Effects of constraint boundaries and simplified pin joints on strength of hydraulic support

Abstract:

To accurately analyze the strength characteristics of hydraulic support considering the canopy torsional loading condition, by taking ZY6800/08/18D hydraulic support as the research object, the three-dimensional solid finite element model is established. According to the results of hydraulic support test, selecting the location of measuring points on the simulation model, the stress distributions of the hydraulic support are compared under eight boundary conditions for the canopy and base. In addition, the contact stress and status are analyzed under the frictional contact boundary condition between the base and worktable. It is pointed out that the phenomenon of incomplete contact of the base is caused by the load asymmetry during the canopy torsional loading. The influence of four simplified methods for pin joint on the stress distribution is also analyzed under the constant constraint boundary condition. Finally, the stress distribution obtained from the experiment evaluates the accuracy and efficiency of various boundary and pin joint simplification methods. When the canopy boundary selects fixed support, the base boundary selects friction contact with the working table, and retaining the pin joint and bonding the pin joint to the axle hole, the simulation results are the closest to the test results, and the simulation has high-efficiency. The research results can provide the basis and reference for the accurate estimation of the hydraulic support stress distribution.