低,故導(dǎo)向滑靴的散熱方式主要以熱傳導(dǎo)和自然對(duì)流換熱為主。結(jié)合傳熱學(xué)理論知識(shí),解算出適合采煤機(jī)井下作業(yè)時(shí)的對(duì)流換熱系數(shù),運(yùn)用有限元仿真軟件的溫度仿真模塊,對(duì)導(dǎo)向滑靴工作時(shí)的溫度場(chǎng)進(jìn)行了仿真;理論分析了采煤機(jī)的磨損機(jī)理,并通過模型計(jì)算出導(dǎo)向滑靴堆焊層的厚度范圍,選取三種常見的導(dǎo)向滑靴堆焊材料進(jìn)行了摩擦磨損實(shí)驗(yàn)。本文通過以上的分析,得出如下結(jié)論:(1)不同工況條件,采煤機(jī)整機(jī)的受力各不相同,其中采煤機(jī)導(dǎo)向滑靴的受力主要受煤層傾角及采煤機(jī)仰俯采角影響,且煤層傾角對(duì)采煤機(jī)整機(jī)受力的影響最為顯著。(2)導(dǎo)向滑靴在運(yùn)行中會(huì)受到較大的等效應(yīng)力和接觸應(yīng)力。由于有較大的接觸應(yīng)力,導(dǎo)向滑靴在工作中與銷軌有一定的粘連,會(huì)在接觸面上形成剝落,從而加速了導(dǎo)向滑靴耐磨層的磨損。(3)采煤機(jī)工作時(shí),導(dǎo)向滑靴的溫度場(chǎng)復(fù)雜,極端工況下會(huì)產(chǎn)生近150℃的高溫,使導(dǎo)向滑靴材料的內(nèi)部組織發(fā)生相變,從而降低材料的硬度,使耐磨性降低,加速了導(dǎo)向滑靴的磨損。(4)導(dǎo)向滑靴耐磨層磨損機(jī)理為磨粒磨損和黏著磨損,溫度和壓力對(duì)導(dǎo)向滑靴耐磨層的耐磨性影響很大,通過耐磨性實(shí)驗(yàn),當(dāng)選用D、E作為導(dǎo)向滑靴耐磨材料時(shí),采煤機(jī)在運(yùn)行150～200公里時(shí),可考慮對(duì)導(dǎo)向滑靴進(jìn)行檢修。
[Abstract]:Guide slipper is an important part of shearer, which plays a supporting and guiding role in shearer. Its normal or not directly affects the normal operation of shearer.In the actual downhole operation, because of the harsh and changeable environment, the shearer's guide slipper is continuously subjected to the impact load, and there is no oil dry friction between the guide surface of the guide shoe and the contact surface of the guide rail.Therefore, the wear of the guide slipper is serious, it needs to be overhauled or replaced directly, which not only reduces the service life of the shearer, but also reduces the coal mining efficiency.Therefore, it is necessary to analyze the strength and wear resistance of the guide skates.In this paper, the mechanical analysis of the whole shearer is carried out by statics theory, and the stress of the guide slide shoe is solved, and the contact stress of the guide slide shoe is carried out by using the finite element simulation software.The friction stress and friction state are simulated, and the strength of the guide slipper is checked. In actual production, the guide surface of the guide shoe will produce a certain high temperature because of friction.Because of the low speed of the shearer in operation, the heat transfer mode of the guide slipper is mainly heat conduction and natural convection heat transfer.Combined with the knowledge of heat transfer theory, the convection heat transfer coefficient suitable for underground operation of shearer is solved. The temperature field of guide slipper is simulated by using the temperature simulation module of finite element simulation software.The wear mechanism of the shearer is analyzed theoretically, and the thickness range of the surfacing layer of the guide slipper is calculated by the model. The friction and wear experiments are carried out by selecting three kinds of common materials for the guide slipper surfacing welding.Based on the above analysis, the following conclusions are drawn: (1) under different working conditions, the force of shearer's whole machine is different, and the force of shearer's guide slipper is mainly affected by the inclined angle of coal seam and the upside-down angle of shearer.Moreover, the influence of coal seam inclination angle on the force of shearer is the most obvious. (2) the guide slipper will be subjected to larger equivalent stress and contact stress in operation.Because of the large contact stress, the guide slipper has a certain adhesion with the pin rail in the work, which will form spalling on the contact surface, thus accelerating the wear of the wear-resistant layer of the guide slipper. 3) when the shearer is working, the temperature field of the guide slide shoe is complex.Under extreme conditions, high temperatures of nearly 150 鈩，

本文編號(hào)：1718803