Tension sample strength detection equipment for cable conductor

Abstract

The invention relates to the technical field of cable conductor tension detection, and provides a tension sample strength detection device for a cable conductor, the tension sample strength detection device comprises a detection machine base, the top of the detection machine base is provided with a clamping mechanism, and the clamping mechanism comprises a lower clamp support frame fixedly installed on the top of the detection machine base. By rotating a rotary knob, a worm can rotate to drive a threaded rod to rotate, a movable block moves downwards, a first clamping rod is driven to slide along a first guide groove, an L-shaped transmission plate rotates along a lower clamp supporting frame, and positioning blocks are pulled to slide along the lower clamp supporting frame, so that the two positioning blocks clamp a cable conductor; the first air bag and the second air bag are inflated and extrude the flexible metal wire mesh, and the flexible metal wire mesh is attached to the surface of the cable along with the inflation of the first air bag and the second air bag, so that the clamping force is more uniformly distributed on the whole contact surface, and stress concentration caused by local depression is avoided.

Description

Technical Field

[0001] This invention relates to the field of cable conductor tensile testing technology, and in particular to a tensile test specimen strength testing device for cable conductors. Background Technology

[0002] High-temperature superconducting materials, as novel materials used in cable conductors, possess zero resistance and perfect diamagnetism. As core load-bearing components in power and signal transmission systems, the tensile strength, elongation at break, and other mechanical properties of high-temperature superconducting cable conductors directly determine the cable's laying reliability, long-term service stability, and resistance to external mechanical damage. In fields such as power grid construction, rail transit signal transmission, industrial automation control, and communication base station wiring, cable conductors must withstand tensile tension during laying, static stress under long-term operating conditions, and dynamic loads such as external vibration and impact. Therefore, accurate tensile strength testing is a crucial step in cable product factory inspection, type testing, and quality traceability. To address this issue, patent CN112461667B discloses a device for rapid cable stretching, comprising a base. Two sets of sliding rods are symmetrically fixedly connected to the top of the base, with two rods in each set. A top plate is fixedly connected between the top ends of the two sets of sliding rods. A lifting plate is slidably sleeved between the outer surfaces of the two sets of sliding rods. Two three-section hydraulic cylinders are symmetrically fixedly connected to the bottom of the base, and the output ends of both cylinders are fixedly connected to the top of the lifting plate. A tension sensor is fixedly connected to the top of the base. This invention solves the problem that existing cable pulling devices, when performing tensile testing on cables, involve cumbersome and laborious clamping operations for the cable sample, thus reducing the efficiency of cable tensile testing and greatly increasing the labor intensity of workers. The existing technical solutions mentioned above have the following drawbacks: When in use, the cable conductor is often clamped and positioned by clamping plates or clamping blocks. However, since the core functional layer of the high-temperature superconducting cable conductor is a multi-layer composite structure, clamping the cable with a single clamping plate can easily lead to stress concentration. It is impossible to stably clamp cable conductors of different sizes, resulting in interlayer delamination during the clamping process, causing the sample to fail due to delamination before reaching the true tensile strength. Summary of the Invention

[0003] The purpose of this invention is to provide a tensile strength testing device for cable conductors, which solves the problem that existing tensile strength testing devices for cable conductors cannot stably clamp cable conductors of different sizes.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a tensile strength testing device for cable conductors, including a testing machine base; A clamping mechanism is installed on the top of the testing machine base, and the clamping mechanism includes a lower clamping support frame that is fixedly installed on the top of the testing machine base; The inner wall of the lower clamp support frame is movably connected to a worm gear, one end of which is fixedly connected to a knob. The outer wall of the worm gear is movably connected to a worm wheel, the top of which is fixedly connected to a threaded rod. The outer wall of the threaded rod is movably connected to a movable block, which has a threaded groove inside. The outer wall of the movable block is fixedly connected to a first locking rod, the outer wall of which is movably connected to an L-shaped transmission plate. The inner wall of the L-shaped transmission plate is movably connected to a rotating shaft, and the inner wall of the L-shaped transmission plate is movably connected to a second locking rod. The outer wall of the second locking rod is fixedly connected to a positioning block, and the bottom of the positioning block is fixedly connected to a T-shaped slider. The inner wall of the lower clamp support frame has a T-shaped sliding groove.

[0005] Preferably, the knob is connected to the lower clamp support frame via a worm gear to form a rotating structure. The worm gear is meshed with a worm wheel, and the worm wheel is connected to the lower clamp support frame via a threaded rod to form a rotating structure. The threaded rod is threadedly connected to the movable block via a threaded groove.

[0006] Preferably, the L-shaped transmission plate has a first guide groove inside, and the L-shaped transmission plate forms a sliding structure with the first locking rod through the first guide groove. The L-shaped transmission plate also has a second guide groove inside, and the L-shaped transmission plate forms a sliding structure with the second locking rod through the second guide groove.

[0007] Preferably, the L-shaped transmission plate forms a rotating structure with the lower clamp support frame via a rotating shaft, and the T-shaped slider forms a sliding structure with the lower clamp support frame via a T-shaped groove.

[0008] Preferably, a side plate is fixedly connected to the top of the positioning block, a limit post is movably connected inside the side plate, a baffle is fixedly connected to the outer wall of the limit post, and a return spring is installed on one side of the baffle.

[0009] Preferably, the limiting post and the side plate form a sliding structure, and the reset spring is sleeved and installed on the outer wall of the limiting post.

[0010] Preferably, an L-shaped receiving rod is fixedly connected to the outer wall of the movable block, a piston is fixedly connected to one end of the L-shaped receiving rod, an air cylinder is movably connected to the outer wall of the piston, an air supply hose is fixedly connected to the outer wall of the air cylinder, the output end of the air supply hose is connected to the positioning block, a first air bladder is fixedly connected to the inner wall of the positioning block, a second air bladder is fixedly connected to the inner wall of the positioning block, and a flexible metal wire mesh is fixedly connected to the inside of the positioning block.

[0011] Preferably, the piston and the air cylinder form a sliding structure, and the L-shaped receiving rod is symmetrically arranged about the central axis of the movable block.

[0012] Preferably, a tensioning mechanism is fixedly connected to the top of the testing machine base. The tensioning mechanism includes a guide bracket fixedly installed on the top of the testing machine base. A guide groove is opened inside the guide bracket. A drive motor is fixedly connected to the top of the guide bracket. The output shaft of the drive motor is fixedly connected to a first lead screw through a coupling. A first threaded block is movably connected to the outer wall of the first lead screw. A timing belt assembly is installed on the outer wall of the first lead screw. A second lead screw is installed on the inner wall of the timing belt assembly. A second threaded block is movably connected to the outer wall of the second lead screw. A tensioning frame is fixedly connected to the outer wall of the second threaded block. An upper clamp is installed at the bottom of the tensioning frame.

[0013] Preferably, the first lead screw is threadedly connected to the first threaded block, the second lead screw is threadedly connected to the second threaded block, the first lead screw and the guide bracket form a rotating structure, and the tensioning frame forms a sliding structure with the guide bracket through the guide groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This tensile strength testing device for cable conductors, by rotating the knob, can cause the worm gear to rotate, driving the threaded rod to rotate, causing the movable block to move down, and driving the two positioning blocks to clamp the cable conductor. At the same time, the first and second air bladders will inflate and compress the flexible metal mesh. The flexible metal mesh will adhere to the cable surface as the first and second air bladders inflate, so that the clamping force is more evenly distributed across the entire contact surface, avoiding stress concentration caused by local depressions, and improving the stability and protection of the clamping. The specific method is as follows: By setting up a clamping mechanism, rotating the knob can rotate the worm gear and drive the threaded rod to rotate, causing the movable block to move down and drive the first clamping rod to slide along the first guide groove. This causes the L-shaped transmission plate to rotate along the lower clamping support frame and pull the positioning block to slide along the lower clamping support frame, so that the two positioning blocks clamp the cable conductor. This facilitates the stable clamping and positioning of cable conductors of different sizes, thereby preventing the cable conductor from falling off during tensile testing. Furthermore, the meshing action of the worm and the worm wheel allows the worm wheel to self-lock after rotation, thereby automatically locking the two positioning blocks after clamping the cable conductor, improving the stability of clamping. Furthermore, as the movable block moves downward, it causes the piston, which is fixedly connected to one end of the L-shaped receiving rod, to slide along the air cylinder, compressing the gas inside the air cylinder. This inflates the first and second air bladders and squeezes the flexible metal mesh. The flexible metal mesh then adheres to the cable surface as the first and second air bladders inflate, forming a "flexible support skeleton." This allows the clamping force to be distributed more evenly across the entire contact surface, avoiding stress concentration caused by localized depressions. Furthermore, as the positioning block moves, the limiting post is driven to contact the outer wall of the cable conductor first. Under the action of the return spring, the limiting post can pre-compress and position the cable conductor. The pre-tightening force provided by the return spring can give the cable a basic frictional force in the initial stage of air-clamping, preventing the cable from axially moving during the air-pressurization process and avoiding repeated friction damage to the cable surface. Moreover, the elastic characteristics of the return spring can keep the pre-tightening force flexible, avoiding indentations or micro-cracks caused by rigid positioning to the cable, and providing transitional protection for the uniform clamping of the airbag in the future. By incorporating a tensioning mechanism, the first lead screw can be rotated by starting the drive motor. Under the transmission of the synchronous belt assembly, the second lead screw can be rotated synchronously, causing the first and second threaded blocks to move upwards synchronously. This allows the tensioning frame to slide upwards along the guide groove, facilitating stable tension testing of the cable conductor. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a bottom-view structural diagram of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the guide bracket of the present invention; Figure 5 This is a front view schematic diagram of the clamping mechanism of the present invention; Figure 6 This is a three-dimensional structural diagram of the lower clamp support frame of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the worm gear of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the positioning block of the present invention; Figure 9 This is a three-dimensional cross-sectional view of the air cylinder structure of the present invention; Figure 10 This is a schematic diagram of the three-dimensional structure of the tensioning frame of the present invention.

[0016] The reference numerals in the figure are as follows: 1. Testing machine base; 2. Clamping mechanism; 21. Lower clamp support frame; 22. Worm gear; 23. Knob; 24. Worm wheel; 25. Threaded rod; 26. Moving block; 261. L-shaped receiving rod; 262. Piston; 263. Air cylinder; 264. Air supply hose; 265. First airbag; 266. Second airbag; 267. Flexible metal wire mesh; 27. First clamping rod; 271. L-shaped transmission plate; 272. Rotating shaft; 273. First guide groove; 274. Second guide groove; 275. Second locking rod; 28. Positioning block; 281. Side plate; 282. Limiting post; 283. Baffle; 284. Return spring; 29. ​​T-shaped slider; 3. Threaded groove; 4. T-shaped slide; 5. Tensioning mechanism; 51. Guide bracket; 52. Guide slide; 53. Drive motor; 54. First lead screw; 55. First threaded block; 56. Synchronous belt assembly; 57. Second lead screw; 58. Second threaded block; 59. Tensioning frame; 6. Upper clamp. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-10 The present invention provides a tensile strength testing device for cable conductors, including a testing machine base 1.

[0019] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, a clamping mechanism 2 is installed on the top of the testing machine base 1. The clamping mechanism 2 includes a lower clamping support frame 21 fixedly installed on the top of the testing machine base 1. A worm gear 22 is movably connected to the inner wall of the lower clamping support frame 21. A knob 23 is fixedly connected to one end of the worm gear 22. A worm wheel 24 is movably connected to the outer wall of the worm gear 22. A threaded rod 25 is fixedly connected to the top of the worm wheel 24. A movable block 26 is movably connected to the outer wall of the threaded rod 25. A threaded groove 3 is opened inside the movable block 26. A first locking rod 27 is fixedly connected to the outer wall of the movable block 26. An L-shaped transmission plate 271 is movably connected to the outer wall of the first locking rod 27. A rotating shaft 272 is movably connected to the inner wall of the L-shaped transmission plate 271. The rotating shaft 272 is fixedly installed on the outer wall of the lower clamping support frame 21. A second locking rod 275 is movably connected to the inside of the L-shaped transmission plate 271. A positioning block 28 is fixedly connected to the outer wall of the second locking rod 275. The bottom of the 8 is fixedly connected to a T-shaped slider 29. The lower clamp support frame 21 has a T-shaped groove 4 inside. The knob 23 forms a rotating structure with the lower clamp support frame 21 through the worm 22. The worm 22 is meshed with the worm wheel 24. The worm wheel 24 forms a rotating structure with the lower clamp support frame 21 through the threaded rod 25. The threaded rod 25 is threadedly connected to the movable block 26 through the threaded groove 3. The L-shaped transmission plate 271 has a first guide groove 273 inside. The L-shaped transmission plate 271 forms a sliding structure with the first locking rod 27 through the first guide groove 273. The L-shaped transmission plate 271 has a second guide groove 274 inside. The L-shaped transmission plate 271 forms a sliding structure with the second locking rod 275 through the second guide groove 274. The L-shaped transmission plate 271 forms a rotating structure with the lower clamp support frame 21 through the rotating shaft 272. The T-shaped slider 29 forms a sliding structure with the lower clamp support frame 21 through the T-shaped groove 4.

[0020] By placing one end of the high-temperature superconducting cable conductor on the lower clamp support frame 21 and rotating the knob 23, the worm gear 22 can be rotated. Since the worm gear 22 is meshed with the worm wheel 24, the worm wheel 24 can rotate and drive the threaded rod 25 to rotate. Since the threaded rod 25 is threadedly connected to the movable block 26 through the threaded groove 3, the movable block 26 can be moved down, causing the first clamping rod 27 to slide along the first guide groove 273 opened inside the L-shaped transmission plate 271. Under the action of the rotating shaft 272, the L-shaped transmission plate 271 can be rotated along the lower clamp support frame 21. Since the L-shaped transmission plate 271 forms a sliding structure with the second clamping rod 275 through the second guide groove 274, the rotating traction positioning block 28 of the L-shaped transmission plate 271 slides along the lower clamp support frame 21. At this time, the T-shaped slider 29 slides along the T-shaped groove 4 opened inside the lower clamp support frame 21, so that the two positioning blocks 28 clamp and position the cable conductor.

[0021] Reference Figure 5 , Figure 6 , Figure 7 , Figure 8and Figure 9 As shown, a side plate 281 is fixedly connected to the top of the positioning block 28. A limit post 282 is movably connected inside the side plate 281. A baffle 283 is fixedly connected to the outer wall of the limit post 282. A return spring 284 is installed on one side of the baffle 283. The limit post 282 and the side plate 281 form a sliding structure. The return spring 284 is sleeved and installed on the outer wall of the limit post 282. An L-shaped receiving rod 261 is fixedly connected to the outer wall of the movable block 26. A piston 262 is fixedly connected to one end of the L-shaped receiving rod 261. An air cylinder 263 is movably connected to the outer wall of the piston 262. The air cylinder 263 is fixedly installed on the inner wall of the lower clamp support frame 21. A... The air supply hose 264 has its output end connected to the positioning block 28. The inner wall of the positioning block 28 is fixedly connected to a first airbag 265 and a second airbag 266. The first airbag 265 and the second airbag 266 are pre-filled with gas to ensure clamping fit when the cable size is large. The inside of the positioning block 28 is fixedly connected to a flexible metal wire mesh 267. The piston 262 and the air cylinder 263 form a sliding structure. The L-shaped receiving rod 261 is symmetrically arranged around the central axis of the movable block 26. The inside of the positioning block 28 is provided with an air supply groove, and the output end of the air supply groove is connected to the first airbag 265 and the second airbag 266 respectively.

[0022] As the positioning block 28 moves, the limiting post 282 first contacts the outer wall of the cable conductor. With the continuous movement of the positioning block 28, the limiting post 282 slides along the side plate 281, and the baffle 283 squeezes the return spring 284. Under the action of the return spring 284, the limiting post 282 can pre-compress and position the cable conductor. As the movable block 26 moves down, the piston 262, which is fixedly connected to one end of the L-shaped receiving rod 261, slides along the air cylinder 263, so that the gas in the air cylinder 263 is compressed and delivered to the positioning block 28 through the air delivery hose 264. Then, the air delivery groove in the positioning block 28 inputs into the first airbag 265 and the second airbag 266, so that the first airbag 265 and the second airbag 266 are inflated and squeeze the flexible metal wire mesh 267, thereby making the flexible metal wire mesh 267 adhere to the outer wall of the cable conductor and improve the stability of clamping.

[0023] Reference Figure 1 , Figure 4 and Figure 10As shown, a tensioning mechanism 5 is fixedly connected to the top of the testing machine base 1. The tensioning mechanism 5 includes a guide bracket 51 fixedly installed on the top of the testing machine base 1. A guide groove 52 is opened inside the guide bracket 51. A drive motor 53 is fixedly connected to the top of the guide bracket 51. The output shaft of the drive motor 53 is fixedly connected to a first lead screw 54 through a coupling. A first threaded block 55 is movably connected to the outer wall of the first lead screw 54. A timing belt assembly 56 is installed on the outer wall of the first lead screw 54. A second lead screw 57 is installed on the inner wall of the timing belt assembly 56. A second threaded block 58 is movably connected to the outer wall of the second lead screw 57. A tension frame 59 is fixedly connected to the outer wall of the second threaded block 58. A tension sensor is installed inside the tension frame 59. An upper clamp 6 is installed at the bottom of the tension frame 59. The first lead screw 54 is threadedly connected to the first threaded block 55, and the second lead screw 57 is threadedly connected to the second threaded block 58. The first lead screw 54 and the guide bracket 51 form a rotating structure, and the tension frame 59 and the guide bracket 51 form a sliding structure through the guide groove 52.

[0024] By clamping and positioning the bottom end of the cable conductor, and then clamping and positioning the top end of the cable conductor sample by the upper clamp 6, the drive motor 53 is started, which can rotate the first lead screw 54. Under the transmission of the synchronous belt assembly 56, the second lead screw 57 can rotate synchronously. Since the first lead screw 54 is threadedly connected to the first threaded block 55, and the second lead screw 57 is threadedly connected to the second threaded block 58, the first threaded block 55 and the second threaded block 58 can move upward synchronously, so that the tension frame 59 slides upward along the guide groove 52, so that the cable conductor is stretched. Then, the tension sensor in the tension frame 59 is used to detect the tension of the cable conductor.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tensile strength testing device for cable conductors, comprising a testing machine base (1); Its features are: The top of the testing machine base (1) is equipped with a clamping mechanism (2), which includes a lower clamping support frame (21) fixedly installed on the top of the testing machine base (1). The inner wall of the lower clamp support frame (21) is movably connected to a worm gear (22), one end of which is fixedly connected to a knob (23). The outer wall of the worm gear (22) is movably connected to a worm wheel (24), the top of which is fixedly connected to a threaded rod (25). The outer wall of the threaded rod (25) is movably connected to a movable block (26), the interior of which has a threaded groove (3). The outer wall of the movable block (26) is fixedly connected to a first locking rod (27). The outer wall of the first clamping rod (27) is movably connected to an L-shaped transmission plate (271), the inner wall of the L-shaped transmission plate (271) is movably connected to a rotating shaft (272), the interior of the L-shaped transmission plate (271) is movably connected to a second clamping rod (275), the outer wall of the second clamping rod (275) is fixedly connected to a positioning block (28), the bottom of the positioning block (28) is fixedly connected to a T-shaped slider (29), and the interior of the lower clamping support frame (21) is provided with a T-shaped groove (4).

2. The tensile strength testing device for cable conductors according to claim 1, characterized in that: The knob (23) forms a rotating structure with the lower clamp support frame (21) via the worm (22). The worm (22) is meshed with the worm wheel (24). The worm wheel (24) forms a rotating structure with the lower clamp support frame (21) via the threaded rod (25). The threaded rod (25) is threadedly connected to the movable block (26) via the threaded groove (3).

3. The tensile strength testing device for cable conductors according to claim 1, characterized in that: The L-shaped transmission plate (271) has a first guide groove (273) inside. The L-shaped transmission plate (271) and the first locking rod (27) form a sliding structure through the first guide groove (273). The L-shaped transmission plate (271) has a second guide groove (274) inside. The L-shaped transmission plate (271) and the second locking rod (275) form a sliding structure through the second guide groove (274).

4. The tensile strength testing device for cable conductors according to claim 1, characterized in that: The L-shaped transmission plate (271) forms a rotating structure with the lower clamp support frame (21) through the rotating shaft (272), and the T-shaped slider (29) forms a sliding structure with the lower clamp support frame (21) through the T-shaped slide groove (4).

5. The tensile strength testing device for cable conductors according to claim 1, characterized in that: The top of the positioning block (28) is fixedly connected to a side plate (281), and the inside of the side plate (281) is movably connected to a limit post (282). The outer wall of the limit post (282) is fixedly connected to a baffle (283), and a return spring (284) is installed on one side of the baffle (283).

6. The tensile strength testing device for cable conductors according to claim 5, characterized in that: The limiting post (282) and the side plate (281) form a sliding structure, and the reset spring (284) is sleeved and installed on the outer wall of the limiting post (282).

7. The tensile strength testing device for cable conductors according to claim 1, characterized in that: An L-shaped support rod (261) is fixedly connected to the outer wall of the movable block (26). A piston (262) is fixedly connected to one end of the L-shaped support rod (261). An air cylinder (263) is movably connected to the outer wall of the piston (262). An air delivery hose (264) is fixedly connected to the outer wall of the air cylinder (263). The output end of the air delivery hose (264) is connected to the positioning block (28). A first airbag (265) is fixedly connected to the inner wall of the positioning block (28). A second airbag (266) is fixedly connected to the inner wall of the positioning block (28). A flexible metal wire mesh (267) is fixedly connected inside the positioning block (28).

8. The tensile strength testing device for cable conductors according to claim 7, characterized in that: The piston (262) and the air cylinder (263) form a sliding structure, and the L-shaped receiving rod (261) is symmetrically arranged with respect to the central axis of the movable block (26).

9. The tensile strength testing device for cable conductors according to claim 1, characterized in that: A tensioning mechanism (5) is fixedly connected to the top of the testing machine base (1). The tensioning mechanism (5) includes a guide bracket (51) fixedly installed on the top of the testing machine base (1). A guide groove (52) is provided inside the guide bracket (51). A drive motor (53) is fixedly connected to the top of the guide bracket (51). The output shaft of the drive motor (53) is fixedly connected to a first lead screw (54) through a coupling. A first threaded block (55) is movably connected to the outer wall of the first lead screw (54). A synchronous belt assembly (56) is installed on the outer wall of the first lead screw (54). A second lead screw (57) is installed on the inner wall of the synchronous belt assembly (56). A second threaded block (58) is movably connected to the outer wall of the second lead screw (57). A tensioning frame (59) is fixedly connected to the outer wall of the second threaded block (58). An upper clamp (6) is installed at the bottom of the tensioning frame (59).

10. A tensile strength testing device for cable conductors according to claim 9, characterized in that: The first lead screw (54) is threadedly connected to the first threaded block (55), the second lead screw (57) is threadedly connected to the second threaded block (58), the first lead screw (54) and the guide bracket (51) form a rotating structure, and the tensioning frame (59) and the guide bracket (51) form a sliding structure through the guide groove (52).

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