Tensile property detection equipment for new material cable production

Abstract

The invention discloses a tensile performance detection device for new material cable production, and relates to a new material cable tensile detection technology, the tensile performance detection device comprises a tension platform matched with a detector body for use, and the tension platform realizes positioning for a new material cable; positioning mechanisms are arranged on the left side and the right side of the upper portion of the tension platform correspondingly, and each positioning mechanism comprises a positioning platform; wherein winding stand columns are fixedly installed on the left side and the right side of the top face of the winding rotary disc, and the winding stand columns wind a new material cable in a transverse 8 shape; and anti-springback mechanisms are slidably mounted on the left side and the right side of the upper portion of the tension platform. According to the tensile property detection equipment for new material cable production, a new material cable is wound in a dual mode through the positioning mechanism, so that the stress area of the cable is prevented from being affected by rigid clamping, meanwhile, an anti-springback arc frame attached to the cable is attached to the outer wall of the cable through a traction rotating wheel installed on an inner wall one-way bearing, the springback amplitude of the cable is reduced, and the service life of the cable is prolonged. And the safety of the tensile property test is improved.

Description

Technical Field

[0001] This invention relates to the field of tensile strength testing technology for new material cables, specifically to a tensile performance testing device for the production of new material cables. Background Technology

[0002] New material cables refer to cables made of novel insulating materials (such as polypropylene and superconducting materials) or conductor materials (such as carbon fiber and aluminum alloys). They have higher performance, are more environmentally friendly, or have special functions (such as high temperature resistance and high conductivity). They typically include graphene cables, carbon fiber cables, and superconducting cables. New material technologies have improved the temperature resistance, conductivity, or environmental friendliness of traditional cables. Tensile testing of these new material cables is a key test for evaluating their mechanical properties. Tensile tests measure indicators such as tensile strength and elongation at break to ensure the reliability of the material under stress.

[0003] The utility model disclosed in CN221445660U is a cable tensile strength testing device. It is equipped with a fastening clamp plate connected to an adjusting screw. When the adjusting knob on the top of the adjusting screw is turned, the fastening clamp plate can be moved downward by means of the threaded engagement between the adjusting screw and the top plate. The cable body is placed on top of the first positioning roller and the second positioning roller. By pressing down with the fastening clamp plate, the cable body can be pressed onto the first positioning roller and the second positioning roller for use. This makes it convenient to fix the cable body in the cable tensile strength testing device.

[0004] The invention disclosed in CN118464633B is a device and method for testing the tensile properties of cables. The device includes a clamping plate fixed to one end of a fixed column to hold the cable body. A rubber sheet is fixed inside the clamping plate, and one side of the rubber sheet abuts against the cable body. This avoids the situation where the cable body is clamped with a smaller clamping surface and a larger outer surface of the cable, and the cable body breaks or deforms prematurely at the contact point before reaching its maximum tensile strength during stretching, resulting in inaccurate tensile property test results.

[0005] However, the tensile performance testing device for the new material cable disclosed above still has the following problems in actual use: the cable end is positioned by a positioning mechanism to achieve tensile testing, but such positioning mechanism uses a squeezing clamping method to fix the cable end, which causes pressure on the cable during positioning, which can easily change the force area of ​​the cable during the tensile process. At the same time, some cables break after the tensile limit, and the reverse force causes the cable to spring back, which can easily lead to safety accidents.

[0006] Therefore, we propose a new tensile performance testing device for cable production to address the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a new type of tensile performance testing equipment for cable production. This invention addresses the problem that existing positioning mechanisms use clamping to fix the cable ends during positioning, which can cause pressure on the cable and easily alter the stress area during the tensile process. Furthermore, some cables may break after reaching their tensile limit, and the resulting reverse force can cause the cable to spring back, potentially leading to safety accidents.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a tensile performance testing device for the production of new material cables, comprising a tensile platform used in conjunction with the testing instrument body, wherein the tensile platform is positioned for the new material cables and is used for tensile testing by the testing instrument after stretching; The tension platform is provided with positioning mechanisms on both the upper left and right sides, and the positioning mechanism includes a positioning platform, and a winding turntable is provided in the middle of the top surface of the positioning platform. Among them, winding columns are fixedly installed on both the left and right sides of the top surface of the winding turntable, and the winding columns wind the new material cable in an "∞" shape. Anti-rebound mechanisms are slidably installed on both the upper left and right sides of the tension platform. The anti-rebound mechanism includes an anti-rebound arc frame, and the anti-rebound arc frame has a traction wheel installed inside through a one-way bearing that rotates at an equal angle.

[0009] Preferably, the positioning mechanism includes a winding turntable that is rotatably mounted on the top center of the positioning platform via a bearing, and the positioning platform is slidably mounted on the left and right sides of the top surface of the tension platform. A bidirectional lead screw is rotatably mounted on the bottom center of the tension platform via a bearing, and the bidirectional lead screw thread passes through the bottom end of the positioning platform.

[0010] Preferably, the positioning mechanism further includes a pressing bracket, which is fixedly installed on the front and rear sides of the winding turntable. The symmetrically distributed pressing brackets are internally slidably connected to the outer end of the pressing arc frame. The pressing arc frame is slidably sleeved on the outside of the left and right winding columns. At the same time, the bottom surface of the pressing arc frame is fixedly installed on both the left and right sides with a sleeved arc plate.

[0011] Preferably, the positioning mechanism further includes a lifting screw, with the upper end of the lifting screw rotatably mounted on the upper end of the pressing bracket, and the lower end of the lifting screw rotatably mounted on the top surface of the winding turntable. The lower ends of the lifting screws on the front and rear sides are connected to each other through a pulley assembly.

[0012] Preferably, the positioning mechanism includes a lifting screw threaded through both the front and rear ends of the middle of the pressing arc frame, and a traction slider is slidably installed inside the pressing bracket. The lower end of the traction slider is connected to the pressing bracket by a return spring. In the initial state, the traction slider is located inside the pressing bracket and slides downward by the pressing arc frame.

[0013] Preferably, the positioning mechanism further includes a positioning flip plate, and the lower end of the positioning flip plate is rotatably mounted on the left and right sides of the top surface of the winding turntable by a torsion spring, and the rotating shaft end of the positioning flip plate is wound and connected to the lower end of the traction steel cable, and the upper end of the traction steel cable is fixedly connected to the lower end of the traction slider.

[0014] Preferably, in the initial state, the positioning flip plate is distributed in an outward flipping inclined structure, and the positioning flip plate is pressed by the pressing arc frame to push the traction slider downward to loosen the traction steel cable. After the positioning flip plate is loosened, it is reset by the torsion spring and rotated inward so as to fit against the outer wall of the coiled column. The descent of the pressing arc frame causes the sleeved arc plate to be positioned at the upper end of the positioning flip plate.

[0015] Preferably, the anti-rebound mechanism further includes a transmission rack, which is slidably mounted on the inner side of the winding turntable, and a transmission tooth block is meshed with the outer side of the transmission rack. The transmission tooth block is fixedly mounted at equal angles on the outer wall of the winding turntable to drive the transmission rack closer to the new material cable.

[0016] Preferably, the outer end of the transmission rack included in the anti-rebound mechanism is fixedly connected to the outer wall of the anti-rebound arc frame, and the anti-rebound arc frame is close to the new material cable, and the traction wheel on the inner wall of the anti-rebound arc frame is attached to the outer walls of the front and rear sides of the new material cable, which is used to protect the new material cable after it breaks instantly, and to prevent the new material cable from breaking and rebounding, causing a safety accident.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This new material cable tensile performance testing equipment uses a positioning mechanism above the tensile platform to wind the new material cable in a dual manner, thereby avoiding rigid clamping from affecting the cable's stress area. Simultaneously, the anti-rebound arc frame, which adheres to the cable, uses a traction wheel mounted on an inner wall one-way bearing to adhere to the cable's outer wall, reducing the cable's rebound amplitude and improving the safety of tensile performance testing. The specific details are as follows: 1. Place the new material cable above the tension platform, and wind the end of the cable around the outer wall of the winding column on the left and right sides above the winding turntable, so that the outer wall of the new material cable is wound in an "∞" shape, thereby avoiding direct clamping and affecting the force-bearing area of ​​the cable.

[0018] Furthermore, the lifting screw inside the pressure bracket rotates, causing the threaded pressure arc frame to slide downward inside the pressure bracket, so that the pressure arc frame is fitted onto the outer wall of the winding column. At the same time, the pressure arc frame contacts the cable on the outer wall of the winding column, preventing it from slipping upward.

[0019] 2. When the pressing arc frame above the pressing bracket moves downward, it contacts and squeezes the traction slider connected by the return spring to slide downward. The traction slider releases the traction cable at the bottom. After the traction cable releases the positioning flip plate connected to the outer end, the positioning flip plate rotates inward through the return of the torsion spring and fits against the outer wall of the cable wound on the outside of the winding column, thereby preventing the cable from scattering.

[0020] The descending pressure arc frame is fitted onto the upper end of the positioning flip plate by the sleeve arc plate at the bottom, thereby preventing the positioning flip plate from flipping outward and affecting the limit of the cable.

[0021] 3. The motor at the bottom of the positioning platform drives the winding turntable and the winding column above to rotate. The winding columns on the left and right sides, together with the positioning flip plate, wind the cable around its outer wall, thereby tensioning the middle of the cable and preventing the cable from being too tight and affecting the subsequent tensile test.

[0022] Furthermore, the rotating winding turntable moves the meshing transmission rack through the transmission gear blocks on the outer wall, and the transmission rack drives the anti-rebound arc frame at the outer end to move synchronously towards the outer wall of the tensioned cable, so that the anti-rebound arc frame contacts the outer wall of the cable through the traction wheel installed by the one-way bearing on the inner wall, thus not affecting the subsequent tensioning operation of the cable.

[0023] 4. The bidirectional lead screw under the tension platform drives the positioning platforms on both sides to slide outwards synchronously. The winding turntable driven by the positioning platform stretches the positioned cable and records the cable's resistance value when it breaks with the testing instrument. The broken cable will rebound rapidly in the opposite direction. The traction wheel connected to the one-way bearing on the outer wall of the cable is used to limit the rebound, thereby reducing the amplitude of the cable rebound and improving the safety of the tensile performance test. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the structure for installing the coiled column according to the present invention; Figure 3 This is a schematic diagram of the anti-rebound frame installation structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5This is a schematic diagram of the installation structure of the winding column and the pressing arc frame of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the initial state of the positioning flip plate of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C; Figure 9 This is a schematic diagram of the structure of the overlay arc frame after it has been lowered according to the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point D.

[0025] In the diagram: 1. Tension platform; 2. Positioning platform; 3. Winding turntable; 4. Winding column; 5. Anti-rebound arc frame; 6. Traction wheel; 7. Two-way lead screw; 8. Pressing bracket; 9. Pressing arc frame; 10. Lifting lead screw; 11. Pulley assembly; 12. Traction slider; 13. Positioning flip plate; 14. Traction cable; 15. Sleeve arc plate; 16. Transmission rack; 17. Transmission gear block; 18. Return spring. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-10 The present invention provides the following technical solution: Example 1: In order to solve the problems existing in the tensile testing of new material cables, this example discloses the following technical solution: a tensile performance testing device for the production of new material cables, wherein positioning mechanisms are provided on both the left and right sides above the tensile platform 1, and the positioning mechanism includes a positioning platform 2, and a winding turntable 3 is provided in the middle of the top surface of the positioning platform 2; wherein, winding columns 4 are fixedly installed on both the left and right sides of the top surface of the winding turntable 3, and the winding columns 4 wind the new material cable in an "∞" shape.

[0028] The positioning mechanism also includes a pressing bracket 8, which is fixedly installed on the front and rear sides of the winding turntable 3. The interior of the symmetrically distributed pressing bracket 8 is slidably connected to the outer end of the pressing arc frame 9. The pressing arc frame 9 is slidably sleeved on the outside of the left and right winding columns 4. At the same time, the bottom surface of the pressing arc frame 9 is fixedly installed on both the left and right sides with a sleeved arc plate 15.

[0029] The positioning mechanism also includes a lifting screw 10, with the upper end of the lifting screw 10 rotatably mounted on the upper end of the pressing bracket 8, and the lower end of the lifting screw 10 rotatably mounted on the top surface of the winding turntable 3. The lower ends of the lifting screws 10 on the front and rear sides are connected to each other through the pulley assembly 11.

[0030] The positioning mechanism includes a lifting screw 10 threaded through the front and rear ends of the middle part of the pressing arc frame 9, and a traction slider 12 is slidably installed inside the pressing bracket 8. The lower end of the traction slider 12 is connected to the pressing bracket 8 by a return spring 18. In the initial state, the traction slider 12 is located inside the pressing bracket 8 and slides downward by the pressing arc frame 9.

[0031] like Figure 2 , Figure 7 As shown, when it is necessary to perform tensile testing on the new material cable, the new material cable is first placed in the middle of the top surface of the tension platform 1, and the end of the new material cable is inserted into the outer wall of the winding column 4 on the left and right sides above the winding turntable 3. The new material cable is then wound in an "∞" shape, thereby forming a multi-turn positioning effect on the outer wall of the winding column 4 to avoid loosening during subsequent tensioning.

[0032] like Figure 5 , Figure 7 As shown, the motor installed on the bottom surface of the winding turntable 3 drives the lifting screw 10 connected to the pulley assembly 11 to rotate. The pressing arc frame 9, which is threadedly connected to the lifting screw 10, is limited by the pressing bracket 8 so that the rotating lifting screw 10 drives the threaded pressing arc frame 9 to slide downward. The pressing arc frame 9 is installed on the outside of the left and right winding columns 4 by the internal slot of the pressing arc frame 9, thereby preventing the new material cable wound on the outer wall of the winding column 4 from slipping off when stretched.

[0033] Example 2: In order to solve the problems existing in the tensile testing of existing new material cables, this example discloses the following technical solution: the positioning mechanism includes a winding turntable 3 which is rotatably mounted on the top center of the positioning platform 2 via a bearing, and the positioning platform 2 is slidably mounted on the left and right sides of the top surface of the tension platform 1. A bidirectional lead screw 7 is rotatably provided in the middle of the bottom surface of the tension platform 1 via a bearing, and the bidirectional lead screw 7 is threaded through the bottom end of the positioning platform 2.

[0034] The positioning mechanism also includes a positioning flip plate 13, and the lower end of the positioning flip plate 13 is rotatably mounted on the left and right sides of the top surface of the winding turntable 3 via a torsion spring. The rotating shaft end of the positioning flip plate 13 is wound and connected to the lower end of the traction steel cable 14, and the upper end of the traction steel cable 14 is fixedly connected to the lower end of the traction slider 12. In the initial state, the positioning flip plate 13 is distributed in an outward flipped inclined structure. The positioning flip plate 13 is pressed by the pressing arc frame 9 to slide the traction slider 12 downward and flip the traction steel cable 14 to loosen it. After the positioning flip plate 13 is loosened, the torsion spring resets it and drives it to rotate inward so that it fits against the outer wall of the winding column 4. The descent of the pressing arc frame 9 drives the sleeved arc plate 15 to be limited to the upper end of the positioning flip plate 13.

[0035] like Figure 7 , Figures 9-10 As shown, when the pressing arc frame 9 above the winding turntable 3 slides downward, it first contacts the traction slider 12, which is elastically connected to the inside of the pressing bracket 8 by the return spring 18, and squeezes the traction slider 12 to slide downward of the pressing bracket 8. This allows the traction slider 12 to loosen the traction steel cable 14 fixedly connected to the bottom end, and the traction steel cable 14 to loosen the positioning flip plate 13 wound at the outer end. This allows the positioning flip plate 13 to be reset by the torsion spring set at the pivot and rotate inward. After the positioning flip plate 13 rotates, it fits against the outer wall of the new material cable wound on the outside of the winding column 4, and together with the pressing arc frame 9, it drives the outer sleeve arc plate 15 at the bottom end to descend synchronously. After the positioning flip plate 13 flips, it is sleeved on the inner side of the sleeve arc plate 15, thereby preventing the new material cable from loosening and affecting the fixing effect when it is stretched later.

[0036] Example 3: To address the problems existing in the tensile testing of new material cables, this example discloses the following technical solution: a tension platform 1 used in conjunction with the testing instrument, which positions the new material cable for tensile testing after stretching; anti-rebound mechanisms are slidably installed on both the upper left and right sides of the tension platform 1, and the anti-rebound mechanism includes an anti-rebound arc frame 5, with a traction wheel 6 rotatably mounted inside the anti-rebound arc frame 5 via a one-way bearing; the anti-rebound mechanism also includes a transmission rack 16, which is slidably installed on the inner side of the winding turntable 3, and a transmission tooth block 17 is meshed with the outer side of the transmission rack 16, and the transmission tooth block 17 is fixedly installed at equal angles on the outer wall of the winding turntable 3 to drive the transmission rack 16 closer to the new material cable.

[0037] The outer end of the transmission rack 16 included in the anti-rebound mechanism is fixedly connected to the outer wall of the anti-rebound arc frame 5. The anti-rebound arc frame 5 is close to the new material cable, and the traction wheel 6 on the inner wall of the anti-rebound arc frame 5 is attached to the outer wall of the front and rear sides of the new material cable. It is used to protect the new material cable after it breaks instantly, so as to avoid the new material cable breaking and rebounding, which could cause a safety accident.

[0038] like Figures 2-4 As shown, after the end of the new material cable above the tension platform 1 is positioned by the positioning mechanism, the motor on the bottom of the positioning platform 2 drives the winding turntable 3 to rotate, so that the winding turntable 3 on the left and right sides drives the winding column 4 and the positioned new material cable to wind up, thereby causing the middle of the new material cable to be tensioned without being excessively taut.

[0039] Furthermore, the rotating winding turntables 3 on the left and right sides drive the meshing transmission rack 16 to slide through the transmission tooth block 17 on the outer wall. The transmission rack 16 drives the anti-rebound arc frame 5, which is fixedly connected to the end, to move towards the outer wall of the tensioned new material cable. At the same time, the outer wall of the new material cable enters the interior of the anti-rebound arc frame 5 and contacts the traction wheel 6 connected by the unidirectional bearings distributed at equal angles. This allows the new material cable to drive the traction wheel 6 to rotate normally during the stretching process, and the unidirectional bearing connection prevents the new material cable from resetting in the opposite direction.

[0040] Furthermore, when the new material cable undergoes tensile testing, the bidirectional lead screw 7 installed on the bottom of the tension platform 1 rotates, which drives the positioning platforms 2 connected by threads on both sides to slide outwards simultaneously, pulling the new material cable from the middle outwards. The testing instrument records the numerical value of the new material cable at the moment of breakage. The broken new material cable retracts rapidly in the opposite direction, and its outer wall is attached to the traction wheel 6 inside the anti-rebound arc frame 5. The unidirectional traction wheel 6 limits the rebound of the new material cable, thereby reducing the possibility of safety accidents.

[0041] 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 performance testing device for the production of new material cables, comprising a tensile platform (1) used in conjunction with the testing instrument body, wherein the tensile platform (1) is positioned for the new material cable and is used for tensile testing by the testing instrument after stretching; Its features are, Also includes: The tension platform (1) is provided with positioning mechanisms on both the upper left and right sides, and the positioning mechanism includes a positioning platform (2), and a winding turntable (3) is provided in the middle of the top surface of the positioning platform (2). Among them, the top surface of the winding turntable (3) is fixedly installed with winding columns (4) on both the left and right sides, and the winding columns (4) wind the new material cable in an "∞" shape. The tension platform (1) is slidably installed on both the upper left and right sides, and the anti-rebound mechanism includes an anti-rebound arc frame (5), and the anti-rebound arc frame (5) is equipped with a traction wheel (6) through a one-way bearing rotating at an equal angle inside.

2. The tensile performance testing equipment for the production of new material cables according to claim 1, characterized in that: The positioning mechanism includes a winding turntable (3) which is rotatably mounted on the top center of the positioning platform (2) via a bearing. The positioning platform (2) is slidably mounted on the left and right sides of the top surface of the tension platform (1). A bidirectional lead screw (7) is rotatably mounted on the bottom center of the tension platform (1) via a bearing. The bidirectional lead screw (7) is threaded through the bottom end of the positioning platform (2).

3. The tensile performance testing equipment for the production of new material cables according to claim 1, characterized in that: The positioning mechanism also includes a pressing bracket (8), and the pressing bracket (8) is fixedly installed on the front and rear sides of the winding turntable (3). The interior of the symmetrically distributed pressing bracket (8) is slidably connected to the outer end of the pressing arc frame (9). The pressing arc frame (9) is slidably sleeved and installed on the outside of the left and right winding columns (4). At the same time, the bottom surface of the pressing arc frame (9) is fixedly installed on both the left and right sides with a sleeved arc plate (15).

4. The tensile performance testing equipment for the production of new material cables according to claim 3, characterized in that: The positioning mechanism also includes a lifting screw (10), the upper end of which is rotatably mounted on the upper end of the pressing bracket (8), and the lower end of which is rotatably mounted on the top surface of the winding turntable (3). The lower ends of the lifting screws (10) on the front and rear sides are connected to each other through a pulley assembly (11).

5. The tensile performance testing equipment for the production of new material cables according to claim 4, characterized in that: The positioning mechanism includes a lifting screw (10) threaded through the front and rear ends of the middle part of the pressing arc frame (9), and a traction slider (12) is slidably installed inside the pressing bracket (8). The lower end of the traction slider (12) is connected to the pressing bracket (8) by a return spring (18). In the initial state, the traction slider (12) is located above the inside of the pressing bracket (8), and slides downward by the pressing arc frame (9) pressing the traction slider (12).

6. The tensile performance testing equipment for the production of new material cables according to claim 1, characterized in that: The positioning mechanism also includes a positioning flip plate (13), and the lower end of the positioning flip plate (13) is rotatably mounted on the left and right sides of the top surface of the winding turntable (3) by a torsion spring. The rotating shaft end of the positioning flip plate (13) is wound and connected to the lower end of the traction cable (14), and the upper end of the traction cable (14) is fixedly connected to the lower end of the traction slider (12).

7. The tensile performance testing equipment for the production of new material cables according to claim 6, characterized in that: In the initial state, the positioning flip plate (13) is distributed in an outward flipping inclined structure. The positioning flip plate (13) is pressed by the pressing arc frame (9) to push the traction slider (12) downward and loosen the traction cable (14). After the positioning flip plate (13) is loosened, it is reset by the torsion spring and rotated inward so as to fit against the outer wall of the coiled column (4). The descent of the pressing arc frame (9) drives the sleeved arc plate (15) to be limited to the upper end of the positioning flip plate (13).

8. The tensile performance testing equipment for the production of new material cables according to claim 1, characterized in that: The anti-rebound mechanism also includes a transmission rack (16), which is slidably mounted on the inner side of the winding turntable (3). A transmission tooth block (17) is meshed on the outer side of the transmission rack (16), and the transmission tooth block (17) is fixedly mounted at equal angles on the outer wall of the winding turntable (3) to drive the transmission rack (16) closer to the new material cable.

9. The tensile performance testing equipment for the production of new material cables according to claim 8, characterized in that: The outer end of the transmission rack (16) included in the anti-rebound mechanism is fixedly connected to the outer wall of the anti-rebound arc frame (5), and the anti-rebound arc frame (5) approaches the new material cable, and the traction wheel (6) on the inner wall of the anti-rebound arc frame (5) is attached to the outer wall of the front and rear sides of the new material cable, which is used to protect the new material cable after it breaks instantly, so as to avoid the new material cable breaking and rebounding, causing a safety accident.

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