Drilling tool internal thread rotary detection device based on magnetic memory effect

Abstract

The invention discloses a drilling tool internal thread rotary detection device based on the magnetic memory effect. The drilling tool internal thread rotary detection device based on the magnetic memory effect comprises a centering structure assembly and a rotary detection assembly, wherein the centering structure assembly can enable the axis of the rotary detection assembly to be coincide with the axis of a threaded hole of a detected drilling tool joint, thereby enabling a magnetic memory sensor in the rotary detection assembly to keep a constant lift-off value in rotation measurement when abutting against the detected internal thread surface. Therefore, the drilling tool internal thread rotary detection device based on the magnetic memory effect has the characteristics of high detection precision, simple and convenient operation and the like.

Description

technical field [0001] The invention relates to a non-destructive detection device, in particular to a rotary detection device for the internal thread of a drilling tool based on magnetic memory effect for detecting the stress concentration and damage of the internal thread of an oil drilling tool. Background technique [0002] At present, one of the main manifestations of drilling tool failure in the field of oil exploitation is fracture and damage at the connecting thread part. For the internal thread of the drill tool joint, the fracture crack often occurs at the threaded buckle of the last meshing part. The internal thread of the joint is the weak link most likely to be damaged due to its geometric structure and the stress concentration effect at the root of the thread, which makes it easy to initiate fatigue cracks under the action of compound alternating stress, and under the action of cyclic stress and corrosive medium. Expand until it breaks. In recent years, the pr...

AI Technical Summary

Problems solved by technology

[0005] Magnetic memory testing technology, as the only effective non-destructive testing technology that can simultaneously detect stress concentration areas and damage in their tissues, and various macroscopic defects, has attracted great attention at home and abroad, especially in petrochemical pipelines and power stations. , rail transit equipment and other fields have been widely used, and have achieved remarkable economic and social benefits, but the application of magnetic memory detection technology to the detection of internal thread stress and damage status of drilling tools is still in a blank stage

Images