A non-destructive testing device

Abstract

This utility model relates to the field of flaw detection device technology, specifically providing a non-destructive testing device. It is fitted onto a cable and driven by a walking mechanism to move along the cable and detect damage. The non-destructive testing device includes a rolling support assembly, a support ring, and a detection coil assembly. The detection coil assembly is ringed on the support ring, which has a through cavity, to generate flaw detection eddy current fields of different depths on the cable surface, enabling targeted detection of damage at different depths. The rolling support assembly is fixedly connected to the support ring and has multiple elastically extendable rolling ends. Each rolling end abuts against the cable surface and is driven by the walking mechanism to move the support ring and detection coil assembly synchronously along the cable. Because the rolling ends of the rolling support assembly are elastically extendable, the support ring and detection coil assembly can move freely and smoothly on the uneven cable surface, preventing the detection coil assembly from being affected by factors such as the cable surface shape and material inhomogeneity.

Description

Technical Field

[0001] This utility model belongs to the field of flaw detection device technology, and more specifically, relates to a non-destructive flaw detection device. Background Technology

[0002] As a core load-bearing component of large bridges such as suspension bridges and cable-stayed bridges, the integrity of its internal structure directly affects the safe operation of the bridge. Under long-term loads and environmental corrosion, cables are prone to damage such as broken wires and corrosion. Currently, non-destructive testing technology for cables has become crucial for ensuring bridge safety; however, existing technologies have certain limitations and are easily affected by factors such as the surface shape and material inhomogeneity of the cables, leading to reduced accuracy in damage detection and making it impossible to accurately assess the extent of damage. Utility Model Content

[0003] The purpose of this invention is to provide a non-destructive testing device to solve the technical problem that the existing cable non-destructive testing technology is easily affected by factors such as the surface shape and material inhomogeneity of the cable, resulting in reduced damage detection accuracy and inability to accurately judge the damage situation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A non-destructive testing device is provided, which is fitted onto a cable and driven to move along the cable by a walking drive mechanism. The non-destructive testing device includes a rolling support assembly, a support ring, and a detection coil assembly for generating eddy current fields of different depths on the surface of the cable. The support ring has a through cavity through which the cable passes, and the detection coil assembly is ringed on the support ring. The rolling support assembly is fixedly connected to the support ring and has multiple elastically extendable rolling ends. Each rolling end abuts against the cable and drives the support ring and the detection coil assembly to move synchronously along the cable.

[0005] Furthermore, an annular groove is provided on the side of the support ring, the axis of the annular groove coincides with the axis of the support ring, and the detection coil group is arranged in the annular groove.

[0006] Furthermore, the rolling support assembly includes multiple rolling groups, each rolling group including a support seat, a telescopic column, a screw, an elastic element, and a rolling element. The support seat has a through hole, one end of the screw passes through the through hole and is threadedly connected to one end of the telescopic column, and the other end of the screw is confined in the support seat on the side opposite to the telescopic seat. The elastic element is elastically compressed between the support seat and the telescopic column, and the rolling element is confined in the end of the telescopic column away from the support seat. Each support seat is fixed to one end of the support ring and is evenly arranged around its axis. Each rolling element abuts against the cable and rolls along the cable.

[0007] Preferably, the telescopic column has a support groove on the end face facing the through hole, and one end of the elastic element abuts against the bottom of the support groove; the threaded hole in the telescopic column that is threaded to the screw is formed by opening the bottom of the support groove along the length direction of the telescopic column.

[0008] Preferably, the rolling support assembly further includes a limiting pin, and the threaded end of the screw is provided with a limiting hole. The telescopic column is provided with an elongated through hole on its side wall. The through hole communicates with the threaded hole and extends along the length direction of the threaded hole. The limiting pin is inserted into the through hole and the limiting hole when the elastic extension stroke of the telescopic column is adjusted to an appropriate position.

[0009] Furthermore, the support base includes a main body and a sleeve, one end of the sleeve is connected to the main body, the through hole is provided on the main body and communicates with the lumen of the sleeve, and the telescopic column is inserted into the sleeve and circumferentially limited within the sleeve.

[0010] Optionally, the support base further includes a plurality of hooks, each hook being arranged around the outer periphery of the through hole in the main body, and the end of the elastic member engaging with each hook.

[0011] Preferably, there are two rolling support components, which are respectively fixed to both ends of the support ring.

[0012] Furthermore, the detection coil group includes a first detection coil for emitting eddy currents and switching or superimposing alternating currents of different frequencies to generate flaw detection eddy current fields of different depths on the cable surface, and a second detection coil for receiving changes in eddy current signals generated by damage. Both the first detection coil and the second detection coil are arranged around the support ring.

[0013] Furthermore, the non-destructive testing device also includes a dual-frequency excitation module for generating two alternating currents of different frequencies, a signal processing module for receiving electrical signals and outputting processed damage feature data, and a display control terminal for receiving the damage feature data and visualizing it. The dual-frequency excitation module is connected to the first detection coil, the second detection coil is connected to the signal processing module, and the signal processing module is connected to the display control terminal.

[0014] The beneficial effects of the non-destructive testing device provided by this utility model are as follows: the non-destructive testing device is fitted onto a cable and driven by a walking drive mechanism to move automatically along the cable and detect damage. The non-destructive testing device includes a rolling support assembly, a support ring, and a detection coil assembly. The detection coil assembly is ringed on the support ring, which has a through cavity, to generate eddy current fields of different depths on the cable surface, enabling targeted detection of damage at different depths. The rolling support assembly is fixedly connected to the support ring and has multiple elastically extendable rolling ends. Each rolling end abuts against the cable surface and is driven by the walking drive mechanism to move synchronously along the cable, causing the support ring and the detection coil assembly to move. Because the rolling end of the rolling support assembly can elastically extend and retract, it can allow the support ring and the detection coil group to move freely and smoothly on the uneven cable surface, so that the detection coil group is not affected by factors such as the shape and material inhomogeneity of the cable surface. During the movement, the detection coil group can generate flaw detection eddy current fields of different depths on the cable surface, thereby achieving targeted detection of damage at different depths on the cable surface and greatly improving the accuracy of damage detection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of the non-destructive testing device provided in this embodiment of the utility model; Figure 2 This is a perspective view of the rolling assembly provided in an embodiment of the present invention; Figure 3 This is an exploded perspective view of the rolling assembly provided in an embodiment of the present invention; Figure 4 This is a perspective view of the telescopic column provided in an embodiment of this utility model.

[0017] The following are the labeling elements in the figure: Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly fixed to or set on the other component, or it may be indirectly fixed to or set on the other component via a third component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component, or it may be indirectly connected to the other component via a third component.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] Please refer to the following as well. Figures 1 to 4 This utility model provides a non-destructive testing device 300, which is fitted onto a cable and driven by a walking drive mechanism to move along the cable. The non-destructive testing device 300 includes a rolling support assembly 310, a support ring 320, and a detection coil group (not shown in the figure) for generating a flaw detection eddy current field of different depths on the surface of the cable. The support ring 320 has a through cavity 301 through which the cable passes, and the detection coil group is ringed on the support ring 320. The rolling support assembly 310 is fixedly connected to the support ring 320 and has multiple elastically retractable rolling ends 302. Each rolling end 302 abuts against the cable and drives the support ring 320 and the detection coil group to move synchronously along the cable. The walking drive mechanism is connected to the support ring 320 or the rolling support assembly 310.

[0023] In this embodiment, the non-destructive testing device 300 is fitted onto the cable and driven by a walking drive mechanism to move automatically along the cable and detect defects and damage. The non-destructive testing device 300 includes a rolling support assembly 310, a support ring 320, and a detection coil assembly. The detection coil assembly is ringed around the support ring 320, which has a through cavity 301, to generate eddy current fields of different depths on the cable surface, enabling targeted detection of damage at different depths. The rolling support assembly 310 is fixedly connected to the support ring 320 and has multiple elastically extendable rolling ends 302. Each rolling end 302 abuts against the cable surface and is driven by the walking drive mechanism to move synchronously along the cable, causing the support ring 320 and the detection coil assembly to move. Because the rolling end 302 of the rolling support assembly 310 can elastically extend and retract, it can allow the support ring 320 and the detection coil group to move freely and smoothly on the uneven cable surface, so that the detection coil group will not be affected by factors such as the shape and material inhomogeneity of the cable surface. During the movement, the detection coil group can generate a flaw detection eddy current field of different depths on the cable surface, thereby realizing targeted detection of damage at different depths on the cable surface and greatly improving the accuracy of damage detection.

[0024] In this embodiment, there is a certain detection distance between the cavity wall of the through cavity 301 of the support ring 320 and the surface of the cable.

[0025] In this embodiment, the detection coil group includes multiple detection coils of different specifications and layouts. One part is the first detection coil, used to emit eddy currents; the other part is the second detection coil, used to receive changes in eddy current signals generated by defects. The detection coil group adopts a special winding process and shielding design to reduce external electromagnetic interference. At the same time, the layout is optimized according to the shape and curvature of the cable to ensure that the eddy current field uniformly covers the detection area, thereby improving the accuracy of signal acquisition.

[0026] Furthermore, an annular groove 303 is provided on the side of the support ring 320, and the axis of the annular groove 303 coincides with the axis of the support ring 320. The detection coil assembly is arranged in the annular groove 303. In this way, installation space is provided for the detection coil assembly, and axial positioning of the detection coil assembly is achieved.

[0027] Furthermore, the rolling support assembly 310 includes multiple rolling groups 340. Each rolling group 340 includes a support seat 341, a telescopic column 342, a screw 343, an elastic element (not shown in the figure), and a rolling element 344. The support seat 341 is provided with a through hole 304. One end of the screw 343 passes through the through hole 304 and is threadedly connected to one end of the telescopic column 342. The other end of the screw 343 is limited to the side of the support seat 341 opposite to the telescopic seat. The elastic element is elastically compressed between the support seat 341 and the telescopic column 342. The rolling element 344 is limited to the end of the telescopic column 342 away from the support seat 341. Each support seat 341 is fixed to one end of the support ring 320 and is evenly arranged around its axis. Each rolling element 344 abuts against the cable and rolls along the cable. In this way, the telescopic column 342 drives the rolling element 344 to move elastically relative to the fixed support 341. It can easily and smoothly roll over uneven cable surfaces, so that the detection coil group will not be affected by factors such as the shape and material of the cable surface.

[0028] In this embodiment, the elastic element is a helical spring, which is sleeved on the screw 343.

[0029] In this embodiment, each rolling group 340 is evenly arranged around the axis of the support ring 320. There can be three, four, etc. The number of these groups is sufficient to support the support ring 320 and drive it to move stably. There is no limitation here.

[0030] Preferably, the telescopic column 342 has a support groove 305 on the end face facing the through hole 304, and one end of the elastic element abuts against the bottom of the support groove 305; the threaded hole 306 in the telescopic column 342 that is threadedly connected to the screw 343 is formed by opening the bottom of the support groove 305 along the length direction of the telescopic column 342. In this way, a limiting space is provided for the elastic element, ensuring that the telescopic column 342 can move elastically and stably.

[0031] Preferably, the rolling support assembly 310 further includes a limiting pin (not shown in the figure). The threaded end of the screw 343 is provided with a limiting hole 307. The telescopic column 342 is provided with an elongated through hole 308 on its side wall. The through hole 308 communicates with the threaded hole 306 and extends along the length of the threaded hole 306. When the elastic extension stroke of the telescopic column 342 is adjusted to an appropriate value, the limiting pin is inserted into the through hole 308 and the limiting hole 307 to achieve circumferential limiting of the screw 343 and prevent it from rotating relative to the telescopic column 342, thereby disrupting the adjusted extension stroke.

[0032] Furthermore, the support base 341 includes a main body 3411 and a sleeve 3412. One end of the sleeve 3412 is connected to the main body 3411. A through hole 304 is provided on the main body 3411 and communicates with the cavity of the sleeve 3412. The telescopic column 342 is inserted into the sleeve 3412 and circumferentially confined within the sleeve 3412. In this way, the telescopic column 342 can move directionally and telescopically along the length of the sleeve 3412, while the telescopic column 342 will not rotate relative to the sleeve 3412.

[0033] In this embodiment, the telescopic column 342 has a tangential plane 3403 on its outer side, and the inner wall of the sleeve 3412 also has a plane that matches the tangential plane 3403, thereby achieving circumferential limiting of the telescopic column 342. Of course, a keyway fit structure can also be used. Here, circumferential limiting is not specially limited, as long as it meets the circumferential limiting requirements.

[0034] In this embodiment, the telescopic column 342 includes a connecting section 3421, a drum-shaped section 3422, and a rolling section 3423 connected sequentially. A threaded hole 306, a support groove 305, a through hole 308, and a cutting plane 3403 are all provided on the connecting section 3421. The diameter of the drum-shaped section 3422 is equal to or smaller than the diameter of the connecting section 3421, used to increase the strength under shear force. The diameter of the rolling section 3423 is larger than the diameter of the sleeve 3412. When the telescopic column 342 is subjected to external reaction force and forced to lock the sleeve 3412, it can abut against the opening of the sleeve 3412, preventing the sleeve 3412 from scratching the cable. The rolling section 3423 has a hemispherical groove 309 on its surface opposite to the drum-shaped section 3422 for inserting a rolling element 344, which is a ball bearing. In this embodiment, the telescopic column 342 also includes a plurality of support ribs 3424 connected between the roll section 3423 and the drum-shaped section 3422. Each support rib 3424 is evenly distributed around the axis of the drum-shaped section 3422. When the telescopic column 342 retracts to the opening of the sleeve 3412, each support rib 3424 abuts against the opening of the sleeve 3412, avoiding contact between the roll section 3423 and the opening surface, thus preventing severe abrasion. Moreover, the support ribs 3424 effectively enhance the tangential force resistance of this section.

[0035] In this embodiment, each rolling assembly 340 also includes a fastening member 345. The fastening member 345 is provided with a spherical hole 3401. The fastening member 345 is fixed in the end face of the rolling section 3423 away from the drum-shaped section 3422. The spherical hole 3401 and the hemispherical groove 309 together form a rolling space that wraps around the rolling member 344. At the same time, the rolling member 344 is exposed to the outside world through the spherical hole 3401 of the fastening member 345 and comes into contact with the surface of the cable.

[0036] In this embodiment, the sleeve 3412 has a through mounting hole 3402 on its outer tube wall for the limit pin between the telescopic column 342 and the screw 343 to pass through and be installed.

[0037] Optionally, the support base 341 also includes multiple hooks 3413, each hook 3413 arranged around the outer periphery of the through hole 304 in the main body 3411, and the end of the elastic member engaging with each hook 3413. In this way, the hooks 3413 and the support groove 305 limit the ends of the elastic member, ensuring that the elastic member can stably extend and retract within its elastic stroke range.

[0038] Preferably, two rolling support components 310 are provided, which are respectively fixed to both ends of the support ring 320. In this way, the support ring 320 is provided with stable support, and at the same time, the support ring 320 can be driven to move more stably along the cable.

[0039] In this embodiment, the non-destructive testing device 300 also includes two fixed rings 350 and rolling support components 310 located at each end of the support ring 320. These components are fixed between the end faces of the fixed ring 350 and the support ring 320, that is, each rolling assembly 340 is fixed between the end faces of the fixed ring 350 and the support ring 320 to improve the stability of each rolling assembly 340.

[0040] Furthermore, the detection coil group includes a first detection coil for emitting eddy currents and switching or superimposing different frequency alternating currents to generate flaw detection eddy current fields of different depths on the cable surface, and a second detection coil for receiving changes in eddy current signals generated by damage. Both the first and second detection coils are encircled on the support ring 320.

[0041] Furthermore, the non-destructive testing device 300 also includes a dual-frequency excitation module for generating two different frequencies of alternating current, a signal processing module for receiving electrical signals and outputting processed damage feature data, and a display control terminal for receiving damage feature data and visualizing it. The dual-frequency excitation module is connected to the first detection coil, the second detection coil is connected to the signal processing module, and the signal processing module is connected to the display control terminal.

[0042] In this embodiment, the non-destructive testing device 300 mainly consists of four parts: a dual-frequency excitation module, a detection coil group, a signal processing module, and a display and control terminal. The dual-frequency excitation module generates two alternating currents of different frequencies; for example, the high frequency is used to detect surface defects, while the low frequency, with its strong penetration capability, is used to detect deep defects. By switching or superimposing different frequency currents, the detection coils generate eddy current fields of different depths and characteristics on the cable surface, enabling targeted detection of defects at different depths and solving the problem of limited detection depth with a single frequency. The detection coil group contains multiple detection coils of different specifications and layouts. One part is the first detection coil, used to emit eddy currents; the other part is the second detection coil, used to receive changes in the eddy current signal generated by the defects. The detection coil group adopts a special winding process and shielding design to reduce external electromagnetic interference. Simultaneously, its layout is optimized according to the shape and curvature of the cable to ensure that the eddy current field uniformly covers the detection area, improving the accuracy of signal acquisition. The signal processing module receives the weak electrical signals transmitted by the detection coil group and, through filtering, amplification, and phase analysis, separates the characteristic signals related to the defects at different frequencies. Advanced algorithms are used to analyze signals and determine the location, size, and type of defects. In this way, by applying multi-frequency alternating current to the detection coil assembly, eddy currents are generated on the cable surface. The magnetic field changes generated by the interaction between the eddy currents and the defect damage are then used to detect near-surface and deep defects in the cable.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-destructive testing device which is fitted on a cable and is driven to move along the cable by a traveling drive mechanism, characterized by, The non-destructive testing device includes a rolling support assembly, a support ring, and a detection coil group for generating eddy current fields of different depths on the surface of the cable. The support ring has a through cavity through which the cable passes, and the detection coil group is ringed on the support ring. The rolling support assembly is fixedly connected to the support ring and has multiple elastically extendable rolling ends. Each rolling end abuts against the cable and drives the support ring and the detection coil group to move synchronously along the cable.

2. The non-destructive inspection apparatus of claim 1, wherein The support ring has an annular groove on its side, the axis of the annular groove coincides with the axis of the support ring, and the detection coil group is arranged in the annular groove.

3. The non-destructive inspection apparatus of claim 1, wherein The rolling support assembly includes multiple rolling groups, each rolling group including a support seat, a telescopic column, a screw, an elastic element, and a rolling element. The support seat has a through hole, one end of the screw passes through the through hole and is threadedly connected to one end of the telescopic column, and the other end of the screw is confined in the support seat on the side opposite to the telescopic column. The elastic element is elastically compressed between the support seat and the telescopic column, and the rolling element is confined in the end of the telescopic column away from the support seat. Each support seat is fixed to one end of the support ring and is evenly arranged around its axis. Each rolling element abuts against the cable and rolls along the cable.

4. The non-destructive testing device of claim 3, wherein, The telescopic column has a support groove on the end face facing the through hole, and one end of the elastic element abuts against the bottom of the support groove; the threaded hole in the telescopic column that is threaded to the screw is formed by opening the bottom of the support groove along the length direction of the telescopic column.

5. The non-destructive testing device of claim 4, wherein, The rolling support assembly also includes a limiting pin. The threaded end of the screw is provided with a limiting hole. The telescopic column has an elongated through hole on its side wall. The through hole communicates with the threaded hole and extends along the length of the threaded hole. The limiting pin is inserted into the through hole and the limiting hole when the elastic extension stroke of the telescopic column is adjusted to an appropriate position.

6. The apparatus of claim 3 wherein the means for generating a beam of coherent radiation is a laser. The support base includes a main body and a sleeve. One end of the sleeve is connected to the main body. The through hole is provided on the main body and communicates with the lumen of the sleeve. The telescopic column is inserted into the sleeve and circumferentially limited within the sleeve.

7. The apparatus of claim 6 wherein the means for generating a signal comprises a means for generating a signal having a frequency of about 1 MHz to about 10 GHz. The support base also includes multiple hooks, each hook being arranged around the outer periphery of the through hole in the main body, and the end of the elastic member engaging with each hook.

8. The non-destructive testing apparatus of any one of claims 3 to 7, wherein, Two rolling support components are provided, which are respectively fixed to both ends of the support ring.

9. The non-destructive testing apparatus of any one of claims 1 to 7, wherein, The detection coil group includes a first detection coil for emitting eddy currents and switching or superimposing alternating currents of different frequencies to generate flaw detection eddy current fields of different depths on the cable surface, and a second detection coil for receiving changes in eddy current signals generated by damage. Both the first detection coil and the second detection coil are arranged around the support ring.

10. The non-destructive inspection apparatus of claim 9, wherein The non-destructive testing device further includes a dual-frequency excitation module for generating two different frequencies of alternating current, a signal processing module for receiving electrical signals and outputting processed damage feature data, and a display control terminal for receiving the damage feature data and visualizing it. The dual-frequency excitation module is connected to the first detection coil, the second detection coil is connected to the signal processing module, and the signal processing module is connected to the display control terminal.

Images