Steel wire rope nondestructive detection device and detection method

Abstract

The invention provides a steel wire rope nondestructive detection device and method, the detection device comprises a shell, a signal processing module and a plurality of probes, the shell is provided with a detection cavity, the detection cavity penetrates through the shell along the axial direction of the shell, and the detection cavity is used for placing a steel wire rope; the plurality of probes are arranged on the inner wall of the detection cavity, and each probe is connected with the signal processing module through a wire; the probe comprises an excitation coil and two detection coils, the two detection coils are located on the two sides of the excitation coil, and the excitation coil and the detection coils are coaxially arranged, so that the detection coils can be most effectively coupled with eddy current magnetic field signals generated by the excitation coil and modulated by defects, and the signal acquisition efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology for wire ropes, and in particular to a nondestructive testing device and method for wire ropes. Background Technology

[0002] Steel wire rope is a flexible load-bearing component made of multiple high-strength steel wires twisted together. Due to its excellent tensile strength, toughness, and wear resistance, it is widely used in critical fields such as elevators, cranes, mining hoisting equipment, cable-stayed bridges, and offshore platforms. However, during long-term service, steel wire ropes are continuously subjected to complex alternating loads, bending fatigue, and corrosion from harsh environments (such as humid and corrosive media), making them highly susceptible to defects such as wire breakage, wear, changes in cross-sectional shape, localized corrosion, and fatigue damage. These defects significantly reduce their load-bearing capacity, posing serious safety hazards, and failure could lead to catastrophic consequences. Therefore, regular and effective non-destructive testing of in-service steel wire ropes is of paramount importance for ensuring the safety of life and property.

[0003] Currently, non-destructive testing methods for steel wire ropes mainly include magnetic particle testing, ultrasonic testing, radiographic testing, and eddy current testing based on the principle of electromagnetic induction. Among these, eddy current testing technology is considered a highly efficient testing method suitable for steel wire ropes due to its high sensitivity to surface and near-surface defects such as cracks and corrosion in metal components, and the fact that it does not require a tight coupling agent. Its basic principle is: eddy currents are induced in the steel wire rope by an excitation coil. When a defect exists, the distribution and magnitude of the eddy currents are distorted, causing a change in the spatial magnetic field. This change signal can be captured by a detection coil to achieve defect identification.

[0004] Traditional eddy current sensors have limited ability to capture weak magnetic field distortion signals caused by minute defects (such as early wire breakage or hidden rust spots), resulting in low signal-to-noise ratio, easy missed detection, and difficulty in meeting the requirements of high-precision detection. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a non-destructive testing device for steel wire ropes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The non-destructive testing device for steel wire ropes includes: The housing has a detection cavity that extends through the housing along its axial direction and is used to insert a steel wire rope. Signal processing module; Multiple probes are disposed on the inner wall of the detection cavity, and each probe is connected to the signal processing module via a wire. The probe includes an excitation coil and two detection coils, with the two detection coils located on both sides of the excitation coil and the excitation coil and the detection coil being coaxially arranged.

[0007] In a preferred embodiment, the two detection coils are symmetrically arranged on both sides of the excitation coil.

[0008] In a preferred embodiment, a plurality of probes are arranged at circumferential intervals along the housing, and all the probes are located on the same cross section in the axial direction of the housing.

[0009] In a preferred embodiment, an adjustment slot is further included, the adjustment slot comprising: A guide rod is connected to the inner wall of the detection cavity and extends radially along the housing; A fixed base on which the probe is mounted is slidably mounted on the guide rod.

[0010] In a preferred embodiment, the adjustment slot further includes: Nut, which is threadedly connected to the guide rod; A support column is sleeved on the outside of the guide rod, one end of the support column is connected to the fixed base, and the other end of the support column is connected to the nut.

[0011] Rotating the nut causes it to move axially along the guide rod, thereby pushing the support column and causing the fixed seat and probe to slide along the guide rod.

[0012] In a preferred embodiment, the mounting base is provided with an interface, and the probe is plugged into the interface.

[0013] In a preferred embodiment, the housing includes two side shells that are hinged together, and the inner walls of the two side shells together form the detection cavity when they are closed.

[0014] In a preferred embodiment, the inner wall of the detection chamber is provided with a wear-resistant layer.

[0015] This invention also provides a non-destructive testing method for steel wire ropes, comprising the following steps: A steel wire rope is placed into the detection chamber of the housing. The inner wall of the detection chamber is equipped with a probe. The probe includes an excitation coil and two detection coils. The two detection coils are arranged coaxially on both sides of the excitation coil. The wire rope and the probe are made to move relative to each other in the axial direction. During the relative axial movement, an excitation magnetic field is applied to the wire rope through the excitation coil, and the response signal induced by the excitation magnetic field in the wire rope is acquired by the two detection coils in a differential manner. The response signal is processed to determine the defects in the wire rope.

[0016] In a preferred embodiment, the method further includes the following steps: Adjust the radial position of the probe set on the inner wall of the detection chamber to maintain a preset distance between the probe and the surface of the wire rope.

[0017] Compared with existing technologies, this technical solution has the following advantages: The coaxial structure enables the probe coil to most effectively couple the magnetic field signal generated by the excitation coil and modulated by the wire rope defect.

[0018] Symmetric gradient difference design can suppress interference from uniform magnetic fields in the environment, while being extremely sensitive to local magnetic field gradients caused by defects, thus fundamentally and significantly improving the signal-to-noise ratio of the system.

[0019] The integrated coaxial design saves space and facilitates the miniaturization of the probe and the entire detection device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the non-destructive testing device for steel wire ropes described in this invention. Figure 2 This is a schematic diagram showing the positional relationship between the probe and the wire rope described in this invention; Figure 3 This is a schematic diagram of the structure of the adjusting card holder described in this invention.

[0021] In the diagram: 100 housing, 100a detection chamber, 110 side shell, 200 signal processing module, 300 probe, 310 excitation coil, 320 detection coil, 400 wire, 500 adjusting bracket, 510 guide rod, 520 fixing base, 530 nut, 540 support column, 600 wire rope. Detailed Implementation

[0022] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0023] First Embodiment Please refer to Figure 1 and Figure 2 An embodiment of the present invention provides a non-destructive testing device for steel wire ropes, comprising: The housing 100 is provided with a detection cavity 100a, which extends through the housing 100 along the axial direction of the housing 100 and is used to insert a steel wire rope 600. Signal processing module 200; Multiple probes 300 are disposed on the inner wall of the detection cavity 100a, and each probe 300 is connected to the signal processing module 200 via a wire 400. The probe 300 includes an excitation coil 310 and two detection coils 320. The two detection coils 320 are located on both sides of the excitation coil 310, and the excitation coil 310 and the detection coils 320 are coaxially arranged.

[0024] When current is applied to the excitation coil 310, an excitation magnetic field is generated. This magnetic field acts on the conductor, the steel wire rope 600, inducing eddy currents within the steel wire rope 600 according to the law of electromagnetic induction. When a defect exists in the steel wire rope 600, it disturbs the distribution of the eddy currents, causing them to become distorted. This distorted eddy current then excites a corresponding spatially distorted magnetic field. By capturing this distorted magnetic field, the detection coil 320 can output a response signal containing defect characteristic information, thereby achieving defect identification.

[0025] In this embodiment, the excitation coil 310 and the two detection coils 320 are coaxially arranged, enabling the detection coils 320 to most effectively couple the eddy current magnetic field signal generated by the excitation coil 310 and modulated by the defect, thereby improving signal acquisition efficiency. Simultaneously, the high spatial integration and compact structure facilitate miniaturization of the entire detection device, making it easy to install and use in confined spaces.

[0026] Two detection coils 320 are symmetrically arranged on both sides of the excitation coil 310. Uniform background noise in the environment (common-mode interference, such as geomagnetic field fluctuations and power frequency interference) acts almost simultaneously and equally on the two detection coils 320, which act as gradient coils. Due to their differential connection, this interference is largely canceled out in the output signal. The eddy current magnetic field distortion caused by defects is highly localized, generating a significant magnetic field gradient (differential-mode signal) at the two closely arranged detection coils 320. This design is extremely sensitive to such gradient signals, thus effectively extracting weak defect information. This coaxial symmetrical layout combined with differential measurement of gradient coils actively suppresses noise and enhances the signal, fundamentally and significantly improving the overall signal-to-noise ratio, enabling stable detection of minute defects in the wire rope 600 even in complex industrial environments.

[0027] like Figure 1As shown, the housing 100 adopts a split-type split structure, specifically including two symmetrical side shells 110. The two side shells 110 are hinged to each other on one side, allowing them to open and rotate around the hinge axis. When the two side shells 110 are closed around the hinge, their inner walls together form the detection cavity 100a, which is used to accommodate and detect the passing wire rope 600. During detection, simply open the shell 100, wrap it around and lock it onto any section of the wire rope 600 to be tested. This feature allows the device to be easily applied to long, in-service wire ropes that are already installed, solving the technical pain point of difficult installation in traditional axle-type devices. To further ensure the stable closure of the housing during testing, a snap-fit ​​structure (such as a latch, buckle, or tenon) is provided on the other side of the two side shells 110 (i.e., the side opposite to the hinge side). After closing, the two side shells 110 can be firmly locked by this snap-fit ​​structure. The detection cavity 100a has a circular cross-section, and its diameter can be selected from various specifications such as 10mm, 20mm, 30mm, 40mm, and 50mm to accommodate steel wire ropes 600 of different diameters. The outer contour of the housing 100 can be square or circular.

[0028] The side shell 110 can be made of aluminum alloy, which has good corrosion resistance and wear resistance.

[0029] The diameter of the detection cavity 100a is larger than the diameter of the wire rope 600, with a difference of 2-5 mm. This ensures that after the wire rope 600 is inserted, a certain gap remains between its outer surface and the inner wall of the detection cavity 100a. This gap ensures that the wire rope 600 can slide smoothly axially and avoids jamming.

[0030] Furthermore, the inner wall of the detection chamber 100a is provided with a wear-resistant layer, which is preferably made of engineering plastics (such as polytetrafluoroethylene PTFE, polyamide PA) or composite materials, possessing low friction coefficients and high wear resistance. The inner surface of the wear-resistant layer is processed to be extremely smooth. The smooth, low-friction surface minimizes the scraping or wear that may occur between the wire rope 600 and the inner wall when passing through at high speed, thus protecting the wire rope being tested. When the wire rope 600 contacts the inner wall due to swinging, the wear-resistant layer provides effective buffering and damping, significantly reducing vibration and noise caused by friction and collision. This prevents vibration from interfering with the signal acquisition of the high-sensitivity probe 300 (especially the quantum magnetometer).

[0031] like Figure 1 and Figure 2As shown, both the excitation coil 310 and the detection coil 320 are circular. The excitation coil 310 and the two detection coils 320 are coaxially arranged, meaning that their central axes coincide, forming a common axis. The extension direction of this common axis is set to be parallel to the central axis of the detection cavity 100a.

[0032] When the wire rope 600 is placed into the detection chamber 100a, its common axis remains parallel or substantially parallel to the axis of the wire rope 600. This parallel and aligned axial relationship allows the excitation magnetic field generated by the excitation coil 310 to penetrate the cross-section of the wire rope 600 along an optimal symmetrical path, thereby inducing a more uniform and symmetrical eddy current field within it. When a defect occurs, it can cause a more significant and easily detectable magnetic field distortion. The two detection coils 320 are symmetrically arranged on both sides of the excitation source and parallel to the axis of the wire rope 600, ensuring that their detection environment is geometrically highly symmetrical. This allows them to have comparable detection sensitivity for the wire rope 600. The parallel axis is the geometric basis for subsequent high-precision differential measurements. The signals acquired by the two detection coils 320 are comparable due to their symmetrical positions, thus effectively canceling common-mode environmental noise through differential operations and accurately extracting the small differential-mode signals caused by defects.

[0033] like Figure 1 As shown, in order to achieve all-round detection of the outer circumference of the wire rope 600 without blind spots, multiple probes 300 are evenly distributed along the circumference of the housing 100 (i.e., the detection cavity 100a). In a preferred embodiment, the number of probes 300 is four. These four probes 300 are arranged at equal angular intervals, i.e., the central angle between any two adjacent probes 300 is 90°. This arrangement ensures that each probe 300 is responsible for detecting a 90° sector area on the cross-section of the wire rope 600. The four probes work together to seamlessly cover the entire 360° circumference of the wire rope 600, ensuring that surface or near-surface defects in any direction can be effectively captured by at least one probe, completely eliminating blind spots. Furthermore, all probes 300 are located within the same cross-section along the axial direction of the housing 100. When the wire rope 600 passes through the detection chamber 100a along the axial direction, at the same moment, all probes 300 are detecting different areas of the same cross-sectional circumference on the wire rope.

[0034] like Figure 1 As shown, each probe 300 is electrically connected to the signal processing module 200 via an independent wire 400. The wire 400 is preferably embedded inside the housing 100 or in a pre-set wire groove. This wiring method not only makes the appearance neat, but also effectively protects the cable, preventing it from being scratched or damaged under complex working conditions, and ensuring the reliability and safety of the signal transmission path. The signal processing module 200 is used to receive and process the response signal from the probe 300. It includes at least: Signal conditioning unit: performs low-noise amplification of the pole response signal output by the detection coil 320. Filtering unit: Uses hardware filters (such as bandpass filters) to initially filter out high-frequency noise and power frequency interference and other out-of-band clutter in the signal. Analog-to-digital (A / D) conversion unit: converts the conditioned and filtered analog signal into a digital signal with high precision. Data processing unit: responsible for running signal processing algorithms and completing preliminary data analysis, buffering, and transmission control. The data interface of the signal processing module 200 (such as Ethernet port, USB or RS-485) supports high-speed data interaction with the host computer, enabling independent operation of a single device or synchronous, distributed detection of long-distance steel wire ropes by multiple devices through networking. Its power interface provides a stable and clean power supply for all unit circuits of the entire module. Crucially, to cope with the severe electromagnetic interference environment of industrial sites, the entire signal processing module 200 is encapsulated in a metal shielded box (such as an aluminum alloy or galvanized steel shell). This significantly isolates external electromagnetic fields from interference with the internal sensitive analog and digital circuits, greatly improving the system's stability and signal-to-noise ratio in complex electromagnetic environments.

[0035] like Figure 3 As shown, the wire rope non-destructive testing device further includes an adjusting bracket 500, which comprises: Guide rod 510, the guide rod 510 is connected to the inner wall of the detection cavity 100a, and the guide rod 510 extends radially along the housing 100; A fixed base 520 is provided, on which the probe 300 is mounted, and the fixed base 520 is slidably disposed on the guide rod 510.

[0036] By sliding the fixed base 520 along the axial (i.e. radial) direction of the guide rod 510, the probe 300 mounted on it can be moved synchronously. This allows for adjustable distance between the probe 300 and the wire rope 600.

[0037] By adjusting the distance between the probe 300 and the wire rope 600 to 10mm, the probe 300 will not directly contact or rub against the surface of the wire rope 600, thereby effectively protecting the high-precision probe 300 and the wire rope 600.

[0038] like Figure 3 As shown, the adjusting bracket 500 further includes: Nut 530, which is threadedly connected to guide rod 510; A support column 540 is sleeved outside the guide rod 510. One end of the support column 540 is connected to the fixed base 520, and the other end of the support column 540 is connected to the nut 530, for example, in a rotatable relationship (e.g., by embedding a thrust bearing or designing a smooth, low-friction end face).

[0039] When the radial position of probe 300 needs to be adjusted, the operator rotates nut 530. Since nut 530 is threadedly connected to fixed guide rod 510, its rotational motion is converted into linear movement along the axis of guide rod 510. The linear movement of nut 530 then pushes the support column 540, which in turn transmits the thrust to fixed seat 520, ultimately causing the entire probe 300 to slide radially along guide rod 510, thereby adjusting the distance between probe 300 and wire rope 600.

[0040] The nut 530 is threadedly connected to the guide rod 510. The threaded pair has a self-locking characteristic, which can reliably lock the position of the probe 300 after adjustment, effectively preventing probe displacement caused by vibration during detection and avoiding signal drift or distortion.

[0041] The mounting base 520 is provided with an interface, and the probe 300 can be plugged into the interface for easy replacement of the probe 300.

[0042] The interface integrates conductive contacts. When the probe 300 is correctly inserted into the interface, while mechanical locking is completed, the excitation coil 310 and the detection coil 320 of the probe 300 automatically establish an electrical connection with the wires 400 embedded in the fixing base 520 and the housing 100 through the contacts inside the interface.

[0043] In summary, the coaxial structure enables the detection coil 320 to most effectively couple the magnetic field signal generated by the excitation coil 310 and modulated by the defect via the steel wire rope 600. The symmetrical gradient differential design naturally suppresses interference from uniform magnetic fields in the environment (common-mode noise), while being extremely sensitive to local magnetic field gradients (differential-mode signals) caused by defects, thus fundamentally and significantly improving the system's signal-to-noise ratio. The integrated coaxial design saves space and facilitates the miniaturization of the probe and the entire detection device.

[0044] Second Embodiment like Figure 1 As shown, the non-destructive testing method for wire rope includes the following steps: S1. Clean and pre-treat the surface of the steel wire rope 600.

[0045] Specifically, this involves removing impurities such as oil, dust, and rust adhering to the surface to ensure cleanliness. This step is crucial as it prevents impurities from interfering with subsequent magnetic field distribution and signal acquisition, thus ensuring the accuracy of the detection signal.

[0046] S2. Place the wire rope 600 into the detection cavity 100a of the housing 100. The inner wall of the detection cavity 100a is provided with a probe 300. The probe 300 includes an excitation coil 310 and two detection coils 320. The two detection coils 320 are coaxially arranged on both sides of the excitation coil 310.

[0047] Select a housing 100 of the appropriate specification according to the diameter of the wire rope 600. Then open the housing 100. Preferably, the diameter of the selected detection chamber 100a is 2-5 mm larger than the diameter of the wire rope 600 to provide a reasonable clearance for its operation.

[0048] Open the housing 100 (for example, open the hinged split side housing 110), place the pretreated wire rope 600 into the open detection chamber 100a, and then close and lock the housing 100 to complete the clamping.

[0049] The method further includes the following steps: Adjust the radial position of the probe 300, which is mounted on the inner wall of the detection chamber 100a, to maintain a preset distance between the probe 300 and the surface of the wire rope 600. The preset distance is approximately 10 mm. The adjustment of the distance between the probe 300 and the wire rope 600 is described in the first embodiment and will not be repeated here.

[0050] S3. Cause relative axial movement between the wire rope 600 and the probe 300; during the relative axial movement, apply an excitation magnetic field to the wire rope 600 through the excitation coil 310, and collect the response signal induced by the excitation magnetic field in the wire rope 600 in a differential manner through two detection coils 320. The detection device and signal processing system 200 are powered on and the host computer detection control software is started. Parameters are set and the actuator is controlled via the software interface, causing the wire rope 600 to pass through the detection cavity 100a at a constant low speed within the range of 0.2 m / s to 0.5 m / s along its axis. This low-speed setting ensures that the probe 300 has sufficient time resolution to acquire the complete magnetic field signal, avoiding signal distortion or incomplete acquisition due to excessive speed, thus laying the foundation for subsequent high-precision analysis.

[0051] During the uniform speed operation of the wire rope 600, an alternating excitation magnetic field is applied to the wire rope 600 through the excitation coil 310, and the eddy current response signal is acquired in real time and synchronously through two coaxially arranged detection coils 320 in differential operating mode. The host computer software interface receives and plots the time-domain waveform of the signal in real time, providing continuous visual monitoring of the detection process. S4. Process the response signal to determine the defects of the wire rope 600.

[0052] When a waveform exhibits a clear abnormality matching a preset defect feature library (such as a peak or distortion of a specific amplitude or shape corresponding to wire breakage or wear), the system automatically records the precise timestamp of the abnormal event. Combined with the known wire rope running speed, the system can automatically calculate the axial position of the defect and provide real-time alarms and log recordings.

[0053] During the testing process, if the host computer monitoring interface detects abnormal baseline drift or the system determines through vibration sensors that the wire rope is swaying abnormally, potentially affecting testing accuracy, the operator or system should pause wire rope operation and data acquisition. The testing process should only resume after the equipment position has been readjusted, the fastening devices tightened, or the source of sway eliminated, to ensure the validity and reliability of the data.

[0054] After completing the inspection of the predetermined length of wire rope, the system performs post-processing and comprehensive analysis on the signal data collected throughout the process. This includes reviewing automatically recorded anomalies and performing more refined filtering and feature extraction on the signals. Finally, a structured inspection report is generated, which details the defect type, precise axial position, circumferential position (determined by probe number), dimensional assessment, and confidence level, and can be exported or uploaded to a database as needed. To verify the effectiveness of this method and the reliability of the device, the following performance tests can be performed: Select wire rope samples with pre-defined standard defects (such as minor wire breaks, localized wear, and latent corrosion) and fix them on the test platform. Use this device and method to perform the test according to steps S1-S4, and record the system's defect identification rate, positioning error, and single test time to quantify its detection performance. The testing device was fixed in place, and continuous measurements were performed on a stable standard magnetic field source. A stable power supply was connected, and continuous monitoring was conducted for 72 hours, recording the magnetic field measurement value every 2 hours. After the test, the deviation range of all recorded data was analyzed. If the maximum deviation did not exceed the preset allowable value, it proved that the equipment had good long-term operational stability and could meet the needs of continuous testing in industrial settings.

[0055] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A non-destructive testing device for steel wire ropes, characterized in that, include: The housing (100) is provided with a detection cavity (100a), which extends through the housing (100) axially and is used to insert a steel wire rope (600). Signal processing module (200); Multiple probes (300) are disposed on the inner wall of the detection cavity (100a), and each probe (300) is connected to the signal processing module (200) via a wire (400); The probe (300) includes an excitation coil (310) and two detection coils (320), with the two detection coils (320) located on both sides of the excitation coil (310), and the excitation coil (310) and the detection coil (320) being coaxially arranged.

2. The non-destructive testing device for steel wire rope as described in claim 1, characterized in that, The two detection coils (320) are symmetrically arranged on both sides of the excitation coil (310).

3. The non-destructive testing device for steel wire rope as described in claim 1, characterized in that, The plurality of probes (300) are arranged circumferentially spaced along the housing (100), and all the probes (300) are located in the same cross section in the axial direction of the housing (100).

4. The non-destructive testing device for steel wire rope as described in claim 1, characterized in that, It also includes an adjustment holder (500), the adjustment holder (500) comprising: A guide rod (510) is connected to the inner wall of the detection cavity (100a) and extends radially along the housing (100). A fixed base (520) is provided on which the probe (300) is mounted, and the fixed base (520) is slidably disposed on the guide rod (510).

5. The non-destructive testing device for steel wire rope as described in claim 4, characterized in that, The adjusting bracket (500) also includes: Nut (530), the nut (530) is threadedly connected to the guide rod (510); A support column (540) is sleeved on the outside of the guide rod (510). One end of the support column (540) is connected to the fixed seat (520), and the other end of the support column (540) is connected to the nut (530). Rotating the nut (530) causes the nut (530) to move axially along the guide rod, thereby pushing the support (540), which in turn causes the fixed seat (520) and the probe (300) to slide along the guide rod (510).

6. The non-destructive testing device for steel wire rope as described in claim 4, characterized in that, The mounting base (520) is provided with an interface, and the probe (300) is plugged into the interface.

7. The non-destructive testing device for steel wire rope as described in claim 1, characterized in that, The housing (100) includes two side shells (110), which are hinged together, and the inner walls of the two side shells (110) together form the detection cavity (100a) when they are closed.

8. The non-destructive testing device for steel wire rope as described in claim 1, characterized in that, The inner wall of the detection chamber (100a) is provided with a wear-resistant layer.

9. A non-destructive testing method for steel wire ropes, characterized in that, Includes the following steps: A wire rope (600) is placed into the detection chamber (100a) of the housing (100). The inner wall of the detection chamber (100a) is provided with a probe (300). The probe (300) includes an excitation coil (310) and two detection coils (320). The two detection coils (320) are arranged coaxially on both sides of the excitation coil (310). The wire rope (600) and the probe (300) are made to move relative to each other in the axial direction. During the relative axial movement, an excitation magnetic field is applied to the wire rope (600) through the excitation coil (310), and the response signal induced by the excitation magnetic field in the wire rope (600) is collected differentially by two detection coils (320). The response signal is processed to determine the defects of the wire rope (600).

10. The non-destructive testing method for steel wire rope as described in claim 9, characterized in that, The method further includes the following steps: Adjust the radial position of the probe (300) set on the inner wall of the detection chamber (100a) so that the probe (300) and the surface of the wire rope (600) maintain a preset distance.

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