A non-destructive testing device for multi-excitation steel wire rope

Abstract

This invention discloses a non-destructive testing device for multi-excitation steel wire ropes, comprising: a housing capable of sliding along the steel wire rope; a combined excitation unit installed inside the housing, the combined excitation unit being used to magnetize the entire steel wire rope; a magnetic field line guiding unit fixed at the middle position inside the housing, the magnetic field line guiding unit being used to guide the interfering magnetic field lines formed between the permanent magnets in the axial magnetization direction of the combined excitation unit to itself; and a dual-row leakage magnetic field detection unit for detecting leakage magnetic field signals and determining the location of damage to the steel wire rope. This invention has advantages such as high magnetization intensity, long saturation period, simple operation, and convenient maintenance.

Description

Technical Field

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

[0002] As a type of flexible rope, steel wire rope serves functions such as transmission, load-bearing, and positioning, and is therefore widely used in industrial production, manufacturing, and transportation, becoming a key load-bearing component in various industries. However, most steel wire ropes operate under harsh conditions, in dusty, humid, and temperature-fluctuating environments, making them prone to wear, corrosion, and wire breakage. This can affect production efficiency and, in more serious cases, pose a significant threat to personal safety and cause substantial property damage.

[0003] Currently, non-destructive testing technologies for steel wire ropes mainly include ultrasonic testing, optical testing, acoustic emission testing, vibration testing, and magnetic point testing. Through comparative research on the principles, advantages, and disadvantages of different testing methods, electromagnetic testing is widely recognized as the most effective method for non-destructive testing of steel wire ropes.

[0004] Based on the characteristics of wire ropes, magnetizing the wire rope is the first step in electromagnetic detection using the leakage magnetic field method. Currently, magnetization methods include AC excitation, DC excitation, permanent magnet excitation, and composite excitation. Among these, permanent magnet excitation is one of the earliest excitation methods used in China. Due to its advantages such as requiring no power supply or matching heat dissipation equipment, ease of use, and simple overall structure, it is still widely used today. The permanent magnet, wire rope, armature, and air gap between the wire rope and the permanent magnet in the excitation assembly form a complete magnetic path. The magnetization state of the wire rope affects the sensor's detection range, detection accuracy, and signal-to-noise ratio of the detection signal. Therefore, a good magnetic circuit design is crucial.

[0005] Current non-destructive testing devices for wire ropes mainly suffer from problems such as low overall excitation intensity, short saturation length, and insufficient testing accuracy. Summary of the Invention

[0006] Therefore, it is necessary to provide a non-destructive testing device for multi-excitation wire ropes to address the aforementioned technical problems.

[0007] A non-destructive testing device for multi-excitation steel wire ropes includes:

[0008] The outer casing is able to slide along the steel wire rope;

[0009] A combined excitation unit is installed inside the housing, and the combined excitation unit is used to magnetize the entire wire rope;

[0010] A magnetic field line guiding unit is fixed at the middle position inside the housing. The magnetic field line guiding unit is used to guide the interfering magnetic field lines formed between the axially magnetized permanent magnets in the middle of the combined excitation unit to itself.

[0011] A dual-row magnetic flux leakage detection unit is used to detect magnetic flux leakage signals and determine the location of the breakage in the wire rope.

[0012] In one embodiment, the housing includes:

[0013] The upper outer shell has pulleys connected to its left and right sides via connectors, and the pulleys slide in contact with the wire rope.

[0014] The lower outer shell cooperates with the upper outer shell, and one side of the lower outer shell is connected to one side of the upper outer shell by a hinge.

[0015] In one embodiment, the outer surface of the upper housing is provided with a handle.

[0016] In one embodiment, the combined excitation unit includes:

[0017] The concave armature includes an upper concave armature and a lower concave armature symmetrically arranged, wherein the upper concave armature and the lower concave armature are respectively disposed inside the upper shell and the lower shell;

[0018] An intermediate permanent magnet is fixed inside the concave armature, and the intermediate permanent magnet is located on the left and right sides of the magnetic field line guiding unit;

[0019] The middle permanent magnet, the left permanent magnet, and the right permanent magnet are of the same size. The left and right permanent magnets are magnetized radially, with the left permanent magnet having an outer N pole and an inner S pole, and the right permanent magnet having an outer S pole and an inner N pole. The middle permanent magnet is magnetized axially, with the left pole having an outer N pole and the right pole having an inner S pole.

[0020] The left and right permanent magnets are both fixed inside the concave armature, and the left and right permanent magnets are located to the left and right of the middle permanent magnet, respectively.

[0021] The concave armature, the middle permanent magnet, the left permanent magnet, and the right permanent magnet have through holes distributed on the same straight line inside, and the steel wire rope is threaded through the through holes.

[0022] In one embodiment, the intermediate permanent magnet includes an upper intermediate permanent magnet and a lower intermediate permanent magnet that surround each other, the left permanent magnet includes an upper left permanent magnet and a lower left permanent magnet that surround each other, and the right permanent magnet includes an upper right permanent magnet and a lower right permanent magnet that surround each other.

[0023] The upper middle permanent magnet, the upper left permanent magnet, and the upper right permanent magnet are fixed inside the upper concave armature.

[0024] The lower middle permanent magnet, the lower left permanent magnet, and the lower right permanent magnet are fixed inside the lower concave armature.

[0025] In one embodiment, the left and right end faces of the concave armature are flush with the outer end faces of the left and right permanent magnets, respectively.

[0026] In one embodiment, the contact point between the concave armature and the inner sides of the left and right permanent magnets is an arc surface.

[0027] In one embodiment, the magnetic field line guiding unit includes a hollow ring made of soft magnetic material, the hollow ring being fixedly installed inside the concave armature and placed between the intermediate permanent magnets, and the steel wire rope being threaded through the hollow ring.

[0028] In one embodiment, the dual-row magnetic flux leakage detection unit includes:

[0029] The circuit board is fixed inside the magnetic field line guiding unit;

[0030] Multiple Hall elements are arranged in a detection ring and fixed on the circuit board, and the steel wire rope is threaded through the detection ring.

[0031] In one embodiment, the circuit boards are arranged in two rows and are fixed inside the magnetic field line guiding unit by a fixing bracket.

[0032] The aforementioned multi-excitation wire rope non-destructive testing device uses a housing to drive a combined excitation unit, a magnetic field line guiding unit, and a double-row leakage magnetic field detection unit to slide along the wire rope. The combined excitation unit magnetizes the entire wire rope, while the magnetic field line guiding unit increases the magnetic flux of the main magnetic flux loop and avoids interference from useless magnetic field lines, thereby improving the overall magnetization effect of the device on the wire rope. Finally, the double-row leakage magnetic field detection unit detects the leakage magnetic field signal and determines the location of the wire rope damage. It has advantages such as high excitation intensity, long excitation saturation, high accuracy, simple operation, and convenient maintenance. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a front structural schematic diagram of the multi-excitation steel wire rope non-destructive testing device of the present invention;

[0035] Figure 2 This is a schematic diagram of the back structure of the multi-excitation steel wire rope non-destructive testing device of the present invention;

[0036] Figure 3 This is a schematic diagram of the combined excitation unit of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of the dual-row magnetic flux leakage detection unit of the present invention;

[0038] Figure 5 This is a simulation diagram of the magnetic field line distribution after adding a magnetic field line guiding unit according to the present invention;

[0039] Figure 6 This is a simulation diagram of the magnetic field line distribution when the contact surfaces of the concave armature of the present invention with the left and right permanent magnets are at right angles.

[0040] Figure 7 This is a simulation diagram of the magnetic field line distribution when the contact surfaces between the concave armature and the left and right permanent magnets of the present invention are arc surfaces.

[0041] Figure 8 This is a simulation diagram of the structure and magnetic field strength of the multi-excitation steel wire rope non-destructive testing device of Comparative Example 1 of the present invention;

[0042] Figure 9 This is a simulation diagram of the structure and magnetic field strength of the multi-excitation steel wire rope non-destructive testing device of Comparative Example 2 of the present invention;

[0043] Figure 10 This is a simulation diagram of the structure and magnetic field strength of the multi-excitation steel wire rope non-destructive testing device of Comparative Example 3 of the present invention;

[0044] Figure 11 This is a simulation diagram of the structure and magnetic field strength of the multi-excitation steel wire rope non-destructive testing device of the present invention;

[0045] Figure 12 This is a wire rope magnetization curve diagram of the present invention compared with other devices. Detailed Implementation

[0046] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0047] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0049] See Figure 1-12 As shown, an embodiment of the present invention provides a non-destructive testing device for multi-excitation steel wire ropes, comprising:

[0050] The outer casing is able to slide along the steel wire rope 13;

[0051] A combined excitation unit is installed inside the housing, and the combined excitation unit is used to magnetize the entire wire rope 13;

[0052] A magnetic field line guiding unit 10 is fixed at the middle position inside the housing. The magnetic field line guiding unit 10 is used to guide the interfering magnetic field lines formed between the axially magnetized permanent magnets in the middle of the combined excitation unit to itself.

[0053] A dual-row magnetic flux leakage detection unit is used to detect magnetic flux leakage signals and determine the location of damage to the wire rope 13.

[0054] The aforementioned multi-excitation wire rope non-destructive testing device uses a housing to drive a combined excitation unit, a magnetic field line guiding unit 10, and a double-row leakage magnetic field detection unit to slide along the wire rope 13. The combined excitation unit magnetizes the entire wire rope 13. The magnetic field line guiding unit 10 improves the magnetization effect of the entire device on the wire rope 13 by preventing interference magnetic field lines from flowing into the main magnetic flux loop. Finally, the double-row leakage magnetic field detection unit detects the leakage magnetic field signal and determines the location of the damage to the wire rope 13. It has advantages such as high magnetization intensity, long saturation, simple operation, and convenient maintenance.

[0055] In one embodiment of the present invention, the outer casing includes:

[0056] The upper outer shell 3 has pulleys 1 connected to its left and right sides via connectors 2. The pulleys 1 slide in contact with the wire rope 13. In this embodiment, the pulleys 1 can not only drive the outer shell to move flexibly back and forth on the wire rope 13 to adjust the magnetization position, but also guide the wire rope 13 accurately into the combined excitation unit, reducing the wear of the wire rope 13.

[0057] The lower outer shell 12 cooperates with the upper outer shell 3, and one side of the lower outer shell 12 is connected to one side of the upper outer shell 3 by a hinge 15. In this embodiment, the hinge 15 allows the lower outer shell 12 and the upper outer shell 3 to rotate open or close relative to each other, thereby facilitating the threading of the wire rope 13 through the combined excitation unit, the magnetic field line guiding unit 10, and the double-row leakage magnetic field detection unit.

[0058] In one embodiment of the present invention, a handle 14 is provided on the outer surface of the upper housing 3. This facilitates the movement of the entire detection device along the wire rope 13 by gripping the handle 14.

[0059] like Figure 3 As shown, in one embodiment of the present invention, the combined excitation unit includes:

[0060] The concave armature 7 includes an upper concave armature 71 and a lower concave armature 72 symmetrically arranged, wherein the upper concave armature 71 and the lower concave armature 72 are respectively disposed inside the upper outer shell 3 and the lower outer shell 12.

[0061] The intermediate permanent magnet 9 is fixed inside the concave armature 7, and the intermediate permanent magnet 9 is located on the left and right sides of the magnetic field line guiding unit 10.

[0062] The intermediate permanent magnet 9, the left-end permanent magnet 8, and the right-end permanent magnet 11 are all the same size, optionally with a length of 25mm and a thickness of 27mm. The total volume of the permanent magnets remains approximately constant relative to other existing devices. The left-end permanent magnet 8 and the right-end permanent magnet 11 are magnetized radially, with the magnetic poles of the left-end permanent magnet 8 being N on the outside and S on the inside, and the magnetic poles of the right-end permanent magnet 11 being S on the outside and N on the inside. The intermediate permanent magnet 9 is magnetized axially, with the magnetic poles being N on the left and S on the right.

[0063] The left permanent magnet 8 and the right permanent magnet 11 are both fixed inside the concave armature 7, and the left permanent magnet 8 and the right permanent magnet 11 are located to the left and right of the middle permanent magnet 9, respectively.

[0064] The concave armature 7, the middle permanent magnet 9, the left permanent magnet 8 and the right permanent magnet 11 have through holes 16 distributed on the same straight line inside, and the steel wire rope 13 passes through the through holes 16.

[0065] In this embodiment, the purpose of setting the left-end permanent magnet 8 and the right-end permanent magnet 11 is to ensure that the combined excitation unit can magnetize the wire rope 13 regardless of whether it moves left or right along the wire rope 13, thereby significantly improving the magnetization efficiency. The middle permanent magnet 9 is located between the left-end permanent magnet 8 and the right-end permanent magnet 11. The middle permanent magnet 9 can increase the magnetic flux of the main magnetic flux loop and also leave space for the magnetic field line guiding unit 10.

[0066] In one embodiment of the present invention, the intermediate permanent magnet 9 includes an upper intermediate permanent magnet 91 and a lower intermediate permanent magnet 92 that surround each other, the left permanent magnet 8 includes an upper left permanent magnet 81 and a lower left permanent magnet 82 that surround each other, and the right permanent magnet 11 includes an upper right permanent magnet 111 and a lower right permanent magnet 112 that surround each other.

[0067] The upper middle permanent magnet 91, the upper left permanent magnet 81 and the upper right permanent magnet 111 are fixed inside the upper concave armature 71;

[0068] The lower middle permanent magnet 92, the lower left permanent magnet 82, and the lower right permanent magnet 112 are fixed inside the lower concave armature 72.

[0069] In this embodiment, the middle permanent magnet 9, the left permanent magnet 8, and the right permanent magnet 11 are divided into upper and lower parts, and then respectively cooperate with the upper concave armature 71 and the lower concave armature 72 to realize the overall opening and closing of the entire device, which facilitates the penetration detection of the wire rope 13.

[0070] In one embodiment of the present invention, the left and right end faces of the concave armature 7 are flush with the outer end faces of the left permanent magnet 8 and the right permanent magnet 11, respectively. This increases the contact area between the concave armature 7 and the left and right permanent magnets 8 and 11, thereby improving the fixing effect.

[0071] In one embodiment of the present invention, the contact point between the concave armature 7 and the inner side of the left permanent magnet 8 and the right permanent magnet 11 is an arc surface.

[0072] See Figure 6 As shown, a right-angle contact was simulated. It can be seen that when the concave armature 7 is in right-angle contact with the left-end permanent magnet 8 and the right-end permanent magnet 11, some magnetic field lines will be scattered in the air, which is not conducive to the conduction of magnetic field lines. See [reference needed]. Figure 7 As shown, the simulation uses rounded corners for transition, and the magnetic field lines at the contact points between the concave armature 7 and the left permanent magnet 8 and the right permanent magnet 11 are evenly distributed, which effectively reduces the leakage magnetic field phenomenon in the main magnetic flux loop.

[0073] In one embodiment of the present invention, the magnetic field line guiding unit 10 includes a hollow ring made of soft magnetic material. The hollow ring is fixedly installed inside the concave armature 7 and placed between the intermediate permanent magnets 9. The steel wire rope 13 is threaded through the hollow ring.

[0074] In this embodiment, the magnetic field line guiding unit 10 is configured as a hollow ring of soft magnetic material with a certain thickness, which facilitates the subsequent installation of detection elements. The magnetic field simulation after the magnetic field line guiding unit 10 is as follows: Figure 5As shown, it can be seen that the magnetic field lines in the concave armature 7 are opposite in direction to the magnetic field lines in the magnetic field line guiding unit 10. The magnetic field line guiding unit 10 guides the magnetic field lines formed between the intermediate permanent magnets 9 to the device itself, preventing them from flowing into the main magnetic flux circuit, thereby enhancing the excitation effect of the device.

[0075] In one embodiment of the present invention, the dual-row magnetic flux leakage detection unit includes:

[0076] Circuit board 6 is fixed inside the magnetic field line guiding unit 10;

[0077] Multiple Hall elements 4 are arranged in a detection ring and fixed on the circuit board 6, and the steel wire rope 13 is threaded through the detection ring.

[0078] In this embodiment, as Figure 4 As shown, due to the limited detection range of the detection element, to avoid missing leakage magnetic signals, multiple Hall magnetic elements 4 are arranged in a detection ring along the axial direction of the wire rope 13. Specifically, twelve Hall elements 4 are installed on each circuit board 6, and each row consists of twelve Hall elements 4 evenly distributed around the circumference of the wire rope 13 to form a detection ring, thus avoiding lateral vibration and interference signals during the magnetization process.

[0079] In one embodiment of the present invention, the circuit board 6 is arranged in two rows, and the circuit board 6 is fixed inside the magnetic field line guiding unit 10 by a fixing bracket 5.

[0080] The working principle of this invention is as follows:

[0081] In use, pulley 1 is engaged with wire rope 13, and the device is moved. The combined excitation unit magnetizes the entire wire rope 13. After the wire rope 13 is saturated with magnetization, if a defect occurs in the wire rope 13, the magnetic field lines will be dispersed in the air through the defect because the inside of the wire rope 13 is already saturated. At this time, the Hall magnetic element 4 around the wire rope 13 will detect the leakage magnetic signal, and the circuit board 6 will convert the magnetic signal into an electrical signal and transmit it to an external computer for further processing.

[0082] Comparative Example 1

[0083] A non-destructive testing device for steel wire ropes, with a simplified structural diagram and the magnetization effect of the steel wire rope as shown below. Figure 8 As shown, the difference lies in the use of only two radial permanent magnets with opposite magnetization directions on the left and right sides, and the armature structure is not optimized. Simulation results for this device show a maximum magnetic induction intensity of 2.121T for the wire rope and a saturation length of approximately 70mm. The magnetization curve of the wire rope is compared as follows... Figure 12 Comparative Example 1 shows the lowest magnetic induction intensity.

[0084] Comparative Example 2

[0085] A non-destructive testing device for steel wire ropes, with a simplified structural diagram and the magnetization effect of the steel wire rope as shown below. Figure 9 As shown, the difference is that by using a radial splicing method, the fan-shaped permanent magnets form the left and right end ring permanent magnets, thereby increasing the length of the magnetization saturation region of the wire rope. The maximum magnetic induction intensity is 2.204T and the saturation length is 77mm. Comparative Example 2 has improved both the maximum magnetic induction intensity and the saturation length compared to Example 1.

[0086] Comparative Example 3

[0087] A non-destructive testing device for steel wire ropes, with a simplified structural diagram and the magnetization effect of the steel wire rope as shown below. Figure 10 As shown, the difference is that only two radially magnetized permanent magnets with opposite magnetization directions are used. A magnetic circuit shielding device is used between the permanent magnets. The maximum magnetization intensity of Comparative Example 3 is 2.184T and the saturation length is 68mm. The maximum magnetic induction intensity of Comparative Example 1 is improved, while the saturation length remains approximately unchanged.

[0088] like Figure 11 The diagram shown is a simplified structural diagram of this device and a graph illustrating the magnetization effect of the wire rope. The magnetization curves of the wire rope in the aforementioned testing devices are compared. Figure 12 The magnetization intensity of this device at 70mm is 2.061T, which is still greater than the minimum saturation magnetic induction intensity of 1.8T for the wire rope. The maximum magnetization intensity is 2.312T, and the saturation length of the wire rope is 84mm. Comparing the wire rope magnetization curves of several devices, this device has the highest maximum magnetization intensity and the longest saturation length.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above merely illustrate several implementations of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A non-destructive testing device for multi-excitation steel wire rope, characterized in that, include: The outer casing is able to slide along the steel wire rope (13); A combined excitation unit is installed inside the housing, and the combined excitation unit is used to magnetize the entire wire rope (13); A magnetic field line guiding unit (10) is fixed at the middle position inside the housing. The magnetic field line guiding unit (10) is used to guide the interfering magnetic field lines formed between the axially magnetized permanent magnets in the middle of the combined excitation unit to itself. A dual-row magnetic flux leakage detection unit is used to detect magnetic flux leakage signals and determine the location of the breakage of the wire rope (13); The outer casing includes: The upper outer shell (3) has pulleys (1) connected to its left and right sides via connectors (2), and the pulleys (1) slide in contact with the wire rope (13); The lower outer shell (12) cooperates with the upper outer shell (3), and one side of the lower outer shell (12) is connected to one side of the upper outer shell (3) by a hinge (15); The combined excitation unit includes: The concave armature (7) includes an upper concave armature (71) and a lower concave armature (72) symmetrically arranged, wherein the upper concave armature (71) and the lower concave armature (72) are respectively disposed inside the upper outer shell (3) and the lower outer shell (12); The intermediate permanent magnet (9) is fixed inside the concave armature (7), and the intermediate permanent magnet (9) is located on the left and right sides of the magnetic field line guiding unit (10); The left permanent magnet (8) and the right permanent magnet (11) are both fixed inside the concave armature (7), and the left permanent magnet (8) and the right permanent magnet (11) are located on the left and right sides of the middle permanent magnet (9), respectively. The middle permanent magnet (9), the left permanent magnet (8), and the right permanent magnet (11) are the same size. The left permanent magnet (8) and the right permanent magnet (11) are magnetized radially. The magnetic poles of the left permanent magnet (8) are N on the outside and S on the inside, and the magnetic poles of the right permanent magnet (11) are S on the outside and N on the inside. The middle permanent magnet (9) is magnetized axially. The magnetic poles are N on the left and S on the right. The concave armature (7), the middle permanent magnet (9), the left permanent magnet (8) and the right permanent magnet (11) have through holes (16) distributed on the same straight line inside, and the steel wire rope (13) passes through the through holes (16). The magnetic field line guiding unit (10) includes a hollow ring made of soft magnetic material. The hollow ring is fixedly installed inside the concave armature (7) and placed between the intermediate permanent magnets (9). The steel wire rope (13) is threaded through the hollow ring.

2. The non-destructive testing device for multi-excitation steel wire rope as described in claim 1, characterized in that, The outer surface of the upper housing (3) is provided with a handle (14).

3. The non-destructive testing device for multi-excitation steel wire rope as described in claim 2, characterized in that, The intermediate permanent magnet (9) includes an upper intermediate permanent magnet (91) and a lower intermediate permanent magnet (92) that surround each other; the left permanent magnet (8) includes an upper left permanent magnet (81) and a lower left permanent magnet (82) that surround each other; and the right permanent magnet (11) includes an upper right permanent magnet (111) and a lower right permanent magnet (112) that surround each other. The upper middle permanent magnet (91), the upper left permanent magnet (81) and the upper right permanent magnet (111) are fixed inside the upper concave armature (71); The lower middle permanent magnet (92), the lower left permanent magnet (82), and the lower right permanent magnet (112) are fixed inside the lower concave armature (72).

4. The non-destructive testing device for multi-excitation steel wire rope as described in claim 3, characterized in that, The left and right end faces of the concave armature (7) are flush with the outer end faces of the left permanent magnet (8) and the right permanent magnet (11), respectively.

5. The non-destructive testing device for multi-excitation steel wire rope as described in claim 4, characterized in that, The concave armature (7) has a circular arc surface at the contact point with the inner side of the left permanent magnet (8) and the right permanent magnet (11).

6. The non-destructive testing device for multi-excitation steel wire rope as described in claim 1, characterized in that, The dual-row magnetic flux leakage detection unit includes: The circuit board (6) is fixed inside the magnetic field line guiding unit (10); Multiple Hall elements (4) are arranged in a detection ring and fixed on the circuit board (6), and the steel wire rope (13) is threaded through the detection ring.

7. The non-destructive testing device for multi-excitation steel wire rope as described in claim 6, characterized in that, The circuit board (6) is arranged in two rows, and the circuit board (6) is fixed inside the magnetic field line guiding unit (10) by a fixing bracket (5).

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