Steel wire rope tension bending and torsion fatigue test method and apparatus considering vibration and damage characteristics

Abstract

The application belongs to the technical field of fatigue test, and provides a steel wire rope pull bending and torsion fatigue test method and equipment considering vibration and damage characteristics, which realizes simulation of vibration state on the basis of not increasing the vibrator by continuously changing the sliding platform in the preset range, determines the adjustment strategy of setting the running speed of the sliding platform according to the ratio of the diameter of the pulley to the diameter of the steel wire rope, realizes simulation of the external wear damage characteristics of the steel wire rope on the basis of reducing the frequency of replacing the pulley, can simulate the effect of the vibration affecting the extrusion contact state between the steel wire rope and the pulley in the mine hoisting process, reduces the error between the fatigue test result and the actual situation, and guarantees the promotion of the test equipment.

Description

Technical Field

[0001] This invention belongs to the field of fatigue testing technology, and in particular relates to a method and equipment for tensile, bending and torsional fatigue testing of steel wire ropes that takes into account vibration and damage characteristics. Background Technology

[0002] In the mine hoisting cycle, the wire rope connects to the container and moves around multiple pulleys, often in a state of bending deformation. Since the end of the wire rope connected to the container is restricted from torsion, a torque is generated in response to tensile stress and oscillates with the hoisting process. The use of a horizontal wire rope fatigue testing machine cannot meet the requirements of comprehensive fatigue testing of wire rope under the actual working conditions of mine hoisting, and ignores the influence of torsion on the fatigue damage of the wire rope.

[0003] Torque generators and sensors can be used to simulate the effect of torsion on the fatigue damage of wire ropes; however, the vibration state and service life damage characteristics of wire ropes in mine hoisting cycles cannot be simulated on existing testing machines, resulting in a large error between fatigue test results and actual conditions. Simulating vibration state by adding vibration mechanisms would increase the structural complexity of the testing machine and the difficulty of test operation, which is not conducive to the widespread use of the testing machine. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a method and equipment for conducting tensile, bending, and torsional fatigue tests on wire ropes that consider vibration and damage characteristics. This invention simulates vibration states without adding a vibrator. Based on the ratio of pulley diameter to wire rope diameter, it determines an adjustment strategy for setting the running speed of the sliding platform. By reducing the frequency of pulley replacement, it simulates the external wear and damage characteristics of the wire rope, reducing the error between fatigue test results and actual conditions, and ensuring the widespread application of the testing equipment.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a method for conducting tensile-bending-torsional fatigue tests on steel wire ropes that takes into account vibration and damage characteristics, comprising: Obtain the set operating speed of the sliding platform, the service time of the wire rope, and the ratio of the pulley to the wire rope diameter; Based on the set operating speed of the sliding platform, a preset range is determined; wherein the difference between the maximum and minimum speeds within the preset range and the set operating speed of the sliding platform is less than the set difference. Determine whether to replace the pulley based on the service life of the wire rope; if the pulley is not replaced, determine the adjustment strategy for the running speed of the sliding platform based on the diameter ratio of the pulley to the wire rope, and simulate the wear and tear of the wire rope. According to the set operating speed adjustment strategy, the sliding platform is controlled to continuously change speed and reciprocate within a preset range to carry out tensile, bending and torsional fatigue tests.

[0006] Furthermore, by controlling the frequency of speed changes within the reciprocating motion cycle of the sliding platform, the increased vibration caused by the increase in speed can be addressed.

[0007] Furthermore, a half-cycle is defined as the sliding platform moving from one end of the frame to the other. When the set operating speed of the sliding platform does not exceed the first set speed, the sliding platform changes speed only once within the preset range in each half-cycle. When the set operating speed of the sliding platform is greater than the first set speed but not greater than the second set speed, the sliding platform changes speed only twice within the preset range in each half-cycle. When the set operating speed of the sliding platform is greater than the second set speed but not greater than the third set speed, the sliding platform changes speed only four times within the preset range.

[0008] Furthermore, if the wire rope is used for no more than the preset time, the pulley is not replaced, and the wear is simulated by increasing or decreasing the speed of the sliding platform; if the wire rope is used for more than the preset time, different diameter ratios are simulated by replacing the pulley with different diameters.

[0009] Furthermore, without replacing the pulley, if the pulley-to-wire rope diameter ratio is greater than the preset diameter ratio, the sliding platform speed remains unchanged; if the pulley-to-wire rope diameter ratio is not greater than the preset diameter ratio, the wire rope is severely worn, and in this case, the sliding platform speed should be increased. Furthermore, depending on the object being lifted, a pretension is applied. The greater the weight of the object being lifted by the wire rope, the greater the pretension; conversely, the smaller the weight of the object being lifted by the wire rope, the smaller the pretension. During acceleration, the tension is increased based on the pretension, and the greater the acceleration, the greater the increase in tension. During deceleration, the tension is decreased based on the pretension, and the greater the deceleration, the greater the decrease in tension. During uniform motion, the tension is adjusted back to the pretension level.

[0010] Secondly, the present invention also provides a wire rope tension-bending-torsion fatigue testing system that takes into account vibration and damage characteristics, comprising: The data acquisition module is configured to: acquire the set running speed of the sliding platform, the usage time of the wire rope, and the ratio of the pulley to the wire rope diameter; The speed range determination module is configured to: determine a preset range based on the set operating speed of the sliding platform; wherein the difference between the maximum and minimum speeds within the preset range and the set operating speed of the sliding platform is less than the set difference. The operating speed adjustment module is configured to: determine whether to replace the pulley based on the service time of the wire rope; when the pulley is not replaced, determine the adjustment strategy for the operating speed of the sliding platform based on the diameter ratio of the pulley to the wire rope, simulating the wear condition of the wire rope; The test module is configured to control the sliding platform to continuously change speed and reciprocate within a preset range according to the set operating speed adjustment strategy, and to conduct tensile, bending and torsional fatigue tests.

[0011] Thirdly, the present invention also provides a wire rope tension-bending-torsion fatigue testing device that takes into account vibration and damage characteristics, including a tension regulator and a torque generator respectively disposed at both ends of a frame, and a sliding platform disposed on the frame; the two ends of the wire rope to be tested are respectively connected to the tension regulator and the torque generator, and the middle part passes around the pulley group on the torque generator; the sliding platform is connected to a motor via a synchronous belt, and the motor is connected to a controller; The controller is configured to: determine a preset range based on the set operating speed of the sliding platform, and control the sliding platform to continuously change speed and reciprocate within the preset range; wherein the difference between the maximum and minimum speeds within the preset range and the set operating speed of the sliding platform is less than a set difference; determine whether to replace the pulley based on the service life of the wire rope; when the pulley is not replaced, determine an adjustment strategy for the set operating speed of the sliding platform based on the diameter ratio of the pulley to the wire rope to simulate the wear condition of the wire rope.

[0012] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the wire rope tension-bending-torsion fatigue test method considering vibration and damage characteristics as described in the first aspect.

[0013] Fifthly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to implement the steps of the wire rope tension-bending-torsion fatigue test method considering vibration and damage characteristics as described in the first aspect.

[0014] In a sixth aspect, the present invention also provides a computer program product comprising a computer program that, when executed by a processor, implements the steps of the wire rope tension-bending-torsional fatigue test method considering vibration and damage characteristics as described in the first aspect.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention simulates vibration states by controlling the sliding platform to continuously change within a preset range without adding a vibrator. Based on the diameter ratio of the pulley to the wire rope, it determines the adjustment strategy for the set operating speed of the sliding platform, and simulates the external wear and damage characteristics of the wire rope while reducing the frequency of pulley replacement. It can simulate the effect of vibration on the squeezing contact state between the wire rope and the pulley during mine hoisting, reduce the error between fatigue test results and actual conditions, and ensure the promotion of the test equipment. Attached Figure Description

[0016] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0017] Figure 1 This is a schematic diagram of the experimental equipment structure according to Embodiment 1 of the present invention; Figure 2 This is a top view of the test equipment in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the controller connection in Embodiment 1 of the present invention; The components include: 1. Frame; 2. Guide rail; 3. Proximity switch; 4. Sliding platform; 5. Pulley block; 6. Motor; 7. Guide wheel; 8. Synchronous belt; 9. Rope loop; 10. Tension sensor; 11. Tension regulator; 12. Torque sensor; 13. Torque generator; 14. Anchor; 15. Controller. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] In mine hoisting cycles, wire ropes connect to containers and move around multiple pulleys, frequently undergoing bending and deformation. Because the end of the wire rope connected to the container is restricted from twisting, a torque responding to tensile stress is generated and oscillates during the hoisting process; that is, the rope end shifts between a tightly twisted and loosely twisted state. From a fatigue perspective, the range of this tension variation, especially the range of torsional variation, is crucial. Currently, horizontal wire rope fatigue testing machines are used, where the wire rope passes around the drive and driven pulleys to form a closed loop. A servo frequency converter motor drives the drive pulley to reciprocate via a proximity switch signal, enabling simple tensile and bending fatigue tests on the wire rope. However, this method cannot meet the comprehensive tensile, bending, and torsional fatigue testing requirements of wire ropes under actual mine hoisting conditions, especially neglecting the impact of torsional forces on wire rope fatigue damage, and failing to provide real-time observation and assessment of the wire rope's mechanical state and fatigue performance.

[0021] As described in the background section, the effect of torsion on the fatigue damage of wire ropes can be simulated using torque generators and sensors on some other fatigue testing machines. However, the vibration state and service life damage characteristics of wire ropes in mine hoisting cycles cannot be simulated on existing testing machines, resulting in a large error between the fatigue test results and the actual situation. Simulating the vibration state by adding vibration mechanisms would increase the structural complexity of the testing machine and the difficulty of test operation, which is not conducive to the widespread use of the testing machine.

[0022] To solve at least one of the above problems, such as Figures 1-3 As shown, one embodiment of the present invention provides a wire rope tension-bending-torsion fatigue testing device that considers vibration and damage characteristics. It can test the influence of tension and torsion on the fatigue life of wire ropes and determine the fatigue process of wire ropes based on the collected data. The testing device includes a frame 1, a guide rail 2, a proximity switch 3, a sliding platform 4, a pulley block 5, a motor 6, a guide wheel 7, a synchronous belt 8, a rope loop 9, a tension sensor 10, a tension regulator 11, a torque sensor 12, a torque generator 13, an anchor 14, and a controller 15, etc.

[0023] Specifically, the frame 1 can adopt a metal frame or similar structure; the guide rail 2 is arranged along the length of the frame 1; there are two proximity switches 3, respectively located at both ends of the frame 1; the sliding platform 4 is provided with a slider or similar structure that is slidably connected to the guide rail 2; the pulley group 5 includes multiple pulleys, which are staggered on the sliding platform 4, and the pulleys have rope grooves; the motor 6 is located at one end of the frame 1 and connected to the sliding platform 4 via a synchronous belt 8, and the motor 6 can drive the sliding platform 4 to reciprocate through the synchronous belt 8; the guide wheel 7 is located at one end of the frame 1, and the tension adjuster 11 is located at the lower part of the frame 1 near the end of the guide wheel 7; the tension sensor 10 is located at the output end of the tension adjuster 11. Force sensor 10 is connected to one end of the steel wire rope to be tested via rope loop 9. The rope loop 9 can be a wedge-shaped rope loop, and the tension sensor 10 can be an S-shaped tension sensor. Torque generator 13 is located at the end of the frame 1 away from the tension regulator 11. Torque sensor 12 is provided between the tension regulator 11 and the frame 1. Torque sensor 12 can be a static ring torque sensor. The steel wire rope to be tested is connected to the tension regulator 11 via anchor 14. The anchor 14 can be a prestressed anchor. Specifically, one end of the steel wire rope to be tested is connected to the rope loop 9 via guide wheel 7. The rope loop 9 is connected to the tension regulator 11 via tension sensor 10. The other end of the steel wire rope to be tested passes through torque sensor 12 and is connected to torque generator 13, and the rope head is fixed by anchor 14.

[0024] Optionally, the tension regulator can be configured as a servo electric cylinder. One end of the steel wire rope to be tested is wound around the guide wheel 7 and then fixedly connected to the piston rod of the servo electric cylinder via a rope loop 9. A counter is also provided on the frame 1, and the counter is communicatively connected to the controller 15. The motor 6 can be configured as a servo frequency converter motor, and the motor 6 is equipped with a synchronous pulley. The synchronous pulley is equipped with a synchronous belt 8 and connected to the sliding platform 4. The proximity switch 3, motor 6, tension sensor 10, torque sensor 12, and torque generator 13 are respectively connected to the controller 15 with a display screen. The tension of the steel wire rope is set by the controller 15; the torsion angle of the steel wire rope is applied by the torque generator 13. The data from the tension sensor 10, the torque sensor 12, and the piston rod contraction data reflect the fatigue evolution characteristics during the bending fatigue process of the steel wire rope.

[0025] The tension of the wire rope in this invention can be adjusted as required, enabling fatigue testing of the wire rope under constant and variable tension. The torsion angle of the wire rope can be adjusted via a torque connecting ring, achieving bending fatigue testing of the wire rope under different torsional conditions. The wire rope fatigue testing machine is characterized by simple installation and convenient operation. The bending fatigue evolution characteristics of the wire rope can be reflected by the wire rope's mechanical and displacement data.

[0026] One embodiment of the present invention also provides a method for conducting a wire rope tension-bending-torsional fatigue test considering vibration and damage characteristics. First, the test equipment is started, and the tension regulator 11 is extended via the controller 15. Next, the wire rope is passed through the pulley block 5 of the sliding platform 4, and the ends of the wire rope are secured using anchors 14 and rope loops 9. Finally, the tension regulator is tightened until the tension of the wire rope reaches and stabilizes at a preset value. Parameters such as the sliding platform's running speed, number of runs, pre-tension, and torque can be set via the control panel. The motor 6 is connected to the sliding platform 4 via a synchronous belt 8. The start and stop of the motor 6 are controlled by a signal from the proximity switch 3. Whenever the sliding platform 4 reaches the end of its stroke, the reverse signal of the proximity switch 3 is activated, thereby controlling the motor 6 to reverse, and the sliding platform 4 subsequently runs in the opposite direction along the guide rail 2. The controller 15 drives the piston rod of the tension regulator 11 to extend and retract based on feedback values ​​collected from the tension sensor 10, thereby automatically adjusting the position of the rope ends to maintain constant wire rope tension.

[0027] During mine hoisting operations, vibration affects the compression contact state between the wire rope and pulley, thus impacting the wire rope's friction and wear performance and fatigue life. Therefore, this invention, by controlling the rotational speed of the motor 6 as it drives the sliding platform 4 via the synchronous belt 8, continuously varies the operating speed of the sliding platform 4 within a preset range. This simulates the vibration state of the wire rope by adjusting its operating speed, simultaneously testing the impact of speed and vibration on the wire rope's damage characteristics. The difference between the maximum and minimum speed values ​​within the preset range and the set operating speed of the sliding platform 4 is less than the set difference; for example, if the set operating speed of the sliding platform 4 is 1.2 m / s, the preset range is 1.1 m / s - 1.3 m / s (the set difference is 0.1 m / s). By continuously varying the sliding platform 4 within the preset range, the vibration state is simulated without adding a vibrator, thereby simulating the effect of vibration on the compression contact state between the wire rope and pulley during mine hoisting and reducing the error between fatigue test results and actual conditions.

[0028] During mine hoisting operations, the faster the wire rope travels, the greater the vibration typically occurs. Therefore, the increased vibration caused by increased speed is addressed by controlling the frequency of speed changes within the reciprocating motion cycle of the sliding platform 4. For example, a half-cycle is defined as the distance the sliding platform 4 travels from one end of the frame to the other (the distance between the two proximity switches 3). When the set speed of the sliding platform 4 does not exceed the first set speed (1.2 m / s), within each half-cycle, the sliding platform 4 only changes speed once within a preset range (increasing to the maximum value of the preset range based on the set speed, then decreasing to the minimum value of the preset range). When the set speed of the sliding platform 4 is greater than the first set speed (1.2 m / s) but not greater than the second set speed (2 m / s), the lateral vibration intensifies. At this time, within each half-cycle... The sliding platform 4 was controlled to change speed twice within a preset range (increasing to the maximum value of the preset range, then decreasing to the minimum value, and then increasing back to the preset range from the minimum value) to address the simulation problem of increased vibration. When the set operating speed of the sliding platform 4 was greater than the second set speed (2 m / s) but not greater than the third set speed (5 m / s or 7 m / s), the wire rope vibration exhibited a certain nonlinear pattern. In this case, to simulate the nonlinear vibration pattern, the sliding platform 4 was controlled to change speed four times within the preset range every half cycle. By controlling the frequency of speed change within the reciprocating motion cycle of the sliding platform 4, flexible simulation of the wire rope vibration state was achieved, further improving the experimental accuracy.

[0029] In mine hoisting operations, the diameter ratio of pulleys to wire ropes is a crucial factor affecting the damage characteristics of wire ropes and their service life. The impact of changing pulley diameters can be simulated. However, frequent pulley replacement is inconvenient and impractical in actual testing. Therefore, during testing, if the wire rope is new (and the testing or usage time does not exceed the preset duration), the internal fatigue fracture caused by the diameter ratio is not considered. In this case, only the damage characteristics caused by wear between the pulley and the wire rope are considered, without replacing the pulley. The damage is mitigated by increasing or decreasing the speed of the sliding platform. The speed of sliding platform 4 is used to simulate wear. For example, when the diameter ratio of the pulley to the wire rope is greater than the preset ratio, the wire rope experiences less wear, and the speed of sliding platform 4 remains constant. However, when the diameter ratio is not greater than the preset ratio (the smaller the ratio, the more severe the surface wear of the wire rope), the wire rope experiences severe wear. In this case, the speed of sliding platform 4 is increased (e.g., from 1.2 m / s to 1.4 m / s). This increases frictional heat and wear, simulating surface damage to the wire rope and avoiding the need for frequent pulley replacements. For older wire ropes (those tested or used for longer than the preset time), issues such as internal fatigue fracture caused by the diameter ratio need to be considered. In this case, different pulley diameters are used to simulate different diameter ratios, thus obtaining test results that reflect internal fatigue fracture problems in the wire rope.

[0030] In other embodiments, since the elastic / plastic elongation of the wire rope occurs after a period of use, which is an important indicator of the wire rope's performance, this invention can track the change in wire rope elongation during fatigue in real time through the extension and retraction of the electric cylinder. This invention can achieve constant tension adjustment, thereby simulating the evolution of fatigue characteristics such as elongation, torque, and wire breakage of the wire rope under different loads (such as hoisting coal and gangue, transporting materials and personnel) during actual mine hoisting processes. This invention can achieve variable tension adjustment, constructing and inputting mechanical curves to simulate the stress state of the wire rope during acceleration, stabilization, and deceleration, thus simulating the evolution of fatigue characteristics such as elongation, torque, and wire breakage under variable tension conditions. During service, the wire rope repeatedly undergoes tight and loose twisting; this torsional fatigue has a significant impact on the wire rope's performance. This invention, through its open-loop design test bench, can track the change in wire rope torque during fatigue. Furthermore, it can simulate the impact of the additional torsional load transmitted to the new rope during manual replacement of mine hoisting wire ropes on fatigue characteristics such as elongation, torque, and wire breakage.

[0031] In some other embodiments, when adjusting the tension, a pretension is applied based on the different objects being lifted; for example, the greater the weight of the object being lifted by the wire rope, the greater the pretension, and vice versa. During speed changes, the tension is adaptively adjusted based on the pretension; specifically, during acceleration, the tension is increased based on the pretension, with a greater increase in tension as the acceleration value increases; during deceleration, the tension is decreased based on the pretension, with a greater decrease in tension as the deceleration value increases; and during uniform motion, the tension is adjusted back to the pretension level. This adaptive adjustment of tension and speed improves the realism of the simulated real-world scenario and enhances the experimental results.

[0032] Example 1: This embodiment provides a wire rope tension, bending and torsional fatigue testing device that takes into account vibration and damage characteristics. One end of the wire rope to be tested passes around the guide wheel 7 and is connected to the rope loop 9. The rope loop 9 is connected to the tension regulator 11 through the tension sensor 10. The other end of the wire rope passes through the torque sensor 12 and is connected to the torque generator 13, and is fixed by the rope head through the anchor 14.

[0033] One of the experimental procedures or principles in this embodiment is as follows: The wire rope is twisted at 90° intervals at the rope end, while the rope end is fixed to prevent untwisting and slippage during fatigue. The torque and tension of the wire rope can be measured by torque sensor 12 and tension sensor 10, respectively. The tension and torsion sensors are calibrated according to the standard calibration procedure provided by the manufacturer. The torque sensor 12 has a range of -300-300 N·m and an accuracy of 0.1%, while the tension sensor 10 has a range of 0-5 T and a measurement accuracy of 0.05%. The controller 15 can realize the functions of tightening and loosening the wire rope, starting and emergency stopping, and manual / automatic switching. The controller 15 can be configured with a panel for parameter visualization and data acquisition. The built-in acquisition module converts the sensor current signal into a digital signal and stores it. Then, it uses the Profinet industrial communication protocol based on Ethernet to synchronously transmit the digital signal to the computer. The wire rope running speed (fatigue cycle), maximum number of cycles, and wire rope tension can be directly adjusted through the panel. The number of cycles, running speed, wire rope torque, and tension are displayed and acquired in real time.

[0034] First, the test equipment is started, and the tension regulator 11 is extended by the controller 15. Next, the wire rope is passed through the pulley block 5 of the sliding platform 4, and the ends of the wire rope are fixed using anchors 14 and rope loops 9. Finally, the tension regulator is tightened until the tension of the wire rope reaches and stabilizes at a preset value. The sliding platform's running speed, number of runs, pre-tension, torque, and other parameters can be set via the control panel. The motor 6 is connected to the sliding platform 4 via a synchronous belt 8. The start and stop of the motor 6 are controlled by the signal from the proximity switch 3. Whenever the sliding platform 4 reaches the end of its stroke, the reverse signal of the proximity switch 3 is activated, thereby controlling the motor 6 to reverse, and the sliding platform 4 then runs in the opposite direction along the guide rail 2. The controller 15 drives the piston rod of the tension regulator 11 to extend and retract based on the feedback value collected from the tension sensor 10, thereby automatically adjusting the position of the rope end to maintain a constant wire rope tension. Furthermore, the test equipment in this embodiment can be used to perform bending fatigue damage tests on the wire rope under variable tension.

[0035] The fatigue process of the wire rope is completely symmetrical on both sides of the travel. One forward and reverse rotation of the servo motor is considered one cycle of the entire test system. N t , N t The data can be read from the control panel. Each 90° bend of the wire rope around the pulley is recorded as one instance of bending fatigue. N b One cycle N t The bending fatigue number of different sections of the wire rope varies, and therefore the bending fatigue number of different sections can be calculated based on the number of cycles in the testing system. Table 1 lists the lengths and cycle periods of different sections of the wire rope. N t Number of bending fatigue cycles within the body.

[0036] Table 1. Wire rope length and corresponding bending fatigue cycles in different sections

[0037] Example 2: This embodiment provides a wire rope tension-bending-torsion fatigue testing system that considers vibration and damage characteristics, including: The data acquisition module is configured to: acquire the set running speed of the sliding platform, the usage time of the wire rope, and the ratio of the pulley to the wire rope diameter; The speed range determination module is configured to: determine a preset range based on the set operating speed of the sliding platform; wherein the difference between the maximum and minimum speeds within the preset range and the set operating speed of the sliding platform is less than the set difference. The operating speed adjustment module is configured to: determine whether to replace the pulley based on the service time of the wire rope; when the pulley is not replaced, determine the adjustment strategy for the operating speed of the sliding platform based on the diameter ratio of the pulley to the wire rope, simulating the wear condition of the wire rope; The test module is configured to control the sliding platform to continuously change speed and reciprocate within a preset range according to the set operating speed adjustment strategy, and to conduct tensile, bending and torsional fatigue tests.

[0038] The working method of the system is the same as the wire rope tension-bending-torsion fatigue test method considering vibration and damage characteristics in the embodiments of the present invention, and will not be repeated here.

[0039] Example 3: This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the wire rope tension-bending-torsion fatigue test method considering vibration and damage characteristics described in Embodiment 1.

[0040] Example 4: This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, it implements the steps of the wire rope tension-bending-torsion fatigue test method considering vibration and damage characteristics as described in Embodiment 1.

[0041] Example 5: This embodiment provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the wire rope tension-bending-torsion fatigue test method considering vibration and damage characteristics as described in Embodiment 1.

[0042] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A method for testing the tensile, bending, and torsional fatigue of steel wire ropes considering vibration and damage characteristics, characterized in that, Obtain the set operating speed of the sliding platform, the service time of the wire rope, and the ratio of the pulley to the wire rope diameter; Based on the set operating speed of the sliding platform, a preset range is determined; wherein the difference between the maximum and minimum speeds within the preset range and the set operating speed of the sliding platform is less than the set difference. Determine whether to replace the pulley based on the service life of the wire rope; if the pulley is not replaced, determine the adjustment strategy for the running speed of the sliding platform based on the diameter ratio of the pulley to the wire rope, and simulate the wear and tear of the wire rope. According to the set operating speed adjustment strategy, the sliding platform is controlled to continuously change speed and reciprocate within a preset range to carry out tensile, bending and torsional fatigue tests.

2. The method for testing the tension, bending, and torsion fatigue of wire ropes considering vibration and damage characteristics as described in claim 1, characterized in that, By controlling the frequency of speed changes within the reciprocating motion cycle of the sliding platform, the increased vibration caused by the increase in speed can be addressed.

3. The method for testing the tension, bending, and torsion fatigue of steel wire ropes considering vibration and damage characteristics as described in claim 2, characterized in that, A half-cycle is defined as the sliding platform moving from one end of the frame to the other. When the set operating speed of the sliding platform does not exceed the first set speed, the sliding platform changes speed only once within the preset range in each half-cycle. When the set operating speed of the sliding platform is greater than the first set speed but not greater than the second set speed, the sliding platform changes speed only twice within the preset range in each half-cycle. When the set operating speed of the sliding platform is greater than the second set speed but not greater than the third set speed, the sliding platform changes speed only four times within the preset range.

4. The method for testing the tension, bending, and torsion fatigue of wire ropes considering vibration and damage characteristics as described in claim 1, characterized in that, If the wire rope is used for no more than the preset time, the pulleys are not replaced. Instead, the wear is simulated by increasing or decreasing the speed of the sliding platform. If the wire rope is used for more than the preset time, different diameter ratios are simulated by replacing the pulleys with different diameters.

5. The method for testing the tension, bending, and torsional fatigue of wire ropes considering vibration and damage characteristics as described in claim 4, characterized in that, If the pulley is not replaced, and the diameter ratio of the pulley to the wire rope is greater than the preset diameter ratio, the speed of the sliding platform remains unchanged. If the diameter ratio of the pulley to the wire rope is not greater than the preset diameter ratio, the wire rope is severely worn, and the speed of the sliding platform should be increased.

6. The method for testing the tension, bending, and torsional fatigue of wire ropes considering vibration and damage characteristics as described in claim 1, characterized in that, Depending on the object being lifted, a pretension is applied. The greater the weight of the object being lifted by the wire rope, the greater the pretension, and vice versa. During acceleration, the tension is increased on top of the pretension, and the greater the acceleration value, the greater the increase in tension. During deceleration, the tension is reduced based on the pretension, and the greater the deceleration value, the greater the tension reduction; during uniform motion, the tension is adjusted back to the pretension value.

7. A wire rope tension-bending-torsion fatigue testing system considering vibration and damage characteristics, characterized in that, include: The data acquisition module is configured to: acquire the set running speed of the sliding platform, the usage time of the wire rope, and the ratio of the pulley to the wire rope diameter; The speed range determination module is configured to: determine a preset range based on the set operating speed of the sliding platform; wherein the difference between the maximum and minimum speeds within the preset range and the set operating speed of the sliding platform is less than the set difference. The operating speed adjustment module is configured to: determine whether to replace the pulley based on the service time of the wire rope; when the pulley is not replaced, determine the adjustment strategy for the operating speed of the sliding platform based on the diameter ratio of the pulley to the wire rope, simulating the wear condition of the wire rope; The test module is configured to control the sliding platform to continuously change speed and reciprocate within a preset range according to the set operating speed adjustment strategy, and to conduct tensile, bending and torsional fatigue tests.

8. A wire rope tension-bending-torsional fatigue testing device considering vibration and damage characteristics, characterized in that, It includes a tension regulator and a torque generator respectively installed at both ends of the frame, and a sliding platform installed on the frame; the two ends of the steel wire rope to be tested are connected to the tension regulator and the torque generator respectively, and the rope passes through the pulley group on the torque generator in the middle; the sliding platform is connected to a motor via a synchronous belt, and the motor is connected to a controller; The controller is configured to: determine a preset range based on the set operating speed of the sliding platform, and control the sliding platform to continuously change speed and reciprocate within the preset range; wherein the difference between the maximum and minimum speeds within the preset range and the set operating speed of the sliding platform is less than a set difference; determine whether to replace the pulley based on the service life of the wire rope; when the pulley is not replaced, determine an adjustment strategy for the set operating speed of the sliding platform based on the diameter ratio of the pulley to the wire rope to simulate the wear condition of the wire rope.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that, When the processor executes the program, it implements the steps of the wire rope tension-bending-torsional fatigue test method as described in any one of claims 1-5, which takes into account vibration and damage characteristics.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the wire rope tension-bending-torsional fatigue test method considering vibration and damage characteristics as described in any one of claims 1-5.

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