Analysis On Impact Strength Big Bore Double Telescopic

Hydraulic column is the main bearing hydraulic components, its strength and reliability under high pressure on the coal mining plays a vital role in safety.Fully mechanized coal face Needs use high resistance of the hydraulic support, promote the process of extraction accompanied by a strong impact load, which is the structure of hydraulic components and hydraulic strength column caused a great security threat. Based on this condition, this difference in static load and dynamic load conditions, the impact on the hydraulic analysis of the strength column.To ZY12000/28/63 type hydraulic support for the physical model, based on support columns for the main technical parameters of the static strength analysis, including the cylinder under static load strength of column components analysis and stability analysis. Through traditional mechanical calculation compared with the ANSYS finite element analysis derived the greatest part of the force column appears in the central cylinder, the strength of the weakest central cylinder; in the cylinder with the empirical formula of the stress error is too large, the error is due to empirical formula in calculating the stress caused by inaccurate. Impact load on the role of hydraulic column approach is based on objects falling, and construct a quality work force and resistance of the same object column, the height of free fall in a certain role of stigma in the column of living, as the impact of dynamic load model.Coupled with the machine calculation of liquid, respectively cylinder cavity pressure fluctuation time series analysis, and as a cylinder block of the dynamic load boundary conditions, using LS-DYNA explicit finite element software, finite element analysis method obtained a column under impact loading cylinder in the stress and strain time series values. Analysis obtained: live at the bottom of cylinder units partly because of the superposition of stress waves generated stress concentration, it is possible to make the bottom of the structure deformation, and thus make contact with the local deformation arising in the cylinder; as the impact of increased internal pressure caused by the work of media moment, the pressure of column top and bottom are a rapid oscillation, the damping as well as the working medium pressure wave propagation time delay of more intense and thus the top than the bottom.Carried out with AMESim hydraulic systems and components of the fluid characteristics of simulation and finite element method in solid parts of the LS-DYNA modeling solution, both achieved through the exchange of data, the solid-liquid coupling fluid mechanical joint simulation analysis. Through this method, try and get the hydraulic cylinder in the dynamic loading of more realistic conditions of the simulation calculation.Through the column model static and dynamic strength calculation, comparative analysis of the column calculated correction factor of safety of various parts of the dynamic factor, as a column designed to provide reasonable security theory.