液压支架矿用液压缸动载过载特性的仿真及试验研究

Simulation and Experimental Study on Dynamic Load Characteristics of Hydraulic Cylinders for Hydraulic Supports

基于AMESim和ANSYS workbench仿真分析,分别搭建了动载过载条件下液压支架矿用液压缸动载加载模型与结构件瞬态动力学仿真模型,得到了液压缸在动载过载条件下的内腔压力特性曲线以及缸体、活塞杆应力应变分布情况。进行动载过载测试试验,得到了动载过载加载条件下液压缸下腔压力-时间曲线以及缸体、活塞杆外表面测点应变测试数据。结果表明:仿真计算结果与试验测试数据在一定误差范围内基本吻合,验证了2种仿真模型以及边界条件设定的合理性以及准确性;液压缸在动载过载条件下,无杆腔压力在30 ms内由初撑压力15 MPa升高到1.0~1.5倍额定压力,对应缸筒预期破坏位置为液柱中上方约1/6处对应缸筒部分:外表面最大应力值为267 MPa,内表面应力值约为363 MPa,且在材料屈服极限内,不同压力倍率下液压缸结构件应力应变分布规律保持一致。

Based on the simulation analysis of AMESim and ANSYS workbench,the dynamic loading model of hydraulic cylinder for hydraulic support under dynamic load overload condition and the transient dynamic simulation model of structural member are built respectively.The internal cavity pressure of hydraulic cylinder under dynamic load overload condition is obtained.Characteristic curve and stress and strain distribution of cylinder and piston rod.The dynamic load overload test was carried out,and the pressure-time curve of the lower cylinder of the hydraulic cylinder under the dynamic load overload condition and the strain test data of the outer surface of the cylinder and piston rod were obtained.The results show that the simulation results are basically consistent with the experimental test data within a certain error range,which verifies the rationality and accuracy of the two simulation models and the boundary condition setting;Under the condition of dynamic load overload of the hydraulic cylinder,the pressure of the rodless chamber is increased from 15 MPa to 1.0~1.5 times of the rated pressure within 30 ms,and the expected failure position of the corresponding cylinder is about 1/6 of the corresponding cylinder in the upper part of the liquid column.Part:the maximum stress value of the outer surface is 267 MPa,and the internal surface stress value is about 363 MPa;And within the yield limit of the material,the stress and strain distribution of the structural members of the column are consistent under different pressure ratios.