冲击载荷下液压支架双伸缩立柱的受力及仿真分析

发布时间：2018-04-26 13:46

本文选题：液压支架 + 双伸缩立柱　；参考：《太原理工大学》2015年硕士论文

【摘要】：液压支架是综采设备中的关键组成部分，它关乎到整个采煤过程是否能够安全顺利的进行，液压支架立柱在液压支架当中承担着承载重量与调整高度的角色，但是在多种载荷的作用下，液压支架立柱处于高压状态，而且中缸有时会出现鼓胀现象，造成立柱的损坏。传统计算液压支架和立柱受力及强度的过程不仅与实际生产过程中有一定的差距，而且没有考虑冲击载荷下的液压支架立柱的受力与变形情况。首先根据实际受力情况，建立了液压支架空间力系模型，经过分析计算得到了作用在液压支架立柱上的力，通过计算得到中缸受到的压强最大，之后分别对活柱、中缸、外缸进行了强度校核。然后运用AMESim软件建立液压双伸缩立柱的液压系统图，将中缸受到的最大压强作为系统的工作压力，对立柱液压回路卸载冲击过程进行了仿真分析，得到了液压缸支架立柱的压力曲线。通过分析得到阀芯阻尼的适当增加可以提前减小阀芯的激荡，从而使液压系统快速地处于稳定。接着以冲击载荷时液压支架立柱的受力的动态过程作为研究对象，建立数学模型，运用数学知识，及边界约束条件，求得冲击载荷下液压支架立柱的压力曲线函数表达式。代入具体的参数后，运用Matlab分析函数的极值点，得到大约在0.025s时中缸的压强达到最大值330MPa。最后在Pro/E中建立双伸缩立柱的建模，简化后导入到Marc有限元软件中，，将最大压力330MPa施加到整个液压支架立柱中,得到了整体液压支架立柱的整体位移变化图，然后重点分析了中缸的应力图和变形量，得出中缸残余变形量为0.365%，超出规定值，故得对中缸进行加强处理。
[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.

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD355.4

【参考文献】