Detection equipment for cable surface defects

Abstract

The invention discloses cable surface defect detection equipment, which comprises a bending part for bending a cable in an annular shape, a limiting part for limiting the cable is arranged on the bending part, a marking liquid storage part for marking the cable surface defect is arranged on the bending part, and the marking liquid storage part is used for storing marking liquid. A positioning piece for positioning cable surface defects is arranged on the storage piece; the outer bending piece and the inner bending piece are carried through the U-shaped mounting frame of the bending piece, the cable is annularly bent in a winding mode in the shape of the Chinese character '& ', hidden or tiny surface defects are naturally expanded due to bending stress, meanwhile, the moving resistance of the cable is reduced by means of rotating connection of a rotating cylinder, the turning-over design in the moving process of the cable is matched, and the cable is more stable in moving. And full-surface dead-corner-free detection of the cable is realized.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, specifically to a testing device for surface defects in cables. Background Technology

[0002] Cables are composite insulated conductor assemblies with a conductive metal core, an outer insulation layer, and a protective sheath. They are specifically designed for transmitting electrical energy, signals, or converting electromagnetic energy. Widely used in power systems, communication networks, industrial equipment, and building wiring, cables are the core carriers of energy transmission and information delivery. Cable surface defect detection is a crucial technology for ensuring safe cable operation. It involves using professional techniques such as manual visual inspection, machine vision recognition, ultrasonic scanning, and infrared thermal imaging to accurately identify and locate various abnormal defects on the cable's outer surface, such as cracks, scratches, and bulges, and to scientifically assess the size, depth, and impact of these defects. This detection can proactively identify potential safety hazards caused by surface defects, such as insulation failure, leakage, short circuits, and even fires. It provides data support for cable maintenance, repair, or replacement, thereby ensuring the stable operation of power and communication systems, extending cable lifespan, and reducing maintenance costs.

[0003] When performing surface defect inspection on existing cables, the outer surface of the cable is made of rubber, which has a certain degree of elasticity. External defects such as cracks and scratches on the cable often shrink and close due to the elasticity of the material. The shape of the defect is easily changed when subjected to stress or changes in ambient temperature, making it difficult to maintain a fixed state. At the same time, the rubber surface itself has fine textures, and the depth, width and texture of some shallow surface defects are very similar. Moreover, defects are easily covered by dust and oil that accumulates during use, which makes it easy to miss them during inspection. Conventional testing equipment also has difficulty accurately distinguishing normal textures from real defects, and cannot effectively capture small or hidden defect information, thus affecting the accuracy of the test results. Summary of the Invention

[0004] The purpose of this invention is to address the problems encountered in existing cable surface defect detection methods. Because the outer surface of cables is made of rubber, which has a certain degree of elasticity, external defects such as cracks and scratches often shrink and close due to the material's elasticity. These defects are easily altered by stress or changes in ambient temperature, making it difficult to maintain a fixed state. Furthermore, the rubber surface itself has fine textures, and the depth, width, and texture differences of some shallow surface defects are minimal. These defects are also easily covered by dust and oil accumulated during use, leading to missed detections. Conventional testing equipment also struggles to accurately distinguish normal textures from actual defects, failing to effectively capture minute or hidden defect information, thus affecting the accuracy of the detection results. Therefore, this invention provides a device for detecting cable surface defects.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a detection device for cable surface defects, comprising: a bending member for bending the cable into a ring shape, a limiting member for limiting the cable on the bending member, a marking liquid storage device for marking cable surface defects on the bending member, and a positioning member for locating cable surface defects on the storage device.

[0006] The bending component includes a U-shaped mounting bracket, on which an outer bending component and an inner bending component are provided. The outer bending component and the inner bending component are distributed in a 1-shape, and the outer bending component and the inner bending component have the same structure.

[0007] The outer bending component includes a mounting shaft that passes through the side end of the mounting bracket. A rotating cylinder is sleeved on the outer circular surface of the mounting shaft, and the rotating cylinder is rotatably connected to the mounting shaft. The inner bending component also includes a mounting shaft and a rotating cylinder.

[0008] The cable is wound in an '&' shape around the rotating drums of the outer and inner bends. One end of the cable is connected to the winding device. Under the power traction of the winding device, the cable moves smoothly along the rotating drums of the outer and inner bends. During the movement, the cable first adheres to one side of the rotating drum of the outer bend. When it continues to move to the rotating drum of the inner bend, the side that was originally adhered to the rotating drum of the outer bend will turn outward.

[0009] As a further embodiment of the present invention: the limiting member includes a threaded rod that passes through the mounting frame and is threadedly connected to the mounting frame, one end of the threaded rod passes through the mounting frame and is fixedly connected to a connecting block, an abutment block is rotatably connected to the outside of the connecting block, and a handle is passed through the outer circular surface of the threaded rod located on the outer side of the mounting frame.

[0010] As a further aspect of the present invention: four sets of limiting members are provided, symmetrically distributed above the outer bending member and below the inner bending member, to limit the cable wound on the outer bending member and the inner bending member.

[0011] As a further embodiment of the present invention: the positioning component includes a mounting plate fixedly connected to the bottom end of the storage component, a moving groove is formed through the mounting plate, a T-shaped guide rod is connected through the moving groove, a T-shaped connecting plate is fixedly connected to the end of the guide rod away from the mounting plate, a positioning rod is fixedly connected to one end of the connecting plate, the positioning rod is conical, its tip abuts against the outer surface of the cable, a spring is sleeved on the outside of the guide rod, one end of the spring abuts against the mounting plate, and the other end abuts against the connecting plate.

[0012] As a further embodiment of the present invention: multiple sets of positioning elements are provided, which are evenly distributed in a semi-circle at the bottom of the storage element, and the positioning elements are in an inclined state, with the tip of the positioning rod being the lowest point.

[0013] As a further embodiment of the present invention: the storage component includes a replenishment tank fixedly connected to the mounting frame, and a storage tank is connected through the bottom of the replenishment tank. Multiple sets of storage tanks are provided, which are evenly distributed in a semi-circle at the bottom of the replenishment tank. Each set of storage tanks is provided with a set of positioning components. The bottom of the storage tank is inclined, and the side facing the mounting frame is the lower end.

[0014] As a further embodiment of the present invention: the side end of the connecting plate is provided with a convex-shaped adjustment groove, and two sets of adjustment grooves are provided, symmetrically distributed on both sides of the connecting plate. A set of convex-shaped sliding blocks are slidably connected in each set of adjustment grooves. One end of the sliding block passes through the adjustment groove and is fixedly connected to an extension plate. The top end of the extension plate passes through the bottom end of the liquid storage tank and is fixedly connected to a block. The block is triangular in shape, and its bottom end is flush with the bottom end of the liquid storage tank.

[0015] As a further embodiment of the present invention: a drain hole is provided through the corresponding area between the bottom of the liquid storage tank and the bottom of the block, and multiple sets of drain holes are evenly distributed between the two sets of extension plates.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In this invention, the U-shaped mounting bracket of the bending component carries the outer bending component and the inner bending component. The cable is formed into a ring bend by the '&' shaped winding method. This allows hidden or minor surface defects to be naturally amplified due to the bending force. At the same time, the rotation connection of the rotating cylinder reduces the resistance of cable movement. Combined with the flipping design during cable movement, it can achieve full-surface inspection of the cable without dead angles. Furthermore, through four sets of symmetrically distributed limiting components, the thread transmission of the threaded rod adjusts the fit between the abutment block and the cable. This effectively limits the lateral deviation and longitudinal jump of the cable during movement, and ensures that the force is uniform and does not affect the smooth transmission of the cable. This ensures the stability of the inspection process and the effectiveness of defect identification.

[0018] 2. In this invention, multiple sets of semi-circularly evenly distributed conical positioning rods are used as positioning components. Combined with the metal elasticity of the positioning rods themselves, a full-range scanning coverage of the outer surface of the cable is achieved. With the extension and retraction of the guide rods and springs, it adapts to the detection requirements of cables with different diameters, always maintaining flexible contact between the positioning rods and the cable surface, avoiding damage to the cable and improving detection sensitivity. At the same time, it can move synchronously to trigger linkage when contacting defects. After the defects are separated, it can quickly return to the initial state by its own elasticity and spring reset force, ensuring the continuity and accuracy of detection and effectively avoiding missed detections and false detections.

[0019] 3. In this invention, the liquid replenishment tank of the storage component is connected to multiple sets of liquid storage tanks through a design. Combined with the inclined structure of the bottom of the liquid storage tank facing the mounting frame, it is ensured that the marking liquid is stored sufficiently and can flow naturally and smoothly. By using the one-to-one correspondence between the liquid storage tank and the positioning component, combined with the linkage control of the plug and the drain hole, the marking liquid is released only when a defect is detected, realizing on-demand supply and avoiding waste. Then, through the tilting guidance of the connecting plate, the marking liquid is accurately directed to the tip of the positioning rod and dripped onto the defect, making the defect marking clear and accurate, providing clear guidance for subsequent cable defect investigation and repair. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the distribution structure of the positioning components in this invention;

[0022] Figure 3 This is a schematic diagram of the bending component in this invention;

[0023] Figure 4 In this invention Figure 3 A schematic diagram of the structure at point A;

[0024] Figure 5 This is a schematic diagram of the positioning component in this invention;

[0025] Figure 6 This is a schematic diagram of the storage device in this invention;

[0026] Figure 7 In this invention Figure 5 A schematic diagram of the structure at point B;

[0027] Figure 8 In this invention Figure 6 A schematic diagram of the structure at point C.

[0028] In the diagram: 1. Bending component; 11. Mounting bracket; 12. Outer bending component; 121. Mounting shaft; 122. Rotating cylinder; 13. Inner bending component; 2. Limiting component; 21. Abutment block; 22. Connecting block; 23. Threaded rod; 24. Handle; 3. Positioning component; 31. Mounting plate; 32. Moving groove; 33. Guide rod; 34. Connecting plate; 35. Positioning rod; 36. Spring; 4. Storage component; 41. Replenishment tank; 42. Storage tank; 43. Adjustment groove; 44. Sliding block; 45. Extension plate; 46. Block; 47. Drain hole. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0031] Reference Figures 1 to 2 In this embodiment of the invention, a detection device for cable surface defects includes: a bending member 1 for bending the cable into a ring shape, a limiting member 2 for limiting the cable on the bending member 1, a marking liquid storage device 4 for marking cable surface defects on the bending member 1, and a positioning member 3 for locating cable surface defects on the storage device 4.

[0032] Reference Figures 3 to 4The bending component 1 includes a U-shaped mounting bracket 11 made of high-strength alloy material. Precise mounting holes are pre-drilled inside the U-shaped opening of the mounting bracket 11. An outer bending component 12 and an inner bending component 13 are respectively installed within these mounting holes. The outer bending component 12 and the inner bending component 13 are arranged vertically in a 1 / 4 shape along the central axis of the U-shaped opening of the mounting bracket 11. Their structures are completely identical and symmetrically arranged, forming a support structure suitable for the annular bending of the cable. Positioning components 3 and storage components 4 are fixed to both sides of the outer bending component 12 and the inner bending component 13 by bolts. The installation positions of the positioning components 3 and the storage components 4 maintain a preset matching distance with the outer circular surface of the rotating cylinder 122 of the bending component, ensuring precise contact between the cable and the positioning rod 35 of the positioning component 3 when the cable moves. The outer bending component 12... The mounting shaft 121, which is interference-fitted and passes through a pre-drilled hole on the side of the mounting bracket 11, includes a rotating cylinder 122 fitted on its outer surface. The rotating cylinder 122 is made of wear-resistant engineering plastic and its outer surface is smoothed. It is flexibly connected to the mounting shaft 121 via ball bearings to reduce friction damage during cable movement. The inner bending component 13 is also composed of the mounting shaft 121 and the rotating cylinder 122, and the specifications of each component are completely consistent with those of the outer bending component 12, ensuring uniform force during cable winding. The limiting component 2 includes a threaded rod 23 with fine threads on its outer surface. The threaded rod 23 passes through a pre-drilled threaded hole in the mounting bracket 11 and is threadedly connected to the threaded hole. The fine thread design improves adjustment accuracy. The end of the threaded rod 23 near the cable is fixed by welding. A rectangular connecting block 22 is fixedly connected, and an abutment block 21 is rotatably connected to the outside of the connecting block 22 via a pin. A handle 24 with anti-slip texture is connected through the outer surface of one end of the threaded rod 23 located outside the mounting bracket 11, facilitating operator grip and adjustment. Four sets of limiting components 2 are provided, two sets symmetrically distributed on both sides of the cable above the outer bending component 12, and the other two sets symmetrically distributed on both sides of the cable below the inner bending component 13. These four sets of limiting components 2 form a bidirectional limiting structure, specifically designed to precisely limit the cable wound on the outer bending component 12 and the inner bending component 13. When the cable to be tested is tightly wound in an "&" shape on the outer surface of the rotating drum 122 of the outer bending component 12 and the inner bending component 13, and one end of the cable is firmly fixed to the clamping mechanism of the winding device, the operator... The operator first holds the handles 24 of the four sets of limiting components 2, and rotates the handles 24 clockwise to drive the threaded rods 23 to slowly feed towards the cable along the threaded holes of the mounting bracket 11. The threaded rods 23 push the connecting blocks 22 to move synchronously, so that the abutment blocks 21 rotatably connected to the outer side of the connecting blocks 22 gradually approach the outer surface of the cable, ensuring that the abutment blocks 21 of the four sets of limiting components 2 are all gently in contact with the outer surface of the cable and the force is uniform. After the limiting adjustment is completed, the winding device is started. Under the power traction of the winding device, the cable moves smoothly along the rotating cylinders 122 of the outer bending component 12 and the inner bending component 13. The rotating cylinders 122 rotate synchronously around the mounting shaft 121. The 1 / 4-shaped distribution of the outer bending component 12 and the inner bending component 13 ensures that the cable maintains a stable annular bend during the movement.The positioning elements 3 and storage elements 4 on both sides always correspond to the inspection surface of the cable, ensuring subsequent defect detection and marking.

[0033] The above solution provides stable overall support through the U-shaped mounting bracket 11 of the bending component 1. Combined with the symmetrical distribution and identical structural design of the outer bending component 12 and the inner bending component 13, it ensures that the cable can form a uniform and stable annular bend after winding, creating favorable conditions for the natural expansion of hidden or minor defects. Through the four sets of symmetrical distribution design of the limiting component 2, combined with the fine thread adjustment structure of the threaded rod 23, the contact force between the abutment block 21 and the cable can be precisely controlled, effectively limiting the lateral offset and longitudinal jump during the cable movement process, and preventing cable positioning deviation from affecting the detection effect.

[0034] Reference Figure 5The positioning component 3 includes a mounting plate 31 that is bolted to the bottom of the liquid storage tank 42 of the storage component 4. The mounting plate 31 is made of high-strength stainless steel and its dimensions are adapted to the bottom of the liquid storage tank 42 to ensure stable installation and prevent deformation. A long strip-shaped moving groove 32 is formed through the mounting plate 31, and a T-shaped guide rod 33 is connected through the moving groove 32. The length and width of the moving groove 32 are precisely matched with the dimensions of the T-shaped guide rod 33 to provide a stable sliding trajectory for the guide rod 33 and prevent deviation. The T-shaped guide rod 33 connected through the moving groove 32 is made of hard alloy material, and its lateral end is larger than the width of the moving groove 32 to form a limiting structure. The end of the guide rod 33 away from the mounting plate 31 is fixed by welding. A T-shaped connecting plate 34 is attached. The horizontal portion of the connecting plate 34 is perpendicular to the guide rod 33, and the vertical portion extends to the cable detection area. The material of the connecting plate 34 is consistent with that of the guide rod 33 to ensure structural strength. A positioning rod 35 is integrally formed and fixedly connected to the end of the connecting plate 34 away from the guide rod 33. The positioning rod 35 has a tapered structure and is made of steel with good metal elasticity. Its tip is finely ground to be smooth and burr-free to avoid scratching the outer surface of the cable. The tip always maintains line contact with the outer surface of the cable. A compression spring 36 is sleeved on the outside of the guide rod 33. The spring 36 is a stainless steel spring with a moderate elastic coefficient. One end of the spring 36 is tightly abutted against the inner end face of the mounting plate 31, and the other end is tightly abutted against the inner end face of the connecting plate 34. In its natural state, the connecting plate 34 is pushed to keep the positioning rod 35 in its initial outward extension position. Multiple sets of positioning elements 3 are evenly distributed in a semi-circular pattern at the bottom of the liquid storage tank 42 of the storage component 4. The spacing between adjacent sets of positioning elements 3 is equal, and the entire assembly is inclined to ensure that the tip of the positioning rod 35 is at its lowest point, naturally conforming to the outer surface of the cable. When the cable to be tested is wound in a '&' shape around the rotating cylinder 122 of the outer bending component 12 and the inner bending component 13, and simultaneously passes through multiple sets of semi-circularly distributed positioning elements 3, the outer surface of the cable naturally abuts against the conical tip of the positioning rod 35 of each set of positioning elements 3. The cable tension pushes the positioning rod 35 in the opposite direction, moving it away from the cable. The positioning rod 35 drives the T-shaped connecting plate 34 to move synchronously, and the connecting plate 34 squeezes the sleeve... A compression spring 36 located on the outside of the guide rod 33 causes the spring 36 to contract along the axis of the guide rod 33. Simultaneously, the guide rod 33 slides smoothly in a straight line along the moving groove 32 of the mounting plate 31. When defects such as cracks or scratches exist on the cable surface, the uneven structure at the defect point forms abnormal contact with the tip of the positioning rod 35. The resulting pressure difference pushes the positioning rod 35 to further drive the guide rod 33 to slide upward along the moving groove 32. The connecting plate 34 moves synchronously and triggers the drainage mechanism of the storage component 4. When the cable defect point completely disengages from the tip of the positioning rod 35, the elastic restoring force of the compression spring 36 pushes the connecting plate 34 to move in the opposite direction, causing the guide rod 33 to return to its initial position along the moving groove 32. Under the combined action of its own metallic elasticity and the force of the spring 36, the positioning rod 35...It quickly restores its contact with the outer surface of the cable and continuously scans and inspects the surface of the subsequently moving cable.

[0035] The above scheme employs a design with multiple semi-circularly evenly distributed positioning elements 3, combined with an inclined setup and a structure where the tip of the positioning rod 35 is the lowest point, achieving full coverage scanning of the cable's outer surface. This ensures that surface defects are captured. The positioning rod 35 is made of elastic steel with a tapered structure and a smooth, polished tip. This design leverages the material's inherent metallic elasticity to enhance sensitivity in contact with defects while avoiding damage to the cable insulation layer from rigid contact. The T-shaped guide rod 33 precisely engages with the elongated moving groove 32 of the mounting plate 31, along with a compression spring 36 with a suitable elastic coefficient. This allows the positioning rod 35 to adaptively adjust its extension and retraction amplitude according to cables of different diameters, maintaining stable and flexible contact with the cable surface and improving the adaptability of the detection. The elastic support and reset function of the spring 36, combined with the inherent metallic elasticity of the positioning rod 35, ensures that the positioning element 3 quickly resets after a defect is removed, guaranteeing the continuity of the detection process and effectively avoiding missed or false detections due to reset delays. This also improves overall detection efficiency.

[0036] Reference Figures 6 to 8The storage component 4 includes a replenishment tank 41 fixedly connected to the mounting bracket 11 via an L-shaped fixing frame. The replenishment tank 41 is made of transparent, corrosion-resistant engineering plastic and has a replenishment port with a sealed cap on the top for easy observation of the remaining marking liquid and timely replenishment. Its internal volume is adapted to the needs of batch testing, ensuring that frequent replenishment is not required for long-term testing. The bottom of the replenishment tank 41 is connected to multiple sets of storage tanks 42 through an integrally formed through pipe. The number of storage tanks 42 is perfectly matched with the positioning component 3, and they are evenly distributed in a semi-circle at the bottom of the replenishment tank 41. The spacing between two adjacent sets of storage tanks 42 is equal, and the central axis of each set of storage tanks 42 is precisely aligned with the axis of the positioning rod 35 of the corresponding positioning component 3. The storage tanks 42 are also made of corrosion-resistant material, and their bottoms are precision-processed. The inclined structure of the workpiece, with the lower end facing the mounting bracket 11, ensures that the marking liquid can flow naturally to the drainage area under gravity. Two sets of convex-shaped adjustment grooves 43 are provided on the side of the connecting plate 34 of the positioning component 3. These two sets of adjustment grooves 43 are symmetrically distributed on the left and right sides of the connecting plate 34. The inner walls of the adjustment grooves 43 are polished to reduce sliding resistance. A set of convex-shaped sliding blocks 44 is slidably connected within each adjustment groove 43. The convex structure of the sliding blocks 44 precisely matches the groove of the adjustment groove 43 to prevent them from falling off during sliding. The sliding blocks 44 are made of wear-resistant alloy material to extend their service life. An extension plate 45 is welded to the end of the sliding block 44 away from the adjustment groove 43. The extension plate 45 is a long strip of metal, its length adapted to the storage tank 42. The top of the extension plate 45 extends through a pre-set through hole at the bottom of the liquid storage tank 42 and into the interior. A sealing sleeve is provided between the through hole and the extension plate 45 to prevent leakage of the marking liquid. A triangular plug 46 is fixedly connected to the top of the extension plate 45 by bolts. The plug 46 is made of elastic sealing material, and its bottom end is completely flush with the bottom of the liquid storage tank 42. Its side is tightly fitted with the inner wall of the liquid storage tank 42 to achieve a sealing effect. Multiple sets of drainage holes 47 are opened through the area corresponding to the bottom of the plug 46 at the bottom of the liquid storage tank 42. The drainage holes 47 are evenly distributed between the two sets of extension plates 45 to ensure that the marking liquid can drip evenly and will not block. When the positioning rod 35 of the positioning component 3 moves upward due to a defect on the cable surface, the positioning rod 35 drives the connecting plate 34 to move upward synchronously. The U-shaped adjusting groove 43 on the side of the connecting plate 34 moves accordingly. Through the contact force between the groove wall and the sliding block 44, the sliding block 44 is driven to slide vertically along the adjusting groove 43. The sliding block 44 drives the extension plate 45 to be lifted upward. The extension plate 45 pulls the top block 46 upward synchronously, so that the block 46 is separated from the drain hole 47 area at the bottom of the liquid storage tank 42, releasing the seal. At this time, the marking liquid in the liquid storage tank 42 flows along the bottom slope under the action of gravity to the drain hole 47. It drips evenly onto the inclined surface of the connecting plate 34 through multiple sets of drain holes 47. Under the guidance of the connecting plate 34, it flows accurately to the tip of the positioning rod 35 and finally drips onto the defect on the cable surface to complete the marking. When the cable defect separates from the tip of the positioning rod 35,The positioning rod 35 moves downward under its own elasticity and the restoring force of the spring 36. The connecting plate 34 drives the adjusting groove 43 to move in the opposite direction. The sliding block 44 falls back along the adjusting groove 43. The extension plate 45 pushes the plug 46 to re-fit against the bottom of the liquid storage tank 42. The triangular structure of the plug 46 completely seals the area of ​​the drain hole 47, stopping the release of the marking liquid.

[0037] The above solution achieves batch storage and continuous supply of the marking liquid through the through-connection design of the replenishment tank 41 of the storage component 4 and multiple sets of storage tanks 42, improving ease of use. The inclined design at the bottom of the storage tank 42, combined with the low-position distribution of the drain hole 47, ensures that the marking liquid flows naturally and smoothly under gravity, without the need for an additional power device, reducing energy consumption and failure risk. The precise cooperation between the convex adjustment groove 43 of the connecting plate 34 and the sliding block 44 enables the linkage control between the positioning component 3 and the storage component 4, opening the drain hole 47 only when a defect is detected, avoiding meaningless consumption of the marking liquid and achieving on-demand supply. The elastic sealing material and triangular structure of the plug 46 ensure the sealing effect of the drain hole 47, preventing leakage in non-detection states. The uniform distribution of multiple sets of drain holes 47 and the precise alignment of the positioning rod 35 ensure that the marking liquid can be accurately dripped onto the defect, forming a clear and accurate mark, providing clear guidance for subsequent defect investigation.

[0038] The working principle of this invention is as follows: In use, one end of the cable to be tested is first passed through the pre-reserved channel of the equipment and wound in a '&' shape around the rotating cylinder 122 of the outer bending member 12 and the inner bending member 13. The structural characteristics of the bending member 1 create a bending state on the cable surface, causing previously hidden or minor surface defects to naturally expand due to the bending force, facilitating subsequent inspection. Simultaneously, it must be ensured that the cable is tightly fitted to the outer surface of the rotating cylinder 122 without any looseness. During the winding process, the cable is simultaneously passed through multiple sets of positioning members 3, which are evenly distributed in a semi-circle. The positioning rods 35 themselves possess a certain degree of metallic elasticity, and the tips of the multiple sets of positioning rods 35 are evenly distributed in a semi-circle, capable of fully covering the outer surface of the cable, performing an all-round scan of the moving cable surface on the bending member 1. During testing, when the cable passes through, its outer surface naturally abuts against the tip of the positioning rod 35. During this contact, the cable pushes the positioning rod 35 in the opposite direction, causing the guide rod 33 to move towards the mounting plate 31. This, in turn, causes the spring 36 to contract under force. The design of the guide rod 33 and the spring 36 allows for adaptive adjustment of the extension range according to the cable diameter, ensuring that the positioning rod 35 maintains stable flexible contact with the cable surface regardless of the cable diameter. This avoids damage to the cable insulation layer or affecting the sensitivity of defect detection due to rigid contact. Subsequently, the other end of the cable is securely fixed to the clamping mechanism of the winding device to ensure reliable connection and prevent slippage or displacement during traction. Next, the limiters 2 are adjusted by rotating the handles 24 of the four sets of limiters 2 through the threads. The threaded drive of rod 23 and mounting bracket 11 drives connecting block 22 to slowly move abutment block 21 towards the cable. Two sets of limiting members 2 are symmetrically distributed above the outer bend 12, and the other two sets are symmetrically distributed below the inner bend 13. During adjustment, the contact state between abutment block 21 and cable surface must be observed in real time to ensure that abutment block 21 gently contacts the outer surface of the cable. This effectively limits the lateral deviation and longitudinal jump of the cable during movement without generating excessive resistance that would affect the smooth movement of the cable. At the same time, it is necessary to ensure that the force of the four sets of limiting members 2 is uniform to avoid cable deviation due to uneven force. After all installation and adjustment are completed, the winding device is started, and its stable power pulls the cable along the outer bend 12 and inner bend 13. The rotating cylinder 122 of the 3rd member moves smoothly. During the movement, the cable first adheres to one side of the rotating cylinder 122 of the outer bending member 12. When it moves to the rotating cylinder 122 of the inner bending member 13, the side that was originally adhering to the rotating cylinder 122 will naturally turn outward. Combined with the defect amplification effect brought about by the bending member 1, accurate detection of the entire surface of the cable without dead angles is achieved. If there are defects such as cracks or scratches on the cable surface, the amplified defect will form obvious abnormal contact with the tip of the positioning rod 35. With the help of the metal elasticity of the positioning rod 35 and the moving traction force of the cable, the positioning member 3 is driven to move upward synchronously with the moving direction of the cable. During this process, the positioning member 3 drives the extension plates 45 on both sides to move upward through the connecting plate 34, thereby pulling the block 46 away from the drain hole 47.At this time, the marking liquid in the storage tank 42 flows naturally along the bottom slope to the drain hole 47, drips onto the connecting plate 34, and flows precisely to the tip of the positioning rod 35 under the guidance of the inclined connecting plate 34, finally dripping precisely onto the defect on the cable surface, completing the positioning mark of the defect. When the cable defect is completely separated from the tip of the positioning rod 35, with the help of the metal elasticity of the positioning rod 35 itself and the restoring force of the spring 36, the positioning rod 35 can quickly reset and return to the initial state of contact with the outer surface of the cable, preparing for the next defect detection; the outer surface is mounted on the U-shaped mounting bracket 11 of the bending part 1. The bending component 12 and the inner bending component 13 form a loop bend in the cable using an '&' shaped winding method. This allows hidden or minute surface defects to naturally amplify due to the bending force. Simultaneously, the rotating connection of the rotating cylinder 122 reduces cable movement resistance. Combined with the flipping design during cable movement, this enables inspection of the entire cable surface without blind spots. Furthermore, four symmetrically distributed limiting components 2, using the threaded transmission of the threaded rod 23, adjust the fit between the abutment block 21 and the cable. This effectively limits lateral deviation and longitudinal runout during cable movement, while ensuring uniform force application that does not affect smooth cable transmission, thereby guaranteeing the stability and defect detection process. The effectiveness of the identification is achieved by using multiple sets of semi-circularly evenly distributed conical positioning rods 35 in the positioning component 3. Combined with the inherent metallic elasticity of the positioning rods 35, omnidirectional scanning coverage of the outer surface of the cable is realized. Utilizing the telescopic cooperation of the guide rods 33 and springs 36, it adapts to the detection needs of cables with different diameters, maintaining flexible contact between the positioning rods 35 and the cable surface at all times. This avoids damage to the cable and improves detection sensitivity. Simultaneously, it can synchronously follow the movement and trigger linkage when contacting defects. After defect separation, it relies on its own elasticity and the restoring force of the springs 36 to quickly return to the initial state, ensuring the continuity and accuracy of the detection and effectively avoiding omissions. In cases of false positives and false negatives, the design of the replenishment tank 41 of the storage component 4, which is connected to multiple sets of storage tanks 42, along with the inclined structure of the bottom of the storage tank 42 facing the mounting bracket 11, ensures sufficient storage of the marking liquid and allows for natural and smooth flow. Utilizing the one-to-one correspondence between the storage tanks 42 and the positioning components 3, combined with the linkage control of the plug 46 and the drain hole 47, the marking liquid is released only when a defect is detected, achieving on-demand supply and avoiding waste. Furthermore, the inclined guidance of the connecting plate 34 precisely directs the marking liquid to the tip of the positioning rod 35 and drips it onto the defect, making the defect marking clear and accurate, providing clear guidance for subsequent cable defect inspection and repair.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for detecting surface defects in cables, comprising: A bending member (1) for bending a cable into a ring shape, characterized in that the bending member (1) is provided with a limiting member (2) for limiting the cable, the bending member (1) is provided with a marking liquid storage member (4) for marking defects on the cable surface, and the storage member (4) is provided with a positioning member (3) for locating defects on the cable surface. The bending component (1) includes a U-shaped mounting bracket (11), on which an outer bending component (12) and an inner bending component (13) are provided. The outer bending component (12) and the inner bending component (13) are arranged in a 1-shape, and the outer bending component (12) and the inner bending component (13) have the same structure. The outer bending member (12) includes a mounting shaft (121) that passes through the side end of the mounting bracket (11). A rotating cylinder (122) is sleeved on the outer circular surface of the mounting shaft (121), and the rotating cylinder (122) is rotatably connected to the mounting shaft (121). The inner bending member (13) also includes a mounting shaft (121) and a rotating cylinder (122). The cable is wound in an '&' shape on the rotating drum (122) of the outer bending part (12) and the inner bending part (13). One end of the cable is connected to the winding device. Under the power traction of the winding device, the cable moves smoothly along the rotating drum (122) of the outer bending part (12) and the inner bending part (13). During the movement, the cable first adheres to one side of the rotating drum (122) of the outer bending part (12). When it continues to move to the rotating drum (122) of the inner bending part (13), the side that originally adhered to the rotating drum (122) of the outer bending part (12) will turn outward.

2. The detection device for cable surface defects according to claim 1, characterized in that, The limiting member (2) includes a threaded rod (23) that passes through the mounting frame (11) and is threadedly connected to the mounting frame (11). One end of the threaded rod (23) passes through the mounting frame (11) and is fixedly connected to a connecting block (22). An abutment block (21) is rotatably connected to the outside of the connecting block (22). A handle (24) is connected through the outer circular surface of the threaded rod (23) located on the outside of the mounting frame (11).

3. The detection device for cable surface defects according to claim 2, characterized in that, The limiting member (2) is provided in four groups, symmetrically distributed above the outer bending member (12) and below the inner bending member (13), to limit the cable wrapped on the outer bending member (12) and the inner bending member (13).

4. The detection device for cable surface defects according to claim 3, characterized in that, The positioning component (3) includes a mounting plate (31) fixedly connected to the bottom of the storage component (4). A moving groove (32) is provided through the mounting plate (31). A T-shaped guide rod (33) is connected through the moving groove (32). A T-shaped connecting plate (34) is fixedly connected to one end of the guide rod (33) away from the mounting plate (31). A positioning rod (35) is fixedly connected to one end of the connecting plate (34). The positioning rod (35) is conical, and its tip abuts against the outer surface of the cable. A spring (36) is sleeved on the outside of the guide rod (33). One end of the spring (36) abuts against the mounting plate (31), and the other end abuts against the connecting plate (34).

5. The detection device for cable surface defects according to claim 4, characterized in that, The positioning element (3) is provided in multiple sets, and is evenly distributed in a semi-circle at the bottom of the storage element (4). The positioning element (3) is in an inclined state, and the tip of the positioning rod (35) is the lowest point.

6. The detection device for cable surface defects according to claim 5, characterized in that, The storage component (4) includes a replenishment tank (41) fixedly connected to the mounting frame (11). The bottom end of the replenishment tank (41) is connected to a storage tank (42). Multiple sets of storage tanks (42) are provided, which are evenly distributed in a semi-circle at the bottom end of the replenishment tank (41). Each set of storage tanks (42) is provided with a set of positioning components (3). The bottom end of the storage tank (42) is a slope, and the side facing the mounting frame (11) is the lower end.

7. The detection device for cable surface defects according to claim 6, characterized in that, The connecting plate (34) has a convex-shaped adjustment groove (43) on its side. There are two sets of adjustment grooves (43) symmetrically distributed on both sides of the connecting plate (34). Each set of adjustment grooves (43) is slidably connected to a set of convex-shaped sliding blocks (44). One end of the sliding block (44) passes through the adjustment groove (43) and is fixedly connected to an extension plate (45). The top end of the extension plate (45) passes through the bottom end of the liquid storage tank (42) and is fixedly connected to a block (46). The block (46) is triangular in shape and its bottom end is flush with the bottom end of the liquid storage tank (42).

8. The detection device for cable surface defects according to claim 7, characterized in that, The bottom of the liquid storage tank (42) is connected to the bottom of the block (46) and a drain hole (47) is provided. The drain hole (47) is provided in multiple sets evenly distributed between the two sets of extension plates (45).

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