本文選題：井下 + 液壓式　； 參考：《安徽理工大學(xué)》2015年碩士論文

【摘要】：煤炭開采伴隨著大量矸石的產(chǎn)生,造成地面大量矸石山的堆積,為實(shí)現(xiàn)綠色開采目標(biāo),對井下開采出來的矸石直接分選,分選出的矸石直接用于采空區(qū)的充填,這樣既可以減少礦區(qū)的環(huán)境污染也可以有效控制采空區(qū)塌陷帶來的危害。根據(jù)煤和矸石的硬度特性的差異,提出一種新的井下液壓式選擇性煤矸分離裝備。為此,本文結(jié)合了理論研究、實(shí)驗(yàn)數(shù)據(jù)和仿真模擬方法,對井下液壓式選擇性煤矸分選裝備的關(guān)鍵技術(shù)進(jìn)行研究。 基于井下液壓式選擇性煤矸分離裝備結(jié)構(gòu)和擠壓破碎過程特點(diǎn),在現(xiàn)有的破碎強(qiáng)度理論和破碎能耗理論基礎(chǔ)上,建立了點(diǎn)載荷破碎力學(xué)模型,并建立了在拉應(yīng)力下和剪應(yīng)力作用下,煤矸發(fā)生破壞的破碎準(zhǔn)則；建立了單顆粒煤巖擠壓破碎的屈曲分析有限元模型,對實(shí)驗(yàn)數(shù)據(jù)和理論仿真結(jié)果處理,擬合得到物料的抗壓強(qiáng)度和屈曲強(qiáng)度之間的關(guān)系。 基于評價(jià)煤矸破碎分選效果的兩個(gè)指標(biāo)一丟煤率和混矸率,給出了三種臨界破碎載荷下的最大丟煤率和最大混矸率的計(jì)算公式,建立了煤矸選擇性破碎分選準(zhǔn)則；設(shè)計(jì)了井下液壓式選擇性分選裝備,介紹了裝備破碎分選原理和破碎分選液壓回路工作原理；對物料擠壓過程時(shí)裝備的關(guān)鍵部件進(jìn)行了力學(xué)分析,推導(dǎo)出了液壓缸設(shè)置的壓力值與煤矸顆粒的破碎載荷的關(guān)系式,對分離裝備的偏心凸輪的運(yùn)動(dòng)學(xué)分析,給出了物料的擠壓受力特性,通過對偏心凸輪上擠壓點(diǎn)的位移、速率、加速度分析,研究了偏心凸輪運(yùn)動(dòng)特性。 通過ANSYS Workbench接觸仿真分析,探究了一定范圍下的壓板傾角對煤或矸石破碎效果的影響,研究表明：壓板傾角在15。時(shí),煤和矸石的選擇性破碎效果最好；為尋找特定設(shè)備的處理粒度范圍,探究了一定范圍的入料粒度對破碎效果的影響,對物料破碎前的分級處理具有一定指導(dǎo)意義。
[Abstract]:Coal mining is accompanied by the accumulation of a large amount of coal gangue , which causes the accumulation of a large amount of waste rock in the ground . In order to achieve the goal of green mining , the coal gangue which is mined out is directly used for the filling of mined areas , so that the new underground hydraulic selective coal and gangue separation equipment can be effectively controlled according to the difference between the hardness characteristics of the coal and the gangue , and the key technology of the underground hydraulic selective coal and gangue separation equipment is studied according to the difference between the hardness characteristics of the coal and the gangue .

On the basis of the existing theory of crushing strength and energy consumption theory , a point load crushing mechanical model is established based on the characteristics of the structure and crushing process characteristics of the underground hydraulic selective coal refuse separation equipment structure and the crushing energy consumption theory , and the breaking criterion of the damage of the coal gangue under the action of tensile stress and shear stress is established ;
A finite element model for buckling analysis of single - particle coal - rock extrusion crushing is established , and the relationship between compressive strength and buckling strength of the material is obtained by processing experimental data and theoretical simulation results .

Based on the evaluation of two indexes of coal and gangue crushing and sorting effect , a formula for calculating the maximum coal loss rate and the maximum coal blending ratio in three critical crushing loads is given , and the criterion of selective crushing and separation of coal and gangue is established .
The principle of equipment crushing and sorting and the working principle of crushing and sorting hydraulic circuit are introduced in this paper .
Based on the mechanical analysis of the key parts of the equipment during the extrusion process of the material , the relation between the pressure value set by the hydraulic cylinder and the crushing load of the coal gangue particles is derived . The kinematics analysis of the eccentric cam of the separation equipment is derived . The displacement , rate and acceleration of the extrusion point on the eccentric cam are analyzed , and the eccentric cam motion characteristics are studied .

Through the analysis of ANSYS Workbench contact simulation , the influence of pressure plate inclination angle on the crushing effect of coal or gangue has been studied . The results show that the selective crushing effect of coal and gangue is the best when the inclination of the pressing plate is 15 .
In order to find the processing granularity range of the specific equipment , the influence of the particle size on the crushing effect is explored , which has some guiding significance to the grading treatment before the material crushing .
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD849.5

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本文編號：2005293