Wire rope load performance undamaged evaluating method

Abstract

The invention discloses a wire rope loading performance nondestructive evaluation method which comprises the following steps of: utilizing the physical properties of wire rope component loading material and relatively low magnetic field intensity H to lead a wire rope component to have continuous and even small magnetic energy product; and identifying and extracting physical field change information of the loading material equivalently relevant to the mechanical property degradation single values such as bending, twisting and pulling resistance, and the like of the wire rope component by applying magnetic energy potential difference information analysis equipment in real time. The wire rope loading performance nondestructive evaluation technology realizes the tentative plan of comprehensive monitoring and real-time evaluation from the manufacturing completion of the wire rope component to the end of the security use value thereof, and provides an effective and feasible technical measure and a safety management technique mode for preventing man-made disasters and saving material resources, thus having very positive social benefit and extremely practical economic benefit.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a non-destructive evaluation method for the load performance of a steel wire rope. Background technique [0002] Wire rope is a ferromagnetic metal component serving a special form of use. With the progress and development of human society, steel wire ropes are more widely used and endowed with more important missions. Therefore, the product quality and application reliability of steel wire ropes are highly concerned by the whole world, especially the major industrial countries. For more than a century, the application research of steel wire rope in various countries has been devoted to two aspects: 1. To improve product structure design and manufacturing quality level, such as researching new structure, optimizing steel material, improving production technology level, etc. "; Second, improve the safety management technology level of product application, such as performance testing, rati...

AI Technical Summary

Problems solved by technology

Therefore, when the steel wire rope member is in a strong magnetized H field, each layer of material (steel wire) has a phenomenon of "leaking" a large amount of magnetic field lines to the interlayer air gap (air gap), and the outermost layer "leaks" directly to the air space "Magnetic force lines form a "structural leakage magnetic field". Since the shape of the steel wire rope is undulating and multi-surface magnetic leakage, it is obvious that the "structural leakage magnetic field" is complex and complex, which constitutes a complex "noise band" for detection.

Secondly, the magnetic permeability of the material is extremely low in the state of magnetic saturation and supersaturation (see image 3 ), which means that it is difficult or even impossible to "transmit" the magnetic field change information of the inner layer material of the steel wire rope, and the "leakage magnetic field" required for detection can only rely on the "critical effect" and "Magnetic flux skin effect"

Third, the sensor used is a one-way (receiving) magnetoelectric conversion working mode; there is no reliable working information carrier between the passive working sensor and the wire rope, and it can only wait for the generation and change of the external magnetic field, which belongs to the "magnetic field external placement type". "

We can only take the visible "number of broken wires" and "average wear depth" on the surface of the wire rope as dimensions to fuzzily measure the degree of damage; The phenomenon itself cannot determine its degree of influence on the mechanical properties of steel wire rope components. Similarly, "wear" (LMA) only represents the average loss degree, ignoring the difference in severity of different parts of this continuous damage, and there is no way to find out and evaluate steel wire rope components. Mechanical elements of load-carrying capacity—the most dangerous (small) section

Such technical recognition patterns are far from meeting the basic conditions of modern applications

[0008] 6. Evaluation technology: "Traditional technology types" have hardly established an evaluation system that uses its own technical means to make comprehensive judgments on changes in the load performance (carrying capacity) of steel wire rope components using test results

Practice has proved that the general "defect" phenomenon that is visible on the surface of the steel wire rope component cannot effectively characterize the overall performance of the steel wire rope component; the similar uncertain "evaluation technology" creates a huge waste of material resources, and at the same time appeases the hidden dangers of catastrophic threats

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