Adjusting and positioning device for low-temperature tank test piece

Abstract

An adjusting and positioning device for a low-temperature tank test piece is arranged in a low-temperature tank body of a low-temperature tank. The adjusting and positioning device is composed of a limiting buckling failure ejector chunk arranged in the middle portion of the inner bottom face of the low-temperature tank body, two wane chunks arranged at the middle positions of the left end and the right end of the inner bottom face of the low-temperature tank body, and two adjusting wane pressing rod chunks arranged at the middle positions on the top faces of the left side wall and the right side wall of the low-temperature tank body. The limiting buckling failure ejector chunk is composed of a buckling failure ejector and two limiting separation blades. Each wane chunk is composed of a wane support, a wane and a limiting screw. Each adjusting wane pressing rod chunk is composed of a top frame, a wane pressing rod, a lateral adjusting plate, a lateral adjusting rotating shaft and an eccentric circular block. Thus, during the low-temperature CTOD test, the adjusting and positioning device can replace human hands to operate in a low-temperature solution, mechanical adjusting and positioning of the test piece are achieved, and the test piece placing position accuracy is improved; and accordingly the test precision and efficiency are improved, and the safety risk that people are bruised and frosted in the test process is lowered.

Description

technical field [0001] The invention relates to the technical field of devices for testing mechanical properties of steel materials and welded joints, in particular to a low-temperature tank specimen adjustment and positioning device used for low-temperature fracture performance evaluation tests of steel materials and welded joints. Background technique [0002] CrackTip Opening Displacement (CTOD) crack tip opening displacement test is an effective method to evaluate the fracture resistance of materials and welded joints, and it is a standard test method in many standards at home and abroad. In the CTOD test, it is a key step in the test to use a universal testing machine to perform three-point bending on the prefabricated fatigue cracked specimen to make the prefabricated crack expand and realize the instability and failure of the specimen. The accuracy of aligning the three-point bending head directly affects the accuracy and validity of the test. [0003] During the low...

AI Technical Summary

Problems solved by technology

From the point of view of the entire operation process of the specimen instability and failure steps, under the current working mode and test conditions, since the test personnel have to manually place, observe, adjust and support the specimen in the low-temperature solution, there is a problem with the accuracy of the placement position of the specimen. It is not easy to guarantee, which reduces the test accuracy, and there are safety hazards such as crushing and frostbite during the test process, and low work efficiency.

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