Measuring device for measuring the flexibility of a rope

Abstract

The application discloses a kind of measuring device of measuring the flexibility of rope cable, belong to the technical field of rope cable test, the compression performance and bending performance of the present device can test the rope cable, the device includes device frame, rope cable clamping device, display screen, bending angle protractor, lever device and leveling device, the bending flexibility of the rope is tested by two aspects, one is the compression plate on the rope cable clamping device and the clamping plane clamps the cable to be detected a, it is compressed to cause its deformation in process, sensor can perceive the hardness of the rope, namely flexibility, on the other hand, the torque measuring device of the cable to be detected a is carried out by the combination of semicircular flat plate of bending angle protractor and lever device, after the one end of the cable to be detected a is clamped by compression plate and clamping plane, the other end is along the circular trajectory motion groove rotation, namely bending, the operation of this device is simple, repeatability and reproducibility are excellent, and application prospect is wide.

Description

Technical Field

[0001] This invention relates to the field of rope and cable testing technology, and in particular to a testing device for the bending and compression properties of ropes and cables. Background Technology

[0002] Currently, there are no specific testing methods or devices for testing the bending and compression properties of ropes. The methods for measuring the bending and compression properties of ropes can be referenced from those used for measuring the bending and compression properties of general textiles.

[0003] According to GB / T 24442 "Determination of Compression Properties of Textiles", the test methods for the compression properties of textiles include the constant method and the constant speed method: Constant method A involves applying constant light and heavy pressures to the sample on the reference plate at a certain speed, maintaining the pressure for a specified time, and recording the thickness values ​​under the two pressures; Constant method B involves compressing the sample at a certain speed until the specified compression deformation is reached, and then stopping the compression, recording the pressure values ​​at that moment and after maintaining the deformation for a certain time; The constant speed method involves continuously compressing the sample on the reference plate at a certain speed, and when the pressure increases from zero to the maximum pressure, the presser foot returns at the same speed, recording the compression performance indicators by recording the constant pressure thickness, compression work, and recovery work during the above process.

[0004] According to GB / T18318 "Determination of Bending Properties of Textiles", the testing methods for the bending properties of textiles include the inclined plane method, heart-shaped method, Gladley method, cantilever method, pure bending method, and saddle method. The inclined plane method involves placing a rectangular specimen on a horizontal platform, keeping the specimen's long axis parallel to the platform's long axis, and advancing the specimen along the platform's long axis until it extends beyond the platform and bends under its own weight, with the extended end suspended in the air. The bending stiffness is calculated by measuring the length of the specimen when its head passes the leading edge of the platform and reaches an inclined plane at a 41.5° angle to the horizontal. The heart-shaped method involves folding the ends of a long strip specimen in the opposite direction and clamping it onto a test frame, suspending the specimen in a heart shape. The bending performance of the specimen is measured by determining the height of the heart-shaped ring. The Gladley method involves clamping a specimen of specified dimensions onto a specimen holder with a swingable specimen rod. The specimen bends under external force, and the force required for the specimen to leave the pendulum's tongue is measured. The cantilever method involves placing the specimen... One end of the sample is clamped in a clamp, and the other end contacts a bending plate. The clamp rotates under the action of an external force, causing the sample to bend at a certain angle. The bending performance is measured by measuring the bending moment corresponding to this angle. The pure bending method refers to fixing one end of the sample and clamping the other end with a moving chuck, rotating it at a constant speed along a fixed track at a certain angle. The relationship between the bending moment per unit width and the curvature of the sample is obtained, and the bending stiffness and bending hysteresis of the sample are calculated from this. The principle of the saddle method is to clamp both ends of a sample of a certain size onto a sample holder, so that the sample is in the shape of a semi-circular vertical ring. A certain load is applied to the ring-shaped part. Under the action of the constraint, the sample bends downward to a specified displacement and then recovers. The bending force and rebound rate corresponding to the sample bending to a certain displacement are measured.

[0005] The methods described above for testing compression and flexibility are not convenient and efficient for testing ropes and cables. For example, the constant method B for compression testing cannot guarantee that the rope and cable will not shift during the measurement process; in the inclined plane method for bending testing, the rope and cable's outer surface is touched on the inclined plane, not the central axis, which leads to inaccurate measurement data; the heart-shaped method and saddle method for bending testing are inconvenient to prepare samples due to the relatively large diameter of the rope and cable; and the Gladley method for bending testing can lead to measurement errors due to the relatively large weight of the rope and cable.

[0006] Currently, due to the lack of specific testing methods for the flexibility of ropes and cables, it is impossible to conveniently and accurately measure the quality of their flexibility. Therefore, there is an urgent need for a simple, accurate, and efficient testing device for measuring the flexibility of ropes and cables. Summary of the Invention

[0007] To address the aforementioned problems, this invention discloses a measuring device for measuring the flexibility of ropes and cables, which can solve the current problem of a lack of experimental equipment for testing the bending and compressive properties of rope and cable materials.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows: A measuring device for measuring the flexibility of a rope includes a frame, a rope clamping device, a bending angle protractor, a lever device, and a leveling device. The leveling device is installed at the bottom of the frame, forming an L-shape with it. The rope clamping device includes a motor, a push rod, a connecting unit, a sensor, a pressure plate, a clamping plane, and a display screen. The upper end of the motor is fixed to the frame, and the lower end is connected to the upper end of the push rod. The upper end of the connecting unit is connected to the lower end of the push rod, and the lower end is connected to the sensor. The sensor is mounted on the disc-shaped pressure plate. The clamping plane is fixed to the frame and located directly below the pressure plate. Both the pressure plate and the clamping plane are parallel to the horizontal plane. The bending angle protractor is perpendicular to the horizontal plane, mounted on the frame, and located below the clamping plane. The bending angle is measured... The device includes a semi-circular plate with a semi-circular motion groove around its perimeter. A lever device is installed in the semi-circular motion groove and can move within it. A display screen is mounted on the device frame and electrically connected to the sensor to receive data read by the sensor. One end of the cable to be tested is placed between the pressure plate and the clamping plane. The motor is started, and the motor shaft drives the push rod to move up and down linearly, which in turn drives the connecting unit, sensor, and pressure plate to move up and down linearly, thereby controlling the distance between the pressure plate and the clamping plane. This allows for clamping and fixing or releasing one end of the cable to be tested. The lever device is connected to the other end of the cable to be tested. The center of the semi-circular plate coincides with the farthest extension of the cable to be tested, which is clamped between the pressure plate and the clamping plane. By using a bending angle protractor, lever device, and cable clamping device in conjunction, the bending and compression properties of the cable to be tested can be measured, and the data is displayed on the display screen in real time via the sensor, providing a clear and easy-to-understand reading.

[0009] As a further improvement of the present invention, the device frame includes a rectangular structural frame, crossbeams, a rectangular structural metal base plate, and ribs. The rectangular structural frame is the main body of the device frame. Two crossbeams are fixed to the rectangular structural frame from top to bottom. The upper crossbeam is used to fix the upper end of the motor of the cable clamping device. The display screen is also detachably connected to the upper crossbeam and located on one side of the motor. The lower crossbeam is used to fix the upper end face of the bending angle protractor. The rectangular structural metal base plate is a support plate for the device frame, used to support the entire measuring device for measuring the flexibility of the cable. The leveling device is detachably installed at the four corners of the rectangular structural metal base plate. The rectangular structural frame and the rectangular structural metal base plate are perpendicular to each other, and the right angles formed are fixed using the four ribs. The two crossbeams and the rectangular structural metal base plate are parallel to each other and parallel to the horizontal plane. This structure ensures the stability of the entire frame, thereby guaranteeing the accuracy of the data output.

[0010] As a further improvement of the present invention, the bending angle protractor is a semi-circular protractor with a scale from 0° to 180°, and the angles are distributed from small to large from the end of the cable being clamped away from the end of the cable being tested to the end of the cable being clamped. The bending angle of the cable can be measured, thereby determining the bending performance of the cable.

[0011] As a further improvement of the present invention, the lever device includes a lever, a tongue, a fixing screw, a nut, a washer, and an elastic pad. The tongue is fixedly connected to the lever and detachably connected to the semi-circular trajectory movement groove on the semi-circular plate through the fixing screw and the nut. The washer and the elastic pad are located on both sides of the semi-circular plate and are respectively installed between the lever and the semi-circular plate, and between the semi-circular plate and the nut. The tongue is connected to the other end of the cable to be tested. After installation, the lever device can move along the semi-circular trajectory movement groove of the semi-circular plate.

[0012] As a further improvement of the present invention, the leveling device includes leveling bolts, leveling nuts, springs, and a circular bubble level. Each of the four corners of the rectangular metal base plate has threaded holes that match the external threads of the leveling bolts. The leveling bolts, leveling nuts, and springs are grouped together, with four groups in total, each corresponding to one of the four threaded holes in the rectangular metal base plate. The circular bubble level is installed on the upper surface of the rectangular metal base plate. By observing the circular bubble level, each group of leveling nuts is adjusted to ensure that the upper surface of the rectangular metal base plate is always in a horizontal position.

[0013] As a further improvement of the present invention, the sensor is a pressure sensor that can monitor in real time the displacement value of the cable to be tested clamped between the pressure plate and the clamping plane from the start of compression until it is fully compressed, measure the pressure of the clamping cable in real time, and calculate the distance from the pressure data change position to the pressure plate, i.e. the diameter of the clamping cable to be measured.

[0014] As a further improvement of the present invention, the contact surfaces of the pressure plate and the clamping plane are both made of materials with high flatness, high rigidity and wear resistance, and the lower surface of the end of the clamping plane is rounded to avoid the bending of the cable to be tested due to the thickness of the pressure plate.

[0015] As a further improvement of the present invention, the diameter of the semi-circular trajectory motion groove of the bending angle protractor is greater than or equal to the length of the extended portion of the cable to be tested, and the device frame is a metal frame.

[0016] The beneficial effects of this invention are as follows: (1) Effectively realizes the testing of flexibility of special, three-dimensional, and slender textiles such as ropes and cables; (2) The experimental results are concise and clear, all data are displayed by the sensor, and the data results are accurate and the reading is efficient; (3) The test range is wide, the diameter range of the test specimens is applicable to most commercially available ropes and cables, and the material of the test specimens is not limited; (4) The test can be set according to different test requirements, making the applicability of this device more extensive; In summary, the measuring device for measuring the flexibility of ropes of the present invention tests the bending flexibility of ropes in two ways. Firstly, the pressure plate and clamping plane clamp the rope to be tested (a), compressing it and causing deformation. Sensors can detect the rope's stiffness, i.e., its flexibility, during this process. Secondly, a torque measuring device for the rope to be tested (a) is established by combining a semi-circular plate and a lever device. After one end of the rope to be tested (a) is clamped by the pressure plate and clamping plane, the ease with which the other end rotates along the semi-circular trajectory groove, i.e., its bending performance, is measured. This device is simple to operate, has excellent repeatability and reproducibility, and has broad application prospects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the measuring device for measuring the flexibility of ropes and cables according to the present invention. Figure 2 yes Figure 1 Schematic diagram of the middle rope clamping device; Figure 3 yes Figure 1 A schematic diagram of the assembled structure of the bending angle protractor and lever device; Figure 4 yes Figure 3 The left view; Figure 5 yes Figure 1 Top view; Figure 6 yes Figure 1 Front view of the leveling device after installation.

[0018] List of identifiers in attached diagrams: a. Cable; 1. Device frame; 22. Rectangular structural frame; 23. Crossbeam; 24. Rectangular structural metal base plate; 26. Rib plate; 2. Cable clamping device; 6. Motor; 7. Push rod; 8. Connecting unit; 9. Sensor; 10. Pressure plate; 11. Clamping plane; 12. Display screen; 3. Bending angle protractor; 27. Semi-circular plate; 28. Semi-circular trajectory motion groove; 4. Lever device; 13. Lever; 14. Tongue; 15. Fixing screw; 16. Nut; 17. Washer; 18. Elastic pad; 5. Leveling device; 19. Leveling bolt; 20. Leveling nut; 21. Spring; 25. Threaded hole; 29. ​​Circular bubble level. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] like Figure 1-6 As shown, the measuring device for measuring the flexibility of ropes and cables of the present invention includes a device frame 1, a rope clamping device 2, a bending angle protractor 3, a lever device 4, and a leveling device 5. The leveling device 5 is installed at the bottom of the device frame 1, forming an L-shape with the device frame 1. The rope clamping device 2 includes a motor 6, a push rod 7, a connecting unit 8, a sensor 9, a pressure plate 10, a clamping plane 11, and a display screen 12. The upper end of the motor 6 is fixed to the device frame 1, and the lower end is connected to the upper end of the push rod 7. The upper end of the connecting unit 8 is connected to the lower end of the push rod 7, and the lower end is connected to the sensor 9. The sensor 9 is installed on the disc-shaped pressure plate 10. The clamping plane 11 is fixed to the device frame 1 and located directly below the pressure plate 10. Both the pressure plate 10 and the clamping plane 11 are parallel to the horizontal plane. The bending angle protractor 3 is perpendicular to the horizontal plane, installed on the device frame 1, and located below the clamping plane 11. The angle measuring protractor 3 includes a semi-circular plate 27 with a semi-circular trajectory movement groove 28 around its periphery. The lever device 4 is installed in the semi-circular trajectory movement groove 28 and can move within it. The display screen 12 is mounted on the device frame 1 and electrically connected to the sensor 9 to receive data read by the sensor 9. One end of the cable a to be tested is placed between the pressure plate 10 and the clamping plane 11, and the motor 6 is started. The motor shaft drives the push rod 7 to move up and down linearly, which in turn drives the connecting unit 8, the sensor 9, and the pressure plate 10 to move up and down linearly, thereby controlling the distance between the pressure plate 10 and the clamping plane 11. This allows the cable a to be tested to be clamped and fixed or released. The lever device 4 is connected to the other end of the cable a to be tested. The center of the semi-circular plate 27 coincides with the farthest end of the cable a to be tested that is clamped between the pressure plate 10 and the clamping plane 11.

[0021] The device frame 1 includes a rectangular structural frame 22, crossbeams 23, a rectangular structural metal base plate 24, and ribs 26. The rectangular structural frame 22 is the main body of the device frame 1. There are two crossbeams 23, which are fixed to the rectangular structural frame 22 from top to bottom. The upper crossbeam 23 is used to fix the upper end of the motor 6 of the cable clamping device 2. The display screen 12 is also detachably connected to the upper crossbeam 23 and located on one side of the motor 6. The lower crossbeam 23 is used to fix the upper end face of the bending angle protractor 3. The rectangular structural metal base plate 24 is a support plate of the device frame 1 and is used to support the entire measuring device for measuring the flexibility of the cable. The leveling device 5 is detachably installed at the four corners of the rectangular structural metal base plate 24. The rectangular structural frame 22 and the rectangular structural metal base plate 24 are perpendicular to each other, and the right angle formed is fixed by the four ribs 26. The two crossbeams 23 and the rectangular structural metal base plate 24 are parallel to each other and parallel to the horizontal plane.

[0022] The bending angle protractor 3 is a semi-circular protractor with a scale from 0° to 180°, and the angles are distributed from small to large from the end of the cable a being clamped away from the end of the cable a being clamped. like Figure 4 As shown, the lever device 4 includes a lever 13, a tongue 14, a fixing screw 15, a nut 16, a washer 17, and an elastic pad 18. The tongue 14 is fixedly connected to the lever 13 and is detachably connected to the semi-circular trajectory movement groove 28 on the semi-circular plate 27 via the fixing screw 15 and the nut 16. The washer 17 and the elastic pad 18 are located on both sides of the semi-circular plate 27 and are respectively installed between the lever 13 and the semi-circular plate 27, and between the semi-circular plate 27 and the nut 16. The tongue 14 is connected to the other end of the cable a to be tested. After installation, the lever device 4 can move along the semi-circular trajectory movement groove 28 of the semi-circular plate 27.

[0023] like Figure 6 As shown, the leveling device 5 includes leveling bolts 19, leveling nuts 20, springs 21, and circular bubble level 29. The four corners of the rectangular metal base plate 24 are provided with threaded holes 25 that match the external threads of the leveling bolts 19. The leveling bolts 19, leveling nuts 20, and springs 21 form a group, totaling four groups, which are respectively installed in the four threaded holes 25 of the rectangular metal base plate 24. The circular bubble level 29 is installed on the upper surface of the rectangular metal base plate 24. By observing the circular bubble level 29, each group of leveling nuts 20 is adjusted to ensure that the upper surface of the rectangular metal base plate 24 is always in a horizontal position.

[0024] The sensor 9 is a pressure sensor that can monitor in real time the displacement value of the cable to be tested a clamped between the pressure plate 10 and the clamping plane 11 from the start of compression until it is fully compressed. It can also measure the pressure of the clamped cable in real time and calculate the distance from the pressure data change position to the pressure plate 10, which is the diameter of the clamped cable to be measured.

[0025] The contact surfaces of the pressure plate 10 and the clamping plane 11 are both made of materials with high flatness, high rigidity and wear resistance. The lower surface of the end of the clamping plane 11 is rounded (to prevent the cable a to be tested from bending due to the thickness of the pressure plate 10).

[0026] The diameter of the semi-circular trajectory movement groove 28 of the bending angle protractor 3 is greater than or equal to the length of the extended portion of the cable a to be tested, and the device frame (1) is a metal frame.

[0027] The beneficial effects of this invention are as follows: (1) Effectively realized the testing of flexibility of special, three-dimensional, and slender textiles such as ropes and cables; (2) The experimental results are concise and clear, all data are displayed by sensors, and the data results are accurate and efficient to read. (3) The test range is wide, the diameter range of the test specimens is applicable to most commercially available ropes and cables, and the material of the test specimens is not limited. (4) The test can be set according to different test requirements, making the applicability of this device more extensive; In summary, the measuring device for measuring the flexibility of ropes of the present invention tests the bending flexibility of ropes in two ways. Firstly, the pressure plate 10 and clamping plane 11 clamp the rope to be tested (a), compressing it and causing deformation. Sensor 9 detects the rope's stiffness, i.e., its flexibility, during this process. Secondly, the combination of the semi-circular plate 27 and the lever device 4 forms a torque measuring device for the rope to be tested (a). After one end of the rope to be tested (a) is clamped by the pressure plate 10 and clamping plane 11, the ease with which the other end rotates along the semi-circular trajectory groove 28, i.e., its bending performance, is measured. More specifically, this device can record and display the clamping force between the pressure plate 10 and the clamping plane 11, as well as the distance between them, through sensors and a display screen. This distance is then compared with the diameter of the cable a to be tested to determine the radial compactness of the cable a, thereby measuring its compressibility. The cable to be tested, 'a', extends outward from the cable clamping device and is fixed by the tongue 14 of the lever device, maintaining a naturally drooping state. The angle between the line connecting the outermost end of the cable to be tested and the tail end of the extended portion and the horizon can be used to measure the axial deformation of the cable to be tested in its natural state. This angle is read using a bending angle protractor. The lever and tongue move along the semi-circular track groove 28, moving from top to bottom to pull the tail end of the cable to be tested. After being pulled by the tongue through a certain angle, the cable to be tested returns to its natural hanging state. By recording the maximum value of the angle after the pull and the maximum value of the lever's pulling force, its recovery ability reflected by its compressive strength under external force can be measured. This invention features high testing accuracy, stable and reliable performance, repeatable operation, simple operation, and wide applicability. It can be used for testing and inspecting the flexibility and compressive strength of cables.

[0028] It should be noted that the above content merely illustrates the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, various improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A measuring device for measuring the flexibility of a rope, comprising a device frame (1), a rope clamping device (2), a bending angle protractor (3), a lever device (4), and a leveling device (5), characterized in that, After the leveling device (5) is installed at the bottom of the device frame (1), it forms an L-shape with the device frame (1). The cable clamping device (2) includes a motor (6), a push rod (7), a connecting unit (8), a sensor (9), a pressure plate (10), a clamping plane (11), and a display screen (12). The upper end of the motor (6) is fixed to the device frame (1), and the lower end is connected to the upper end of the push rod (7). The upper end of the connecting unit (8) is connected to the lower end of the push rod (7), and the lower end is connected to the sensor. Sensor (9), the sensor (9) is mounted on the disc-shaped pressure plate (10), the clamping plane (11) is fixed on the device frame (1) and located directly below the pressure plate (10), the pressure plate (10) and the clamping plane (11) are both parallel to the horizontal plane, the bending angle protractor (3) is perpendicular to the horizontal plane, mounted on the device frame (1) and located below the clamping plane (11), the bending angle protractor (3) includes a semi-circular plate (27), the semi-circular plate (27) is perpendicular to the horizontal plane, the bending angle protractor (3) includes a semi-circular plate (27), the semi-circular plate (27) is perpendicular to the horizontal plane, the clamping plane (11) is located directly below the clamping plane (11), the bending angle protractor (3) includes a semi-circular plate (27), the semi-circular plate (27) is perpendicular to the horizontal plane, the clamping plane (11) is fixed on the device frame (1) and located directly below the clamping plane (10), the clamping plane (11) is located directly below the clamping plane (11), the bending angle protractor (3) includes a semi-circular plate (27), the semi-circular plate (27) is perpendicular to the horizontal plane, the semi-circular plate (27) is perpendicular to the horizontal plane, the clamping plane (11) is fixed on the device frame (1) and located directly below the clamping plane (11), the clamping plane (10 ...1) includes a semi-circular plate (27), the semi-circular plate (27) is perpendicular to the horizontal plane (10), the clamping plane (27) is perpendicular to the A semi-circular trajectory motion groove (28) is provided around the periphery of the circular flat plate (27). The lever device (4) is installed in the semi-circular trajectory motion groove (28) and can move in the semi-circular trajectory motion groove (28). The display screen (12) is installed on the device frame (1) and electrically connected to the sensor (9) to receive the data read by the sensor (9). One end of the rope to be tested is placed between the pressure plate (10) and the clamping plane (11). The motor (6) is started. The shaft drives the push rod (7) to move up and down in a straight line, which in turn drives the connecting unit (8), sensor (9), and pressure plate (10) to move up and down in a straight line, thereby controlling the distance between the pressure plate (10) and the clamping plane (11), thereby clamping or releasing one end of the rope to be tested. The lever device (4) connects to the other end of the rope to be tested. The center of the semi-circular plate (27) coincides with the farthest end of the rope to be tested that is clamped between the pressure plate (10) and the clamping plane (11).

2. The measuring device for measuring the flexibility of ropes and cables according to claim 1, characterized in that, The device frame (1) includes a rectangular structural frame (22), crossbeams (23), a rectangular structural metal base plate (24), and ribs (26). The rectangular structural frame (22) is the main body of the device frame (1). There are two crossbeams (23), which are fixed to the rectangular structural frame (22) from top to bottom. The upper crossbeam (23) is used to fix the upper end of the motor (6) of the cable clamping device (2). The display screen (12) is detachably connected to the upper crossbeam (23) and located on one side of the motor (6). The lower crossbeam (23) is used to fix the upper end of the motor (6) of the cable clamping device (2). The upper surface of the bending angle protractor (3) is fixedly connected. The rectangular metal base plate (24) is a support plate of the device frame (1) and is used to support the entire measuring device for measuring the flexibility of the rope. The leveling device (5) is detachably installed at the four corners of the rectangular metal base plate (24). The rectangular frame (22) and the rectangular metal base plate (24) are perpendicular to each other. The right angle formed is fixed by four ribs (26). The two crossbeams (23) and the rectangular metal base plate (24) are parallel to each other and parallel to the horizontal plane.

3. The measuring device for measuring the flexibility of ropes and cables according to claim 2, characterized in that, The bending angle protractor (3) is a semi-circular protractor with a scale from 0° to 180°, and the angle is distributed from small to large from the end of the rope to be tested that is far away from the clamped end to the end of the rope to be tested that is close to the clamped end.

4. The measuring device for measuring the flexibility of ropes and cables according to claim 3, characterized in that, The lever device (4) includes a lever (13), a tongue (14), a fixing screw (15), a nut (16), a washer (17), and an elastic pad (18). The tongue (14) is fixedly connected to the lever (13) and then detachably connected to the semi-circular track movement groove (28) on the semi-circular plate (27) through the fixing screw (15) and the nut (16). The washer (17) and the elastic pad (18) are located on both sides of the semi-circular plate (27). The elastic pad (18) is installed between the lever (13) and the semi-circular plate (27). The washer (17) is installed between the semi-circular plate (27) and the nut (16). The tongue (14) is connected to the other end of the rope to be tested. After installation, the lever device (4) can move along the semi-circular track movement groove (28) of the semi-circular plate (27).

5. The measuring device for measuring the flexibility of ropes and cables according to claim 4, characterized in that, The leveling device (5) includes a leveling bolt (19), a leveling nut (20), a spring (21), and a circular bubble level (29). The four corners of the rectangular metal base plate (24) are provided with threaded holes (25) that are compatible with the external threads of the leveling bolt (19). The leveling bolt (19), the leveling nut (20), and the spring (21) are a set, and there are four sets in total. They are installed in the four threaded holes (25) of the rectangular metal base plate (24) respectively. The circular bubble level (29) is installed on the upper surface of the rectangular metal base plate (24). Each set of leveling nuts (20) is adjusted by observing the circular bubble level (29) so that the upper surface of the rectangular metal base plate (24) is always in a horizontal position.

6. The measuring device for measuring the flexibility of ropes and cables according to claim 5, characterized in that, The diameter of the semi-circular trajectory movement groove (28) of the bending angle protractor (3) is greater than or equal to the length of the extended portion of the cable to be tested, and the device frame (1) is a metal frame.

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