Analysis of Weak Magnetic Detection Principle of Wire Rope Nondestructive Detector

Release time:

2021-09-17

The wire rope nondestructive testing instrument is mainly used in the daily nondestructive testing of the wire rope of the mine hoist, which can detect the diameter of the wire rope 6-64mm.

Analysis of Weak Magnetic Detection Principle of Wire Rope Nondestructive Detector

　　Wire rope nondestructive detectorIt is mainly used in the daily nondestructive testing of mine hoist wire rope, which can detect the diameter of wire rope 6-64mm.

Wire rope nondestructive testing instrument using permanent magnet, magnetic flux leakage (weak magnetic) detection principle through the wire rope magnetizing and demagnetizing change monitoring can accurately analyze the wire rope internal damage and external damage. It is the first choice for steel wire rope detection in mining, port and cableway industry. So what is the principle of its detection? The following is a detailed introduction by the small series of 100 ketot!

Weak magnetic detection technology is based on "spatial magnetic field vector synthesis", using a wide-distance, non-contact weak magnetic energy potential sensing device, by extracting the weak magnetic energy potential distribution difference information on the ferromagnetic material that has been applied with magnetic load, to complete the positioning, qualitative and quantitative identification of various defects inside and outside the wire rope electromagnetic non-destructive testing technology.

Following the principle of checking the safe bearing capacity of steel wire ropes specified in international standards (ISO3154 1988), the extracted physical field change information of ferromagnetic materials, the single-value equivalent mapping of the comprehensive degeneration characteristics of ferromagnetic material volume elements on steel wire ropes, and the non-destructive testing instrument of steel wire ropes provide scientific and technical basis for systematically evaluating the comprehensive tensile/bending/torsional bearing performance, safe service life and safe load factor of steel wires.

Note: Magnetic energy potential, that is, the magnetic field energy gradient; volume element, that is, the volume differential of the wire rope along the axial direction. The comprehensive degeneration characteristics of the load material in the volume element are the comprehensive reflection of the loss of metal cross-sectional area (LMA) and local defects (LF) of the wire rope.

The weak magnetic detection method introduces a modulated given weak electromagnetic field, which forms a physical field association with the weak magnetic field of the wire rope planned by the weak magnetic field. The sensor has outstanding technical characteristics such as no base noise operation in weak magnetic state, self-suppressing wide-distance sensing of lift-off effect, high sensitivity/high resolution/high rate airspace response, etc. Through long-term repeated experimental comparison and mathematical modeling, the technical problem of the quantitative relationship between the physical field variables of the wire rope load material and the changes related to its mechanical load performance is solved.

To sum up,Wire rope nondestructive flaw detectorThe process flow of weak magnetic detection is: weak magnetic planning (P)-instrument calibration (D)-weak magnetic detection (T)-data processing (M).