Device and method for testing tensile strength of flexible cable

Abstract

The invention relates to a flexible cable breaking force testing device and method, and belongs to the technical field of applying stable tension or pressure, and the flexible cable breaking force testing device comprises a second clamp which is used for clamping one end of a to-be-tested material; the first clamping piece is used for clamping the other end of the to-be-detected material; the clamp III is in sliding connection with the clamping piece I and is used for tensioning the to-be-tested material before testing; the first clamp is connected with the third clamp in a sliding mode, and the first clamp is arranged in the first sliding rail in a sliding mode; the first lead screw is rotationally arranged in the first sliding rail, and a rotating pipe in threaded fit with the first lead screw is rotationally arranged in the first clamp; the second lead screw is rotationally arranged in the first clamp, and the second lead screw is in threaded fit with the third clamp; the first transmission rod and the second transmission rod are arranged in the first clamp in a sliding mode. The transmission rod I is used for limiting the rotating pipe; the second transmission rod is used for being connected with the second lead screw to enable the second lead screw to rotate. The device has the effect of providing stable tension for the flexible cable test process through an automatic means.

Description

Technical Field

[0001] This application relates to the technical field of applying stable tension or pressure, and in particular to a device and method for testing the breaking force of a flexible cable. Background Technology

[0002] The tensile strength test of flexible cables simulates the performance of flexible cables under different stresses by applying force. Typically, one end of the flexible cable sample for the tensile strength test is fixed, and the other end is gradually tensioned until it breaks, in order to measure the maximum tensile strength and other parameters of the flexible cable.

[0003] Before conducting the tensile strength test, it is necessary to ensure that the axis of the flexible cable is perpendicular to the plane of the clamp, and that the axes of the two clamps holding the flexible cable are collinear. At the same time, the axis of the clamp should be collinear with the axis of the flexible cable to ensure that the tensile force is evenly distributed during the test and to avoid test errors caused by incorrect clamp position.

[0004] However, the above-mentioned debugging process usually requires manual operation with the help of optical instruments. Operators need to adjust the position of each fixture one by one, which depends on the operator's experience and skill level. It has poor repeatability and low efficiency. Summary of the Invention

[0005] In order to provide stable tension for flexible cables through automation during tensile force testing, this application provides a device and method for testing the tensile force of flexible cables.

[0006] The technical solution of the flexible cable tensile strength testing device and method provided in this application is as follows:

[0007] A device for testing the tensile strength of a flexible cable, comprising:

[0008] Clamp two is used to hold one end of the material to be tested;

[0009] Clamping component one, used to clamp the other end of the material to be tested;

[0010] Clamp three is slidably connected to clamping member one and is used to tension the material to be tested before testing;

[0011] The fixture is slidably connected to the fixture, and the fixture is slidably disposed within the slide rail.

[0012] A lead screw is rotatably mounted inside the slide rail, and a rotating tube that is threadedly engaged with the lead screw is rotatably mounted inside the clamp.

[0013] Screw 2 is rotatably mounted inside clamp 1, and screw 2 is threadedly engaged with clamp 3;

[0014] Transmission rod one and transmission rod two are slidably disposed within the clamp one; transmission rod one is used to limit the rotation of the rotating tube; transmission rod two is used to connect with the lead screw two to make the lead screw two rotate.

[0015] Optionally, the bottom of the second clamp is provided with a second clamping member, which is connected to a tension sensor.

[0016] Optionally, the clamping member one includes: a vertical plate;

[0017] A rotating plate is rotatably connected to the vertical plate;

[0018] A positioning hole and a receiving hole are respectively provided on the rotating plate and the vertical plate, and the positioning hole and the receiving hole are connected; the material to be tested enters the receiving hole through the positioning hole;

[0019] The fixing components, respectively disposed on the rotating plate and the vertical plate, include two clamping plates for fixing the material to be tested.

[0020] Optionally, the fixing component further includes a magnetic sheet, which, when energized, moves the adsorption clamp closer to the material to be tested; a contact switch connected to the magnetic sheet is provided on the vertical plate.

[0021] Optionally, a semi-toothed ring is coaxially fixed to one side of the rotating plate; a drive wheel is rotatably mounted on the vertical plate, and the drive wheel meshes with the semi-toothed ring; a drive motor is fixedly mounted on the vertical plate; and the drive motor is connected to the drive wheel.

[0022] Optionally, the bottom end of the clamp three is provided with a slide rail three; a resistance wire is wound inside the slide rail three and a metal rod is fixedly connected thereto; a sliding piece is fixedly provided at the top end of the clamping member one, and the sliding piece is in electrical contact with the resistance wire and the metal rod respectively.

[0023] Optionally, the transmission rod is an electromagnet, and a metal patch that can be attracted to the electromagnet is fixed on the rotating tube; the resistance wire is electrically connected to the transmission rod through a comparator and a relay.

[0024] Optionally, a telescopic tube is rotatably provided on the second transmission rod, and the telescopic tube is slidably connected to the second lead screw.

[0025] Optionally, the clamp is provided with a transmission gear set, the transmission gear set comprising:

[0026] A first transmission gear is slidably connected to a first lead screw.

[0027] The transmission gear three and the transmission rod two are respectively provided with connecting parts. After the two connecting parts are connected, the telescopic tube rotates with the transmission gear three.

[0028] The second transmission gear meshes with the first transmission gear and the third transmission gear, respectively.

[0029] The technical solution for testing the tensile strength of a flexible cable provided in this application is as follows:

[0030] The tensioning of the flexible cable was adjusted using a flexible cable breaking force testing device.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] This application's automated clamping system and drive motor achieve automatic clamping and positioning of materials: the coaxial arrangement of clamping component one and clamping component two ensures that the two clamping components maintain the correct axial position throughout the testing process; the material to be tested is confined within the receiving hole, ensuring that the fixed end of the material to be tested is coaxially aligned with the clamping components. Then, by stretching the material to be tested, the axial direction of the material to be tested is made perpendicular to the longitudinal interface of the receiving hole; the above operations are completed automatically, reducing the time and workload of manual adjustments and improving testing efficiency; at the same time, it ensures that the material to be tested is subjected to uniform force during the testing process, reducing measurement errors. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the flexible cable tensile strength testing device according to an embodiment of this application.

[0034] Figure 2 This is a structural schematic diagram of fixture one of the embodiments of this application.

[0035] Figure 3 This is a schematic diagram of the structure of fixture three in the embodiment of this application.

[0036] Reference numerals in the attached diagram: 1. Fixture 1; 2. Fixture 2; 3. Slide rail 1; 4. Slide rail 2; 5. Fixture 3; 6. Clamping component 1; 7. Clamping component 2; 8. Vertical plate; 9. Rotating plate; 10. Semi-gear ring; 11. Drive motor; 12. Drive wheel; 13. Positioning hole; 14. Receiving hole; 15. Clamping plate; 16. Lead screw 1; 17. Lead screw 2; 18. Slide rail 3; 19. Connecting component; 20. Tension sensor; 21. Magnetic sheet 2; 22. Placement hole; 23. Test motor; 24. Guide hole; 25. Through hole; 26. Transmission gear 2; 27. Transmission gear 3; 28. Transmission gear 1; 29. ​​Telescopic tube; 30. Transmission rod 1; 31. Transmission rod 2; 32. Rotating tube. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0038] This application discloses a device and method for testing the tensile strength of a flexible cable. The device includes a clamp 1 and a clamp 2 for holding the material to be tested, and a slide rail 3 for moving the clamp 1. The bottom of the clamp 1 is provided with the slide rail 2, and a clamp 3 slidably disposed within the slide rail 2 along the length of the clamp 1. A clamping member 6 is slidably disposed at the bottom of the clamp 3 5. The clamp 2 is fixedly connected to the top platform of the testing device. Specifically, the clamps 1 and 2 are respectively connected to the material to be tested. Then, the clamp 1 moves away from the clamp 2, causing the material to stretch to the breaking state, and the tensile force of the material at the breaking state is recorded.

[0039] The bottom of clamp 2 is provided with clamping member 2 7, which has the same structure as clamping member 6. Clamping member 6 and clamping member 2 7 are coaxially arranged in the horizontal direction. Clamping member 6 includes a vertical plate 8 and a rotating plate 9 disposed on one side of the vertical plate 8. The vertical plate 8 and the rotating plate 9 are coaxially rotatably connected. In this embodiment, a semi-toothed ring 10 is coaxially disposed at the connection end of the vertical plate 8 and the rotating plate 9. The semi-toothed ring 10 is fixedly connected to the rotating plate 9 and rotatably connected to the vertical plate 8. The central angle of the semi-toothed ring 10 is greater than 180°. A drive motor 11 is fixedly disposed on the vertical plate 8. The output shaft of the drive motor 11 is fixedly connected to a drive wheel 12 that meshes with the semi-toothed ring 10. Preferably, the vertical plate 8 is provided with a groove that can accommodate the semi-toothed ring 10 and the drive wheel 12. Preferably, the output shaft of the drive motor 11 passes through the vertical plate 8 and extends between the vertical plate 8 and the rotating plate 9.

[0040] Both the vertical plate 8 and the rotating plate 9 have positioning holes 13 formed along their radial direction. The positioning holes 13 extend along the outer circumference of the vertical plate 8 or the rotating plate 9 to its axis. Specifically, the width of the positioning hole 13 is the same as the width of the material to be measured, so that the material to be measured can move along the positioning hole 13 to the center position of the vertical plate 8 or the rotating plate 9. The axis of the vertical plate 8 and the rotating plate 9 has a receiving hole 14 that connects to the positioning hole 13.

[0041] Specifically, after the material to be tested is held to a certain height by a manual or mechanical gripper, it is moved horizontally and fed into the receiving hole 14 along the positioning hole 13. Then, the drive motor 11 is started, and the drive motor 11 controls the drive wheel 12 to rotate a unit number of revolutions and then stop, so that the rotating plate 9 rotates 180° relative to the vertical plate 8. After the rotation stops, the rotating plate 9 and the positioning hole 13 on the vertical plate 8 are collinear in opposite directions, and the material to be tested is confined within the receiving hole 14 of the rotating plate 9 and the vertical plate 8. Preferably, the drive motor 11 is a stepper motor. After the drive motor 11 controller is started, it outputs a pulse signal with a fixed displacement to the drive motor 11, controlling the output shaft of the drive motor 11 to rotate a fixed number of revolutions and then stop rotating.

[0042] Furthermore, the robotic arm can be a dual-arm robotic arm, specifically including a robotic arm and grippers located at the ends of the robotic arms. After the two grippers respectively grasp two non-overlapping points on the outer circumference of the material to be tested, the material is transferred into gripper 6 or gripper 7. When the robotic arm rises until the grippers are at the same horizontal level as the receiving hole 14 of the vertical plate 8, the distance between the two grippers is consistent with the distance between gripper 6 and gripper 7, allowing the grippers to move towards the vertical plate 8, and the connection point between the grippers and the material to be tested is inserted into the positioning hole 13. The grippers include two parallel robotic claws, each gripping the material to be tested; the distance between the two robotic claws is greater than the horizontal thickness of gripper 6 or gripper 7, so that when the grippers insert the material to be tested into the positioning hole 13, the two robotic claws are located on opposite sides of gripper 6 or gripper 7; before gripper 6 or gripper 7 completes the fixation of the material to be tested, the grippers provide balance for the material.

[0043] Fixing components are respectively provided on the opposite back sides of the vertical plate 8 and the rotating plate 9. The fixing components include two symmetrically arranged clamping plates 15. The two clamping plates 15 can move vertically towards the receiving hole 14. Specifically, the side walls of the vertical plate 8 and the rotating plate 9 are provided with guide grooves, and the side walls of the clamping plates 15 are fixed with guide plates that are slidably connected to the guide grooves. A magnetic plate is fixed in the guide groove, and a metal plate that can be magnetically attracted to the magnetic plate is provided on the guide plate; the magnetic plate is an electromagnet; when the magnetic plate is energized, it moves the guide plate towards the receiving hole 14 by attracting the metal plate. A tension spring is fixed in the guide groove, and the tension spring is fixed to the guide plate to drive the guide plate to move away from the magnetic plate. Preferably, the guide block and the guide groove are a dovetail block and a dovetail groove, respectively.

[0044] Specifically, once the magnetic sheet is powered on, the two opposing clamping plates 15 move toward the receiving hole 14, and the horizontal end faces of the two clamping plates 15 after moving come into contact with each other, clamping and fixing the material to be tested by squeezing it.

[0045] A contact switch is installed on the circuit connecting the magnetic plate to the power supply. The contact switch is located between the vertical plate 8 and the rotating plate 9. Specifically, the contact switch is located on the side wall of the vertical plate 8 facing the rotating plate 9. The rotating plate 9 has a recessed hole for inserting the contact switch. When the rotating plate 9 rotates until the positioning hole 13 of the rotating plate 9 and the positioning hole 13 of the vertical plate 8 are aligned but not coincident, the recessed hole and the contact switch are aligned, and the contact switch is inserted into the recessed hole. When the contact switch is inserted into the recessed hole, the contact switch is in the conducting state; after the rotating plate 9 continues to rotate, the contact switch separates from the recessed hole, and the contact switch is in the disengaged state. It should be noted that the contact switch contains a spring, and the end of the contact switch is rounded, so that when the rotating plate 9 rotates, the rounded corner of the contact switch separates from the recessed hole by pressing against the inner wall of the recessed hole.

[0046] Specifically, after the drive motor 11 controls the rotating plate 9 to rotate, when the positioning hole 13 on the rotating plate 9 and the positioning hole 13 on the vertical plate 8 are located on both sides of the material to be tested, and the two positioning holes 13 are collinear, the contact switch is inserted into the concave hole, and the magnetic sheet 1 is in the conductive state, the clamping plate 15 moves and clamps the material; after the rotating plate 9 continues to rotate, the contact switch separates from the concave hole, the magnetic sheet 1 is de-energized, and the tension spring controls the two clamping plates 15 to reset.

[0047] A lead screw 16 is rotatably mounted inside slide rail 3, and clamp 1 is threadedly engaged with lead screw 16. A lead screw 17 is rotatably mounted inside slide rail 4, and clamp 5 is threadedly engaged with lead screw 17. A slide rail 18 is provided at the bottom end of clamp 5. A sliding piece is fixedly mounted at the top of clamping member 6, and the sliding piece is slidably mounted inside slide rail 18 along the length of clamp 5. The inner wall of slide rail 18 is made of insulating material or coated with an insulating coating. The cross-section of slide rail 18 is circular, and a resistance wire is wound around the inner circumference of the slide rail. The resistance wire is spirally distributed throughout the inner wall of slide rail 18. A metal rod is fixedly mounted inside slide rail 18 along the length of clamp 5. The sliding piece is sleeved around the metal rod and slidably connected to the metal rod. The sliding piece is made of metal, and its outer circumference is in contact with the resistance wire. At least one end of the resistance wire and at least one end of the metal rod are respectively provided with a terminal. In this embodiment, the resistance wire is connected to the circuit near the terminal of the clamping member 2 7, so that when the slider moves towards the clamping member 2 7, the length of the resistance wire connected to the circuit becomes shorter.

[0048] The second clamp 2 provides support for the second clamping member 7, and the second clamping member 7 slides in conjunction with the second clamp 2. The vertical plate 8 of the second clamping member 7, away from the side wall of the first clamping member 6, is connected to the tension sensor 20. Specifically, the tension sensor 20 is fixed to the downward-extending vertical wall of the clamp 2, and the tension sensor 20 is coaxially arranged with the receiving hole 14 of the vertical plate 8. A magnetic sheet 21, which is an electromagnet, is fixed to the end of the tension sensor 20. A metal sheet that can be attracted to the magnetic sheet 21 is fixed on the clamping plate 15 of the second clamping member 7. It should be noted that the magnetic sheet 21 is annular, and a retention hole 22 is provided at the bottom of the annular shape of the magnetic sheet 21, which allows the part of the material to be tested that exceeds the clamping plate 15 to pass through when the magnetic sheet 21 is connected to the clamping plate 15.

[0049] A test motor 23 is fixedly mounted on one end of slide rail 3. The output shaft of the test motor 23 is coaxially fixed to lead screw 16, which drives lead screw 16 to rotate. A cavity is formed inside fixture 1, located above slide rail 4. A rotating tube 32 is rotatably mounted inside the cavity. One end of the rotating tube 32 is rotatably connected to the inner wall of the cavity, and the rotating tube 32 is sleeved around the lead screw 16, with a threaded engagement between the rotating tube 32 and the lead screw 16. Specifically, when the rotating tube 32 is in the limited position, the fixture 1 moves through the threaded engagement between the rotating tube 32 and the lead screw 16; when the rotating tube 32 is in the non-limited position, fixture 1 stops moving.

[0050] A transmission gear set is provided on the outer wall of the fixture 1 near the test motor 23; the transmission gear set includes several meshing transmission gears. Transmission gear 28 is sleeved around the lead screw 16, and is slidably connected to the lead screw 16. Specifically, a guide hole 24 is provided around the lead screw 16, and a through hole 25 for accommodating the lead screw 16 is provided on the shaft of transmission gear 28. A guide plate, slidably connected to the guide hole 24, is fixed on the inner circumferential surface of the through hole 25. In this embodiment, the transmission gear set includes three meshing transmission gears from top to bottom: transmission gear 28, transmission gear 26, and transmission gear 27, such that transmission gear 28 and transmission gear 27 rotate in the same direction.

[0051] The fixture 1 contains a partition plate separating the cavity and the slide rail 4. A vertically penetrating transmission hole is provided on the partition plate, and a transmission rod 30 is slidably mounted within the transmission hole along the length of the fixture 1. The transmission rod 30 extends upward into the cavity; the transmission rod 30 is an electromagnet, and a metal patch 1, which can be attracted to the electromagnet, is fixed to the end of the rotating tube 32 facing the drive motor 11. When the transmission rod 30 is energized, it limits the rotating tube 32 by attracting the metal patch 1. A metal patch 2 is fixed to the inner wall of the transmission hole away from the test motor 23. When the transmission rod 30 is energized, it moves towards the rotating tube 32 by attracting the metal patch 2; preferably, the transmission rod 30 fits against the rotating tube 32 after moving. A return spring is fixed within the transmission hole to drive the transmission rod 30 to return to its original position away from the rotating tube 32 after the power is de-energized.

[0052] A transmission rod 31 is integrally formed vertically at the bottom end of transmission rod 30. A telescopic tube 29 is inserted through the end of transmission rod 31 near the lead screw 17, and is rotatably connected to transmission rod 31. The telescopic tube 29 is slidably connected to the end of lead screw 17, used to drive lead screw 17 to rotate; preferably, the end of lead screw 17 has a telescopic groove for accommodating the telescopic tube 29, and both the end of telescopic tube 29 and the longitudinal section of the telescopic groove are polygonal, such as triangular or square. Connecting parts 19 are fixed to transmission gear 27 near lead screw 17 and to the telescopic tube 29 away from lead screw 17, respectively. The connecting parts 19 of transmission gear 27 penetrate the side wall of clamp 1 and extend into slide rail 4; after transmission rod 31 moves away from lead screw 17, the two connecting parts 19 mesh, causing the telescopic tube 29 to rotate with transmission gear 27.

[0053] Specifically, the end face of the connecting member 19 of the transmission gear 3 27 has several meshing teeth evenly distributed along its circumference, and the connecting member 19 of the telescopic tube 29 has several meshing grooves evenly distributed along its circumference. The two connecting members 19 are engaged by meshing teeth and meshing grooves.

[0054] The terminals of the resistance wire are electrically connected to the transmission rod 30 via a comparator, a relay, and a reference voltage. Specifically, the terminals of the resistance wire are connected to one input terminal of the comparator, and the other input terminal is connected to a reference voltage. The output terminal of the comparator is connected to the relay coil, and the transmission rod 30 is connected to the normally open or normally closed contact of the relay. In this embodiment, the terminal of the resistance wire near the clamping member 7 is connected to the inverting input terminal of the comparator, and the reference voltage is connected to the non-inverting input terminal of the comparator. After the slider moves closer to the clamping member 7, the input voltage of the resistance wire received by the comparator decreases. When the input voltage is less than the reference voltage, the comparator outputs a high level to the relay. The transmission rod 30 is connected to the normally open contact of the relay. After receiving the high-level signal, the relay controls the transmission rod 30 to be energized. The transmission rod 30 is connected to the rotating tube 32 and provides a limit for the rotating tube 32.

[0055] Furthermore, test motor 23 starts, driving transmission gear 27 to rotate via the transmission gear set; at this time, the connecting piece 19 of transmission gear 27 and the connecting piece 19 of telescopic tube 29 are engaged, and transmission rod 30 is de-energized. Through the engagement of the two connecting pieces 19, lead screw 17 rotates, causing clamp 5 to move away from clamping member 7. When clamp 5 moves to the point where the material to be tested is in an extended state and its axial direction is perpendicular to the plane of clamping member 6, clamping member 6 moves relative to clamp 35 towards clamping member 7. After clamping member 6 and the slider move, the input voltage received by the comparator decreases. When the input voltage is lower than the reference voltage, the relay controls transmission rod 30 to be energized, and transmission rod 30 limits the rotating tube 32 via magnetic adsorption; the limited rotating tube 32 engages with lead screw 16 and drives clamp 1 to move away from clamping member 7, performing a tensile force test.

[0056] A magnetic sheet (magnetic iron) is fixed to the bottom surface of clamp 3 5; a metal block that can be attracted to the magnetic sheet is fixed to the top surface of the vertical plate 8 of clamping member 1 6. The magnetic sheet is connected in series with the transmission rod 1 30, so that when the transmission rod 1 30 is energized, the magnetic sheet is energized synchronously and magnetically attracts the vertical plate 8, thus fixing clamping member 1 6.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for testing the tensile strength of a flexible cable, characterized in that, include: Clamp 2 (2) is used to clamp one end of the material to be tested; Clamping component 1 (6) is used to clamp the other end of the material to be tested; Clamp three (5) is slidably connected to clamp one (6) and is used to tension the material to be tested before testing; Clamp 1 (1) and slide rail 1 (3), the clamp 1 (1) and the clamp 3 (5) are slidably connected, the clamp 1 (1) is slidably disposed in the slide rail 1 (3); A lead screw (16) is rotatably disposed in the slide rail (3), and a rotating tube (32) that is threadedly engaged with the lead screw (16) is rotatably disposed in the clamp (1). Screw 2 (17) is rotatably disposed in clamp 1 (1) and screw 2 (17) is threadedly engaged with clamp 3 (5); Transmission rod one (30) and transmission rod two (31) are slidably disposed in the clamp one (1); transmission rod one (30) is used to limit the rotating tube (32); transmission rod two (31) is used to connect with the lead screw two (17) to make the lead screw two (17) rotate.

2. The flexible cable tensile strength testing device according to claim 1, characterized in that: The bottom of the clamp two (2) is provided with a clamping member two (7), and the clamping member two (7) is connected to the tension sensor (20).

3. The flexible cable tensile strength testing device according to claim 1, characterized in that, The clamping member one (6) includes: Vertical board (8); The rotating plate (9) is rotatably connected to the vertical plate (8); Positioning hole (13) and receiving hole (14) are respectively provided on the rotating plate (9) and the vertical plate (8), and the positioning hole (13) and the receiving hole (14) are connected; the material to be tested enters the receiving hole (14) through the positioning hole (13); The fixing components are respectively set on the rotating plate (9) and the vertical plate (8), including two clamping plates (15) for fixing the material to be tested.

4. The flexible cable tensile strength testing device according to claim 3, characterized in that: The fixing component also includes a magnetic sheet, which, when energized, causes the adsorption clamp (15) to move toward the material to be tested; the vertical plate (8) is provided with a contact switch connected to the magnetic sheet.

5. The flexible cable tensile strength testing device according to claim 3, characterized in that: A half-tooth ring (10) is coaxially fixed to one side of the rotating plate (9); a drive wheel (12) is rotatably mounted on the vertical plate (8), and the drive wheel (12) meshes with the half-tooth ring (10); a drive motor (11) is fixed on the vertical plate (8); the drive motor (11) is connected to the drive wheel (12).

6. The device for testing the tensile strength of a flexible cable according to claim 1, characterized in that: The bottom end of the clamp three (5) is provided with a slide rail three (18); a resistance wire is wound inside the slide rail three (18) and a metal rod is fixedly connected thereto; a sliding piece is fixed at the top end of the clamping member one (6), and the sliding piece is in electrical contact with the resistance wire and the metal rod respectively.

7. The flexible cable tensile strength testing device according to claim 6, characterized in that: The transmission rod (30) is an electromagnet, and a metal patch that can be attracted to the electromagnet is fixed on the rotating tube (32); the resistance wire is electrically connected to the transmission rod (30) through a comparator and a relay.

8. The device for testing the tensile strength of a flexible cable according to claim 1, characterized in that: A telescopic tube (29) is rotatably mounted on the transmission rod (31), and the telescopic tube (29) is slidably connected to the lead screw (17).

9. A flexible cable tensile strength testing device according to claim 8, characterized in that: The clamp (1) is provided with a transmission gear set, which includes: Transmission gear one (28) is slidably connected to the lead screw one (16); The transmission gear three (27) and the transmission rod two (31) are respectively provided with connecting parts (19). After the two connecting parts (19) are connected, the telescopic tube (29) rotates with the transmission gear three (27). Transmission gear two (26) meshes with transmission gear one (28) and transmission gear three (27) respectively.

10. A method for testing the tensile strength of a flexible cable, characterized in that: The tensioning test device for flexible cables as described in any one of claims 1-9 is used to perform the tensioning test of the flexible cable.

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