Cable tensile strength testing device and testing process thereof

Abstract

The invention discloses a cable tensile strength testing device and a testing process thereof, and relates to the technical field of cable tensile detection.The cable tensile strength testing device comprises a main body and a hydraulic cylinder fixed to the top of the main body, a stress sensor module is fixed to the output end of the hydraulic cylinder, and the top of the main body is slidably connected with an adjusting plate and a stretching frame; the adjusting plate is fixed to one end of the stress sensor module, a rotating shaft is movably connected to the interior of the stretching frame, and gears are fixed to the two sides of the exterior of the rotating shaft. According to the cable tensile strength detection device, the hydraulic cylinder stretches out to drive the two sets of fastening plates to clamp and fasten a cable firstly, then when the clamping force of the two sets of fastening plates to the cable reaches a set value, the hydraulic cylinder continues to stretch out to drive the stretching frame to move through the adjusting plate, and therefore the tensile strength of the cable can be detected; the cable does not need to be manually clamped and fixed, so that the problem that the precision is influenced by loosening of the cable due to insufficient cable clamping force caused by manual clamping of the cable is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of cable tensile testing, and in particular to a cable tensile strength testing device and a testing process thereof. Background Art

[0002] Cable stretch testing is an important test used to evaluate the performance and quality of cables under tensile forces. Its main purpose is to determine the maximum tensile force that the cable can withstand to ensure that it will not be damaged by external stretching during actual use. For example, in power transmission, the cable may be affected by the tension between poles. If the tensile strength is insufficient, it may cause breakage and lead to power outages. The cable deformation during the stretching process is detected, including parameters such as elongation. For example, some special environments require cables to have a lower elongation to maintain stable electrical performance. The structural integrity of the cable is examined to see whether the internal conductor, insulation layer, sheath and other parts will separate or break when stretched. The cable stretching test requires the use of a cable stretching test device.

[0003] The cable tensile testing device is a device specially used to test and evaluate the tensile properties of the cable. This device is usually composed of the following main parts: the tensile drive system, which is the core part that provides the tensile force, generally including motors, reducers, screws and other components or using hydraulic power to accurately control the speed and strength of the stretching, the clamping system: used to firmly clamp the two ends of the cable to ensure that the cable will not slip during the stretching process, the measuring system: used to measure various parameters of the cable during the stretching process, such as stretching length, stretching force, deformation, etc., the control system: controls and adjusts the entire tensile testing process, including setting stretching parameters, monitoring operating status, etc.

[0004] At present, the clamping devices of many tensile testing devices need to rely on manual operation to fix the cable. This method is not only inefficient, but also has great uncertainty. Due to the limitations of manual operation, it is difficult to accurately control the clamping force applied to the clamping device, resulting in the cable's fixing and tightening force often not being uniform and stable. During the tensile testing process, as the tension gradually increases, the cable is prone to loosening or even falling off at the clamping point, which seriously affects the accuracy and reliability of cable tensile testing. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a cable tensile strength testing device and its testing process to solve the technical problem in the prior art that the cable is manually fixed by a clamping device, resulting in insufficient cable clamping and tightening force, which may cause the cable to fall off and affect the cable tensile accuracy.

[0006] To achieve the above object, the present invention provides the following technical solutions: a cable tensile strength testing device, comprising a main body and a hydraulic cylinder fixed on the top thereof, a force sensor module fixed on the output end of the hydraulic cylinder, and an adjustment plate and a stretching frame slidably connected to the top of the main body; The adjusting plate is fixed to one end of the force sensor module, the stretching frame is movably connected with a rotating shaft inside, gears are fixed on both sides of the rotating shaft, toothed plates meshing with two sets of gears are fixed on both sides of one end of the adjusting plate, a screw rod located at the inner end of the gear is fixed on the outside of the rotating shaft, and a movable plate is connected to the outside of the two sets of screw rods, and a sleeve is slidably connected to the top of the stretching frame, and the sleeve adopts two sets of two-petal structures, and connecting rods extending to the inside of the sleeves are fixed on the inside of the two sets of moving plates, and fastening plates fixed to the connecting rods are arranged on the inside of the sleeves, and springs are fixed between the outsides of the two sets of connecting rods and the sleeves; A movable cylinder is fixed on both sides of one end of the bottom of the adjustment plate, and a matching rod extending into the inside of the movable cylinder is fixed on both sides of one end of the stretching frame, and a cavity is opened inside the matching rod and the movable cylinder; An end clamping mechanism is provided at one end of the top of the main body, a distance sensor is provided between the end clamping mechanism and the sleeve, and pressure sensor modules fixedly connected to the fastening plate are movably connected to both sides of the sleeve; One end of the top of the hydraulic cylinder and the two groups of movable cylinders are connected through an inlet pipe, and a second solenoid valve is arranged on the outside of the inlet pipe near the hydraulic cylinder. The ends of the two groups of matching rods are connected through a discharge pipe, and a first solenoid valve is arranged on the outside of the discharge pipe near the ends of the two groups of matching rods. The first connecting pipe and the second connecting pipe are respectively fixed at both ends of the bottom of the hydraulic cylinder, a valve is connected to the end of the first connecting pipe, and the first connecting pipe and the second connecting pipe are respectively located at both ends of the piston.

[0007] By adopting the above technical solution, one end of the cable is first fixedly clamped by the end clamping mechanism, and then the other end thereof passes through between the two sets of sleeves. At this time, the hydraulic cylinder extends first to drive the adjustment plate and the two sets of toothed plates to move, and then the two sets of gears drive the rotating shaft to rotate, so that the two sets of screw rods rotate to drive the two sets of connecting rods and the fastening plates to move closer to each other, so that the two sets of fastening plates clamp and fasten the cable. With the increase of the clamping and fastening force, under the action of the pressure sensor module, when the clamping force of the two sets of fastening plates on the cable reaches the set value, the solenoid valve is closed, and then the hydraulic cylinder continues to extend and discharge. The hydraulic oil that comes out will stay in the movable cylinder and the matching rod. Since the end of the matching rod is closed by the solenoid valve, the hydraulic oil inside it cannot be discharged. As the adjusting plate continues to drive the movement of the two sets of movable cylinders, that is to say, the movable cylinder and the matching rod are stable with each other at this time, and no contraction will occur. Then, the adjusting plate can drive the stretching frame to move, so that the tensile strength of the cable can be tested. It can be seen from the above that the cable does not need to be clamped and fixed manually, which effectively avoids the problem of manual clamping of the cable resulting in insufficient clamping force and loosening of the cable, affecting the accuracy.

[0008] Furthermore, guide rods penetrating the movable plate are fixed on both sides of the sleeve, guide plates extending into the stretching frame are fixed at the four corners of the bottom of the sleeve, and guide holes and guide grooves matching the guide rods and guide plates are respectively provided inside the movable plate and the stretching frame.

[0009] By adopting the above technical solution, the guide rod and the guide plate both play a guiding role when the two-petal sleeve is opened, thereby avoiding the phenomenon of deviation.

[0010] Furthermore, a support frame located outside the hydraulic cylinder and fixedly connected to the hydraulic cylinder is fixed on the top of the main body, sliding rods penetrating the adjustment plate and the stretching frame are fixed on both sides of the support frame, and sliding holes matching the sliding rods are provided inside the adjustment plate and the stretching frame, sliding rails are fixed at both ends of the top of the main body, and sliding blocks extending to the inside of the sliding rails are fixed on both sides of the bottom of the adjustment plate and the stretching frame.

[0011] By adopting the above technical solution, the slide rod and the slide rail both play a role in guiding and stabilizing the movement of the adjustment plate and the stretching frame, making the overall cable stretching process more stable.

[0012] A cable tensile strength testing process, the process comprising the following steps: S1: Cable processing: First, the staff cuts a certain length of the cable, cleans its outer surface and visually inspects the condition of the cable outer surface; S2: Preliminary placement of the cable: First, fix one end of the cable through the end clamping mechanism, and then pass the other end of the cable into the sleeve. You can also manually open the two-piece sleeve and place the cable in. S3: Cable clamping process: The hydraulic cylinder starts to extend, first driving the moving plate to move, and under the action of the toothed plate, gear, screw, moving plate and connecting rod, the two sets of fastening plates clamp and fix the cable inside the sleeve; S4: Cable stretching process: When the pressure sensor module detects that the cable clamping force reaches the set value, the hydraulic cylinder continues to extend, and the stretching frame is driven to move as a whole through the adjustment plate, so that the stretching frame can drive one end of the cable to stretch relative to the other end; S5: Cable tensile strength data analysis: When the hydraulic cylinder drives one end of the cable to continuously stretch until the cable breaks, the force sensor module located at the output end of the hydraulic cylinder detects and records the instantaneous force when the cable breaks, and then converts the compressive force recorded by the force sensor module into a tensile force through the external control calculation system. At the same time, combined with the distance sensor, the deformation of the cable can be recorded.

[0013] In summary, the present invention mainly has the following beneficial effects: the present invention firstly fixes and clamps one end of the cable through the end clamping mechanism, and then the other end thereof passes through between the two sets of sleeves, at which time the hydraulic cylinder extends to first drive the adjustment plate and the two sets of toothed plates to move, and then the two sets of gears drive the rotating shaft to rotate, so that the two sets of screw rods rotate to drive the two sets of connecting rods and the fastening plates to move closer to each other, so that the two sets of fastening plates clamp and fasten the cable, and as the clamping and fastening force increases, under the action of the pressure sensor module, when the clamping force of the two sets of fastening plates on the cable reaches the set value, at this time, the solenoid valve is closed, and then the hydraulic cylinder The hydraulic oil that continues to be extended and discharged will remain inside the movable cylinder and the matching rod. Since the end of the matching rod is closed by the solenoid valve, the hydraulic oil inside it cannot be discharged. As the adjusting plate continues to drive the movement of the two sets of movable cylinders, that is to say, the movable cylinder and the matching rod are stable to each other at this time, and no contraction will occur. Then, the adjusting plate can drive the stretching frame to move, so that the tensile strength of the cable can be tested. It can be seen from the above that the cable does not need to be clamped manually, which effectively avoids the problem of manual clamping of the cable resulting in insufficient clamping force and loosening of the cable, affecting the accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the first viewing angle of the present invention; Figure 2 It is a schematic diagram of the internal enlarged structure of the present invention from a first viewing angle; Figure 3 is a schematic diagram of an internal enlarged structure of the present invention from a second viewing angle; Figure 4 It is a schematic diagram of the enlarged local structure of the present invention; Figure 5It is an enlarged partial exploded view of the present invention; Figure 6 It is a schematic diagram of a part of the structure after enlargement of the present invention; Figure 7 For the present invention Figure 6 A magnified image of point A; Figure 8 It is an enlarged view of a part of the structure of the present invention; Fig. 9 It is a schematic diagram of the structure of the stretching frame of the present invention; Fig.10 It is a structural schematic diagram of the main body of the present invention; Fig.11 It is a structural schematic diagram of the second viewing angle of the present invention.

[0015] In the figure: 1. main body; 2. hydraulic cylinder; 3. end clamping mechanism; 4. force sensor module; 5. adjustment plate; 6. stretching frame; 7. rotating shaft; 8. gear; 9. tooth plate; 10. screw rod; 11. moving plate; 12. connecting rod; 13. sleeve; 14. fastening plate; 15. spring; 16. pressure sensor module; 17. movable cylinder; 18. matching rod; 19. liquid inlet pipe; 20. first solenoid valve; 21. liquid discharge pipe; 22. first connecting pipe; 23. second connecting pipe; 24. guide rod; 25. guide plate; 26. sliding hole; 27. slider; 28. support frame; 29. ​​sliding rod; 30. slide rail; 31. second solenoid valve. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0017] The following describes an embodiment of the present invention based on its overall structure.

[0018] A cable tensile strength testing device, such as Figure 1-11 As shown, it includes a main body 1 and a hydraulic cylinder 2 fixed on the top thereof, a force sensor module 4 is fixed on the output end of the hydraulic cylinder 2, and an adjustment plate 5 and a stretching frame 6 are slidably connected to the top of the main body 1; The adjusting plate 5 is fixed to one end of the force sensor module 4, the stretching frame 6 is movably connected with a rotating shaft 7 inside, gears 8 are fixed on both sides of the outside of the rotating shaft 7, and toothed plates 9 meshing with two sets of gears 8 are fixed on both sides of one end of the adjusting plate 5, a screw rod 10 located at the inner end of the gear 8 is fixed on the outside of the rotating shaft 7, and a moving plate 11 is connected to the outside of the two sets of screw rods 10, and a sleeve 13 is slidably connected to the top of the stretching frame 6. The sleeve 13 adopts two sets of two-petal structures, and the inner sides of the two sets of moving plates 11 are fixed with connecting rods 12 extending to the inside of the sleeve 13, and the inner sides of the sleeves 13 are provided with fastening plates 14 fixed to the connecting rods 12, and springs 15 are fixed between the outer sides of the two sets of connecting rods 12 and the sleeves 13; At this time, the hydraulic cylinder 2 extends to first drive the adjustment plate 5 and the two sets of toothed plates 9 to move, and the two sets of toothed plates 9 move to mesh with the gears 8, so that the two sets of gears 8 drive the rotating shaft 7 to rotate, so that the two sets of screw rods 10 rotate and drive the two sets of connecting rods 12 and the fastening plates 14 to move closer to each other, so that the two sets of fastening plates 14 play a role in clamping and fastening the cables; A movable cylinder 17 is fixed on both sides of one end of the bottom of the adjustment plate 5, and a matching rod 18 extending into the inside of the movable cylinder 17 is fixed on both sides of one end of the stretching frame 6, and a cavity is opened inside the matching rod 18 and the movable cylinder 17; Furthermore, in the process of the two sets of fastening plates 14 clamping and fixing the cables, the first solenoid valve 20 and the second solenoid valve 31 are in an open state, and the valve connected to the end of the second connecting pipe 23 is in a closed state. At this time, the hydraulic oil at one end of the hydraulic cylinder 2 enters the two sets of movable cylinders 17 and the matching rod 18 through the liquid inlet pipe, and then is discharged to the external oil tank through the first solenoid valve 20 and the liquid discharge pipe 21; That is to say, at this time, the movable cylinder 17 slides and contracts relative to the matching rod 18, so as not to affect the movement of the adjustment plate 5 relative to the stretching frame 6. That is to say, at this time, only the movement of the adjustment plate 5 and the two sets of toothed plates 9 drives the two sets of fastening plates 14 to clamp and fix the cables through a series of structures such as the gear 8; An end clamping mechanism 3 is provided at one end of the top of the main body 1, a distance sensor is provided between the end clamping mechanism 3 and the sleeve 13, and pressure sensor modules 16 fixedly connected to the fastening plate 14 are movably connected to both sides of the sleeve 13; One end of the top of the hydraulic cylinder 2 is connected to the two groups of movable cylinders 17 through an inlet pipe 19, and a second solenoid valve 31 is provided on the outer side of the inlet pipe 19 near the position of the hydraulic cylinder 2. The ends of the two groups of matching rods 18 are connected through a discharge pipe 21, and a first solenoid valve 20 is provided on the outer side of the discharge pipe 21 near the ends of the two groups of matching rods 18. The first connecting pipe 22 and the second connecting pipe 23 are respectively fixed at both ends of the bottom of the hydraulic cylinder 2, and the ends of the first connecting pipe 22 are connected to valves, and the first connecting pipe 22 and the second connecting pipe 23 are respectively located at both ends of the piston.

[0019] See also Figure 4 and Figure 5 Guide rods 24 penetrating the movable plate 11 are fixed on both sides of the sleeve 13, guide plates 25 extending to the inside of the stretching frame 6 are fixed at the four corners of the bottom of the sleeve 13, and guide holes and guide grooves matching the guide rods 24 and the guide plates 25 are respectively provided inside the movable plate 11 and the stretching frame 6. By setting the above structure, the present invention has the guide rods 24 and the guide plates 25 both play a guiding role when the two-petal sleeve 13 is opened, thereby avoiding the phenomenon of deviation.

[0020] See also Figure 1 , Figure 6 , Fig.10 and Fig.11 A support frame 28 located outside the hydraulic cylinder 2 and fixedly connected thereto is fixed on the top of the main body 1, and slide bars 29 penetrating the adjustment plate 5 and the stretching frame 6 are fixed on both sides of the support frame 28, and slide holes 26 matching the slide bars 29 are opened inside the adjustment plate 5 and the stretching frame 6, and slide rails 30 are fixed at both ends of the top of the main body 1, and sliders 27 extending to the inside of the slide rails 30 are fixed on both sides of the bottom of the adjustment plate 5 and the stretching frame 6. The present invention sets the above structure, wherein the slide bar 29 and the slide rail 30 both play a role in guiding and stabilizing the movement of the adjustment plate 5 and the stretching frame 6, so that the overall cable stretching process is more stable.

[0021] A cable tensile strength testing process, the process comprising the following steps: S1: Cable processing: First, the staff cuts a certain length of the cable, cleans its outer surface and visually inspects the condition of the cable outer surface; S2: Preliminary placement of the cable: First, fix one end of the cable through the end clamping mechanism, and then pass the other end of the cable into the sleeve. You can also manually open the two-piece sleeve and place the cable in. S3: Cable clamping process: The hydraulic cylinder starts to extend, first driving the moving plate to move, and under the action of the toothed plate, gear, screw, moving plate and connecting rod, the two sets of fastening plates clamp and fix the cable inside the sleeve; S4: Cable stretching process: When the pressure sensor module detects that the cable clamping force reaches the set value, the hydraulic cylinder continues to extend, and the stretching frame is driven to move as a whole through the adjustment plate, so that the stretching frame can drive one end of the cable to stretch relative to the other end; S5: Cable tensile strength data analysis: When the hydraulic cylinder drives one end of the cable to continuously stretch until the cable breaks, the force sensor module located at the output end of the hydraulic cylinder detects and records the instantaneous force when the cable breaks, and then converts the compressive force recorded by the force sensor module into a tensile force through the external control calculation system. At the same time, combined with the distance sensor, the deformation of the cable can be recorded.

[0022] The working principle of the present invention is as follows: when in use, the power is turned on, and the staff first cuts the corresponding length of cable according to the type of cable to perform tensile strength test, and then visually inspects the appearance of the cut cable to ensure that it is not damaged and its surface is clean and free of foreign matter; First, one end of the cable is fixedly clamped by the end clamping mechanism 3, and then the other end thereof is passed through the two sets of sleeves 13, wherein the sleeve 13 is a two-petal structure, and one end of the cable can be directly passed through the sleeve 13, or the two sets of two-petal sleeves 13 can be manually opened to put the cable inside; Furthermore, when the two sets of two-petal sleeves 13 are opened, one side of the sleeve 13 squeezes the spring 15 to a certain extent. When the two sets of two-petal sleeves 13 are closed, the two sets of two-petal sleeves 13 are closely attached to each other under the elastic force of the two sets of springs 15, which plays a preliminary role in limiting the position of the cable and preventing the cable from falling. At this time, the hydraulic cylinder 2 extends to first drive the adjustment plate 5 and the two sets of toothed plates 9 to move, and the two sets of toothed plates 9 move to mesh with the gears 8, so that the two sets of gears 8 drive the rotating shaft 7 to rotate, so that the two sets of screw rods 10 rotate and drive the two sets of connecting rods 12 and the fastening plates 14 to move closer to each other, so that the two sets of fastening plates 14 play a role in clamping and fastening the cables; Furthermore, in the process of the two sets of fastening plates 14 clamping and fixing the cables, the first solenoid valve 20 and the second solenoid valve 31 are in an open state, and the valve connected to the end of the second connecting pipe 23 is in a closed state. At this time, the hydraulic oil at one end of the hydraulic cylinder 2 enters the two sets of movable cylinders 17 and the matching rod 18 through the liquid inlet pipe, and then is discharged to the external oil tank through the first solenoid valve 20 and the liquid discharge pipe 21; That is to say, at this time, the movable cylinder 17 slides and contracts relative to the matching rod 18, so as not to affect the movement of the adjustment plate 5 relative to the stretching frame 6. That is to say, at this time, only the movement of the adjustment plate 5 and the two sets of toothed plates 9 drives the two sets of fastening plates 14 to clamp and fix the cables through a series of structures such as the gear 8; As the clamping force increases, under the action of the pressure sensor module 16, when the clamping force of the two sets of fastening plates 14 on the cable reaches the set value, the first solenoid valve 20 and the second solenoid valve 31 are closed, and the hydraulic cylinder 2 continues to extend and the hydraulic oil discharged will stay inside the movable cylinder 17 and the matching rod 18; Since the end of the matching rod 18 is closed by the first solenoid valve 20, the hydraulic oil inside it cannot be discharged. As the adjustment plate 5 continues to drive the movement of the two sets of movable cylinders 17, that is, the movable cylinders 17 and the matching rods 18 are mutually stable at this time, and no contraction will occur. Then, the adjustment plate 5 can drive the stretching frame 6 to move, so that the tensile strength of the cable can be tested. As can be seen from the above, the clamping and fixing of the cable does not need to be manually fixed, which effectively avoids the problem of manual clamping of the cable causing insufficient clamping force of the cable, resulting in loosening of the cable and affecting the accuracy. Furthermore, during the cable stretching process, the hydraulic cylinder 2 will continue to extend, and the hydraulic oil at one end thereof will be discharged through the second connecting pipe 23. At this time, the valve connected to the end of the second connecting pipe 23 is in an open state, and the hydraulic oil can be discharged to the external oil tank through the second connecting pipe 23. Specifically, a distance sensor is provided at one end of the end clamping mechanism 3, and when the force sensor module 4 detects the maximum tensile strength of the cable, the maximum deformation of the cable at the maximum tensile strength can be calculated under the action of the distance sensor.

[0023] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A cable tensile strength testing device, comprising a main body (1) and a hydraulic cylinder (2) fixed on the top thereof, characterized in that: A force sensor module (4) is fixed to the output end of the hydraulic cylinder (2), and an adjustment plate (5) and a stretching frame (6) are slidably connected to the top of the main body (1); The adjustment plate (5) is fixed to one end of the force sensor module (4); a rotating shaft (7) is movably connected inside the stretching frame (6); gears (8) are fixed to both sides of the outside of the rotating shaft (7); toothed plates (9) meshing with two groups of gears (8) are fixed to both sides of one end of the adjustment plate (5); a screw rod (10) located at the inner end of the gear (8) is fixed to the outside of the rotating shaft (7); the outer sides of the two groups of screw rods (10) are connected to a moving plate (11); a sleeve (13) is slidably connected to the top of the stretching frame (6); connecting rods (12) extending into the inside of the sleeves (13) are fixed to the inner sides of the two groups of moving plates (11); and fastening plates (14) fixed to the inner sides of the sleeves (13); A movable cylinder (17) is fixed on both sides of one end of the bottom of the adjustment plate (5), and a matching rod (18) extending into the interior of the movable cylinder (17) is fixed on both sides of one end of the stretching frame (6), and a cavity is provided inside the matching rod (18) and the movable cylinder (17).

2. The cable tensile strength testing device according to claim 1, characterized in that: An end clamping mechanism (3) is provided at one end of the top of the main body (1), a distance sensor is provided between the end clamping mechanism (3) and the sleeve (13), and pressure sensor modules (16) fixedly connected to the fastening plate (14) are movably connected to both sides of the sleeve (13).

3. The cable tensile strength testing device according to claim 1, characterized in that: The sleeve (13) is composed of two groups of two-petal structures, and springs (15) are fixed between the outer sides of the two groups of connecting rods (12) and the sleeve (13).

4. The cable tensile strength testing device according to claim 1, characterized in that: One end of the top of the hydraulic cylinder (2) and the two groups of movable cylinders (17) are connected via a liquid inlet pipe (19), and a second solenoid valve (31) is provided on the outside of the liquid inlet pipe (19) near the hydraulic cylinder (2). The ends of the two groups of matching rods (18) are connected via a liquid discharge pipe (21), and a first solenoid valve (20) is provided on the outside of the liquid discharge pipe (21) near the ends of the two groups of matching rods (18).

5. The cable tensile strength testing device according to claim 1, characterized in that: A first connecting pipe (22) and a second connecting pipe (23) are respectively fixed at both ends of the bottom of the hydraulic cylinder (2); a valve is connected to the end of the first connecting pipe (22); and the first connecting pipe (22) and the second connecting pipe (23) are respectively located at both ends of the piston.

6. The cable tensile strength testing device according to claim 3, characterized in that: Guide rods (24) penetrating the movable plate (11) are fixed on both sides of the sleeve (13), guide plates (25) extending into the interior of the stretching frame (6) are fixed at the four corners of the bottom of the sleeve (13), and guide holes and guide grooves matching the guide rods (24) and the guide plates (25) are respectively provided inside the movable plate (11) and the stretching frame (6).

7. The cable tensile strength testing device according to claim 1, characterized in that: A support frame (28) is fixed on the top of the main body (1) and is located outside the hydraulic cylinder (2) and is fixedly connected thereto. Slide rods (29) penetrating the adjustment plate (5) and the stretching frame (6) are fixed on both sides of the support frame (28). Slide holes (26) matching the slide rods (29) are provided inside the adjustment plate (5) and the stretching frame (6).

8. The cable tensile strength testing device according to claim 1, characterized in that: Slide rails (30) are fixed to both ends of the top of the main body (1), and sliders (27) extending into the interior of the slide rails (30) are fixed to both sides of the bottom of the adjustment plate (5) and the stretching frame (6).

9. A cable tensile strength testing process, characterized in that The cable tensile strength testing device according to any one of claims 1 to 8 is used for testing, and the process comprises the following steps: S1: Cable processing: First, the staff cuts a certain length of the cable, cleans its outer surface and visually inspects the condition of the cable outer surface; S2: Preliminary placement of the cable: First, fix one end of the cable through the end clamping mechanism, and then pass the other end of the cable into the sleeve. You can also manually open the two-piece sleeve and place the cable in. S3: Cable clamping process: The hydraulic cylinder starts to extend, first driving the moving plate to move, and under the action of the toothed plate, gear, screw, moving plate and connecting rod, the two sets of fastening plates clamp and fix the cable inside the sleeve; S4: Cable stretching process: When the pressure sensor module detects that the cable clamping force reaches the set value, the hydraulic cylinder continues to extend, and the stretching frame is driven to move as a whole through the adjustment plate, so that the stretching frame can drive one end of the cable to stretch relative to the other end; S5: Cable tensile strength data analysis: When the hydraulic cylinder drives one end of the cable to continuously stretch until the cable breaks, the force sensor module located at the output end of the hydraulic cylinder detects and records the instantaneous force when the cable breaks, and then converts the compressive force recorded by the force sensor module into a tensile force through the external control calculation system. At the same time, combined with the distance sensor, the deformation of the cable can be recorded.

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