A tensile strength testing device applicable to cables of various specifications

Abstract

The present invention relates to the field of cable detection technology, and discloses a tensile strength detection device applicable to cables of various specifications, comprising a base frame and a movable crossbeam, a driving support assembly for driving the movable crossbeam to move, a pre-clamping mechanism installed on the base frame and the movable crossbeam for preliminary clamping, a torque adjustment mechanism installed on the pre-clamping mechanism for multi-point clamping and adjusting torque, and a sample clamped inside the pre-clamping mechanism and the torque adjustment mechanism. By providing a fixed extrusion assembly and a free extrusion assembly, the sample is uniformly clamped at multiple points using fixed extrusion parts and movable extrusion parts on an outer frame, wherein the fixed extrusion part can be clamped by rotating a thread in a connecting block, while the movable extrusion part needs to first slide to a suitable position in the outer frame before clamping, thereby dispersing the clamping points, adapting to cables of different diameters and shapes, and ensuring a stable and reliable detection process.

Description

Technical Field

[0001] The present invention relates to the technical field of cable detection, and in particular to a tensile strength detection device applicable to cables of various specifications. Background Art

[0002] With the widespread use of cables in fields such as power and communications, ensuring their tensile strength meets standards is crucial. Traditional testing devices are typically designed for specific cable specifications and are difficult to adapt to diverse needs. Therefore, the industry urgently needs to develop a tensile strength tester that can be used for a variety of cable specifications. This device, with its modular design and intelligent adjustment system, can flexibly adapt to cables of varying diameters and materials, ensuring accurate and efficient testing. This development stems from advances in industrial automation and quality inspection technologies, aiming to improve the standardization and safety of cable production and meet the growing market demand for high-quality cables.

[0003] Patent publication number CN117213979A discloses a device for testing the tensile strength of wires and cables. The device comprises a testing box, wherein a stretching mechanism and two symmetrically arranged torsion assemblies are provided within the testing box. A bidirectional drive assembly is provided on the stretching mechanism, which is in transmission connection with the bidirectional drive assembly, which is in transmission connection with the two torsion assemblies. The stretching mechanism comprises a lifting assembly, which is fixedly connected to the bidirectional drive assembly, which is in transmission connection with a clamping assembly. A fixed assembly is provided on the inner bottom wall of the testing box, and the clamping assembly is arranged correspondingly to the fixed assembly. When in use, the present invention drives the bidirectional drive assembly to rotate via the lifting assembly, thereby simultaneously testing the tensile strength of the wires and cables and testing their torsional strength, without the need to replace equipment and thereby improving testing efficiency.

[0004] The existing technology has the following defects:

[0005] Unable to apply to tensile strength testing of cables of various specifications: There are many types of cable specifications, among which the diameter and shape of the cable are important factors to be considered in testing. The shape classification of the cable mainly includes round cables, flat cables and twisted cables. When the testing device cannot meet diverse needs, it cannot adapt to cables of different diameters or shapes, resulting in slipping or damage to the sample during testing. In addition, the force measurement range of the existing testing device is limited and cannot accurately detect the tensile strength of ultra-thin or ultra-thick cables. These problems directly affect the detection accuracy and efficiency. Therefore, it is necessary to set up a structure that can be applicable to cables of various specifications, which can quickly adapt to cables of different diameters and shapes to ensure that the testing process is stable and reliable, thereby achieving the effect of improving the consistency and repeatability of the test.

[0006] The clamping point cannot be adjusted for twisted cables: twisted cables are composed of multiple wires twisted together to form a whole. This structure makes the twisted cable have better flexibility and higher bending resistance. However, in the tensile strength test, the twisted structure will lead to uneven force distribution, causing local strain in the twisted cable when subjected to force, resulting in uneven force transmission. Therefore, it is necessary to set up a structure with adjustable clamping points to compensate for the uneven force and ensure the accuracy of the test results. This will enable the detection device to efficiently and accurately evaluate the tensile strength of various types of twisted cables, thereby providing reliable guarantees for cable quality control and standardized production. Summary of the Invention

[0007] In view of the problems that the existing technology is not applicable to the tensile strength detection of cables of various specifications and the clamping point cannot be adjusted for twisted cables, a tensile strength detection device applicable to cables of various specifications is proposed.

[0008] The present application provides a tensile strength testing device that can be applied to cables of various specifications. Its purpose is: through the provision of fixed extrusion components and free extrusion components, it can quickly adapt to cables of different diameters and shapes, ensure that the testing process is stable and reliable, and achieve the effect of improving the consistency and repeatability of the test. Through the provision of clamping point adjustment components, the unevenness of the force is compensated to ensure the accuracy of the test results, so that the testing device can efficiently and accurately evaluate the tensile strength of various types of twisted cables, thereby providing reliable guarantees for cable quality control and standardized production.

[0009] The technical solution of the present invention is: a tensile strength testing device applicable to cables of various specifications, comprising a base frame and a movable crossbeam, a driving support assembly for driving the movable crossbeam to move, a pre-clamping mechanism installed on the base frame and the movable crossbeam for preliminary clamping, a torque adjustment mechanism installed on the pre-clamping mechanism for multi-point clamping and torque adjustment, and a sample clamped inside the pre-clamping mechanism and the torque adjustment mechanism, characterized in that: the torque adjustment mechanism comprises two fixed columns and two fixed loading and unloading frames fixedly connected in sequence to the pre-clamping mechanism, the inner walls of the two fixed loading and unloading frames are both slidably connected to a clamping point adjustment assembly for adjusting the torque, and a fixed extrusion assembly for multi-point clamping is provided between the two fixed loading and unloading frames and the two clamping point adjustment assemblies;

[0010] The fixed extrusion assembly includes two outer frames fixedly connected between two fixed loading and unloading frames, two symmetrically arranged connecting blocks are fixedly connected between the two outer frames, the inner walls of the two connecting blocks are threadedly connected with fixed extrusion parts, the outer walls of the two outer frames are fixedly connected with multiple fixed threaded blocks, and the outer walls of the fixed threaded blocks are provided with free extrusion assemblies.

[0011] By adopting the above scheme, after the sample is clamped and fixed by the upper and lower pre-clamping mechanisms through the set fixed extrusion assembly, the fixed extrusion piece and the free extrusion assembly on the outer frame are used to evenly clamp the sample at multiple points. The fixed extrusion piece can be clamped by rotating the thread in the connecting block, and the free extrusion assembly can be adjusted on the fixed thread block, thereby dispersing the clamping points and adapting to cables of different diameters and shapes, ensuring a stable and reliable detection process.

[0012] Furthermore, the free extrusion assembly includes a movable extrusion part slidingly connected between two outer frames, the outer wall of the movable extrusion part is threadedly connected to a free movable seat, the inner wall of the free movable seat is provided with a fixed thread groove and an adjusting thread groove, the fixed thread groove is threadedly connected to the fixed thread block, and the adjusting thread groove is threadedly connected to the movable extrusion part.

[0013] By adopting the above scheme, after being clamped by the fixed extrusion part, the movable extrusion part needs to first slide to the appropriate position in the outer frame, and the free movable seat outside the movable extrusion part is screwed into the outside of the fixed thread block through the fixed thread groove for fixation, and then the movable extrusion part is threadedly rotated in the adjusting thread groove inside the free movable seat for clamping, thereby adjusting the clamping point.

[0014] Furthermore, the clamping point adjustment assembly includes a slide groove and an adjustment groove opened on the inner wall of the fixed column, the slide groove is connected to the adjustment groove, the inner wall of the slide groove is slidably connected to a sliding loading and unloading rack, the end of the sliding loading and unloading rack close to the sample is fixedly connected to the outer frame, and the end of the sliding loading and unloading rack away from the sample is rotatably connected to a rotating rod, and the outer wall of the rotating rod is clamped with the inner wall of the adjustment groove.

[0015] By adopting the above scheme, through the provided clamping point adjustment assembly, if the sample is a twisted cable, corresponding multi-point clamping can be performed according to the number of twisted cables, and the distance between the sliding loading and unloading frame and the fixed loading and unloading frame can be adjusted by manually adjusting the position of the rotating rod in the adjustment slot. Then, the corresponding position of each wire or each group of wires of the twisted cable is clamped by the fixed extrusion member and the movable extrusion member connected to the sliding loading and unloading frame, so that the clamping force of each wire or each group of wires of the twisted cable is equal.

[0016] Furthermore, the pre-clamping mechanism includes two fixed seats respectively fixedly connected to the outer walls of the two fixed columns, two symmetrically arranged eccentric shafts are rotatably connected between the two fixed seats, the outer walls of the two eccentric shafts are rotatably connected to clamping wheels, and a counter-rotating component is arranged inside one of the fixed seats.

[0017] Furthermore, the counter-rotating assembly includes a rotating shaft rotatably connected to the inside of the fixed seat, the outer wall of the rotating shaft is provided with two counter-rotating gears facing opposite directions, and the two eccentric shafts are provided with driven bevel gears at one end close to the rotating shaft, and the two driven bevel gears are respectively engaged with the two counter-rotating gears facing opposite directions.

[0018] Furthermore, one end of the rotating shaft is fixedly connected to a knob, a scale is provided on the surface of the knob, and a locking assembly is provided at one end of the rotating shaft away from the knob.

[0019] By adopting the above scheme, by manually rotating the knob, the rotating shaft drives the two opposite rotating gears to rotate, and the two driven bevel gears engaged with the two opposite rotating gears rotate in the opposite direction. As a result, the two clamping wheels are driven by the eccentric shaft to rotate to clamp the sample. By setting the eccentric shaft not to be coaxial with the clamping wheel, the distance between the two clamping wheels changes in a curve and is displayed on the scale, which plays a role of preliminary clamping and fixing.

[0020] Furthermore, the locking assembly includes a limit frame fixedly connected to the outer wall of the movable beam, the inner wall of the limit frame is slidably connected to a slider, the inner wall of the slider is provided with an internal thread groove, the end of the rotating shaft away from the knob is fixedly connected to a locking thread rod, and the locking thread rod is threadedly connected to the internal thread groove.

[0021] By adopting the above scheme, through the setting of the locking assembly, when the rotating shaft rotates, the locking threaded rod connected to the end of the rotating shaft rotates in the internal thread groove, so that the slider slides and is limited in the limit frame, and the clamping wheel is locked to prevent the sample from escaping, providing conditions for subsequent torque adjustment, and avoiding inaccurate detection caused by sliding or deviation of the sample.

[0022] Furthermore, the drive support assembly includes a motor cabinet fixedly installed at the bottom of the base frame, and a support frame fixedly installed at the top of the base frame. The inner wall of the support frame is rotatably connected to two synchronous threaded rods, and the two synchronous threaded rods rotate synchronously through the power output of the motor cabinet.

[0023] Furthermore, outer walls of the two synchronous threaded rods are threadedly connected with threaded sleeves, and the ends of the two threaded sleeves close to the specimen are fixedly connected to the two ends of the movable beam respectively.

[0024] By adopting the above scheme, through the setting of the driving support assembly, after the multi-point clamping at the upper and lower ends of the sample and the multi-point clamping after torque adjustment are completed, the clamping force of the clamping wheel is relaxed, and the power is provided by the motor cabinet to make the two synchronous threaded rods rotate synchronously. The two threaded sleeves and the movable crossbeam between them then slowly move upward to perform tensile testing on the sample, which plays the role of passing the detection power.

[0025] Beneficial effects of the present invention:

[0026] By setting up a fixed extrusion assembly and a free extrusion assembly, the fixed extrusion parts and movable extrusion parts on the outer frame are used to evenly clamp the sample at multiple points. The fixed extrusion part can be clamped by rotating the thread in the connecting block, and the movable extrusion part needs to be slid to a suitable position in the outer frame first, and the free movable seat outside the movable extrusion part is screwed into the outside of the fixed thread block through the fixed thread groove for fixation, and then the movable extrusion part is threadedly rotated in the adjusting thread groove in the free movable seat for clamping. In this way, the clamping points can be dispersed to adapt to cables of different diameters and shapes, ensuring a stable and reliable detection process.

[0027] Through the provided clamping point adjustment component, if the sample is a twisted cable, corresponding multi-point clamping can be performed according to the number of twisted cables, and the distance between the sliding loading and unloading frame and the fixed loading and unloading frame can be adjusted by manually adjusting the position of the rotating rod in the adjustment slot. Then, the corresponding position of each wire or each group of wires of the twisted cable is clamped by the fixed extrusion piece and the movable extrusion piece connected to the sliding loading and unloading frame, so that the clamping force of each wire or each group of wires of the twisted cable is equal, thereby achieving the effect of providing reliable protection for cable quality control and standardized production.

[0028] Through the pre-clamping mechanism, the knob is manually rotated to make the rotating shaft drive the two opposite rotating gears to rotate, and the two driven bevel gears meshing with the two opposite rotating gears rotate in the opposite direction. As a result, the two clamping wheels are driven by the eccentric shaft to rotate to clamp the sample, and by setting the eccentric shaft not to be coaxial with the clamping wheel, the distance between the two clamping wheels changes in a curve. At the same time, the locking assembly connected to the end of the rotating shaft locks the clamping wheel to prevent the sample from escaping, providing conditions for subsequent torque adjustment, and avoiding inaccurate detection caused by sliding or offset of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0030] Figure 2 It is a front view of the main structure of the present invention;

[0031] Figure 3 It is a partial structural schematic diagram of the pre-clamping mechanism of the present invention;

[0032] Figure 4 It is a partial structural schematic diagram of the counter-rotating assembly of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of the rotating shaft of the present invention;

[0034] Figure 6 It is a schematic cross-sectional view of the structure of the locking assembly of the present invention;

[0035] Figure 7 Schematic diagram of the clamping wheel of the present invention at different positions;

[0036] Figure 8 It is a partial structural diagram of the torque adjustment mechanism of the present invention;

[0037] Figure 9 It is a partial structural schematic diagram of the fixed extrusion assembly of the present invention;

[0038] Figure 10 This is a schematic diagram of the explosion of the free extrusion component structure of the present invention;

[0039] Figure 11 This is a schematic diagram of the clamping point adjustment assembly of the present invention in an adjustment state;

[0040] Figure 12 This is a schematic diagram of a clamping state when the sample of the present invention is a round cable;

[0041] Figure 13 This is a schematic diagram of the clamping state when the sample of the present invention is a flat cable.

[0042] In the picture:

[0043] 1. Base frame; 2. Drive support assembly; 21. Motor cabinet; 22. Support frame; 23. Synchronous threaded rod; 24. Threaded sleeve; 3. Movable crossbeam; 4. Pre-clamping mechanism; 41. Fixed seat; 42. Eccentric shaft; 43. Clamping wheel; 44. Counter-rotating assembly; 441. Knob; 442. Scale; 443. Driven helical gear; 444. Counter-rotating gear; 445. Rotating shaft; 45. Locking assembly; 451. Limiting frame; 452. Slider; 453. Internal thread groove; 454. Locking screw Threaded rod; 5. Torque adjustment mechanism; 51. Fixed column; 52. Fixed loading and unloading frame; 53. Fixed extrusion assembly; 531. Outer frame; 532. Connecting block; 533. Fixed extrusion piece; 534. Fixed threaded block; 54. Free extrusion assembly; 541. Free movable seat; 542. Fixed thread groove; 543. Adjusting thread groove; 544. Movable extrusion piece; 55. Clamping point adjustment assembly; 551. Sliding loading and unloading frame; 552. Slide groove; 553. Adjusting groove; 554. Rotating rod; 6. Specimen. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] Reference Figure 1 - Figure 13, provides a tensile strength testing device suitable for cables of various specifications, including a base frame 1 and a movable crossbeam 3, a driving support assembly 2 for driving the movable crossbeam 3 to move, a pre-clamping mechanism 4 installed on the base frame 1 and the movable crossbeam 3 for preliminary clamping, a torque adjustment mechanism 5 installed on the pre-clamping mechanism 4 for multi-point clamping and adjusting torque, and a sample 6 clamped inside the pre-clamping mechanism 4 and the torque adjustment mechanism 5, the torque adjustment mechanism 5 includes two fixed columns 51 and two fixed loading and unloading frames 52 fixedly connected to the pre-clamping mechanism 4 in sequence, the inner walls of the two fixed loading and unloading frames 52 are slidably connected with a clamping point adjustment assembly 55 for adjusting the torque, and a fixed extrusion assembly 53 for multi-point clamping is provided between the two fixed loading and unloading frames 52 and the two clamping point adjustment assemblies 55.

[0046] Reference Figure 8 - Figure 10 The fixed extrusion assembly 53 includes two outer frames 531 fixedly connected between the two fixed loading and unloading frames 52, two symmetrically arranged connecting blocks 532 are fixedly connected between the two outer frames 531, the inner walls of the two connecting blocks 532 are threadedly connected with fixed extrusion parts 533, the outer walls of the two outer frames 531 are fixedly connected with multiple fixed threaded blocks 534, and the outer walls of the fixed threaded blocks 534 are provided with free extrusion assemblies 54.

[0047] Specifically, the shape of the sample 6 is various, such as round cables, flat cables and twisted cables, among which the round cables and flat cables are more uniform in force transmission and distribution, so uniform multi-point clamping is sufficient. For twisted cables, due to the structure of multiple conductors, local strain will occur in the twisted cables when subjected to force. Therefore, on the basis of uniform multi-point clamping, it is also necessary to maintain consistent torque to compensate for the clamping force; the two fixed extrusion members 533 symmetrically arranged on the outer frame 531 can be used for clamping fixed points, and the multiple fixed threaded blocks 534 arranged on the outer frame 531 can be used for the free extrusion component 54 to clamp fixed points; one end of the fixed extrusion member 533 is a rubber pad and the other end is a hand wheel, which can be manually adjusted. A pressure sensor is provided on the rubber pad to monitor the applied pressure in real time.

[0048] Through the set fixed extrusion component 53, after the sample 6 is clamped and fixed by the upper and lower pre-clamping mechanisms 4, the fixed extrusion piece 533 and the free extrusion component 54 on the outer frame 531 are used to evenly clamp the sample 6 at multiple points. The fixed extrusion piece 533 can be clamped by rotating the thread in the connecting block 532, and the free extrusion component 54 can be adjusted on the fixed thread block 534, thereby dispersing the clamping points and adapting to cables of different diameters and shapes, ensuring a stable and reliable detection process.

[0049] Reference Figure 10The free extrusion assembly 54 includes a movable extrusion piece 544 that is slidably connected between the two outer frames 531. The outer wall of the movable extrusion piece 544 is threadedly connected to the free movable seat 541. The inner wall of the free movable seat 541 is provided with a fixed thread groove 542 and an adjusting thread groove 543. The fixed thread groove 542 is threadedly connected to the fixed thread block 534, and the adjusting thread groove 543 is threadedly connected to the movable extrusion piece 544.

[0050] After being clamped by the fixed extrusion piece 533, the movable extrusion piece 544 must first slide to a suitable position in the outer frame 531, and the free movable seat 541 outside the movable extrusion piece 544 is screwed into the outside of the fixed thread block 534 through the fixed thread groove 542 for fixation, and then the movable extrusion piece 544 is threadedly rotated in the adjusting thread groove 543 inside the free movable seat 541 for clamping, thereby adjusting the clamping point.

[0051] Reference Figure 11 The clamping point adjustment assembly 55 includes a slide groove 552 and an adjustment groove 553 opened on the inner wall of the fixed column 51. The slide groove 552 is connected to the adjustment groove 553. The inner wall of the slide groove 552 is slidably connected to the sliding loading and unloading rack 551. The end of the sliding loading and unloading rack 551 close to the sample 6 is fixedly connected to the outer frame 531. The end of the sliding loading and unloading rack 551 away from the sample 6 is rotatably connected to the rotating rod 554. The outer wall of the rotating rod 554 is clamped with the inner wall of the adjustment groove 553.

[0052] Specifically, the rotating rod 554 can rotate on the sliding loading and unloading frame 551. The rotated rotating rod 554 can be used as a handle to manually adjust the position of the sliding loading and unloading frame 551. When the sliding loading and unloading frame 551 moves, it drives the fixed extrusion assembly 53 and the free extrusion assembly 54 therebetween to move together.

[0053] By providing the clamping point adjustment assembly 55, if the sample 6 is a twisted cable, corresponding multi-point clamping can be performed according to the number of twisted cables, and the position of the rotating rod 554 in the adjustment slot 553 can be manually adjusted to adjust the distance between the sliding loading and unloading frame 551 and the fixed loading and unloading frame 52. Then, the corresponding positions of each wire or each group of wires of the twisted cable are clamped by the fixed extrusion member 533 and the movable extrusion member 544 connected to the sliding loading and unloading frame 551, so that the clamping force of each wire or each group of wires of the twisted cable is equal.

[0054] Reference Figure 3 The pre-clamping mechanism 4 includes two fixed seats 41 respectively fixedly connected to the outer walls of the two fixed columns 51, and two symmetrically arranged eccentric shafts 42 are rotatably connected between the two fixed seats 41. The outer walls of the two eccentric shafts 42 are rotatably connected to the clamping wheels 43, and a counter-rotating component 44 is arranged inside one of the fixed seats 41.

[0055] Specifically, the eccentric shaft 42 and the clamping wheels 43 are not coaxial, and the distance between the two clamping wheels 43 changes with the rotation of the eccentric shaft 42 .

[0056] Reference Figure 4 - Figure 5 The opposing rotating assembly 44 includes a rotating shaft 445 rotatably connected to the inside of the fixed seat 41, and the outer wall of the rotating shaft 445 is sleeved with two opposing rotating gears 444 facing oppositely. The two eccentric shafts 42 are sleeved with driven bevel gears 443 on one end close to the rotating shaft 445, and the two driven bevel gears 443 are respectively engaged with the two opposing rotating gears 444 facing oppositely. One end of the rotating shaft 445 is fixedly connected to the knob 441, and a scale 442 is provided on the surface of the knob 441. A locking assembly 45 is provided on the end of the rotating shaft 445 away from the knob 441.

[0057] By manually rotating the knob 441, the rotating shaft 445 drives the two opposite rotating gears 444 to rotate, and the two driven bevel gears 443 engaged with the two opposite rotating gears 444 rotate in the opposite direction. As a result, the two clamping wheels 43 are driven by the eccentric shaft 42 to rotate to clamp the sample 6. By setting the eccentric shaft 42 not to be coaxial with the clamping wheels 43, the distance between the two clamping wheels 43 changes in a curve and is displayed on the scale 442, which plays a role in preliminary clamping and fixing.

[0058] Reference Figure 6 The locking assembly 45 includes a limit frame 451 fixedly connected to the outer wall of the movable beam 3, and the inner wall of the limit frame 451 is slidably connected to a slider 452. The inner wall of the slider 452 is provided with an internal thread groove 453. The end of the rotating shaft 445 away from the knob 441 is fixedly connected to a locking threaded rod 454, and the locking threaded rod 454 is threadedly connected to the internal thread groove 453.

[0059] Through the provided locking assembly 45, when the rotating shaft 445 rotates, the locking threaded rod 454 connected to the end of the rotating shaft 445 rotates in the internal thread groove 453, so that the slider 452 slides and is limited in the limit frame 451, and the clamping wheel 43 is locked to prevent the sample 6 from escaping, providing conditions for subsequent torque adjustment, and preventing the sample 6 from sliding or deflecting and causing inaccurate detection.

[0060] Reference Figure 2 The driving support assembly 2 includes a motor cabinet 21 fixedly installed at the bottom of the base frame 1, and a support frame 22 fixedly installed at the top of the base frame 1. The inner wall of the support frame 22 is rotatably connected to two synchronous threaded rods 23. The two synchronous threaded rods 23 rotate synchronously through the power output of the motor cabinet 21. The outer walls of the two synchronous threaded rods 23 are threadedly connected with threaded sleeves 24. The ends of the two threaded sleeves 24 close to the sample 6 are respectively fixedly connected to the two ends of the movable beam 3.

[0061] Through the provided driving support assembly 2, after the multi-point clamping at the upper and lower ends of the sample 6 and the multi-point clamping after torque adjustment are completed, the clamping force of the clamping wheel 43 is relaxed, and the motor cabinet 21 provides power to make the two synchronous threaded rods 23 rotate synchronously, and the two threaded sleeves 24 and the movable crossbeam 3 therebetween slowly move upward to perform tensile testing on the sample 6, playing the role of passing the detection power.

[0062] During use, the sample 6 is passed through the movable crossbeam 3, the pre-clamping mechanism 4 and the torque adjustment mechanism 5, and the manual rotation knob 441 drives the two driven bevel gears 443 to rotate in the opposite direction. The two clamping wheels 43 are driven by the eccentric shaft 42 to rotate to clamp the sample 6. At the same time, the locking assembly 45 connected to the end of the rotating shaft 445 locks the clamping wheel 43 to prevent the sample 6 from breaking free, providing conditions for subsequent torque adjustment, and preventing the sample 6 from sliding or deflecting and causing inaccurate detection. After the sample 6 is clamped and fixed by the upper and lower pre-clamping mechanisms 4, the sample 6 is evenly clamped at multiple points by the fixed extrusion assembly 53 and the free extrusion assembly 54, thereby dispersing the clamping points and adapting to cables of different diameters and shapes to ensure a stable and reliable detection process. If the sample 6 is a twisted cable , corresponding multi-point clamping can be performed according to the number of twisted cables, and the distance between the sliding loading and unloading frame 551 and the fixed loading and unloading frame 52 can be adjusted by manually adjusting the position of the rotating rod 554 in the adjusting groove 553, and then clamping is performed to make the clamping force of each wire or each group of wires of the twisted cable equal. If the number of movable extrusion members 544 is insufficient, it can also be supplemented by the gaps on the fixed loading and unloading frame 52 and the sliding loading and unloading frame 551. After the multi-point clamping and torque adjustment of the upper and lower ends of the sample 6 are completed, the clamping force of the clamping wheel 43 is relaxed, and the power is provided by the motor cabinet 21 to make the two synchronous threaded rods 23 rotate synchronously, and the two threaded sleeves 24 and the movable crossbeam 3 therebetween slowly move upward to perform tensile testing on the sample 6.

[0063] Working principle of the present invention:

[0064] During operation, samples 6 of different shapes, such as round cables, flat cables and twisted cables, are placed through the middle hole of the movable beam 3. The sample 6 passes through the movable beam 3, the pre-clamping mechanism 4 and the torque adjustment mechanism 5. First, the upper and lower pre-clamping mechanisms 4 are operated to clamp the sample 6.

[0065] Manually rotate the knob 441 to cause the rotating shaft 445 to drive the two opposite rotating gears 444 to rotate, and the two driven bevel gears 443 engaged with the two opposite rotating gears 444 rotate in the opposite directions. As a result, the two clamping wheels 43 are driven by the eccentric shaft 42 to rotate to clamp the sample 6. By setting the eccentric shaft 42 not to be coaxial with the clamping wheels 43, the distance between the two clamping wheels 43 changes in a curve and is displayed on the scale 442.

[0066] As the rotating shaft 445 rotates, the locking threaded rod 454 connected to the end of the rotating shaft 445 rotates in the internal thread groove 453, so that the slider 452 slides and is limited in the limit frame 451, locking the clamping wheel 43 to prevent the sample 6 from escaping, providing conditions for subsequent torque adjustment, and preventing the sample 6 from sliding or deflecting and causing inaccurate detection.

[0067] After the sample 6 is clamped and fixed by the upper and lower pre-clamping mechanisms 4, the sample 6 is evenly clamped at multiple points by the fixed extrusion piece 533 and the movable extrusion piece 544 on the outer frame 531. The fixed extrusion piece 533 can be clamped by rotating the thread in the connecting block 532, and the movable extrusion piece 544 needs to first slide to a suitable position in the outer frame 531, and the free movable seat 541 outside the movable extrusion piece 544 is screwed into the outside of the fixed thread block 534 through the fixed thread groove 542 for fixation, and then the movable extrusion piece 544 is threadedly rotated in the adjusting thread groove 543 in the free movable seat 541 for clamping. In this way, the clamping points can be dispersed to adapt to cables of different diameters and shapes, ensuring that the detection process is stable and reliable.

[0068] If sample 6 is a twisted cable, corresponding multi-point clamping can be performed according to the number of twisted cables, and the distance between the sliding loading and unloading frame 551 and the fixed loading and unloading frame 52 can be adjusted by manually adjusting the position of the rotating rod 554 in the adjustment slot 553. Then, the corresponding positions of each wire or group of wires of the twisted cable are clamped by the fixed extrusion member 533 and the movable extrusion member 544 connected to the sliding loading and unloading frame 551, so that the clamping force of each wire or group of wires of the twisted cable is equal. If the number of movable extrusion members 544 is insufficient, it can also be supplemented by the gaps on the fixed loading and unloading frame 52 and the sliding loading and unloading frame 551.

[0069] After the multi-point clamping at the upper and lower ends of the sample 6 and the multi-point clamping after torque adjustment are completed, the clamping force of the clamping wheel 43 is relaxed, and the power is provided by the motor cabinet 21 to make the two synchronous threaded rods 23 rotate synchronously, and the two threaded sleeves 24 and the movable crossbeam 3 therebetween slowly move upward to perform tensile testing on the sample 6.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A tensile strength testing device applicable to cables of various specifications, comprising a base frame and a movable crossbeam, a drive support assembly for driving the movable crossbeam, a pre-clamping mechanism mounted on the base frame and the movable crossbeam for initial clamping, a torque adjustment mechanism mounted on the pre-clamping mechanism for multi-point clamping and torque adjustment, and a specimen clamped within the pre-clamping mechanism and the torque adjustment mechanism, characterized in that: The torque adjustment mechanism includes two fixed columns and two fixed loading and unloading frames that are fixedly connected to the pre-clamping mechanism in sequence, the inner walls of the two fixed loading and unloading frames are slidably connected with a clamping point adjustment component for adjusting the torque, and a fixed extrusion component for multi-point clamping is provided between the two fixed loading and unloading frames and the two clamping point adjustment components; The fixed extrusion assembly includes two outer frames fixedly connected between two fixed loading and unloading frames, two symmetrically arranged connecting blocks are fixedly connected between the two outer frames, the inner walls of the two connecting blocks are threadedly connected with fixed extrusion pieces, the outer walls of the two outer frames are fixedly connected with a plurality of fixed threaded blocks, and the outer walls of the fixed threaded blocks are provided with free extrusion assemblies; The free extrusion assembly includes a movable extrusion member slidably connected between two outer frames, the outer wall of the movable extrusion member is threadedly connected to a free movable seat, the inner wall of the free movable seat is provided with a fixed thread groove and an adjustable thread groove, the fixed thread groove is threadedly connected to the fixed thread block, and the adjustable thread groove is threadedly connected to the movable extrusion member; The clamping point adjustment assembly includes a slide groove and an adjustment groove opened on the inner wall of the fixed column. The slide groove is connected to the adjustment groove. The inner wall of the slide groove is slidably connected to a sliding loading and unloading rack. The end of the sliding loading and unloading rack close to the sample is fixedly connected to the outer frame. The end of the sliding loading and unloading rack away from the sample is rotatably connected to a rotating rod. The outer wall of the rotating rod is clamped with the inner wall of the adjustment groove.

2. The tensile strength testing device applicable to cables of various specifications according to claim 1 is characterized in that: The pre-clamping mechanism includes two fixing seats respectively fixedly connected to the outer walls of the two fixing columns, two symmetrically arranged eccentric shafts are rotatably connected between the two fixing seats, the outer walls of the two eccentric shafts are rotatably connected to clamping wheels, and a counter-rotating component is arranged inside one of the fixing seats.

3. The tensile strength testing device applicable to cables of various specifications according to claim 2 is characterized in that: The counter-rotating assembly includes a rotating shaft rotatably connected to the inside of a fixed seat, the outer wall of the rotating shaft is provided with two counter-rotating gears facing opposite directions, and the ends of the two eccentric shafts close to the rotating shaft are both provided with driven helical gears, and the two driven helical gears are respectively engaged with the two counter-rotating gears facing opposite directions.

4. The tensile strength testing device applicable to cables of various specifications according to claim 3 is characterized in that: One end of the rotating shaft is fixedly connected to a knob, a scale is provided on the surface of the knob, and a locking assembly is provided on the end of the rotating shaft away from the knob.

5. The tensile strength testing device applicable to cables of various specifications according to claim 4 is characterized in that: The locking assembly includes a limit frame fixedly connected to the outer wall of the movable beam, the inner wall of the limit frame is slidably connected to a slider, the inner wall of the slider is provided with an internal thread groove, the end of the rotating shaft away from the knob is fixedly connected to a locking threaded rod, and the locking threaded rod is threadedly connected to the internal thread groove.

6. The tensile strength testing device applicable to cables of various specifications according to claim 1, characterized in that: The driving support assembly includes a motor cabinet fixedly installed at the bottom of the base frame, and a support frame fixedly installed at the top of the base frame. The inner wall of the support frame is rotatably connected to two synchronous threaded rods, and the two synchronous threaded rods rotate synchronously through the power output of the motor cabinet.

7. The tensile strength testing device applicable to cables of various specifications according to claim 6, characterized in that: The outer walls of the two synchronous threaded rods are both threadedly connected with threaded sleeves, and the ends of the two threaded sleeves close to the specimens are fixedly connected to the two ends of the movable beam respectively.

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