Pipe rod screw fault detection sensor

Abstract

The invention discloses a sensor for detecting the defects of the pipe bolt thread. The left end of the bolt's inner bushing is equipped with a magnetic coil. The middle section of it is covered by a proe bracket which can slide along the outside surface. The probe is fitted on the probe bracket by floating fitting and is distributed evenly and symmetrically along the circular direction. There is a probe guide groove in the middle of the inner bushing, allowing each probe to extend into the corresponding guide groove and can slide in its it by the driving of the probe bracket. the probe is equipped with magnetic induction element. The end of the inner bushing is equipped with a magnetic induction extension bushing. the flange guide groove is open in the middle of it and is in the induction extension bushing. Its arms are connected with the probe bracket with a extension arm. A linear electrical engine is connected with the axis of flange. By the detecting sensor, a variety of defects of the pipe bolt thread can be detected with a high accuracy and efficiency, so as to resolve a manufacture technical problem that exists all along in the oilfield and have a broad prospect.

Description

technical field [0001] The invention belongs to a digital magnetic non-destructive testing instrument, and is especially suitable for detecting defects of oil pipes (rods) and drill pipe thread parts used in oil fields. technical background [0002] Oil pipes (rods) and drill pipes are important components in the process of oil production and drilling in oil fields, and they are used in a large amount. The threaded parts of these pipes and rods are the same as the rod body, and different types of defects will occur due to various reasons during long-term use. The main causes of various defects in the oil pipe thread are: insufficient pre-tightening force, material defects or heat treatment quality that does not meet the requirements, poor thread processing quality, large perpendicularity error between the shoulder end face and the external thread center line, and the shoulder side and joint. Lack of contact with hoop end face, corrosion, swabbing load overload, long-term alt...

AI Technical Summary

Problems solved by technology

[0003] In short, due to the particularity of the structure of pipe and rod threads used in oil fields, there are many intersecting curves on the surface, the surface of the thread itself is not smooth, and the detection area is small. So far, there is no effective and reliable detection method. , One of the problems that have not been overcome in the drilling process

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