CN-224231694-U - Miniaturized cable wire magnetic flux leakage flaw detection equipment

CN224231694UCN 224231694 UCN224231694 UCN 224231694UCN-224231694-U

Abstract

The utility model relates to a miniaturized steel cable magnetic flux leakage flaw detection device, which belongs to the technical field of steel cable nondestructive detection and comprises a magnetic shielding shell, a magnetizing device, a detecting device, an ultrasonic module and a control circuit. The magnetizing device adopts a Halbach permanent magnet array to construct a closed magnetic circuit. The detection device comprises a double-ring differentially arranged hall sensor array. The magnetic shielding shell encloses to form a closed detection chamber to isolate interference. Through the structural design, the high integration and miniaturization of flaw detection equipment are realized, the precision and reliability of detecting the small-diameter steel cable in a complex electromagnetic environment and a narrow space are remarkably improved, and meanwhile, the device has good portability and environmental adaptability.

Inventors

DU JIANG
ZHANG YANG
YANG MIN
Pu Bangming
XIE ZHONGSHAN
GONG YI

Assignees

中国人民解放军95633部队

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The miniaturized steel cable magnetic leakage flaw detection device is characterized by comprising a magnetic shielding shell (1), wherein the magnetic shielding shell (1) is enclosed to form a closed detection cavity for isolating the interference of an external magnetic field; The magnetizing device is arranged in the detection cavity and comprises a magnetic yoke body (2) and a height permanent magnet (4) and is used for carrying out saturation magnetization on a steel cable (8) passing through the detection cavity; The detection device comprises a plurality of Hall sensors (7) which are arranged in the detection cavity in an array form and are used for collecting magnetic leakage signals of the steel cable; The ultrasonic wave generation and reception integrated module (5) is arranged in the detection cavity and is used for transmitting ultrasonic waves to the steel cable and receiving echo signals; The signal amplification module (6) is arranged in the detection cavity, is electrically connected with the Hall sensor (7) and is used for pre-amplifying the magnetic leakage signal; and the control circuit is integrated in the detection chamber and is used for coordinating the time sequence control of the magnetizing device, the detection device and the signal processing unit.
2. A miniaturized steel cable magnetic leakage flaw detection device according to claim 1 is characterized in that the magnetic shielding shell (1) comprises a first magnetic shielding body (11), a second magnetic shielding body (12), a third magnetic shielding body (13) and a fourth magnetic shielding body (14) which form a magnetic shielding structure so as to enhance magnetic field stability.
3. The miniaturized steel cable magnetic leakage flaw detection device is characterized in that a closed magnetic circuit is constructed by adopting a Halbach permanent magnet array, the magnetic pole spacing is modularized and adjustable according to the diameter of a steel cable, the height permanent magnet (4) is made of N52-grade NdFeB material, and the magnetization intensity is more than or equal to 1.8T.
4. The miniaturized steel cable magnetic flux leakage flaw detection device according to claim 1, wherein the detection device is characterized in that the number of the Hall sensors (7) is eight, the Hall sensors are uniformly distributed around the steel cable in a matrix form of 2 rows and 4 columns, the lifting distance is 2mm, the Hall sensors (7) are AH3505 linear integrated Hall elements, and the sensitivity is 25.0mV/mT.
5. The miniaturized steel cable magnetic flux leakage flaw detection device according to claim 4, wherein the Hall sensor (7) adopts a double-ring differential arrangement mode, and comprises an A ring and a B ring, the axial distance between the two rings is 20mm, and the sensitivity directions of magnetic fields of Hall elements at corresponding positions in the rings are opposite, so that external interference is eliminated through differential processing; The signal amplification modules (6) are arranged in parallel along the axial direction of the steel cable to form one row, and the two rows of Hall sensors (7) are respectively positioned at the inner sides of the three signal amplification modules (6) and are distributed at intervals.
6. The miniaturized steel cable magnetic leakage flaw detection device according to claim 1, wherein an inner support body (3) is arranged inside the magnetic shielding shell (1), the inner support body (3) comprises a first support body (31) and a second support body (32) and is used for fixing the magnetic yoke body (2), the height permanent magnet (4), the ultrasonic wave generation and reception integrated module (5), the signal amplification module (6) and the Hall sensor (7), and structural stability is ensured.
7. The miniaturized steel cable magnetic flux leakage flaw detection device according to claim 6, wherein the magnetic yoke body (2) is fixedly arranged between the second magnetic shielding body (12) and the first supporting body (31), the number of the height permanent magnets (4) is two, the two height permanent magnets (4) are fixedly arranged in two grooves on one side of the first supporting body (31), and a mounting groove is arranged between the first supporting body (31) and the second supporting body (32) and used for placing and mounting the ultrasonic wave generation and reception integrated module (5), the signal amplification module (6) and the Hall sensor (7).
8. The miniaturized steel cable magnetic flux leakage flaw detection device according to claim 1, wherein the signal amplification module (6) is integrated with a zero setting circuit for eliminating static output voltage of the Hall element, and the zero setting circuit adopts a differential amplification structure and realizes zero setting by adjusting reference voltage through a potentiometer.
9. A miniaturized steel cable magnetic leakage flaw detection device according to claim 1 further comprising an eddy current detection coil integrated within the detection chamber for exciting a high frequency alternating magnetic field and detecting eddy current field disturbance signals caused by steel cable surface and near surface flaws.
10. A miniaturized steel cord magnetic leakage flaw detection apparatus according to claim 1, wherein: The overall dimension of the probe of the equipment is 130mm long by 60mm wide by 47mm high, the total weight is less than or equal to 1kg, the whole equipment comprises a storage box and an operation panel, the weight is less than or equal to 4kg, and the equipment is suitable for detection in a narrow space; The working temperature range of the equipment is-20 ℃ to +40 ℃, the relative humidity of the storage environment is less than or equal to 90% RH, and a modularized clamping device is adopted to support the rapid replacement and adaptation of the steel cable with the diameter of 2-6 mm.

Description

Miniaturized cable wire magnetic flux leakage flaw detection equipment Technical Field The utility model relates to the technical field of nondestructive testing of steel ropes, in particular to miniaturized steel rope magnetic flux leakage flaw detection equipment. Background The steel cable is used as a key bearing part and widely applied to bridges, elevators, aircrafts and various hoisting machines. Defects such as broken wires, corrosion, abrasion and the like in the interior or the surface of the steel plate can directly threaten the safety of the whole structure. Currently, nondestructive testing of steel cables relies primarily on manual inspection or conventional flaw detection equipment. The existing flaw detection equipment such as magnetic powder, ultrasonic waves and the like is large in size, complex in operation, high in detection environment requirement, particularly difficult to adapt to narrow space or field operation, and often faces the problems of insufficient sensitivity and weak anti-interference capability when high-precision quantitative detection is carried out on small-diameter steel ropes. In particular to the precise flaw detection of small-diameter steel ropes (such as the diameter of 2-6 mm), and the technical challenges are more remarkable. Conventional magnetic flux leakage detection equipment is difficult to realize uniform and sufficient saturation magnetization of a fine rope in a tiny space due to the limitation of magnetic circuit design, so that a magnetic flux leakage signal is weak, and a signal to noise ratio is low. Meanwhile, the existing equipment has limitations in the aspects of sensor integration level, external electromagnetic interference suppression and intelligent identification of multiple defect modes, and often cannot simultaneously consider detection precision, equipment portability and environmental adaptability. It is particularly notable that the single detection mode has inherent limitations that the magnetic flux leakage detection is sensitive to volume defects but has limited capability of identifying surface microcracks, the traditional eddy current detection is sensitive to surface and near surface defects, is easily influenced by skin effect and has low signal to noise ratio, and the ultrasonic detection is effective to internal defects but is difficult to identify surface fine damage. Therefore, there is a need in the industry for a miniaturized wire rope inspection device that integrates multi-modal sensing, is compact, detects precisely, and is suitable for use in complex field environments. Disclosure of utility model The utility model provides a miniaturized steel cable magnetic flux leakage flaw detection device for solving the problems in the prior art. In order to solve the technical problems, the utility model is realized by the following technical scheme that the miniaturized steel cable magnetic leakage flaw detection equipment comprises a magnetic shielding shell, wherein the magnetic shielding shell is enclosed to form a closed detection cavity for isolating the interference of an external magnetic field; The magnetizing device is arranged in the detection cavity and comprises a magnetic yoke body and a high permanent magnet, and is used for carrying out saturation magnetization on the steel cable passing through the detection cavity; The detection device comprises a plurality of Hall sensors which are arranged in an array form in the detection cavity and are used for collecting magnetic leakage signals of the steel cable; the ultrasonic wave generation and reception integrated module is arranged in the detection cavity and is used for transmitting ultrasonic waves to the steel cable and receiving echo signals; The signal amplification module is arranged in the detection cavity, is electrically connected with the Hall sensor and is used for pre-amplifying the magnetic leakage signal; And the control circuit is integrated in the detection chamber and is used for coordinating the time sequence control of the magnetizing device, the detection device and the signal processing unit. In a specific embodiment, the magnetic shield housing includes a first magnetic shield, a second magnetic shield, a third magnetic shield, and a fourth magnetic shield, forming a magnetic shield structure to enhance magnetic field stability. In a specific implementation mode, the magnetization device adopts a Halbach permanent magnet array to construct a closed magnetic circuit, the magnetic pole distance is modularly adjustable according to the diameter of a steel cable of 2-6mm, the high permanent magnet is made of N52-grade neodymium iron boron material, and the magnetization intensity is more than or equal to 1.8T. In a specific implementation mode, the number of the Hall sensors in the detection device is eight, the Hall sensors are uniformly distributed around the steel cable in a matrix form of 2 rows and 4 columns, the lifting distance is 2mm, the H