A cable bending resistance detection device

Abstract

This invention discloses a cable bending resistance testing device, mainly relating to the field of cable performance testing. It includes a base, a first stand, and a second stand. The top of the first stand has a rotating ring with a rotational stroke. A core tube, coaxial with the rotating ring, passes through the rotating ring. A vertical plate is fixed to the side wall of the rotating ring, and a linear guide rail is provided on the vertical plate. The length direction of the linear guide rail is consistent with the diameter of the rotating ring. A slider is slidably fitted on the linear guide rail, and a mounting plate is fixed on the slider. The mounting plate has a clamping mechanism and a pull cable fixed to the mounting plate, which tends to pull the slider away from the mounting ring. The top of the second stand has a clearance hole for the core tube to pass through, and the top of the second stand also has a clamping mechanism. The beneficial effect of this invention is that it can detect multiple 360-degree bends and coils of the cable core.

Description

Technical Field

[0001] This invention relates to the field of cable performance testing, specifically a cable bending resistance testing device. Background Technology

[0002] For cables, their ability to withstand various bends is one of the most important indicators for evaluating their performance. Cables with good bend resistance can avoid and reduce the probability of problems such as breakage, short circuits, and core breakage during use, ensuring power supply and operational safety, which is a necessary prerequisite for ensuring the normal operation of industrial production, machinery manufacturing, and construction electromechanical systems.

[0003] The core transmission component of a cable is its core wire, commonly made of aluminum alloy or copper. The core wire is made of aluminum alloy wire or oxygen-free copper wire twisted together, and covered by an outer sheath and filler. Testing the bending resistance of this core component is crucial.

[0004] Currently, there are many corresponding devices and methods for testing the bending resistance of core wires. Most of them involve repeatedly bending the core wire after fixing both ends to obtain the corresponding data. However, in applications, most cables are eventually rolled into coils, and some applications still require the cables to be coiled and stored. Some cables are also processed into spiral cables. Existing testing equipment can only detect 90-degree or 180-degree bends and cannot obtain corresponding data on the resistance to multiple turns of coiling. Summary of the Invention

[0005] The purpose of this invention is to provide a cable bending tolerance testing device, which has the corresponding detection function for multiple turns of 360-degree bending and winding of cable core.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A cable bending resistance testing device includes a base, on which a first frame and a second frame are vertically arranged side by side. The top of the first frame has a rotating ring with a rotational stroke. A core tube coaxial with the rotating ring passes through the rotating ring. A vertical plate is fixed to the side wall of the rotating ring. A linear guide rail is provided on the vertical plate, the length direction of which is consistent with the diameter of the rotating ring. A slider is slidably fitted on the linear guide rail. A mounting plate is fixed to the slider. A clamping mechanism is provided on the mounting plate. A pull cable is fixed to the mounting plate, and the pull cable has a tendency to pull the slider away from the mounting ring.

[0008] The top of the second support frame is provided with a clearance hole for the core tube to pass through, and the top of the second support frame is provided with a clamping mechanism.

[0009] The top of the first support frame is fixed with a lead screw and a slide table from top to bottom. A lead screw that cooperates with the lead screw passes through the lead screw and is horizontally arranged. An optical shaft that linearly slides through the slide table and is in cooperation with it is arranged vertically alongside the lead screw. Connecting strips are provided at both ends of the optical shaft. The top end of the connecting strip is rotatably connected to the lead screw, and the bottom end of the connecting strip is fixedly connected to the optical shaft. A motor is installed on a connecting strip away from the second support frame. A coaxial shaft is provided at the end of the lead screw away from the motor and is fixedly fixed to it. The coaxial shaft is located between the first and second supports. A rotating disk is fixed at the end of the coaxial shaft away from the lead screw, and a rotating ring is coaxially fixed on the rotating disk.

[0010] The rotating disk has a circular groove coaxial with the rotating disk on one end face near the second upright. A flange integrally formed with the groove is provided on the edge of the circular groove. A flange is fixed to one side edge of the rotating ring near the rotating disk. The flange on the rotating ring and the flange on the circular groove are fixed by bolts.

[0011] A socket with the same center as the circular groove is provided in the center of the circular groove. The socket is a multi-layer circular tube assembly with coaxial sleeves. Each layer of the socket has a different diameter. A core tube with a diameter adapted to the core tube is movably inserted into each layer of the socket. An external pin hole is provided on the side wall of the socket. An internal pin hole is provided at the corresponding position of the external pin hole after the core tube is inserted into the socket. A through hole corresponding to the position and diameter of the external pin hole is provided on the side wall of the circular groove. A pin is provided through the circular groove. The pin passes through the through hole, the external pin hole, and the internal pin hole in sequence. Both ends of the pin are threaded with a nut.

[0012] The clamping mechanism includes a fixed frame, within which a fixed clamping block and a movable clamping block are provided. The fixed clamping block is fixed to the inner wall of the fixed frame, and the movable clamping block slides linearly along the fixed frame. This linear sliding is a linear stroke relative to the fixed block, moving closer to or further away from it. A push rod is provided on the side of the movable clamping block away from the fixed clamping block. The fixed frame is provided with a threaded hole for the push rod to pass through and be threaded. A hexagonal groove is provided on the outer end face of the push rod.

[0013] The mounting plate has a hanging ring at the top center, and the upright plate has a mounting groove at the center of the end away from the rotating ring. A spool is provided in the mounting groove and is rotatably connected to it. A winding spring is provided between the spool and the mounting groove. The winding spring can be a torsion spring. One end of the cable is fixed to the hanging ring, and the upper part of the cable is wound around the spool.

[0014] The second upright has a mounting block fixedly connected to its top side. The mounting block has a horizontally extending through groove on the side near the first upright. The through groove has a plug that slides left and right with it. The plug can be removed from either end of the through groove. The top surface of the mounting block has a limiting hole that penetrates the through groove. The plug has a mating hole that coincides with the limiting hole. The mating hole has a pin. After the pin passes through a limiting hole and a mating hole, it fixes the position of the plug relative to the through groove.

[0015] The side of the insert block exposed outside the through slot is fixed with a horizontally extending connecting shaft, and one side wall of the fixing frame of the clamping mechanism located at the top of the second stand is rotatably connected to the connecting shaft.

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

[0017] It can detect multi-turn 360-degree bends and obtain fatigue test data through repeated winding and straightening. This overcomes the current situation where existing equipment lacks multi-turn winding testing capabilities and the lack of relevant model analysis gaps caused by the absence of such fatigue test models. It has significant implications for the testing and research of cable performance. Attached Figure Description

[0018] Figure 1 This is a side view of the present invention (in standby mode).

[0019] Figure 2 This is the present invention. Figure 1 A schematic diagram of the top structure.

[0020] Figure 3 This is the invention Figure 1 A schematic diagram of the overall structure.

[0021] Figure 4 This is the present invention. Figure 2 A schematic diagram of component breakdown.

[0022] Figure 5 This is a schematic diagram of the test state of the present invention (the rotating ring cannot rotate when it moves away from the second support).

[0023] Figure 6 This is a schematic diagram of the structure at the top of the second support frame of the present invention.

[0024] Figure 7 This is a schematic diagram of the assembly of the rotating ring and the rotating disk of the present invention.

[0025] The labels shown in the attached diagram:

[0026] 1. Base; 2. First upright; 3. Second upright; 4. Nut; 5. Slide table; 6. Lead screw; 7. Optical shaft; 8. Connecting strip; 9. Motor; 10. Corresponding shaft; 11. Rotating disk; 12. Circular groove; 13. Flange; 14. Rotating ring; 15. Inner socket; 16. Middle socket; 17. Outer socket; 18. Core tube; 19. Through hole; 20. Outer pin hole; 21. Inner pin hole; 22. Pin rod; 23. Upright plate; 24. Linear guide rail; 25. Slider; 26. Mounting plate; 27. Clamping mechanism; 28. Fixed frame; 29. ​​Movable clamping block; 30. Fixed clamping block; 31. Top rod; 32. Slot; 33. Hanging ring; 34. Threaded wheel; 35. Clearance hole; 36. Mounting block; 37. Through groove; 38. Insertion block; 39. Limiting hole; 40. Connecting shaft. Detailed Implementation

[0027] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0028] Unless otherwise specified, the instruments, reagents, and materials used in the following embodiments are all conventional instruments, reagents, and materials already available in the prior art and can be obtained through legitimate commercial channels. Unless otherwise specified, the experimental methods and detection methods used in the following embodiments are all conventional experimental methods and detection methods already available in the prior art.

[0029] Example 1:

[0030] After cables are produced into coils and spools, they may undergo long periods of storage and transportation. In application, long cables and spools often need to be unwound and rolled up for use. Therefore, it is essential to test the cable's ability to withstand repeated multi-turn winding.

[0031] Most existing common testing machines directly bend and flex the wire core, and the operation is completed within a single vertical plane. Even after repeated wrapping, the curvature of the later wrapping will be significantly greater than that of the earlier wrapping, resulting in inconsistent bending effects on each segment of the wire core during the testing process, which will lead to inaccurate test results.

[0032] This testing equipment is a cable bending resistance testing device. Within the scope of bending resistance testing, it focuses on the 360-degree bending capability of the wire core.

[0033] The main structure of this device includes:

[0034] Base 1, which is used to place on an operating table or any flat surface that can be tested, such as the ground.

[0035] The base 1 is elongated, with a second support 3 fixed at one end and a first support 2 fixed at the other end.

[0036] The top of the first support frame 2 is fixed with a lead screw 4 and a slide table 5 from top to bottom. A lead screw 6, which cooperates with the lead screw 4, passes through the lead screw 4 and is horizontally arranged. An optical axis 7, which is linearly slidably cooperates with the slide table 5, passes through the slide table 5 and is arranged vertically alongside the lead screw 6. Connecting strips 8 are provided at both ends of the optical axis 7. The top end of the connecting strip 8 is rotatably connected to the lead screw 6, and the bottom end of the connecting strip 8 is fixedly connected to the optical axis 7. Based on the fixing of the lead screw 6 and the optical axis 7 by the connecting strips 8, the connecting strips 8, the lead screw 6, and the optical axis 7 constitute a translation frame that can move linearly parallel to the first support frame 2.

[0037] A motor 9 is mounted on a connecting bar 8 located away from the second upright 3. The output shaft of the motor 9 is connected and fixed to a lead screw 6. This motor drives the lead screw 6 to rotate, and based on the fixing of the lead screw nut 4, it enables the movement of the above translation frame.

[0038] The lead screw 6 is provided with a coaxial shaft 10 at the end away from the motor 9. The coaxial shaft 10 is located between the first support 2 and the second support 3. A rotating disk 11 is fixed at the end of the coaxial shaft 10 away from the lead screw 6. A circular groove 12 coaxial with the rotating disk 11 is provided on the end face of the rotating disk 11 near the second support 3. A flange 13 integrally formed with the rotating disk 12 is provided on the edge of the circular groove 12. A rotating ring 14 is fixedly installed on the side of the rotating disk 11 near the second support 3. The rotating ring 14 is coaxial with the rotating disk 11 and has the same diameter. The flange 13 is fixed on the edge of the rotating ring 14 near the rotating disk 11. The flange 13 on the rotating ring 14 and the flange 13 on the opening of the circular groove 12 are detachably fixed by bolts.

[0039] In the above structure, the rotating disk 11 is fixed to the lead screw 6. Therefore, the lead screw 6 can rotate and translate synchronously, thus achieving a motion trajectory that rotates and translates at the same time.

[0040] A socket with the same center as the circular groove 12 is provided in the center. The socket is a multi-layered circular tube assembly with coaxial sleeves. This example gives an example of a three-layered tubular socket. The sockets are, from the inside out, an inner socket 15, a middle socket 16, and an outer socket 17, which are used to connect with core tubes 18 of different thicknesses. The inner diameter of the core tube 18 corresponds to the outer diameter of the insertion tube, so there are three types of core tubes 18: large core tube 18, medium core tube 18, and thin core tube 18.

[0041] The core tube 18 can be directly inserted into the corresponding socket, achieving coaxial positioning of the core tube 18 relative to the circular groove 12. Simultaneously, an external pin hole 20 is provided on the side wall of the socket, and an internal pin hole 21 is provided at the corresponding position of the external pin hole 20 after the core tube 18 is inserted into the socket. When the core tube 18 is inserted into the socket, the external pin hole 20 and the internal pin hole 21 can be aligned. A through hole 19 corresponding to the position and diameter of the external pin hole 20 is provided on the side wall of the circular groove 12. A pin 22 is inserted through the circular groove 12 to fix the core tube 18. Both ends of the pin 22 are provided with external threads. The pin 22 sequentially passes through the through hole 19, external pin hole 20, internal pin hole 21, internal pin hole 21, external pin hole 20, and through hole 19. The pin 22 is installed and fixed on the rotating disk 11 by using nuts at both ends. The core tube 18 can be replaced by removing the nuts.

[0042] A vertical plate 23 is fixed on the rotating ring 14. The vertical plate 23 is a long strip-shaped flat plate structure. A linear guide rail 24 is provided in the center of the end face of the vertical plate 23 near the second support 3. The length direction of the linear guide rail 24 is consistent with the diameter of the rotating ring 14. A slider 25 is slidably fitted on the linear guide rail 24. A mounting plate 26 is fixed on the slider 25. A clamping mechanism 27 is provided on the mounting plate 26. The clamping mechanism 27 is used to clamp and fix one end of the cable.

[0043] The clamping mechanism 27 includes a fixed frame 28, which is a rectangular plate frame structure. The fixed frame 28 contains a fixed clamping block 30 and a movable clamping block 29. Both the movable clamping block 29 and the fixed clamping block 30 are rubber blocks, but are not limited to this example; they can also be metal or plastic blocks. The fixed clamping block 30 is fixed to the inner wall of the fixed frame 28. The outer side of the movable clamping block 29 has a slot that slides against the side wall of the fixed frame 28. A push rod 31 is located on the side of the movable clamping block 29 away from the fixed clamping block 30. The fixed frame 28 has a threaded hole through which the push rod 31 passes, and the end of the push rod 31 near the movable clamping block 29 is rotatably connected to the movable clamping block 29. A hexagonal countersunk groove 32 is located on the outer end face of the push rod 31 for easy control with a wrench. By rotating the push rod 31, the distance between the movable clamping block 29 and the fixed clamping block 30 can be adjusted, thereby firmly clamping the cable core wire located between them.

[0044] A hanging ring 33 is centrally located at the top of the mounting plate 26. A cable is fixed to the hanging ring 33. A mounting groove is centrally located at the end of the upright plate 23 away from the rotating ring 14. A rotatable reel 34 is located in the mounting groove and is rotatably connected to it. A winding spring, which can be a torsion spring, is provided between the reel 34 and the mounting groove to give the reel 34 an elastic force to wind up the cable. The cable is wound around the reel 34. The cable, which has a continuous upward winding force, is used to straighten the cable.

[0045] The upper part of the second support frame 3 is provided with a clearance hole 35 coaxial with the rotating disk 11. The top side of the second support frame 3 is provided with a mounting block 36 fixedly connected thereto. The mounting block 36 is provided with a horizontally extending through groove 37 on the side near the first support frame 2. The through groove 37 is provided with a plug 38 that slides left and right with it. The plug 38 can be removed from either end of the through groove 37. The top surface of the mounting block 36 is provided with a limiting hole 39 that penetrates the through groove 37. The plug 38 is provided with a mating hole that can coincide with the limiting hole 39. A pin is provided in the mating hole. After the pin passes through a limiting hole 39 and the mating hole, the position of the plug 38 relative to the through groove 37 is fixed.

[0046] The insert 38 is fixed with a horizontally extending connecting shaft 40 on the side exposed outside the through groove 37. A clamping mechanism 27 is rotatably connected to the connecting shaft 40. The clamping mechanism 27 is the clamping mechanism 27 described above, and one side wall of the fixing frame 28 is rotatably connected to the connecting shaft 40.

[0047] The method of using this device is as follows: after fixing the rotating ring 14 to the rotating disk 11, the motor 9 drives the lead screw 6 to rotate, thereby driving the rotating disk 11 to rotate. At the same time, with the cooperation of the lead screw nut 4, the translation frame moves in a straight line, realizing the spiral running trajectory of the upright plate 23 moving away from the second upright 3 while rotating.

[0048] Based on this device, the completed detection steps are as follows:

[0049] s1, fix one end of the target core wire to the clamping mechanism 27 at the top of the second stand 3, and fix the other end to the clamping mechanism 27 on the stand plate 23. Under the elastic pulling action of the cable, the cable is straightened. Since the clamping mechanism 27 on the second stand 3 can rotate, the root of the core wire is avoided from being folded.

[0050] S2, start motor 9, so that the originally adjacent upright plate 23 and second upright frame 3 gradually move away from each other under the spiral stroke of upright plate 23. At the same time, as upright plate 23 rotates, the core wire is wound around the core tube 18 in a spiral state.

[0051] s3, start motor 9 to run in reverse, stand plate 23 rotates in the opposite direction relative to s2 and approaches the second stand 3, gradually unwinding and resetting the wire core that was spirally wound on the core tube 18 in s2.

[0052] Repeat the above steps s2-s3 a certain number of times.

[0053] This method can perform uniform testing on multiple 360-degree bends and obtain fatigue test data by repeatedly winding and straightening.

[0054] During the above testing process, the wire core rotates along with the rotation of the upright plate 23, moving away from the second upright 3 as it rotates, thus causing the wire core to be wound in a spiral state on the core tube 18. This winding method ensures that the obtained coil always has the same diameter, and the bending influence on each section of the wire core is completely consistent. There is no situation where the outer layer has a larger winding arc and the inner layer has a smaller winding arc, thereby achieving a 360-degree bending test on the entire section of the core wire without any difference.

[0055] During the initial winding, since the clamping mechanism 27 on the second stand 3 can rotate and adjust its angle freely, as the stand plate 23 rotates, it automatically adjusts to the appropriate angle for the wire core to be wound on the core tube 18, thus avoiding folding at the root of the cable.

[0056] The detachable connection between the rotating ring 14 and the rotating disk 11 via the flange 13 allows for the selection of an appropriate length of upright plate 23, and also facilitates the testing of core wires of corresponding lengths. Simultaneously, core tubes 18 of varying thicknesses can be used to test the resistance to different curvatures during a 360° winding and bending test. This results in more comprehensive test data, meeting the needs of different performance observations. Furthermore, the core tube 18 remains synchronized with the rotating ring 14, ensuring that it always provides internal support for the core wire winding between the first upright 2 and the second upright 3.

Claims

1. A cable bending endurance testing device, characterized in that, The device includes a base on which a first and a second upright are arranged vertically side by side. The top of the first upright has a rotating ring with a rotational stroke. A core tube, coaxial with the rotating ring, passes through the rotating ring. A vertical plate is fixed to the side wall of the rotating ring, and a linear guide rail is provided on the vertical plate. The length direction of the linear guide rail is consistent with the diameter of the rotating ring. A slider is slidably fitted on the linear guide rail. A mounting plate is fixed to the slider, and a clamping mechanism is provided on the mounting plate. A pull cable is fixed to the mounting plate, and the pull cable tends to pull the slider away from the mounting ring. The top of the second upright has a clearance hole for the core tube to pass through, and the top of the second upright also has a clamping mechanism. The top of the first support frame is fixed with a lead screw and a slide table from top to bottom. A lead screw that cooperates with the lead screw passes through the lead screw and is horizontally arranged. An optical shaft that linearly slides through the slide table and is in cooperation with it is arranged vertically alongside the lead screw. Connecting strips are provided at both ends of the optical shaft. The top end of the connecting strip is rotatably connected to the lead screw, and the bottom end of the connecting strip is fixedly connected to the optical shaft. A motor is installed on a connecting strip away from the second support frame. A coaxial shaft is provided at the end of the lead screw away from the motor and is fixedly fixed to it. The coaxial shaft is located between the first and second supports. A rotating disk is fixed at the end of the coaxial shaft away from the lead screw, and a rotating ring is coaxially fixed on the rotating disk.

2. The cable bending endurance testing device according to claim 1, characterized in that, The rotating disk has a circular groove coaxial with the rotating disk on one end face near the second upright. A flange integrally formed with the groove is provided on the edge of the circular groove. A flange is fixed to one side edge of the rotating ring near the rotating disk. The flange on the rotating ring and the flange on the circular groove are fixed by bolts.

3. The cable bending endurance testing device according to claim 2, characterized in that, A socket with the same center as the circular groove is provided in the center of the circular groove. The socket is a multi-layer circular tube assembly with coaxial sleeves. Each layer of the socket has a different diameter. A core tube with a diameter adapted to the core tube is movably inserted into each layer of the socket. An external pin hole is provided on the side wall of the socket. An internal pin hole is provided at the corresponding position of the external pin hole after the core tube is inserted into the socket. A through hole corresponding to the position and diameter of the external pin hole is provided on the side wall of the circular groove. A pin is provided through the circular groove. The pin passes through the through hole, the external pin hole, and the internal pin hole in sequence. Both ends of the pin are threaded with a nut.

4. The cable bending endurance testing device according to claim 1, characterized in that, The clamping mechanism includes a fixed frame, within which a fixed clamping block and a movable clamping block are provided. The fixed clamping block is fixed to the inner wall of the fixed frame, and the movable clamping block slides linearly along the fixed frame. This linear sliding is a linear stroke relative to the fixed block, moving closer to or further away from it. A push rod is provided on the side of the movable clamping block away from the fixed clamping block. The fixed frame is provided with a threaded hole for the push rod to pass through and be threaded. A hexagonal groove is provided on the outer end face of the push rod.

5. The cable bending endurance testing device according to claim 1, characterized in that, The mounting plate has a hanging ring at the top center, and the upright plate has a mounting groove at the center of the end away from the rotating ring. A spool is provided in the mounting groove and is rotatably connected to it. A winding spring is provided between the spool and the mounting groove. The winding spring is a torsion spring. One end of the cable is fixed to the hanging ring, and the upper part of the cable is wound around the spool.

6. The cable bending endurance testing device according to claim 4, characterized in that, The second upright has a mounting block fixedly connected to its top side. The mounting block has a horizontally extending through groove on the side near the first upright. The through groove has a plug that slides left and right with it. The plug can be removed from either end of the through groove. The top surface of the mounting block has a limiting hole that penetrates the through groove. The plug has a mating hole that coincides with the limiting hole. The mating hole has a pin. After the pin passes through a limiting hole and a mating hole, it fixes the position of the plug relative to the through groove.

7. The cable bending endurance testing device according to claim 6, characterized in that, The side of the insert block exposed outside the through slot is fixed with a horizontally extending connecting shaft, and one side wall of the fixing frame of the clamping mechanism located at the top of the second stand is rotatably connected to the connecting shaft.

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