Piston rod pressure-holding and pushing device of pseudo-triaxial pressure-holding loading device

Abstract

The piston rod pressure maintaining and pushing device of the false three-axis pressure maintaining and loading device of the present invention includes a cylinder body and a push rod mechanism, and the left and right connected hollow chambers of the cylinder body include a left chamber, a sealed chamber and a right chamber, the left end of the cylinder block is sealed with a cylinder cover, the push rod mechanism includes a push rod drive device, a push rod and a push rod head assembly fixedly connected to the right end of the push rod, the right end of the push rod head assembly Buckled on the left end of the piston rod of the false three-axis pressure maintaining and loading device, the push rod is provided with an annular boss whose annular area is equal to the cross-sectional area of ​​the push rod, and the push rod protruding from the outside of the cylinder head The rod is connected to a push rod drive. The piston rod pressure maintaining and pushing device of the pseudo triaxial pressure maintaining and loading device of the present invention pushes the piston rod and the sealing device into the left cylinder of the pseudo triaxial pressure maintaining and loading device through the push rod mechanism sealed in the cylinder body, effectively ensuring The fidelity samples in the test cabin of the pseudo-triaxial pressure-holding loading device are always in a fidelity state.

Description

technical field [0001] The invention relates to a pushing device, in particular to a pushing device used for a pseudo triaxial pressure maintaining and loading device. Background technique [0002] Rock triaxial compression test is an important means to study rock mechanical behavior and determine rock mechanical performance index. The traditional triaxial testing machine is to place the sampled and cut rock sample in the confining pressure of the testing machine, wrap it with rubber sleeves, heat shrinkable tubes or silica gel, and then inject hydraulic oil to test different confining pressures. The rock sample measured under this condition basically has no pore pressure in the initial state, which is not consistent with the real rock state underground. Even if the pore pressure can be restored by osmotic pressure, the rock sample has undergone irreversible changes in the process of pore pressure change, which will have a great impact on its mechanical behavior. Fidelity ...

AI Technical Summary

Problems solved by technology

However, since the obtained fidelity cores are generally placed in tanks filled with pressure-preserving media, the mechanical experiment testing of fidelity cores still faces great difficulties. It is necessary to develop In order to complete the pseudo-triaxial pressure-holding loading device for testing fidelity rock core samples, it is also necessary to develop a device that can be used to push the piston rod to the pseudo-triaxial pressure-holding loading device in the pressure-holding state and realize its pressure-holding and sealing The push device to complete the installation of the pseudo-triaxial testing machine

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