阅读说明：本技术 一种基于电磁互感的钢丝绳损伤检测装置及检测方法 (Steel wire rope damage detection device and detection method based on electromagnetic mutual inductance ) 是由 范伟 任仙芝 李兵 任尚坤 于 2020-07-30 设计创作，主要内容包括：本发明公开了一种基于电磁互感的钢丝绳损伤检测装置及检测方法,该装置采用直流电源激励线圈、交流电源激励线圈和检测信号线圈叠加缠绕在无磁塑料管上,待检测钢丝绳在无磁塑料管内移动进行损伤检测；激励源采用直流电源加交流激励电源的双电源激励模式,可提高钢丝绳损伤的检测灵敏度；直流电源激励线圈、交流电源激励线圈和检测信号线圈相互独立,既简单方便又稳定可靠。本发明可以有效检测和定位钢丝绳的磨损、断丝等损伤状况,具有重要的实用价值。(The invention discloses a steel wire rope damage detection device and a detection method based on electromagnetic mutual inductance, wherein the device adopts a direct-current power supply exciting coil, an alternating-current power supply exciting coil and a detection signal coil which are overlapped and wound on a non-magnetic plastic pipe, and a steel wire rope to be detected moves in the non-magnetic plastic pipe for damage detection; the excitation source adopts a double-power excitation mode of a direct-current power supply and an alternating-current excitation power supply, so that the detection sensitivity of the damage of the steel wire rope can be improved; the direct-current power supply exciting coil, the alternating-current power supply exciting coil and the detection signal coil are mutually independent, so that the method is simple, convenient, stable and reliable. The invention can effectively detect and position the damage conditions of abrasion, broken wires and the like of the steel wire rope and has important practical value.)

1. A steel wire rope damage detection device based on electromagnetic mutual inductance is characterized by comprising a direct-current power supply, an alternating-current excitation power supply, a voltage signal detection system, a direct-current power supply excitation coil, an alternating-current power supply excitation coil, a detection signal coil and a non-magnetic plastic pipe, wherein the direct-current power supply excitation coil, the alternating-current power supply excitation coil and the detection signal coil are wound on the non-magnetic plastic pipe in a superposed manner; the direct current power supply is connected with the direct current power supply exciting coil, the alternating current exciting power supply is connected with the alternating current power supply exciting coil, and the voltage signal detection system is connected with the detection signal coil.

2. The method for detecting the damage of the steel wire rope based on the electromagnetic mutual inductance as claimed in claim 1, characterized by comprising the following steps:

s1, determining the working frequency of an alternating current excitation power supply: the alternating current excitation power supply supplies power to the alternating current power supply excitation coil, a complete steel wire rope and a damaged steel wire rope are respectively placed in the non-magnetic plastic pipe, the relationship between detection signals of the two steel wire ropes and the frequency of the excitation signals of the alternating current excitation power supply is recorded through the voltage signal detection system by changing the frequency of the excitation signals of the alternating current excitation power supply, and the frequency of the excitation signals corresponding to the maximum value of the difference between the detection signals of the two steel wire ropes is the working frequency of the alternating current excitation power supply;

s2, determining the working voltage of the direct-current power supply: the AC excitation power supply supplies power to the AC power supply excitation coil by using the working frequency of the AC excitation power supply determined in S1, the DC power supply supplies power to the DC power supply excitation coil, the intact steel wire rope and the damaged steel wire rope in S1 are respectively placed into non-magnetic plastic tubes, under the determined working frequency of the AC excitation power supply, the voltage of the DC power supply is changed, the relation between the detection signals of the intact steel wire rope and the damaged steel wire rope and the voltage of the DC power supply is recorded by a voltage signal detection system, and the DC power supply voltage corresponding to the maximum value of the difference between the detection signals of the two steel wire ropes is the working voltage of the DC power supply;

s3, detecting and judging the damage degree and the characteristics of the steel wire rope: the method comprises the steps that an alternating current excitation power supply supplies power to an alternating current power supply excitation coil by using the working frequency of the alternating current excitation power supply determined in S1, a direct current power supply supplies power to the direct current power supply excitation coil by using the working voltage of the direct current power supply determined in S2, the intact steel wire rope in S1 is placed into a non-magnetic plastic pipe, the detection signal of the intact steel wire rope is recorded by a voltage signal detection system, the steel wire ropes with different damage characteristics are placed into the non-magnetic plastic pipe, the detection signals of the steel wire ropes with different damage characteristics are recorded by the voltage signal detection system, and the change relation between the intact steel wire rope detection signal and the steel wire rope detection signals with different damage characteristics is compared, so that the detection and the.

Technical Field

The invention relates to the technical field of nondestructive testing, in particular to a device and a method for detecting damage of a steel wire rope based on electromagnetic mutual inductance.

Background

The steel wire rope is used as a bearing and transporting part of people or objects, is widely applied to the fields of elevators, suspension bridges, ropeways, cranes, mines and the like, and is a 'life line' in the industrial field. The steel wire rope can have the phenomena of fatigue, corrosion, abrasion, wire breakage, even fracture and the like in the using process, so that the bearing capacity and the reliability of the steel wire rope are reduced, and the direct relation is between the life and property safety of people. Therefore, the nondestructive testing and the service life prediction of the steel wire rope are very important.

The main factors affecting the life of a steel cord are numerous. The steel wire rope mainly comprises production process factors, use process factors, overload condition factors, corrosion degree factors and the like of the steel wire rope. In the using process of the steel wire rope, the service life of the steel wire rope can be obviously shortened due to various damages. Mechanical damage is one of the common damages of steel wire ropes, mainly manifested as corrosion, overload, abrasion, wire breakage, etc. The broken wire mainly comprises the types of fatigue broken wire, corrosion broken wire, abrasion broken wire, tension broken wire and the like; the wire rope wear is mainly divided into external wear and internal wear. The external abrasion is mainly the abrasion caused by repeated friction between the outer surface of the steel wire rope and the surfaces of objects such as a rope pulley and the like. The internal abrasion mainly means that the pressure of the steel wire rope is concentrated on one side when the steel wire rope is used, and the steel wire rope generates acting force mutually when being bent, so that the acting force between strands and between wires is changed continuously, and the internal abrasion of the steel wire rope is caused; overload factors (excessive transient impact) can cause the service life of the steel wire rope to be shortened. The steel wire rope has trace necking and local abrasion due to overload, and when the load exceeds the plastic deformation limit of the steel wire or the instantaneous impact force is too large, the steel wire rope can be locally broken or the whole steel wire rope is broken; corrosion is also a major factor in reducing the life of steel wire ropes. Because the working environment of the steel wire rope is severe, the steel wire rope reacts with various corrosive substances, and the surface layer of the steel wire rope can generate chemical reaction to form grooves. Substances with acid and alkali corrosiveness wash away the anticorrosion grease on the surface and inside of the steel wire rope, and the corrosion process can be accelerated. Typically corrosion damage exceeds the damage to the steel cord from normal wear and fatigue effects.

The damage detection of the steel wire rope can be roughly divided into three types, namely, section Loss detection (LMA, Loss of metallurgical area), namely large-area abrasion, corrosion, steel wire rope diameter reduction and the like; local damage detection (LF), such as wire breakage, corrosion, etc.; structural defect detection (SF), i.e., distortion of normal Structure, such as loose filaments, deformation, etc. The current basic methods for nondestructive testing of steel wire ropes include electromagnetic flux leakage detection, acoustic emission detection, ultrasonic detection, current detection, eddy current detection, infrared detection, X-ray detection and optical detection. At present, each method has respective limitation and cannot meet the high requirement of safe production in modern industry. The invention designs a steel wire rope damage detection sensor based on electromagnetic mutual inductance, which can reflect the damage degree of a steel wire rope with high sensitivity.

Disclosure of Invention

Aiming at the defects of the existing mode, the invention provides a steel wire rope damage detection device and a detection method based on electromagnetic mutual inductance, and provides an electromagnetic induction detection method with highest detection sensitivity for detecting and evaluating the damage degree of the steel wire rope.

The invention adopts the following technical scheme that the device for detecting the damage of the steel wire rope based on the electromagnetic mutual inductance comprises a direct-current power supply, an alternating-current excitation power supply, a voltage signal detection system, a direct-current power supply excitation coil, an alternating-current power supply excitation coil, a detection signal coil and a non-magnetic plastic pipe, wherein the direct-current power supply excitation coil, the alternating-current power supply excitation coil and the detection signal coil are wound on the non-magnetic plastic pipe in a superposed manner; the direct current power supply is connected with the direct current power supply exciting coil, the alternating current exciting power supply is connected with the alternating current power supply exciting coil, and the voltage signal detection system is connected with the detection signal coil.

A detection method of the electromagnetic mutual inductance-based steel wire rope damage detection device comprises the following steps:

s1, determining the working frequency of an alternating current excitation power supply: the alternating current excitation power supply supplies power to the alternating current power supply excitation coil, a complete steel wire rope and a damaged steel wire rope are respectively placed in the non-magnetic plastic pipe, the relationship between detection signals of the two steel wire ropes and the frequency of the excitation signals of the alternating current excitation power supply is recorded through the voltage signal detection system by changing the frequency of the excitation signals of the alternating current excitation power supply, and the frequency of the excitation signals corresponding to the maximum value of the difference between the detection signals of the two steel wire ropes is the working frequency of the alternating current excitation power supply;

s2, determining the working voltage of the direct-current power supply: the AC excitation power supply supplies power to the AC power supply excitation coil by using the working frequency of the AC excitation power supply determined in S1, the DC power supply supplies power to the DC power supply excitation coil, the intact steel wire rope and the damaged steel wire rope in S1 are respectively placed into non-magnetic plastic tubes, under the determined working frequency of the AC excitation power supply, the voltage of the DC power supply is changed, the relation between the detection signals of the intact steel wire rope and the damaged steel wire rope and the voltage of the DC power supply is recorded by a voltage signal detection system, and the DC power supply voltage corresponding to the maximum value of the difference between the detection signals of the two steel wire ropes is the working voltage of the DC power supply;

s3, detecting and judging the damage degree and the characteristics of the steel wire rope: the method comprises the steps that an alternating current excitation power supply supplies power to an alternating current power supply excitation coil by using the working frequency of the alternating current excitation power supply determined in S1, a direct current power supply supplies power to the direct current power supply excitation coil by using the working voltage of the direct current power supply determined in S2, the intact steel wire rope in S1 is placed into a non-magnetic plastic pipe, the detection signal of the intact steel wire rope is recorded by a voltage signal detection system, the steel wire ropes with different damage characteristics are placed into the non-magnetic plastic pipe, the detection signals of the steel wire ropes with different damage characteristics are recorded by the voltage signal detection system, and the change relation between the intact steel wire rope detection signal and the steel wire rope detection signals with different damage characteristics is compared, so that the detection and the.

The invention has the following outstanding advantages:

1. the excitation source adopts a double-power excitation mode of a direct-current power supply and an alternating-current excitation power supply, so that the detection sensitivity of the damage of the steel wire rope can be improved; the direct-current power supply exciting coil, the alternating-current power supply exciting coil and the detection signal coil are mutually independent, so that the method is simple, convenient, stable and reliable.

2. The invention can effectively detect and position the damage degree and the characteristics of the steel wire rope, such as the damage conditions of abrasion, wire breakage and the like, and has important practical value.

Drawings

Fig. 1 is a schematic structural diagram of a wire rope damage detection device based on electromagnetic mutual inductance.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.

The invention provides a steel wire rope damage detection device based on electromagnetic mutual inductance and provides an electromagnetic induction detection method with high detection sensitivity, which is used for detecting and evaluating the damage degree of a steel wire rope and finding the damage degree and the residual service life of the steel wire rope in advance. The specific implementation method comprises the following steps:

referring to fig. 1, a steel wire rope damage detection device based on electromagnetic mutual inductance comprises a direct current power supply 1, an alternating current excitation power supply 2, a voltage signal detection system 3, a direct current power supply excitation coil 4, an alternating current power supply excitation coil 5, a detection signal coil 6 and a non-magnetic plastic pipe 7; the direct current power supply exciting coil 4, the alternating current power supply exciting coil 5 and the detection signal coil 6 are wound on the non-magnetic plastic pipe 7 in a superposed manner; the direct current power supply 1 is connected with the direct current power supply exciting coil 4, the alternating current exciting power supply 2 is connected with the alternating current power supply exciting coil 5, and the voltage signal detection system 3 is connected with the detection signal coil 6.

The device adopts a double-power excitation mode of a direct-current power supply 1 and an alternating-current excitation power supply 2, and a direct-current power supply excitation coil 4 and an alternating-current power supply excitation coil 4 are mutually independent. And in the double power sources connected into the double coils, magnetic fields generated by the double exciting coils are mutually superposed in the area of the steel wire rope 8 to be detected. The steady magnetic field generated by the direct current power supply 1 determines the magnetization state of the steel wire rope 8 to be detected when in measurement, the alternating magnetic field generated by the alternating current excitation power supply 2 can determine the differential permeability of a working point of the steel wire rope 8 to be detected when in measurement, the purpose is to improve the detection sensitivity of the damage of the steel wire rope, and the detection sensitivity of a detection signal is related to the excitation frequency of the alternating current excitation power supply 2 and the voltage of the direct current power supply 1.

The detection method of the steel wire rope damage detection device based on electromagnetic mutual inductance comprises the following steps:

s1, determining the working frequency of an alternating current excitation power supply: the alternating current excitation power supply supplies power to the alternating current power supply excitation coil, a complete steel wire rope and a damaged steel wire rope are respectively placed in the non-magnetic plastic pipe, the relationship between detection signals of the two steel wire ropes and the frequency of the excitation signals of the alternating current excitation power supply is recorded through the voltage signal detection system by changing the frequency of the excitation signals of the alternating current excitation power supply, and the frequency of the excitation signals corresponding to the maximum value of the difference between the detection signals of the two steel wire ropes is the working frequency of the alternating current excitation power supply;

s2, determining the working voltage of the direct-current power supply: the AC excitation power supply supplies power to the AC power supply excitation coil by using the working frequency of the AC excitation power supply determined in S1, the DC power supply supplies power to the DC power supply excitation coil, the intact steel wire rope and the damaged steel wire rope in S1 are respectively placed into non-magnetic plastic tubes, under the determined working frequency of the AC excitation power supply, the voltage of the DC power supply is changed, the relation between the detection signals of the intact steel wire rope and the damaged steel wire rope and the voltage of the DC power supply is recorded by a voltage signal detection system, and the DC power supply voltage corresponding to the maximum value of the difference between the detection signals of the two steel wire ropes is the working voltage of the DC power supply;

s3, detecting and judging the damage degree and the characteristics of the steel wire rope: the method comprises the steps that an alternating current excitation power supply supplies power to an alternating current power supply excitation coil by using the working frequency of the alternating current excitation power supply determined in S1, a direct current power supply supplies power to the direct current power supply excitation coil by using the working voltage of the direct current power supply determined in S2, the intact steel wire rope in S1 is placed into a non-magnetic plastic pipe, the detection signal of the intact steel wire rope is recorded by a voltage signal detection system, the steel wire ropes with different damage characteristics are placed into the non-magnetic plastic pipe, the detection signals of the steel wire ropes with different damage characteristics are recorded by the voltage signal detection system, and the change relation between the intact steel wire rope detection signal and the steel wire rope detection signals with different damage characteristics is compared, so that the detection and the.

Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.