發(fā)布時(shí)間：2018-05-03 06:15

  本文選題：地下鏟運(yùn)機(jī) + 正轉(zhuǎn)六連桿工作機(jī)構(gòu)��； 參考：《山東理工大學(xué)》2017年碩士論文

【摘要】：地下鏟運(yùn)機(jī)是地下礦山無(wú)軌采掘作業(yè)必備的主體設(shè)備之一,依靠工作機(jī)構(gòu)的運(yùn)動(dòng)來(lái)完成物料的裝、運(yùn)、卸。目前,工作機(jī)構(gòu)均采用了焊接結(jié)構(gòu),焊縫的結(jié)構(gòu)形式、焊接質(zhì)量都直接影響著工作機(jī)構(gòu)的強(qiáng)度。本文以2m3地下鏟運(yùn)機(jī)的工作機(jī)構(gòu)為例,基于不同焊接形式、質(zhì)量,對(duì)正轉(zhuǎn)六連桿機(jī)構(gòu)進(jìn)行強(qiáng)度和動(dòng)力學(xué)研究分析,以獲得正轉(zhuǎn)六桿機(jī)構(gòu)工作狀態(tài)下的強(qiáng)度分布規(guī)律及動(dòng)力學(xué)特性。論文的主要工作如下:(1)研究了正轉(zhuǎn)六連桿工作機(jī)構(gòu)在插入和鏟取工況下的受力狀況,獲得了兩種典型工況下的機(jī)構(gòu)強(qiáng)度理論計(jì)算方法;對(duì)動(dòng)臂焊接結(jié)構(gòu)的強(qiáng)度進(jìn)行理論分析,得出焊縫的幾何形狀對(duì)焊接結(jié)構(gòu)的強(qiáng)度存在極大影響,為進(jìn)行強(qiáng)度有限元分析選擇更加合理的焊接結(jié)構(gòu)奠定了基礎(chǔ)。(2)通過(guò)SolidWorks軟件的參數(shù)化零件建模和虛擬裝配技術(shù),建立了2m3地下鏟運(yùn)機(jī)工作機(jī)構(gòu)的虛擬樣機(jī)。將其導(dǎo)入動(dòng)力學(xué)仿真軟件ADAMS中,選取兩個(gè)典型的載荷分布——正載和偏載,對(duì)正轉(zhuǎn)六連桿工作機(jī)構(gòu)進(jìn)行多剛體動(dòng)力學(xué)仿真,獲得了動(dòng)臂上的三個(gè)主要鉸接點(diǎn)的運(yùn)動(dòng)特性并得出最大受力的狀態(tài)處在鏟取位置,為更加合理地進(jìn)行強(qiáng)度分析提供了依據(jù)。(3)在ANSYS Workbench中建立處于鏟取工況下的工作機(jī)構(gòu)有限元模型,添加正載和偏載載荷并進(jìn)行靜力學(xué)分析,找出了工作機(jī)構(gòu)各構(gòu)件的應(yīng)力集中處和最大應(yīng)力值,分析危險(xiǎn)截面和高應(yīng)力區(qū)的分布情況。由仿真結(jié)果可知,在兩種不同的載荷情況下,動(dòng)臂和搖臂的總體應(yīng)力變化不大,且最大應(yīng)力值均小于選擇材料的許用應(yīng)力。在偏載載荷下,由于正轉(zhuǎn)六連桿機(jī)構(gòu)的特性,連桿所受拉應(yīng)力比正載載荷下明顯增大了一倍。同時(shí),鏟斗斗刃與動(dòng)臂側(cè)板與橫梁之間的焊接焊縫出現(xiàn)了應(yīng)力集中情況,為進(jìn)行焊接結(jié)構(gòu)的強(qiáng)度仿真提供了依據(jù)。(4)對(duì)具有不同焊接形式的側(cè)板與橫梁之間的焊縫的動(dòng)臂模型進(jìn)行有限元仿真與研究,得出各因素對(duì)焊縫強(qiáng)度的一般影響規(guī)律,提出了更加合理的抗疲勞性能的焊縫結(jié)構(gòu)形式。給出側(cè)板坡口角度為40°、角焊縫加強(qiáng)高尺寸不超過(guò)8mm、所形成的焊縫表面為內(nèi)凹形的焊接結(jié)構(gòu)更能滿足強(qiáng)度要求。
[Abstract]:Underground scraper is one of the main equipment necessary for underground mine trackless mining. It depends on the movement of working mechanism to complete the loading, transporting and unloading of materials. At present, the welding structure is adopted in the working mechanism, and the structure form and welding quality of the weld directly affect the strength of the working mechanism. In this paper, the working mechanism of 2m3 underground scraper is taken as an example. Based on the different welding forms and quality, the strength and dynamics of the forward rotating six-bar mechanism are studied and analyzed. In order to obtain the strength distribution and dynamic characteristics of the positive rotating six-bar mechanism. The main work of this paper is as follows: (1) the force condition of the forward rotating six-bar working mechanism under the conditions of insertion and shovel is studied, and the theoretical calculation method of the mechanism strength under two typical working conditions is obtained, and the strength of the welded structure of the arm is analyzed theoretically. It is concluded that the geometry of weld seam has a great influence on the strength of welded structure, which lays a foundation for selecting a more reasonable welding structure by means of finite element analysis of strength. (2) Parametric part modeling and virtual assembly technology based on SolidWorks software. The virtual prototype of working mechanism of 2m3 underground scraper is established. It is introduced into the dynamic simulation software ADAMS, and two typical load distributions, positive load and partial load, are selected to simulate the multi-rigid-body dynamics of the forward rotating six-bar mechanism. The motion characteristics of the three main hinge points on the arm are obtained and the state of the maximum force is in the shovel position. In order to make strength analysis more reasonable, the finite element model of working mechanism under the condition of shovel is established in ANSYS Workbench. The positive load and partial load are added and statics analysis is carried out. The stress concentration and the maximum stress value of each component of the working mechanism are found, and the distribution of the dangerous section and the high stress region is analyzed. The simulation results show that under two different loads, the total stress of the arm and rocker arm has little change, and the maximum stress value is smaller than the allowable stress of the selected material. Due to the characteristics of the positive rotating six-bar linkage, the tensile stress of the connecting rod is increased by twice as much as that under the positive load load. At the same time, the stress concentration appears in the welding weld between the bucket blade and the side plate of the moving arm and the beam. For the strength simulation of welding structure, the finite element simulation and research of the welding arm model between side plate and beam with different welding forms are carried out, and the general influence law of each factor on weld strength is obtained. A more reasonable weld structure with fatigue resistance is proposed. The groove angle of the side plate is 40 擄, the high size of the fillet weld is not more than 8 mm, and the welding structure with the inner concave surface is more suitable for the strength requirement.
【學(xué)位授予單位】：山東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD421

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