Characteristic Analysis Of Static Pressure Sliding Table And Oil Cavity Of High Pressure Super Large Plane Multi-Pressure Unit

The flexible rubber mount used by the bridge pier and the house building pillar has been applied in engineering for decades,especially in recent years,with the significant increase in the tonnage of the bridge building,the demand for the detection range of the mount has also been greatly increased,and there is little pressure shear test machine that can achieve 30-60 mn loading force.This article relies on Henan Province transportation technology project,the bottom pressure part of the equipment for the design and performance analysis.The technical support principle of static pressure is in line with the large-scale pressure load and the pressure.Therefore,the technical principle of reference static pressure guide is popularized to the arrangement support of the entire under-pressure plate bottom.For the performance analysis of oil chamber and sliding table in compression-shear test,starting with the structural optimization of oil chamber,the influence of different influencing factors on bearing capacity and pressure distribution is analyzed.(1)Design the structure of hydrostatic oil chamber,including optimizing the lengthwidth ratio of oil chamber according to working conditions.(2)Lightweight design of the lower platen should minimize the pressure of extra accessories other than the workpiece on the hydrostatic oil chamber.After comparing various internal topological grid structures with ANSYS Workbench static simulation module,the hexagonal honeycomb design can effectively relieve stress concentration and reduce the load of oil cavity in the central area.(3)By simulating the flow field of oil model obtained by Boolean operation,the influence of different oil cavity depth and oil return groove width on bearing capacity and the improvement scheme are obtained.According to the comparative analysis of post-processing pressure field,temperature field and velocity vector nephogram,the depth of oil cavity slightly affects the pressure bearing performance,and the smaller the depth,the better the pressure bearing capacity of oil film on the bottom surface;The width of oil return grooves has no obvious influence on the supporting force,but wider oil return grooves can bring better temperature control,and the gap thickness between oil return grooves should be reasonably increased to prevent local dry friction.(4)Finally,the problem of excessive flow is alleviated by sealing and pressure maintaining measures,and the gap seal and sealing belt structure are introduced.In the design of the whole set of pressure-bearing devices,the innovations mainly include providing a complete simulation comparison and selection scheme for the arrangement of super-large plane hydrostatic support in the future,deducing the formula for determining the optimal oil cavity unit size under different working conditions,dividing the bottom pressure-bearing area into arrays,constructing oil cavity array models with different oil cavity sizes and layouts,and comparing the static bearing performance.The results show that the 5×10 array has the best effect.The edge of the oil cavity organically combines various sealing structures to realize the triple functions of pressure maintaining,throttling and sealing.