Anti-deflection device for output piston rod of hydraulic actuator of true triaxial testing machine

Abstract

The invention discloses an anti-deflection device for an output piston rod of a hydraulic actuator of a true triaxial testing machine. The anti-deflection device comprises an inner supporting sleeve, rollers, rolling friction supporting plates and an outer supporting flange, wherein the section of the inner surface of the inner supporting sleeve is circular, and the section of the outer surface is rounded rectangle-shaped; the section of the inner surface of the outer supporting flange is in a rounded rectangle shape, and the section of the outer surface is circular; the inner supporting sleeve fixedly sleeves the load sensor and is fixedly connected with the piston rod; one end of the load sensor is fixedly connected with the piston rod, the other end of the load sensor is fixedly connected with the pressure head,and the pressure head, the load sensor and the piston rod are coaxially distributed; two sets of rollers are mounted on the outer surface of the inner supporting sleeve and are symmetrically distributed at 180 degrees relative to the center of the inner supporting sleeve; two rolling friction supporting plates are installed on the inner surface of the outer supporting flange and symmetrically distributed by 180 degrees relative to the center of the outer supporting flange; the rollers and the rolling friction supporting plates are in one-to-one correspondence in position and are in rolling contact fit; and the outer supporting flange is fixedly connected to a counter-force frame of the true triaxial testing machine.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics tests, in particular to an anti-deflection device for an output piston rod of a hydraulic actuator of a true triaxial testing machine. Background technique [0002] True triaxial testing machines are mainly divided into two categories according to different loading methods, including two rigid and one flexible true triaxial testing machines and three rigid true triaxial testing machines. Taking the two rigid and one flexible true triaxial testing machine as an example, during the true triaxial loading test, the rigid loading surface of the rock sample is loaded through interlocking fixtures, and the flexible loading surface of the rock sample is loaded through hydraulic oil. , and in the process of loading the rigid loading surface of the rock sample, it will be affected by the rigid loading surface in the vertical direction to different degrees to produce lateral stress, which is then tran...

AI Technical Summary

Problems solved by technology

Taking the two rigid and one flexible true triaxial testing machine as an example, during the true triaxial loading test, the rigid loading surface of the rock sample is loaded through interlocking fixtures, and the flexible loading surface of the rock sample is loaded through hydraulic oil. , and in the process of loading the rigid loading surface of the rock sample, it will be affected by the rigid loading surface in the vertical direction to different degrees to produce lateral stress, which is then transmitted to the piston rod, and the piston rod acts on the lateral stress It will cause deflection, which will cause excessive friction between the piston rod and the cylinder, which will not only damage the sealing of the cylinder, but also reduce the life of the entire hydraulic actuator

In addition, under the influence of lateral stress, it will not be possible to apply a uniform load to the rock sample, which will eventually affect the accuracy of the test results

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