本文選題：液壓支架 + 雙伸縮立柱��； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：液壓支架是綜采設(shè)備中的關(guān)鍵組成部分，它關(guān)乎到整個(gè)采煤過程是否能夠安全順利的進(jìn)行，液壓支架立柱在液壓支架當(dāng)中承擔(dān)著承載重量與調(diào)整高度的角色，但是在多種載荷的作用下，液壓支架立柱處于高壓狀態(tài)，而且中缸有時(shí)會(huì)出現(xiàn)鼓脹現(xiàn)象，造成立柱的損壞。傳統(tǒng)計(jì)算液壓支架和立柱受力及強(qiáng)度的過程不僅與實(shí)際生產(chǎn)過程中有一定的差距，而且沒有考慮沖擊載荷下的液壓支架立柱的受力與變形情況。 首先根據(jù)實(shí)際受力情況，建立了液壓支架空間力系模型，經(jīng)過分析計(jì)算得到了作用在液壓支架立柱上的力，通過計(jì)算得到中缸受到的壓強(qiáng)最大，之后分別對(duì)活柱、中缸、外缸進(jìn)行了強(qiáng)度校核。 然后運(yùn)用AMESim軟件建立液壓雙伸縮立柱的液壓系統(tǒng)圖，將中缸受到的最大壓強(qiáng)作為系統(tǒng)的工作壓力，對(duì)立柱液壓回路卸載沖擊過程進(jìn)行了仿真分析，得到了液壓缸支架立柱的壓力曲線。通過分析得到閥芯阻尼的適當(dāng)增加可以提前減小閥芯的激蕩，從而使液壓系統(tǒng)快速地處于穩(wěn)定。 接著以沖擊載荷時(shí)液壓支架立柱的受力的動(dòng)態(tài)過程作為研究對(duì)象，建立數(shù)學(xué)模型，運(yùn)用數(shù)學(xué)知識(shí)，及邊界約束條件，求得沖擊載荷下液壓支架立柱的壓力曲線函數(shù)表達(dá)式。代入具體的參數(shù)后，運(yùn)用Matlab分析函數(shù)的極值點(diǎn)，得到大約在0.025s時(shí)中缸的壓強(qiáng)達(dá)到最大值330MPa。 最后在Pro/E中建立雙伸縮立柱的建模，簡化后導(dǎo)入到Marc有限元軟件中，，將最大壓力330MPa施加到整個(gè)液壓支架立柱中,得到了整體液壓支架立柱的整體位移變化圖，然后重點(diǎn)分析了中缸的應(yīng)力圖和變形量，得出中缸殘余變形量為0.365%，超出規(guī)定值，故得對(duì)中缸進(jìn)行加強(qiáng)處理。
[Abstract]:The hydraulic support is the key part of the fully mechanized mining equipment. It is related to the safe and smooth operation of the whole coal mining process. The hydraulic support column bears the role of carrying weight and adjusting the height in the hydraulic support. But under the action of many loads, the column of the hydraulic support is in high pressure and the middle cylinder sometimes appears. The phenomenon of bulging causes the damage of the column. The traditional calculation of the force and strength of the hydraulic support and column not only has a certain gap in the actual production process, but also does not take into account the force and deformation of the column of the hydraulic support under the impact load.
Firstly, according to the actual force condition, the model of the space force system of the hydraulic support is set up. After the analysis and calculation, the force on the column of the hydraulic support is obtained and the maximum pressure of the middle cylinder is obtained by calculation. After that, the strength of the living column, the middle cylinder and the outer cylinder are checked respectively.
Then the hydraulic system diagram of the hydraulic double telescopic column is established by using the AMESim software. The maximum pressure of the medium cylinder is taken as the working pressure of the system, and the unloading impact process of the column hydraulic loop is simulated and analyzed. The pressure curve of the column of the hydraulic cylinder is obtained. The appropriate increase of the valve core damping can be reduced in advance by the analysis. The valve core is surged, so that the hydraulic system is stabilized at a rapid speed.
Then the dynamic process of the force of the hydraulic support column is taken as the research object, the mathematical model is set up, the expression of the pressure curve function of the column of the hydraulic support under the impact load is obtained by using the mathematical knowledge and the boundary constraint conditions. After the specific parameters are replaced, the extreme points of the Matlab analysis function are used to get about 0.025s The pressure of the medium cylinder reaches the maximum value of 330MPa.
In the end, the model of double telescopic column is established in Pro/E, and then introduced into the Marc finite element software, the maximum pressure 330MPa is applied to the whole hydraulic support column, and the whole displacement change diagram of the whole hydraulic support column is obtained. Then the stress and deformation of the middle cylinder are analyzed, and the residual deformation of the middle cylinder is 0.365%. According to the prescribed value, the medium cylinder must be strengthened.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD355.4

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