A device and method for cable tensile performance testing

Abstract

This invention discloses an apparatus and method for testing the tensile strength of cables, relating to the field of cable tensile strength testing technology. The testing apparatus includes a vertically arranged mounting carrier and two clamping members disposed on the mounting carrier. The two clamping members are respectively used to clamp both ends of a long cable. Two sets of traction wheel groups are disposed on the mounting carrier, located on the upper and lower sides of the clamping members, respectively. A driving unit is disposed on the mounting carrier, configured to move the two sets of traction wheel groups relative to each other, causing the traction wheel groups to lift the middle section of the long cable along the vertical direction of the mounting carrier, and applying tension to the long cable after tensioning. Through the arrangement of multiple sets of traction wheel groups, the cable can pass through multiple traction wheel groups multiple times, forming multiple tensioned sections, realizing multi-point tensile strength testing of the long cable, increasing the detectable length of the cable, and improving cable testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of cable tensile performance testing technology, specifically to an apparatus and method for testing the tensile performance of cables. Background Technology

[0002] As a core component for power transmission and signal transmission, the tensile mechanical properties of cables are crucial indicators for ensuring stable service under conditions such as laying, long-term suspension, and external tension. Currently, cable tensile performance testing is generally performed using tensile testing machines. However, due to space limitations, existing tensile testing machines can only perform single-point tensile testing on small cable sections, and cannot perform overall tensile performance testing on long cables. In practical applications, the stress characteristics of the entire cable differ significantly from those of a small section, and the testing of a small section cannot reflect the tensile performance of the entire cable.

[0003] Chinese patent application CN118464633B discloses a device and method for testing the tensile properties of cables. The device includes a tensile testing unit for testing the tensile strength of cables and a control unit connected to the tensile testing unit for displaying test results and controlling the testing process. A clamping assembly for holding the cable body is provided below the fixed plate. The clamping assembly includes a clamping plate fixed to one end of a fixed post for clamping the cable body, and a rubber sheet fixed inside the clamping plate, with one side of the rubber sheet abutting against the cable body. While this application can test long cables, it essentially tests the long cable in segments. Testing a whole long cable requires repeated operations, resulting in low testing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for testing the tensile properties of cables, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for testing the tensile strength of cables, comprising a vertically arranged mounting carrier and two clamping members disposed on the mounting carrier; the two clamping members are respectively used to clamp both ends of a long cable; two sets of traction wheel sets are disposed on the mounting carrier; the two sets of traction wheel sets are respectively located on the upper and lower sides of the clamping members; a driving unit is disposed on the mounting carrier, the driving unit being configured to move the two sets of traction wheel sets relative to each other, causing the traction wheel sets to drive the middle section of the long cable to be lifted along the vertical direction of the mounting carrier, and to apply tension to the long cable after the long cable is tensioned.

[0006] As a further embodiment of the present invention, the clamping member includes an upper clamping plate, a lower clamping plate, and a pressing part, wherein a clamping groove for accommodating a cable is formed between the upper clamping plate and the lower clamping plate; the pressing part is configured to bring the upper clamping plate and the lower clamping plate closer to each other, thereby reducing the opening of the clamping groove to clamp the cable.

[0007] As a further embodiment of the present invention, the upper clamping plate and the lower clamping plate are integrally formed, and the clamping groove is U-shaped.

[0008] As a further aspect of the present invention, the inner wall of the clamping groove is provided with a friction element for increasing the contact area between the clamping groove and the cable.

[0009] As a further embodiment of the present invention, the extrusion part includes a fastening bolt and a nut, the fastening bolt and the nut being threadedly engaged, one of the fastening bolt and the nut being disposed on the upper clamping plate and the other being disposed on the lower clamping plate.

[0010] As a further embodiment of the present invention, one of the clamping members is provided with a slider, which slides in cooperation with the mounting carrier; the mounting carrier is provided with a traction mechanism, which is configured to cause the slider to drive the clamping member to pass between two sets of traction wheels.

[0011] The traction mechanism includes a traction rope and a winding roller for winding the traction rope; one end of the traction rope is fixed to a slider; the winding roller is rotatably mounted on the mounting carrier and is connected to a motor for driving its rotation.

[0012] As a further embodiment of the present invention, another clamping member is provided with a second slider, which is slidably engaged with the mounting carrier. The sliding directions of the second slider and the first slider are orthogonal. The second slider is provided with a linear drive member for driving its displacement in the vertical direction.

[0013] As a further embodiment of the present invention, one of the two sets of traction wheel sets is fixed relative to the mounting carrier, and the other is slidably engaged with the mounting carrier; each traction wheel set includes at least one pulley and a fixing block for mounting the pulley; one of the fixing blocks is fixed to the mounting carrier, and the other fixing block is slidably engaged with the mounting carrier.

[0014] As a further embodiment of the present invention, the driving unit includes a threaded rod rotatably mounted on the mounting carrier and a slide table threadedly engaged with the threaded rod; the slide table is fixedly mounted on a fixed block that slidably engages with the mounting carrier; and the threaded rod is driven by a second motor for driving its rotation.

[0015] A method for testing the tensile strength of cables, the method comprising the following steps:

[0016] Step 1: Place both ends of the long cable into the two clamps respectively, and clamp the two ends of the long cable tightly;

[0017] Step 2: The drive unit drives the two sets of traction wheel sets to move relative to each other along the height direction of the installation carrier, and the traction wheel sets drive the middle section of the cable to be lifted and tensioned;

[0018] Step 3: The drive unit drives the traction wheel set to continue moving and apply tension to the cable until the tension reaches the predetermined value, thus completing the cable tensile performance test.

[0019] Step 4: Remove the tested cable from the clamp.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The vertically arranged mounting carrier of this invention makes full use of vertical space. The two ends of a long cable are clamped by clamping components, and then two sets of traction wheels lift the middle section of the cable along the vertical direction of the mounting carrier to tension the cable. This allows for overall tensile performance testing of the entire long cable. Furthermore, the direction of tension on the cable is consistent with the direction of gravity, avoiding bending stress caused by its own weight and preventing localized stress concentration. Simultaneously, the arrangement of multiple traction wheels allows the cable to pass through multiple traction wheel sets multiple times, forming multiple tension sections, enabling multi-point tensile testing of long cables, increasing the detectable length of the cable, and improving cable testing efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the clamping component structure of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the overall structure of the present invention;

[0025] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0026] Figure 5 for Figure 3 Enlarged view of a section at point B in the middle;

[0027] Figure 6 This is a schematic diagram of the traction wheel assembly structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the driving unit structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the motor and transmission structure of the present invention;

[0030] Figure 9This is a schematic diagram of the traction wheel assembly, mounting base, and slide structure of the present invention;

[0031] Figure 10 This is a schematic diagram of the first working state of the present invention;

[0032] Figure 11 This is a schematic diagram of the second working state of the present invention.

[0033] The attached figures are labeled as follows:

[0034] 10-Installation carrier, 20-Clamping component, 21-Upper clamping plate, 22-Lower clamping plate, 23-Clamping groove, 241-Fasting bolt, 242-Nut, 25-Slider one, 261-Traction rope, 262-Rewinding roller, 263-Motor one, 27-Slider two, 28-Friction component, 30-Traction wheel set, 31-Pulley, 32-Fixing block, 33-Mounting seat, 41-Threaded rod, 42-Slide table, 43-Motor two, 44-Pulley one, 45-Pulley two, 46-Transmission belt. Detailed Implementation

[0035] 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.

[0036] Please see Figures 1-11 This invention provides a technical solution: a device for testing the tensile strength of cables, comprising a vertically arranged mounting carrier 10 and two clamping members 20 disposed on the mounting carrier 10; the two clamping members 20 are respectively used to clamp the two ends of a long cable; two sets of traction wheel sets 30 are disposed on the mounting carrier 10; the two sets of traction wheel sets 30 are respectively located on the upper and lower sides of the clamping members 20; a driving unit is disposed on the mounting carrier 10, the driving unit being configured to move the two sets of traction wheel sets 30 relative to each other, causing the traction wheel sets 30 to drive the middle section of the long cable to be lifted along the vertical direction of the mounting carrier 10, and to apply tension to the long cable after the long cable is tensioned.

[0037] refer to Figure 10One end of the long cable is passed through the right clamp 20 and pulled to the left clamp 20 for fixation. At this time, the left end of the cable is fixed by the left clamp 20, and the right end only passes through the right clamp 20. The middle section of the cable is located between the two sets of traction wheel groups 30. Then, the drive unit drives the two sets of traction wheel groups 30 to move relative to each other in the vertical direction along the mounting carrier 10, causing the middle section of the cable to move upward and / or downward in the vertical direction until the length of the right end of the cable extending outside the clamp 20 is less than 10cm. The drive unit then stops working, and the right clamp 20 fixes the right end of the cable. Then, the drive unit drives the traction wheel group 30 to continue moving, so that the cable is straightened and tensioned, ensuring that the entire length of the cable is in a uniform pre-tension state. Then, the drive unit continues to control the relative movement of the two sets of traction wheel groups, applying vertical tension to the cable through the traction wheel group 30. Since both ends of the cable are fixed by the clamps at this time, the displacement of the traction wheel group can be converted into tension on the entire cable, achieving uniform stretching of the entire long cable. Figure 11 To enable multi-point tensile testing of long cables, each traction wheel group 30 is equipped with multiple traction wheel groups 30. The cable can be wound around multiple traction wheel groups 30 multiple times to form multiple tensile sections, thereby enabling multi-point tensile testing of long cables and increasing the detectable length of the cable.

[0038] The mounting carrier 10 of this invention is vertically arranged, which can make full use of vertical space. The two ends of the long cable are clamped by the clamping member 20, and then the two sets of traction wheel groups 30 drive the middle section of the cable to be lifted along the vertical direction of the mounting carrier 10 to tension the cable. This can realize the overall tensile performance test of the entire long cable. Moreover, the direction of cable tension is consistent with the direction of gravity, which can avoid bending stress caused by self-weight sagging and avoid local stress concentration. At the same time, through the arrangement of multiple sets of traction wheel groups 30, the cable can be wound around multiple traction wheel groups 30 multiple times to form multiple tension sections, realize multi-point tensile force test of long cables, increase the detectable length of the cable, and improve the cable test efficiency.

[0039] Specifically, such as Figure 2 As shown, the clamping member 20 includes an upper clamping plate 21, a lower clamping plate 22, and a pressing part. A clamping groove 23 for accommodating a cable is formed between the upper clamping plate 21 and the lower clamping plate 22. The pressing part is configured to bring the upper clamping plate 21 and the lower clamping plate 22 closer to each other, thereby narrowing the opening of the clamping groove 23 to clamp the cable. When fixing the cable, the end of the cable can be inserted into the clamping groove 23, and then the pressing part narrows the opening of the clamping groove 23 to clamp the cable, which can facilitate the installation and fixing of the cable. In this embodiment, the upper clamping plate 21 and the lower clamping plate 22 can be connected by a hinge structure.

[0040] Specifically, such as Figure 2As shown, the upper clamping plate 21 and the lower clamping plate 22 are integrally formed, and the clamping groove 23 is U-shaped. The integrally formed upper clamping plate 21 and lower clamping plate 22, together with the clamping groove 23, can form an integral flexible hinge structure. There are no hinges, pins or other moving connection points, resulting in higher overall structural strength. During the cable tension process, the stress can be evenly distributed throughout the clamping component, avoiding the risk of stress concentration, wear and loosening or even breakage at the hinge. This effectively improves the load-bearing capacity and reliability of the clamping component, avoids the risk of slippage, and is more suitable for high tensile testing conditions.

[0041] Specifically, such as Figure 2 As shown, the inner wall of the clamping groove 23 is provided with a friction element 28 for increasing the contact area between the clamping groove 23 and the cable. When a large clamping force is applied, the flexible friction element 28 can adapt to the irregular cross-section of the cable end (such as multi-strand stranded wire core), completely wrapping the cable surface, which can increase the contact area between the clamping groove 23 and the cable, improve the friction coefficient between the clamping groove 23 and the cable surface, and, together with the U-shaped groove structure, effectively prevent the cable from slipping under large tensile force, ensure that the tensile force can be completely transmitted to the cable body, and avoid the distortion of test data or test failure caused by slippage.

[0042] Specifically, such as Figure 2 As shown, the extrusion part includes a fastening bolt 241 and a nut 242, which are threaded together. One of the fastening bolt 241 and the nut 242 is located on the upper clamping plate 21, and the other is located on the lower clamping plate 22. By rotating the fastening bolt 241 and the nut 242, the open ends of the upper clamping plate 21 and the lower clamping plate 22 can be brought closer to each other, the opening of the clamping groove 23 is reduced, and a stable clamping force is applied to the cable.

[0043] Specifically, such as Figures 3-5 As shown, one of the clamping members 20 is provided with a slider 25, which slides in cooperation with the mounting carrier 10; the mounting carrier 10 is provided with a traction mechanism, which is configured to cause the slider 25 to drive the clamping member 20 to pass between two sets of traction wheel sets 30; the traction mechanism includes a traction rope 261 and a winding roller 262 for winding the traction rope 261; one end of the traction rope 261 is fixed to the slider 25; the winding roller 262 is rotatably mounted on the mounting carrier 10 and is driven by a motor 263 for driving its rotation; considering that the entire long cable is heavy, it is difficult to manually pull the cable from the right clamping member 20 to the left clamping member 20, therefore, as Figure 3As shown, in this embodiment, both clamping members 20 are positioned on the right side of the mounting carrier 10, and both clamping members 20 are located between the two sets of traction wheel sets 30. When installing the cable, simply pass one end of the cable through the right clamping member 20 and fix it to the left clamping member 20. Then, the motor 263 drives the winding roller 262 to rotate and wind up the traction rope 261, causing the traction rope 261 to move the slider 25 and the left clamping member 20 to the left. The slider 25 drives the clamping member 20 and one end of the cable to pass through the two sets of traction wheel sets 30, which can effectively reduce the difficulty of fixing the cable. After the clamping member 20 moves to the left... Figure 10 As shown in the image; Motor 263 has stopped working.

[0044] Specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, another clamping member 20 is provided with a second slider 27, which is slidably engaged with the mounting carrier 10. The sliding directions of the second slider 27 and the first slider 25 are orthogonal. The second slider 27 is provided with a linear drive for driving its displacement in the vertical direction. The second slider 27 is mounted on the clamping member 20 on the right side. The linear drive mechanism can drive the second slider 27 to move the clamping member 20 on the right side in the vertical direction. The clamping member 20 can drive one end of the cable to move synchronously, thereby changing the contact point between the cable and the traction wheel set, and realizing the tensile force test at different positions on the cable.

[0045] Specifically, such as Figure 6 , Figure 10 and Figure 11 As shown, one of the two sets of traction wheel assemblies 30 is fixed relative to the mounting carrier 10, and the other is slidably engaged with the mounting carrier 10; each traction wheel assembly 30 includes at least one pulley 31 and a fixing block 32 for mounting the pulley 31; one of the fixing blocks 32 is fixed to the mounting carrier 10, and the other fixing block 32 is slidably engaged with the mounting carrier 10; Reference Figure 10 The upper traction wheel assembly 30 is fixed relative to the mounting carrier 10, while the lower traction wheel assembly 30 can slide on the mounting carrier 10. The number of pulleys 31 in the traction wheel assembly 30 fixed relative to the mounting carrier 10 is one more than the number of pulleys 31 in the traction wheel assembly 30 that slides with the mounting carrier 10. This allows the cable to form a multi-span bypass path between the traction wheel assemblies 30, ensuring a smooth transition at both ends of the cable and avoiding stress concentration due to bending.

[0046] Specifically, such as Figures 7-9As shown, the drive unit includes a threaded rod 41 rotatably mounted on the mounting carrier 10 and a slide 42 threadedly engaged with the threaded rod 41; the slide 42 is fixedly mounted on a fixed block 32 that slidably engages with the mounting carrier 10; the threaded rod 41 is driven by a second motor 43 for driving its rotation; the second motor 43 can transmit power to the threaded rod 41 through a first pulley 44, a second pulley 45 and a transmission belt 46, and the rotation of the threaded rod 41 can drive the slide 42 to move in the vertical direction; when multiple pulleys 31 that slidably engage with the mounting carrier 10 are provided, multiple fixed blocks 32 are relatively fixed by mounting bases 33, and the slide 42 is fixed to the mounting bases 33.

[0047] A method for testing the tensile strength of cables, the method comprising the following steps:

[0048] Step 1: Place both ends of the long cable into the two clamping pieces 20 respectively, and clamp the two ends of the long cable tightly with the clamping pieces 20;

[0049] Step 2: The drive unit drives the two sets of traction wheel sets 30 to move relative to each other along the height direction of the mounting carrier 10. The traction wheel sets 30 drive the middle section of the cable to be lifted and tensioned.

[0050] Step 3: The drive unit drives the traction wheel group 30 to continue moving and apply tension to the cable until the tension reaches the predetermined value, thus completing the cable tensile performance test.

[0051] Step 4: Remove the tested cable from the clamp 20.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the tensile strength of cables, characterized in that: The device includes a vertically arranged mounting carrier (10) and two clamping members (20) disposed on the mounting carrier (10); the two clamping members (20) are respectively used to clamp the two ends of the long cable; the mounting carrier (10) is provided with two sets of traction wheel sets (30); the two sets of traction wheel sets (30) are respectively located on the upper and lower sides of the clamping members (20); the mounting carrier (10) is provided with a drive unit, which is configured to make the two sets of traction wheel sets (30) move relative to each other, so that the traction wheel sets (30) drive the middle section of the long cable to be lifted in the vertical direction along the mounting carrier (10), and apply tension to the long cable after the long cable is tensioned.

2. The device for testing the tensile strength of cables according to claim 1, characterized in that: The clamping member (20) includes an upper clamping plate (21), a lower clamping plate (22), and a pressing part. A clamping groove (23) for accommodating a cable is formed between the upper clamping plate (21) and the lower clamping plate (22). The pressing part is configured to bring the upper clamping plate (21) and the lower clamping plate (22) closer to each other, thereby narrowing the opening of the clamping groove (23) to clamp the cable.

3. The device for testing the tensile strength of cables according to claim 2, characterized in that: The upper clamping plate (21) and the lower clamping plate (22) are integrally formed, and the clamping groove (23) is U-shaped.

4. The device for testing the tensile properties of cables according to claim 2, characterized in that: The inner wall of the clamping groove (23) is provided with a friction element (28) for increasing the contact area between the clamping groove (23) and the cable.

5. The device for testing the tensile strength of cables according to claim 2, characterized in that: The extrusion part includes a fastening bolt (241) and a nut (242), which are threaded together. One of the fastening bolt (241) and the nut (242) is located on the upper clamping plate (21), and the other is located on the lower clamping plate (22).

6. The device for testing the tensile strength of cables according to claim 1, characterized in that: One of the clamping members (20) is provided with a slider (25), which is slidably engaged with the mounting carrier (10); the mounting carrier (10) is provided with a traction mechanism, which is configured to cause the slider (25) to drive the clamping member (20) to pass between the two sets of traction wheel sets (30); The traction mechanism includes a traction rope (261) and a winding roller (262) for winding the traction rope (261); one end of the traction rope (261) is fixed to a slider (25); the winding roller (262) is rotatably mounted on the mounting carrier (10) and is connected to a motor (263) for driving its rotation.

7. The device for testing the tensile strength of cables according to claim 6, characterized in that: Another clamping member (20) is provided with a second slider (27), which is slidably engaged with the mounting carrier (10). The sliding directions of the second slider (27) and the first slider (25) are orthogonal. The second slider (27) is provided with a linear drive for driving its displacement in the vertical direction.

8. The device for testing the tensile strength of cables according to claim 1, characterized in that: One of the two sets of traction wheel sets (30) is fixed relative to the mounting carrier (10), and the other is slidably engaged with the mounting carrier (10); each of the traction wheel sets (30) includes at least one pulley (31) and a fixing block (32) for mounting the pulley (31); one of the fixing blocks (32) is fixed to the mounting carrier (10), and the other fixing block (32) is slidably engaged with the mounting carrier (10).

9. The device for testing the tensile properties of cables according to claim 8, characterized in that: The drive unit includes a threaded rod (41) rotatably mounted on the mounting carrier (10) and a slide (42) threadedly engaged with the threaded rod (41); the slide (42) is fixedly mounted on a fixed block (32) that is slidably engaged with the mounting carrier (10); the threaded rod (41) is driven by a motor (43) for driving its rotation.

10. A method for testing the tensile properties of cables, applicable to the apparatus for testing the tensile properties of cables as described in claims 1-9, characterized in that, The method includes the following steps: Step 1: Place both ends of the long cable into the two clamps (20) respectively, and clamp the two ends of the long cable with the clamps (20); Step 2: The drive unit drives two sets of traction wheel sets (30) to move relative to each other along the height direction of the mounting carrier (10), and the traction wheel sets (30) drive the middle section of the cable to be lifted and tensioned; Step 3: The drive unit drives the traction wheel group (30) to continue moving to apply tension to the cable until the tension reaches the predetermined value, thus completing the cable tensile performance test. Step 4: Remove the tested cable from the clamp (20).

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