Steel wire rope eddy current nondestructive inspection system and method

Abstract

The invention discloses a steel wire rope eddy current nondestructive inspection system and method. The method comprises the following steps that a steel wire rope is pulled to move in a clamping mode; in the moving process of the steel wire rope, the steel wire rope passes through the forward protruding deformation channel and the reverse protruding deformation channel of the detection sleeve, so that different side faces of the steel wire rope are physically bent; the same alternating magnetic fields are generated around the forward protruding deformation channel and the reverse protruding deformation channel respectively, so that the steel wire rope induces an alternating eddy current field; the detection voltage signal of the steel wire rope at the axial position is captured in real time, the detected voltage signal is processed and compared with the detected voltage signals of the defect-free steel wire rope in the forward bending state and the reverse bending state, and whether the steel wire rope has defects or not is judged. Therefore, the defects of the steel wire rope can be amplified by changing the physical structure of the steel wire rope in different directions, the eddy current nondestructive inspection quality of the steel wire rope can be greatly improved, and the reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of eddy current nondestructive flaw detection, and in particular to a system and method for eddy current nondestructive flaw detection of a steel wire rope. Background Art

[0002] As an important mechanical transmission component, wire rope is widely used in mechanical equipment such as lifting and traction. However, due to long-term use and the influence of external environmental factors, wire ropes may have problems such as wire breakage, wear, and rust. If these problems cannot be discovered and solved in time, they will bring great hidden dangers to the safety of wire rope use.

[0003] Among them, eddy current nondestructive testing technology can be used to detect various conductive materials including wire ropes, and there are no strict requirements on the conductive properties of the materials. It can detect various internal and external defects of wire ropes. Specifically, when the wire rope is located in a changing magnetic field, according to Faraday's law of magnetic induction, a current similar to a vortex of water will be induced inside the wire rope. The induced current is called eddy current because of its vortex-like flow mode. This physical phenomenon is the eddy current effect. When the wire rope has no defects, the eddy current is ring-shaped, and when the wire rope has defects, the impedance at the defect is significantly higher than the impedance of the wire rope itself. Therefore, the eddy current propagating to the location of the defect changes its original propagation path and detours. The distribution of the induced current and magnetic field in the wire rope changes accordingly. Therefore, the defects in the wire rope can be discovered by analyzing these changes.

[0004] In the actual detection process of eddy current non-destructive testing, on the one hand, it is limited by the influence of the intensity of the eddy current field, so that the difference of the voltage signal of the captured wire rope to be tested is not obvious enough. On the other hand, for some defects of the wire rope itself, such as broken wires, wear, rust, etc., when the defect size range is extremely small, the difference in the detected voltage signal will also be unclear. Especially in the special case where these two factors overlap, it will significantly affect the detection quality of eddy current non-destructive testing. Summary of the invention

[0005] The embodiment of the present application provides a system and method for eddy current nondestructive flaw detection of wire ropes, which can change the physical structure of the wire rope during eddy current nondestructive flaw detection and amplify the defects of the wire rope in multiple directions, which can effectively improve the detection quality of eddy current nondestructive flaw detection and greatly reduce the probability of false detection and missed detection.

[0006] A first aspect of an embodiment of the present application provides a method for nondestructive flaw detection of a steel wire rope by eddy current, comprising the following steps:

[0007] The wire rope is pulled and moved by clamping;

[0008] During the movement of the steel wire rope, the steel wire rope is passed through at least one detection sleeve, wherein the detection sleeve has at least one positive convex deformation channel and at least one reverse convex deformation channel which are spaced apart, so that the steel wire rope can generate at least one positive bending form and at least one reverse bending form when moving through the detection sleeve, wherein the deformation directions of the positive bending form and the reverse bending form are staggered in the radial plane of the detection sleeve;

[0009] Generating the same alternating magnetic field around the forward convex deformation channel and the reverse convex deformation channel respectively, so as to induce an alternating eddy current field when the wire rope passes through the forward convex deformation channel and the reverse convex deformation channel;

[0010] The detected voltage signal of the steel wire rope in the axial position in the forward bending form and the reverse bending form is captured in real time, the detected voltage signal is processed and compared with the detected voltage signal of the defect-free steel wire rope in the forward bending form and the reverse bending form to determine whether the steel wire rope has defects.

[0011] In a possible implementation, during the movement of the wire rope, the wire rope passes through a detection sleeve, the detection sleeve has a positive convex deformation channel and a reverse convex deformation channel, and the deformation directions of the positive convex deformation channel and the reverse convex deformation channel are opposite.

[0012] In a possible implementation, during the movement of the wire rope, the wire rope passes through a detection sleeve, and the detection sleeve has two positive convex deformation channels and two reverse convex deformation channels, wherein the positive convex deformation channels and the reverse convex deformation channels are distributed in sequence at intervals, and the positions of the two positive convex deformation channels and the two reverse convex deformation channels are distributed in a cross shape in the radial plane of the detection sleeve.

[0013] In a possible implementation, during the movement of the wire rope, the wire rope passes through the two detection sleeves in sequence, wherein the detection sleeve has a positive convex deformation channel and a reverse convex deformation channel, and the positions of the positive convex deformation channel and the reverse convex deformation channel in the two detection sleeves are distributed in a cross shape in the radial plane of the detection sleeve.

[0014] In a possible implementation, the distance between the center points of the adjacent positive bending forms and the negative bending forms is 3.7-4.5 times the outer diameter of the steel wire rope.

[0015] A second aspect of the embodiment of the present application provides a wire rope eddy current nondestructive flaw detection system, comprising a clamping and traction unit, a deformation limiting unit and a detection unit, wherein the clamping and traction unit is used to pull the wire rope in a clamping manner for directional movement;

[0016] The deformation limiting unit comprises a detection sleeve, the detection sleeve has at least one positive convex deformation channel and at least one reverse convex deformation channel, so that the steel wire rope can generate at least one positive bending form and at least one reverse bending form when it moves in a directional manner in the detection sleeve, wherein the deformation directions of the positive convex deformation channel and the reverse convex deformation channel are staggered in the radial plane of the detection sleeve, and the detection sleeve is embedded with an anti-interference limiting isolation structure in the inner ring facing the positive convex deformation channel and the reverse convex deformation channel, which is used to limit and isolate the steel wire rope, so that the steel wire rope can maintain the same spacing with the side wall of the detection sleeve when passing through the anti-interference limiting isolation structure;

[0017] The detection unit includes an excitation coil and a detection coil axially arranged in the positive convex deformation channel and the reverse convex deformation channel, and the excitation coil and the detection coil are distributed in sequence in the circumferential direction of the detection sleeve. The excitation coil is used to induce an alternating eddy current field in the passing steel wire rope, and the detection coil is used to capture the detection voltage signal of the steel wire rope at the axial position in real time.

[0018] In a possible implementation, the detection sleeve has one positive convex deformation channel and one negative convex deformation channel, and the deformation directions of the positive convex deformation channel and the negative convex deformation channel are opposite.

[0019] In a possible implementation, the detection sleeve has two positive convex deformation channels and two reverse convex deformation channels, wherein the positive convex deformation channels and the reverse convex deformation channels are distributed in sequence at intervals, and the positions of the two positive convex deformation channels and the two reverse convex deformation channels are distributed in a cross shape in the radial plane of the detection sleeve.

[0020] In a possible implementation, the distance between the center points of the adjacent positive convex deformation channel and the negative convex deformation channel is 3.7-4.5 times the outer diameter of the steel wire rope.

[0021] In a possible implementation, the anti-interference limiting isolation structure is distributed in the positive convex deformation channel and the reverse convex deformation channel, and is a cylindrical structure, or is composed of a plurality of isolation blocks evenly distributed in the circumference of the detection sleeve, wherein the inner side surface of the isolation block is arc-shaped and matches the outer ring of the wire rope;

[0022] A plurality of limit wheels are respectively installed in the detection sleeve near the positive convex deformation channel and the reverse convex deformation channel. The limit wheels located in the same radial plane of the detection sleeve are evenly distributed along the circumference of the detection sleeve, and the distance that the limit wheels protrude from the inner wall of the detection sleeve is less than the distance that the anti-interference limit isolation structure protrudes from the inner wall of the detection sleeve.

[0023] Beneficial effects: Compared with the prior art, the wire rope eddy current nondestructive flaw detection system and method provided by the present application can magnify the defects of the wire rope in the positive bending state and the reverse bending state respectively by changing the physical structure during the detection process, rather than magnifying the defects in the form of an algorithm, and the detection reliability is higher. The deformation directions of the positive bending state and the reverse bending state are staggered in the radial plane of the detection sleeve, which can magnify the defects of the wire rope at different circumferential positions, thereby further improving the quality of eddy current nondestructive flaw detection;

[0024] Among them, the wire rope is moved in a clamping and traction manner, which can reduce the rotation amount of the wire rope during the movement process. In addition, the distance between the center points of adjacent positive bending forms and reverse bending forms, or the distance between the center points of adjacent positive convex deformation channels and reverse convex deformation channels is 3.7-4.5 times the outer diameter of the wire rope, which can further reduce the rotation offset that may exist in the wire rope during the movement, thereby reducing the impact on the detection position of the wire rope surface, so that the positive bending form and the reverse bending form of the wire rope are basically located at different positions of the wire rope circumference, thereby further ensuring the quality of eddy current non-destructive testing;

[0025] The anti-interference limiting isolation structure can ensure the normal detection of eddy current non-destructive testing, and the moving direction of the wire rope can be pre-adjusted in the detection sleeve through the limiting wheel to ensure that the wire rope smoothly enters the positive convex deformation channel and the reverse convex deformation channel, and is not easy to damage the wire rope. At the same time, the friction resistance to the wire rope is small, and it is not easy to affect the high-speed movement of the wire rope.

[0026] These and other objects, features and advantages of the present invention will be fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic flow chart of the wire rope eddy current nondestructive flaw detection method of the present application is shown.

[0028] Figure 2 The schematic diagram of the structure of the wire rope eddy current nondestructive flaw detection system of the present application is shown.

[0029] Figure 3 A schematic cross-sectional structure diagram of the detection sleeve of the present application is shown.

[0030] Figure 4 A schematic structural diagram showing that the positive convex deformation channel and the reverse convex deformation channel are distributed in a cross shape in the present application is shown.

[0031] Figure 5 A schematic cross-sectional structure diagram of the detection sleeve of the present application is shown. DETAILED DESCRIPTION

[0032] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0033] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0034] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0035] refer to Figures 1 to 4 According to a first aspect of an embodiment of the present application, there is provided a method for nondestructive flaw detection of a steel wire rope by eddy current, comprising the following steps:

[0036] The wire rope is pulled and moved in a clamping manner, so that the rotation deviation of the wire rope can be minimized during the movement of the wire rope;

[0037] During the movement of the wire rope, the wire rope is made to pass through at least one detection sleeve 10, wherein the detection sleeve 10 has at least one positive convex deformation channel 101 and at least one reverse convex deformation channel 102 that are spaced apart, so that the wire rope can generate at least one positive bending form and at least one reverse bending form correspondingly when it moves through the detection sleeve 10, wherein the deformation directions of the positive bending form and the reverse bending form are staggered in the radial plane of the detection sleeve 10, so as to ensure as much as possible that when the wire rope moves through the positive convex deformation channel 101 and the reverse convex deformation channel 102, different points on the circumferential surface of the wire rope can bulge outward, thereby amplifying the physical structure of the position to a certain extent;

[0038] The same alternating magnetic field is generated around the positive convex deformation channel 101 and the reverse convex deformation channel 102 respectively, so that an alternating eddy current field can be induced when the wire rope passes through the positive convex deformation channel 101 and the reverse convex deformation channel 102;

[0039] The detected voltage signal of the steel wire rope in the axial position in the forward bending form and the reverse bending form is captured in real time, the detected voltage signal is processed and compared with the detected voltage signal of the defect-free steel wire rope in the forward bending form and the reverse bending form to determine whether the steel wire rope has defects.

[0040] Therefore, the wire rope eddy current nondestructive flaw detection method provided by the present application can, on the one hand, magnify the defects of the wire rope to a certain extent in the form of a physical structure. The closer to the surface, the higher the magnification. In addition, the magnification is also positively correlated with the bending curvature of the positive convex deformation channel 101 and the reverse convex deformation channel 102 (or the deformation rate of the positive bending shape and the reverse bending shape). The greater the bending curvature, the greater the defect magnification. However, the wire rope will not be damaged or destroyed due to the detection. On the other hand, during the movement of the wire rope, the positive bending The deformation directions of the curved form and the reverse curved form are staggered in the radial plane of the detection sleeve 10, or the positive convex deformation channel 101 and the reverse convex deformation channel 102 are staggered in the radial plane of the detection sleeve 10, which will cause the wire rope to bend at different circumferential surface positions when passing through the positive convex deformation channel 101 and the reverse convex deformation channel 102, and then different positions can be magnified by changing the physical structure during the movement of the wire rope, thereby comprehensively improving the eddy current non-destructive testing quality of the wire rope.

[0041] Theoretically, as the number of the positive convex deformation channels 101 and the reverse convex deformation channels 102 of the offset distribution increases, more points of changing the physical structure will occur, thereby basically covering the entire surface of the wire rope during its movement.

[0042] The wire rope can be pulled and moved in a clamping manner by means of a winch 20, an endless conveyor belt 30 and a plurality of automatic clamps 40, wherein the winch 20 normally reels the wire rope, and the endless conveyor belt 30 is arranged between the winch 20 and the detection sleeve 10, and a plurality of automatic clamps 40 are arranged on the endless conveyor belt 30 at intervals. In the process of the winch 10 reeling in the wire rope, the endless conveyor belt 30 is driven to rotate in the same direction and at the same speed by the servo motor and the rotating wheel, and the upper rotating layer 31 of the endless conveyor belt 30 is close to the wire rope. At the same time, proximity sensors are placed at the head end and the tail end of the brackets on both sides of the upper rotating layer 31, and the clamping mouth of the automatic clamp 40 is directly opposite to the wire rope and is distributed on the wire rope. On both sides of the wire rope, when the automatic clamp 40 is driven to move to the upper rotating layer 31 and approaches the proximity sensor at the head end, the automatic clamp 40 automatically clamps the wire rope and moves with the circulating conveyor belt 30 in the same direction as the winding speed of the winch 20. When the automatic clamp 40 approaches the proximity sensor at the tail end, the wire rope is automatically loosened. In this way, the automatic clamp 40 can maintain the clamping of the wire rope between the head end proximity sensor and the tail end proximity sensor. At the same time, the distance between two adjacent automatic clamps 40 is smaller than the distance between the head end proximity sensor and the tail end proximity sensor. In this way, the clamping of the wire rope can be achieved in the entire detection process, and then the clamping and transportation of the wire rope can be achieved.

[0043] In one embodiment, during the movement of the wire rope, the wire rope passes through a detection sleeve 10, and the detection sleeve 10 has a positive convex deformation channel 101 and a reverse convex deformation channel 102, and the deformation directions of the positive convex deformation channel 101 and the reverse convex deformation channel 102 are opposite, thereby being able to physically bend the two completely opposite surfaces of the wire rope to magnify the defects of the two surfaces.

[0044] In the second embodiment, during the movement of the wire rope, the wire rope passes through a detection sleeve 10, and the detection sleeve 10 has two positive convex deformation channels 101 and two reverse convex deformation channels 102, wherein the positive convex deformation channels 101 and the reverse convex deformation channels 102 are distributed in sequence, and the positions of the two positive convex deformation channels 101 and the two reverse convex deformation channels 102 are distributed in a cross shape in the radial plane of the detection sleeve 10, that is, the two positive convex deformation channels 101 and the two reverse convex deformation channels 102 are distributed in sequence along the axial direction of the detection sleeve 10, that is, positive-negative-positive-negative, (such as Figure 4 ) At the same time, they are distributed in a cross shape in a radial direction perpendicular to the axial direction. Since the wire rope is continuously moving in the detection sleeve 10, the defects on the four opposite surfaces of the wire rope can be magnified at the same time.

[0045] In the third embodiment, during the movement of the wire rope, the wire rope passes through the two detection sleeves 10 in sequence, wherein the detection sleeve 10 has a positive convex deformation channel 101 and a reverse convex deformation channel 102, and the positions of the positive convex deformation channel 101 and the reverse convex deformation channel 102 in the two detection sleeves 10 are distributed in a cross shape on the radial plane of the detection sleeve 10. This situation is similar to the second embodiment, except that the two positive convex deformation channels 101 and the two reverse convex deformation channels 102 are separately arranged in the two detection sleeves 10, which can achieve basically the same effect.

[0046] Considering that the axial rotation offset of the wire rope may still occur when the wire rope is simply pulled by the winch 20 or pulled and moved by clamping, in the case of axial rotation offset, if the positive convex deformation channel 101 and the reverse convex deformation channel 102 are far apart, theoretically, there will be a situation where the defect magnification position overlaps, which is not conducive to the full inspection of the wire rope. Therefore, the distance between the center points of the adjacent positive bending form and the reverse bending form (or the positive convex deformation channel and the reverse convex deformation channel) is 3.7-4.5 times the outer diameter of the wire rope. In this way, on the one hand, the wire rope will not bend frequently within a shorter moving distance, which can ensure the inherent quality of the wire rope. On the other hand, the distance between the positive convex deformation channel 101 and the reverse convex deformation channel 102 can be constrained based on the moving distance of the wire rope to ensure that the defect magnification position of the wire rope is at different positions as much as possible, thereby enabling defect magnification detection of different surface positions of the wire rope to achieve higher detection quality.

[0047] Based on the same working principle, combined Figures 2 to 5 , the second aspect of the embodiment of the present application further provides a wire rope eddy current nondestructive flaw detection system, comprising a clamping and traction unit, a deformation limiting unit and a detection unit, wherein the clamping and traction unit is used to traction the wire rope in a clamping manner to move in a directional manner;

[0048] The deformation limiting unit comprises a detection sleeve 10, and the detection sleeve 10 has at least one positive convex deformation channel 101 and at least one reverse convex deformation channel 102, so that the steel wire rope can generate at least one positive bending form and at least one reverse bending form when it moves in a directional manner in the detection sleeve 10, wherein the deformation directions of the positive convex deformation channel 101 and the reverse convex deformation channel 102 are staggered in the radial plane of the detection sleeve 10, and the detection sleeve 10 is embedded with an anti-interference limiting isolation structure 11 in the inner ring facing the positive convex deformation channel 101 and the reverse convex deformation channel 102, which is used to limit and isolate the steel wire rope, so that the steel wire rope can maintain the same spacing with the side wall of the detection sleeve 10 when passing through the anti-interference limiting isolation structure 11;

[0049] The detection unit includes an excitation coil 12 and a detection coil 13 arranged axially in the forward convex deformation channel 101 and the reverse convex deformation channel 102, and the excitation coil 12 and the detection coil 13 are sequentially spaced and distributed in the circumferential direction of the detection sleeve 10, wherein the excitation coil 12 is used to induce an alternating eddy current field in the passing steel wire rope, and the detection coil 13 is used to capture the detection voltage signal of the steel wire rope in the axial position in real time. The distribution mode of the excitation coil 12 and the detection coil 13 can refer to Chinese patent CN108333253A, an array eddy current probe and detection method for detecting broken wire defects in steel wire ropes, and in addition, the processing of the detection voltage signal is also a conventional technical means.

[0050] The clamping and traction unit includes a winch 20, a circulating conveyor belt 30 and a plurality of automatic clamps 40, wherein the winch 20 is used for traction and winding of the steel wire rope to be inspected, wherein the circulating conveyor belt 30 is arranged between the winch 20 and the inspection sleeve 10, and the plurality of automatic clamps 40 are arranged on the circulating conveyor belt 30 at intervals. During the winding process of the winch 20, the servo motor cooperates with the rotating wheel to drive the circulating conveyor belt 30 to rotate in the same direction and at the same speed. The upper rotating layer 31 of the circulating conveyor belt 30 is close to the wire rope. At the same time, proximity sensors are placed at the head end and the tail end of the brackets on both sides of the upper rotating layer 31. The clamping mouth of the automatic clamp 40 is opposite to the wire rope and is distributed on both sides of the wire rope. When the automatic clamp 40 is driven to move to the position of the upper rotating layer 31 and close to the proximity sensor at the head end, the automatic clamp 40 automatically clamps the wire rope and moves in the same direction as the winding speed of the winch 20 with the circulating conveyor belt 30. When the automatic clamp 40 approaches the proximity sensor at the tail end, the wire rope is automatically released. Therefore, the wire rope can be clamped between the head end proximity sensor and the tail end proximity sensor by the automatic clamp 40. At the same time, the distance between two adjacent automatic clamps 40 is less than the distance between the head end proximity sensor and the tail end proximity sensor. In this way, the wire rope can be clamped in the entire detection process, thereby realizing the clamping and conveying of the wire rope.

[0051] The anti-interference limiting isolation structure 11 is distributed in the positive convex deformation channel 101 and the reverse convex deformation channel 102, and mainly plays the role of limiting the wire rope, so that the wire rope passes through the center position of the positive convex deformation channel 101 and the reverse convex deformation channel 102, and has a certain gap between it and the detection sleeve 10, while not interfering with the eddy current non-destructive testing of the wire rope. For example, a relatively thin tubular structure can be made of organic glass material with extremely low electrical conductivity, or it can be composed of a plurality of isolation blocks evenly distributed around the circumference of the detection sleeve 10, wherein the inner side surface of the isolation block is arc-shaped and cooperates with the outer ring of the wire rope.

[0052] In addition, in order to further reduce the influence of the anti-interference limiting isolation structure 11 on eddy current non-destructive testing, there can be a larger gap between the circumferentially evenly distributed isolation blocks of the detection sleeve 10, and the excitation coil 12 and the detection coil 13 are distributed in these gaps at intervals, so that the influence of the anti-interference limiting isolation structure on eddy current non-destructive testing can be basically ignored.

[0053] In one embodiment, the detection sleeve 10 has a positive convex deformation channel 101 and a reverse convex deformation channel 102, and the deformation directions of the positive convex deformation channel 101 and the reverse convex deformation channel 102 are opposite, thereby being able to perform physical bending on two completely opposite surfaces of the wire rope to magnify the defects of the two surfaces.

[0054] In one embodiment, the detection sleeve 10 has two positive convex deformation channels 101 and two reverse convex deformation channels 102, wherein the positive convex deformation channels 101 and the reverse convex deformation channels 102 are spaced apart in sequence, and the positions of the two positive convex deformation channels 101 and the two reverse convex deformation channels 102 are cross-shaped in the radial plane of the detection sleeve 10, thereby being able to simultaneously magnify the defects of the four opposite surfaces of the wire rope.

[0055] In one embodiment, the distance between the center points of the adjacent positive convex deformation channel 101 and the negative convex deformation channel 102 is 3.7-4.5 times the outer diameter of the wire rope. The benefits of this have been described above and will not be repeated here.

[0056] In one embodiment, a plurality of limit wheels 14 are respectively installed in the detection sleeve 10 near the positive convex deformation channel 101 and the reverse convex deformation channel 102, and the limit wheels 14 located in the same radial plane of the detection sleeve 10 (a plane perpendicular to the axial direction of the detection sleeve) are evenly distributed along the circumference of the detection sleeve 10, and the distance by which the limit wheel 14 protrudes from the inner wall of the detection sleeve 10 is less than the distance by which the anti-interference limit isolation structure 11 protrudes from the inner wall of the detection sleeve 10. In this way, the position of the wire rope in the detection sleeve 10 can be pre-adjusted by the circumferential rotation limit of the limit wheel 14, so that the wire rope can move along a position basically close to or located at the center of the detection sleeve 10, thereby ensuring that the wire rope enters the positive convex deformation channel 101 and the reverse convex deformation channel 102 more smoothly, and at the same time, it is not easy to damage the wire rope. In addition, the rotation limit method has a small contact area and a small friction resistance, and is not easy to affect the high-speed movement of the wire rope, thereby ensuring the detection efficiency.

[0057] It should be noted that the terms "first, second and third" in the present application are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0058] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A wire rope eddy current nondestructive flaw detection method, characterized in that: The following steps are involved: The wire rope is pulled and moved by clamping; During the movement of the steel wire rope, the steel wire rope is passed through at least one detection sleeve, wherein the detection sleeve has at least one positive convex deformation channel and at least one reverse convex deformation channel which are spaced apart, so that the steel wire rope can generate at least one positive bending form and at least one reverse bending form when moving through the detection sleeve, wherein the deformation directions of the positive bending form and the reverse bending form are staggered in the radial plane of the detection sleeve; Generating the same alternating magnetic field around the forward convex deformation channel and the reverse convex deformation channel respectively, so as to induce an alternating eddy current field when the wire rope passes through the forward convex deformation channel and the reverse convex deformation channel; The detected voltage signal of the steel wire rope in the axial position in the forward bending form and the reverse bending form is captured in real time, the detected voltage signal is processed and compared with the detected voltage signal of the defect-free steel wire rope in the forward bending form and the reverse bending form to determine whether the steel wire rope has defects.

2. The wire rope eddy current nondestructive flaw detection method according to claim 1, characterized in that: During the movement of the wire rope, the wire rope passes through a detection sleeve, which has a positive convex deformation channel and a reverse convex deformation channel, and the deformation directions of the positive convex deformation channel and the reverse convex deformation channel are opposite.

3. The wire rope eddy current nondestructive flaw detection method according to claim 1, characterized in that: During the movement of the wire rope, the wire rope passes through a detection sleeve, which has two positive convex deformation channels and two reverse convex deformation channels, wherein the positive convex deformation channels and the reverse convex deformation channels are distributed in sequence at intervals, and the positions of the two positive convex deformation channels and the two reverse convex deformation channels are distributed in a cross shape in the radial plane of the detection sleeve.

4. The wire rope eddy current nondestructive flaw detection method according to claim 1, characterized in that: During the movement of the wire rope, the wire rope passes through the two detection sleeves in sequence, wherein the detection sleeve has a positive convex deformation channel and a reverse convex deformation channel, and the positions of the positive convex deformation channel and the reverse convex deformation channel in the two detection sleeves are distributed in a cross shape on the radial plane of the detection sleeve.

5. The wire rope eddy current nondestructive flaw detection method according to any one of claims 2 to 4, characterized in that: The distance between the center points of the adjacent positive bending forms and the reverse bending forms is 3.7-4.5 times the outer diameter of the wire rope.

6. Wire rope eddy current nondestructive flaw detection system, characterized in that: It includes a clamping and pulling unit, a deformation limiting unit and a detection unit, wherein the clamping and pulling unit is used to pull the steel wire rope in a clamping manner for directional movement; The deformation limiting unit comprises a detection sleeve, the detection sleeve has at least one positive convex deformation channel and at least one reverse convex deformation channel, so that the steel wire rope can generate at least one positive bending form and at least one reverse bending form when it moves in a directional manner in the detection sleeve, wherein the deformation directions of the positive convex deformation channel and the reverse convex deformation channel are staggered in the radial plane of the detection sleeve, and the detection sleeve is embedded with an anti-interference limiting isolation structure in the inner ring facing the positive convex deformation channel and the reverse convex deformation channel, which is used to limit and isolate the steel wire rope, so that the steel wire rope can maintain the same spacing with the side wall of the detection sleeve when passing through the anti-interference limiting isolation structure; The detection unit includes an excitation coil and a detection coil axially arranged in the positive convex deformation channel and the reverse convex deformation channel, and the excitation coil and the detection coil are distributed in sequence in the circumferential direction of the detection sleeve. The excitation coil is used to induce an alternating eddy current field in the passing steel wire rope, and the detection coil is used to capture the detection voltage signal of the steel wire rope at the axial position in real time.

7. The wire rope eddy current nondestructive flaw detection system according to claim 6, characterized in that: The detection sleeve has a positive convex deformation channel and a negative convex deformation channel, and the deformation directions of the positive convex deformation channel and the negative convex deformation channel are opposite.

8. The wire rope eddy current nondestructive flaw detection system according to claim 6, characterized in that: The detection sleeve has two positive convex deformation channels and two reverse convex deformation channels, wherein the positive convex deformation channels and the reverse convex deformation channels are distributed in sequence and spaced apart, and the positions of the two positive convex deformation channels and the two reverse convex deformation channels are distributed in a cross shape on the radial plane of the detection sleeve.

9. The wire rope eddy current nondestructive flaw detection system according to claim 7 or 8, characterized in that: The distance between the center points of the adjacent positive convex deformation channels and the negative convex deformation channels is 3.7-4.5 times the outer diameter of the steel wire rope.

10. The wire rope eddy current nondestructive flaw detection system according to claim 6, characterized in that: The anti-interference limiting isolation structure is distributed in the positive convex deformation channel and the reverse convex deformation channel, and is a cylindrical structure, or is composed of a plurality of isolation blocks evenly distributed in the circumference of the detection sleeve, wherein the inner side surface of the isolation block is arc-shaped and matches with the outer ring of the wire rope; A plurality of limit wheels are respectively installed in the detection sleeve near the positive convex deformation channel and the reverse convex deformation channel. The limit wheels located in the same radial plane of the detection sleeve are evenly distributed along the circumference of the detection sleeve, and the distance that the limit wheels protrude from the inner wall of the detection sleeve is less than the distance that the anti-interference limit isolation structure protrudes from the inner wall of the detection sleeve.

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