Magnetic flux leakage defection machine of oil sleeve

Abstract

The invention discloses a magnetic flux leakage defection machine of an oil sleeve. The magnetic flux leakage defection machine comprises a control cabinet, a computer, a production line detection system and a marking machine, wherein the control cabinet is respectively connected with the computer, the production line detection system and the marking machine through a signal line; and the production line detection system comprises a plurality of clamping driving devices, a vertical defect detection device and a transverse defect detection device. Electric signals of sleeve defects, detected by an infrared monitoring sensor on the production line detection system, are processed by a signal amplification circuit and a noise cancelling circuit and are divided into two paths; in one path, defect parts are accurately sprayed with marks by a signal processing circuit through utilizing the computer to drive the marking machine; and in the other path, defect signals are mixed into a simulated signal, and defect degree is displayed on a display screen of the computer through an A / D (Analog / Digital) converting circuit. With the adoption of the technical scheme of the invention, the magnetic flux leakage defection machine disclosed by the invention can carry out defect detection on the oil sleeve in rotation process on a production line, has small power consumption amount, is energy-saving and environment-friendly and has high detection sensitivity; and a probe does not need to be replaced when sleeves with different calibers are detected, the detection efficiency is high, the hooping of the oil sleeve can be smoothly avoided, the probe can be automatically reset after being detected, the service life is long, the cost is reduced, and the detection quality and the detection effect are improved.

Description

technical field [0001] The invention relates to a device for flaw detection of ferromagnetic pipes or rods using the principle of direct current magnetic flux leakage detection, in particular to a device for direct current nondestructive detection of oil casing leakage on long steel pipes with hoops and serious oil pollution on the assembly line. Magnetic flaw detector. Background technique [0002] During the sales and installation process of oil casings on the market, there are cracks, corrosion pits, inclusions, folds, pitting and other defects on the inner and outer walls of many pipes, which cannot be identified and detected by naked eyes alone, which requires instruments for detection and flaw detection . At present, when the magnetic flux leakage flaw detectors that detect oil casings on the market detect defects on oil casings on the inspection line, the entire machine has a complex structure, difficult maintenance, poor sensitivity, high cost, large power consumpti...

AI Technical Summary

Problems solved by technology

[0002] During the sales and installation process of oil casings on the market, there are cracks, corrosion pits, inclusions, folds, pitting and other defects on the inner and outer walls of many pipes, which cannot be identified and detected by naked eyes alone, which requires instruments for detection and flaw detection

At present, when the magnetic flux leakage flaw detectors that detect oil casings on the market detect defects on oil casings on the inspection line, the entire machine has a complex structure, difficult maintenance, poor sensitivity, high cost, large power consumption, and is not environmentally friendly. , different probes need to be replaced when testing oil casings with different pipe diameters. In this way, probes with different specifications must be prepared during testing, which is very inconvenient to replace and low detection efficiency; in addition, because there are The existence of section hoops is easy to damage the probe during detection, causing the life of the whole machine to not meet the requirements, increasing the cost, and seriously affecting the quality and effect of detection

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