Protection and positioning loading device for SHPB disc test piece

Abstract

The invention discloses a protection and positioning loading device for an SHPB (split Hopkinson pressure bar) disc test piece, which is characterized by comprising a base and a controller module, and a laser level meter for emitting laser rays is arranged in the middle of the lower end of the front end surface of a third hydraulic lifting device; the height of the third hydraulic lifting device pushing the supporting frame to rise is measured through the laser distance measuring sensor, so that the height of the center line of the disc test piece is judged, and the function of automatically adjusting the center line of the disc test piece to be aligned with the center line of the incident rod is achieved; the distance between a disc test piece and a distance pushing block is detected through a first laser distance measuring sensor, so that a fourth hydraulic lifting device is controlled to work through a controller module, the pushing block is pushed to move, and the effect that the center line of the disc test piece in the vertical direction is aligned with the center line of a supporting frame is achieved; and the rays emitted by the laser gradienter are used for comparison and judgment, so that the working efficiency is improved, the alignment error is reduced, the protection effect is achieved, and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of SHPB disk test piece equipment, in particular to a protection and positioning loading device for SHPB disk test pieces. Background technique [0002] With the development of underground mining, blasting construction, and explosion-proof and earthquake-proof engineering, the research on the dynamic failure characteristics of rock mass has attracted more and more attention. SHPB is used to measure the rock dynamic failure mechanical parameters. At present, the SHPB test has been widely used in the dynamic performance parameters of rock materials. Research. However, there are many problems in the SHPB comparative test of disc specimens with different sizes, which lead to experimental errors. In the SHPB impact compression test, the friction between the compression rod and the specimen is usually used to clamp the specimen between the incident rod and the transmission rod, or use viscous materials such as bu...

AI Technical Summary

Problems solved by technology

However, in the dynamic splitting test using disc specimens, the contact surface between the specimen and the compression rod is very small, and it is difficult to achieve the loading where the central axis of the compression rod coincides with the loading diameter direction of the disc.

[0003] In the existing disc specimens used for SHPB, the position of the support frame is manually adjusted for the disc specimens of different sizes during use, so as to achieve the coincidence and alignment of the specimen and the axis of the pressure bar during the test, thus affecting the alignment accuracy Large errors are generated, and at the same time, deviations are prone to occur during the alignment of the disc specimens on the support frame, thereby affecting the test results, and when the specimens are damaged, the fragments burst violently, and the test operator is at risk of injury. High-speed cameras are used to monitor the test piece destruction process and equipment is also vulnerable to damage

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