A spherical pressure head and double-layer roller-type compression force transmission mechanism

Abstract

A spherical pressure head and double-layer rolling-type compression force transmission mechanism, including a ball-head pressure-bearing part, a ball-and-socket pressure-bearing part, a vertical roller, a pressure-bearing partition, a horizontal roller, a pressure-bearing base, and a pressure-bearing The force transmission parts are arranged sequentially. The ball head pressure bearing part and the pressure bearing base are connected by a tension fixed spring. together; the pressure base is fixed with symmetrically distributed upper brake shoes and lower brake shoes. The movement in the horizontal and vertical directions is used for braking; the flat end of the ball head pressure-bearing part protrudes from the upper and lower brake shoes and is in contact with the interlocking loading pressure plate. The ball head pressure-bearing part, the ball-and-socket pressure Centering springs are installed along the circumference between the row, transverse rolling row, pressure-bearing partition and upper and lower brake shoes to offset the influence of self-weight and keep the ball head pressure-bearing parts in a reset and centered state before loading.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics tests, and in particular relates to a spherical indenter and a double-layer rolling-type compression force transmission mechanism. Background technique [0002] At present, in the true triaxial rock compression test, in order to eliminate the stress blank angle effect, the interlocking loading plate is usually used to wrap the rock sample. However, this method will generate a large tangential sliding friction force, thereby reducing the The load acting directly on the rock sample leads to the lack of accuracy of the test data. [0003] In addition, due to the natural heterogeneity of the rock sample, if the processing accuracy of the rock sample is limited, it will also cause non-uniform and non-parallel deformation on the surface of the rock sample during the loading process, resulting in insufficient stress on the surface of the rock sample. uniform, which in turn will affect the failure...

AI Technical Summary

Problems solved by technology

[0002] At present, in the true triaxial rock compression test, in order to eliminate the stress blank angle effect, the interlocking loading plate is usually used to wrap the rock sample. However, this method will generate a large tangential sliding friction force, thereby reducing the Loads acting directly on the rock sample, resulting in inaccurate test data

[0003] In addition, due to the natural heterogeneity of the rock sample, if the processing accuracy of the rock sample is limited, it will also cause non-uniform and non-parallel deformation on the surface of the rock sample during the loading process, resulting in insufficient stress on the surface of the rock sample. uniform, which will affect the failure characteristics of rock samples

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