A full-scale fatigue test device for sling connectors under multi-factor coupling

Abstract

The present invention relates to a full-scale fatigue test device for a sling connector under multi-factor coupling, comprising a test fixture, a box beam ear plate, a sling connector, a dynamic load loading assembly, a static load loading assembly, a corrosion spray assembly and a wear application assembly; the test fixture is fixed on the ground, the box beam ear plate is fixed on the test fixture, one end of the sling connector is rotatably connected to the box beam ear plate through a rotating assembly, the other end of the sling connector is fixedly connected to the dynamic load loading assembly, the static load loading assembly is arranged on the test fixture, the static load loading assembly is sleeved on the upper part of the sling connector, the corrosion spray assembly is arranged outside the sling connector, and is used to spray a corrosion solution on the sling connector, and the wear application assembly is fixedly connected to the rotating assembly, and is used to apply a wear torque to the sling connector. The present invention can restore the real working conditions, simulate the real fatigue damage environment of the sling connector, and thus accurately evaluate the fatigue life and performance of the sling connector.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering tests, and in particular to a full-scale fatigue test device for a sling connector under multi-factor coupling. Background Art

[0002] The cable is an indispensable component of the force transmission of the suspension bridge. By transferring the load on the suspension bridge to the main cable or bridge tower, the normal operation of the long-span suspension bridge is guaranteed. In actual bridges, the safe bearing capacity of the cable has been fully considered during the design, and it is not easy to suffer strength failure under static load. However, under the action of alternating loads and random wind loads, the cable is subjected to changing axial loads and bending stresses, and the internal forces between the cables are constantly changing. This reciprocating change will cause the internal steel wire to be subjected to reciprocating alternating stress, which is easy to cause fatigue failure of the steel wire inside the cable structure, resulting in the stress of the steel wire section to produce a tension-bending combined stress cycle and produce steel wire fatigue, especially the short cable in the span is more prone to fatigue failure. Therefore, in order to release the torsional internal force in the cable, some suspension bridges install spherical bearings inside the cable connector at the bottom of the short cable to adapt to the mechanical characteristics of the cable. As an important load-bearing component for the transmission of force and torque in suspension bridges, this type of cable connector is composed of box beam lugs, fork-shaped lugs, pins, baffles, retaining rings, spherical bearings, anchor cups, sleeves and other parts. Among them, the box beam lugs are connected to the bridge deck, and the anchor cups and sleeves are connected to the upper cables. However, while this type of cable connector releases the internal force of the cable through spatial rotation, it also suffers from mutual extrusion and wear in the space between the upper and lower lugs. The coating surface paint of some steel components at the lower end of the cable, such as the sealing ring, sleeve, anchor cup, fork-shaped lug, etc., has local cracking and peeling. The fork-shaped lug of the anchor head under the cable is also generally slightly tilted, and red residue flows out of the outside of the cable connector. In addition, due to its long service life and long-term exposure to a complex environment with high temperature, high rain and corrosive media, it is subject to the combined effects of environmental corrosion, vehicle loads, random wind loads, fatigue effects and other factors. The three factors of wear, corrosion and fatigue will cause a significant reduction in the durability and bearing capacity of the cable connector. Therefore, exploring key wear, fatigue and corrosion areas, reducing fatigue loads on key areas such as sling connectors containing spherical bearings, and increasing the service life of sling connectors has aroused deep thinking among technical personnel in this field.

[0003] In actual working conditions, suspension bridges are mostly built in marine environments with multiple corrosive media. In addition to a large number of complex factors such as random wind loads and vehicle loads, cable connectors are often faced with the combined effects of multiple factors such as corrosion, fatigue and wear. There may be a coupling effect between these factors, that is, they influence, aggravate or promote each other. In this case, the development of fatigue test equipment under multi-factor coupling is of great significance for the design, evaluation and maintenance of cable connectors. However, the current fatigue test equipment for cable connectors is mainly based on several simplified assumptions. In the test, only the influence of fatigue load is often focused, while the role of other factors such as corrosion and wear is ignored. Such test design may not be able to fully simulate the complex multi-factor coupling environment faced by cable connectors in actual use. In addition, due to the limitations of existing test equipment, it is difficult to achieve full-scale testing, that is, it is impossible to conduct a complete test of cable connectors under actual working loads. Therefore, it is impossible to fully restore and evaluate the comprehensive coupling effects of multiple factors such as corrosion, wear and fatigue on cable connectors. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a full-scale fatigue test device for sling connectors under multi-factor coupling, which can restore the real working conditions, simulate the stress state of the sling connectors in actual operation, and reflect the fatigue damage state of the sling connectors under the multi-factor coupling of corrosion-fatigue-wear, so as to accurately evaluate the fatigue life and performance of the sling connectors.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A full-scale fatigue test device for a sling connector under multi-factor coupling comprises a test fixture, a box beam ear plate, a sling connector, a dynamic load loading assembly, a static load loading assembly, a corrosion spray assembly and a wear application assembly; the test fixture is fixed on the ground, the box beam ear plate is fixed on the test fixture, one end of the sling connector is rotatably connected to the box beam ear plate through a rotating assembly, the other end of the sling connector is fixedly connected to the dynamic load loading assembly, the static load loading assembly is arranged on the test fixture, the static load loading assembly is sleeved on the upper part of the sling connector, the corrosion spray assembly is arranged outside the sling connector and is used to spray a corrosion solution on the sling connector, and the wear application assembly is fixedly connected to the rotating assembly and is used to apply a wear torque to the sling connector.

[0007] Furthermore, the sling connecting piece includes a fixedly connected fork-shaped ear plate and a connecting rod, and the rotating assembly includes a pin shaft, a joint bearing and a bearing retaining ring, the pin shaft is connected to the connecting hole of the fork-shaped ear plate, the joint bearing is sleeved on the pin shaft, the box beam ear plate is sleeved on the joint bearing, and the bearing retaining rings are arranged on both sides of the joint bearing.

[0008] Furthermore, the rotating assembly also includes a baffle, which is located on both sides of the fork-shaped ear plate, and both ends of the pin shaft are provided with circumferential grooves that match the baffle, and the baffle is installed in the circumferential groove.

[0009] Furthermore, the static load loading assembly includes a load-bearing plate, a spring and a guide column. The load-bearing plate is located above the test fixture. The load-bearing plate and the test fixture are fixedly connected by the guide column. A through hole is provided in the middle of the load-bearing plate. The load-bearing plate is sleeved on the upper part of the sling connector through the through hole. The spring is sleeved on the guide column, and the spring is in a compressed state.

[0010] Furthermore, there are four guide posts, which are respectively arranged at four corners of the bearing plate, and springs are sleeved on the four guide posts.

[0011] Furthermore, the dynamic load loading assembly includes a fatigue testing machine and a first servo actuator, the first servo actuator is fixedly connected to the crossbeam of the fatigue testing machine, and the top end of the sling connector passes through the through hole of the bearing plate and is fixedly connected to the first servo actuator.

[0012] Furthermore, the corrosion spray assembly includes a corrosion solution container, a pump body and multiple nozzles. The corrosion solution container and the pump body are located outside the test fixture. The multiple nozzles are fixedly connected to the supporting plate. The multiple nozzles are evenly arranged around the sling connector. The corrosion solution container transports the corrosion solution to the nozzles through the pump body.

[0013] Furthermore, the wear applying assembly includes two torsion bars and a second servo actuator, the two torsion bars are fixedly connected to the two ends of the pin shaft respectively, the two torsion bars are connected by a connecting rod, and the second servo actuator is hinged to the connecting rod.

[0014] Furthermore, the test fixture is a rectangular frame with ribs around it, and the rectangular frame is fixed to the ground by bolts.

[0015] Furthermore, the box beam ear plate is fixed to the bottom of the test fixture by bolts, and an elastic damping gasket is provided between the box beam ear plate and the bottom of the test fixture, and the elastic damping gasket is sleeved on the bolts.

[0016] The present invention has the following advantages:

[0017] 1. Compared with the existing fatigue test device, the present invention fills the gap of fatigue test device for sling connectors under the coupling of corrosion, fatigue and wear. The full-scale fatigue test device of the present invention can restore the real working conditions and simulate the complex environment and load conditions faced by sling connectors in actual working conditions. Through the dynamic load loading component, static load loading component, corrosion spray component and wear application component, multiple factors such as fatigue load, corrosion and wear are applied simultaneously in the test, which can truly simulate the stress state of the sling connector in actual operation, so as to accurately evaluate the fatigue life and performance of the sling connector.

[0018] 2. The present invention can help researchers gain a deeper understanding of the coupling effects between different factors of sling connectors. By quantitatively measuring the effects of various factors on the fatigue life of sling connectors, the interaction mechanism and comprehensive effects between different factors can be revealed, providing more accurate data and basis for the design and prediction of sling connectors.

[0019] 3. The present invention can obtain fatigue life data of sling connectors under specific working conditions. Based on these data, researchers can carry out life prediction and evaluation, further analyze the life change trend and influencing factors of sling connectors under different working conditions, and provide a scientific basis for service life assessment and maintenance plan formulation of sling connectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a full-scale fatigue test device for sling connectors under multi-factor coupling of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the test fixture, static load loading assembly, corrosion spray assembly and wear application assembly of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the test fixture, static load loading assembly, corrosion spray assembly and wear application assembly of the present invention from another angle.

[0023] Figure 4 It is a structural schematic diagram of the sling connector and the rotating assembly of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the connection between the sling connector and the box beam ear plate of the present invention.

[0025] Figure 6 This is a structural schematic diagram of another angle of connection between the sling connector and the box beam ear plate of the present invention

[0026] Figure 7 It is a structural schematic diagram of the spherical bearing and the bearing retaining ring of the present invention.

[0027] Among them, 1 is a test fixture, 101 is a rectangular frame, 102 is a bolt, 103 is an elastic damping gasket, 2 is a box beam ear plate, 3 is a sling connector, 301 is a fork-shaped ear plate, 302 is a connecting rod, 303 is a connecting hole, 4 is a dynamic load loading assembly, 401 is a fatigue testing machine, 401a is a crossbeam, 401b is a longitudinal beam, 401c is a crossbeam frame, 402 is a first servo actuator, 5 is a static load loading assembly, 501 is a load-bearing plate, 501a is a through hole, 501b is a mounting hole, 502 is a spring, 503 is a guide column, 6 is a corrosion spray assembly, 601 is a nozzle, 7 is a wear application assembly, 701 is a torsion rod, 702 is a second servo actuator, 8 is a rotating assembly, 801 is a pin, 802 is a spherical bearing, 803 is a bearing retaining ring, 804 is a baffle, and 805 is a circumferential groove. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] like Figure 1-3 As shown, a full-scale fatigue test device for a sling connector under multi-factor coupling includes a test fixture, a box beam ear plate, a sling connector, a dynamic load loading assembly, a static load loading assembly, a corrosion spray assembly and a wear application assembly; the test fixture is fixed on the ground, the box beam ear plate is fixed on the test fixture, one end of the sling connector is rotatably connected to the box beam ear plate through a rotating assembly, the other end of the sling connector is fixedly connected to the dynamic load loading assembly, the static load loading assembly is arranged on the test fixture, the static load loading assembly is sleeved on the upper part of the sling connector, the corrosion spray assembly is arranged outside the sling connector, and is used to spray a corrosion solution on the sling connector, and the wear application assembly is fixedly connected to the rotating assembly, and is used to apply a wear torque to the sling connector. The dynamic load loading component can be used to load dynamic loads on the sling connector to simulate the actual alternating load stress process of the sling connector; the static load loading component can be used to load static loads on the sling connector to simulate the static load borne by the sling connector under actual working conditions; the corrosion spray component can be used to spray corrosion solutions on the sling connector to simulate the actual corrosion environment of the sling connector; the wear application component can be used to apply wear torque to the sling connector to simulate the relative motion relationship and wear state between the internal components of the sling connector under actual working conditions. The dynamic load loading component, static load loading component, corrosion spray component and wear application component can be used to carry out full-scale fatigue tests on the sling connector of the suspension bridge under the coupling of multiple factors such as corrosion-fatigue-wear, thereby simulating the actual damage state of the sling connector under actual environmental conditions and solving the problem that the existing fatigue test equipment does not fully consider and is not accurate in the test environment.

[0030] like Figure 4-7As shown, the sling connector includes a fixedly connected fork-shaped ear plate and a connecting rod, and the rotating assembly includes a pin shaft, a spherical bearing and a bearing retaining ring. The pin shaft is connected to the connecting hole of the fork-shaped ear plate, the spherical bearing is sleeved on the pin shaft, the box beam ear plate is sleeved on the spherical bearing, and the bearing retaining ring is arranged on both sides of the spherical bearing to prevent axial movement of the spherical bearing.

[0031] like Figure 4-6 As shown, the rotating assembly also includes a baffle, which is located on both sides of the fork-shaped ear plate. Both ends of the pin shaft are provided with circumferential grooves that match the baffle, and the baffle is installed in the circumferential groove to prevent the pin shaft from axial movement.

[0032] like Figure 2 and Figure 3 As shown, the static load loading assembly includes a bearing plate, a spring and a guide column. The bearing plate is located above the test fixture. The bearing plate and the test fixture are fixedly connected by the guide column. A through hole is provided in the middle of the bearing plate. The bearing plate is sleeved on the upper part of the sling connector through the through hole. The spring is sleeved on the guide column, and the spring is in a compressed state. In this embodiment, the number of guide columns is four, and the four guide columns are respectively arranged at the four corners of the bearing plate. The four guide columns are sleeved with springs. The four springs are in a compressed pre-tightened state and store a certain elastic potential energy. When the test device works normally, the release of the elastic potential energy of the four springs converts the elastic force into a static load on the sling connector through the force transmission between the components, thereby ensuring the loading of the static load of the sling connector under actual working conditions and preventing the loss of static load due to loose bolts or internal wear. When the suspension bridge is completed, there will be a certain pre-tightening force of the sling, and the gravity of the bridge deck on the sling when it is not open to traffic. These two forces synthesize the static load on the sling connector. The static load loading assembly can be used to load static loads on the sling connector of the test object, simulating the actual static load state of the sling connector under actual working conditions. The spring must have appropriate stiffness and rated load, and its preload must be determined to achieve the required load range. The elastic recovery force of the spring must meet the deformation and fatigue life requirements in the test.

[0033] like Figure 1 and Figure 2As shown, the dynamic load loading assembly includes a fatigue testing machine and a first servo actuator. The first servo actuator is fixedly connected to the crossbeam of the fatigue testing machine. The top end of the sling connector passes through the through hole of the bearing plate and is fixedly connected to the first servo actuator. The through hole mainly plays a positioning and guiding role. In this embodiment, the fatigue testing machine includes two longitudinal beams, a cross beam and a cross beam frame. The two longitudinal beams are correspondingly arranged on the ground, and the lower base of the longitudinal beam is fixed to the ground by bolts to ensure the stability of the fatigue testing machine; the cross beam is connected between the two longitudinal beams by bolts, and the two ends of the cross beam have multiple threaded holes, and the longitudinal beam is correspondingly provided with multiple bolt holes. The cross beam is transversely connected to the longitudinal beam by bolts, and the vertical distance between the cross beam and the ground can be adjusted by connecting the bolt holes at different positions, and the relative position of the first servo actuator and the test fixture can be indirectly adjusted; the cross beam frame is slidably sleeved on the cross beam, and the bottom of the cross beam frame is fixedly connected to the first servo actuator. Specifically, the top of the first servo actuator is fixedly connected to the cross beam frame by bolts, and the bottom of the first servo actuator is fixedly connected to the sling connector by a coupling, and the first servo actuator provides dynamic load for the test object sling connector. The first servo actuator is controlled by a drive system, and the drive system can control the load loading method and size of the first servo actuator.

[0034] The cable connector of the suspension bridge will generate alternating loads due to the dynamic load of vehicles on the bridge deck and random wind loads. Through the dynamic load loading component, the first servo actuator is driven by the drive system, so that the dynamic load can be loaded on the cable connector of the test object to simulate the actual alternating load stress process of the cable connector.

[0035] The first servo actuator is selected based on characteristics such as torque generation capability, speed range, accuracy and response time. In the present embodiment, the first servo actuator is a servo hydraulic cylinder. For the drive system, according to the application requirements, a matching drive system is selected to provide the required power, control accuracy, response speed, loading frequency and loading force. The drive system includes a servo motor driver, a hydraulic servo valve, a pneumatic servo controller, etc. In the present embodiment, the drive system is a servo hydraulic control system. In addition, a position feedback sensor such as an encoder, a photoelectric encoder, a Hall sensor, etc. can be provided as required to measure and feedback the position of the first servo actuator.

[0036] like Figure 2 and Figure 3As shown, the corrosion spray assembly includes a corrosion solution container, a pump body and a plurality of nozzles. The corrosion solution container and the pump body are located outside the test fixture (not shown in the figure). The plurality of nozzles are fixedly connected to the bearing plate. The plurality of nozzles are evenly arranged around the sling connector, so that the corrosion solution can be evenly sprayed on the surface of the sling connector. The corrosion solution container delivers the corrosion solution to the nozzle through the pump body, and the corrosion environment solution in the actual working condition is sprayed on the sling connector through the nozzle according to a certain proportion. At the same time, the flow rate and spraying method of the corrosion solution must be consistent with the actual working condition, so that the sling connector is in a corrosive environment, ensuring that the test is carried out in a corrosion environment close to the real one. In this embodiment, a plurality of mounting holes are provided on the bearing plate, and the nozzles are fixed in the mounting holes.

[0037] The choice of corrosive solution is determined by the actual working conditions being studied. For example, if you want to simulate corrosion in a seawater environment, you can use a salt water solution of appropriate concentration. For other specific environments, such as acidic or alkaline environments, you need to select the corresponding acidic or alkaline solution. According to a certain solution ratio, the concentration of the corrosive liquid is accurately controlled according to actual needs. In order to ensure that the temperature and humidity in the test environment match the actual working conditions, a constant temperature and humidity device or a heating system can be configured to control the temperature of the test area, a humidifying device or a drying system can be configured to adjust the ambient humidity, and a corrosion rate measuring device can be configured to perform regular corrosion rate measurements on the test samples to evaluate the development and impact of the corrosion process.

[0038] like Figure 1-3 As shown, the wear application assembly includes two torsion bars and a second servo actuator, the two torsion bars are fixedly connected to the two ends of the pin shaft respectively, the two torsion bars are connected by a connecting rod, and the second servo actuator is hinged to the connecting rod. In this embodiment, the two torsion bars are welded and fixed to the two ends of the pin shaft respectively, the two torsion bars are connected by a connecting rod, the connecting rod is a transverse circular rod, the second servo actuator is hinged to the transverse circular rod, and the second servo actuator is arranged on one side of the test fixture. A control system is also arranged on the outside of the wear application assembly, the control system controls the loading of the load of the second servo actuator, the control system controls the second servo actuator to move up and down, drives the connecting rod to move up and down, and then drives the torsion bar to rotate up and down, so that the pin shaft rotates repeatedly around the axis of the box beam ear plate and the fork ear plate, thereby realizing the loading of the wear torque of the sling connector, and accurately simulating the relative motion relationship and wear state between the internal components of the sling connector under actual working conditions. In this embodiment, the second servo actuator is a hydraulic cylinder, and the control system is a servo hydraulic control system. The torsion bar needs to have a stable structure, sufficient rigidity and appropriate length, so that the force of the second servo actuator can be accurately converted into the torsion force required for the test.

[0039] In addition, according to the test requirements and the actual working conditions studied, wear media that can accurately simulate the wear environment of the sling connector, such as wear oil, abrasive liquid or abrasive powder, can be added. A lubrication system can also be set up to ensure that the surface of the sling connector is properly lubricated during the wear process. The lubricant is selected according to the test requirements and the characteristics of the connector material. A wear displacement sensor or other measuring device can also be set up to monitor and record the displacement of the sling connector during the wear process in real time, which helps to evaluate the wear behavior and wear amount changes of the sling connector, as well as the impact of wear on the performance of the sling connector. A wear torque control system and sensor can also be set up to monitor and control the wear torque applied in the test to ensure the stability and accuracy of the wear torque to simulate the wear process of the sling connector under actual working conditions. A torque adjustment device, such as a servo actuator, motor, pneumatic drive or liquid diffuser, can also be set up to adjust the torque applied to the sling connector. In addition, a closed-loop feedback control system can be configured to adjust and calibrate the actual torque measurement value in real time by comparing it with the preset torque value to ensure that the applied torque is within the set range.

[0040] like Figure 1-3 As shown in the figure, the test fixture is a rectangular frame with ribs around it. The rectangular frame has a certain thickness and is used to carry the sling connector. The rectangular frame is fixed to the ground by bolts to carry the test object and the test load, and serves as an operating platform for the test. The preload force of the spring is controlled to ensure that the static load applied by the bolt is not lost.

[0041] like Figure 1-6 As shown, the box beam ear plate is fixed to the bottom of the test fixture by bolts. In order to provide the pre-static load of the sling connector, the sling connector and the box beam ear plate are connected to each other and placed inside the test fixture. The top of the sling connector passes through the through hole of the load-bearing plate and is fixedly connected to the first servo actuator. An elastic damping gasket is also provided between the box beam ear plate and the bottom of the test fixture, and the elastic damping gasket is sleeved on the bolts. The elastic damping gasket can absorb external vibration and vibration and convert it into energy inside the gasket, thereby reducing the transmission of vibration. It can also reduce the friction and impact between the box beam ear plate and the bottom of the test fixture under random loads.

[0042] The full-scale fatigue test device also includes a data acquisition and recording system (not shown in the figure). The data acquisition and recording system is respectively connected to the sling connector, dynamic load loading assembly, static load loading assembly, corrosion spray assembly and wear application assembly signal, and can record and store relevant data in the corrosion, wear and fatigue process in the test in real time, such as load, displacement, strain, temperature, etc. By analyzing and processing the data, the performance and life of the sling connector can be evaluated, and relevant test results and conclusions can be provided to ensure the stability and safety of the full-scale fatigue test device. In addition, protective devices such as spray protection covers, emergency shutdown devices and safety sensing devices can be set to prevent accidents.

[0043] Compared with the existing fatigue test device, this full-scale fatigue test device fills the gap of fatigue test devices for sling connectors under the coupling of corrosion, fatigue and wear factors. The device can simulate the real fatigue damage environment of sling connectors, and has the advantages of clear load transfer, simple structure, complete test influencing factors, and easy operation. The present invention also takes into account the wear force and the stress state of the static load internal force of the sling connector, and can simulate the key positions of the sling connector and the damage mode and corrosion condition of the key components. The test results can provide important test basis for the calculation and full utilization of the fatigue life of the sling connector, and can also comprehensively evaluate the damage state of the sling connector during operation, which has significant scientific value and social benefits. In short, its design is simple, the test influencing factors are comprehensive, and the coupling effect of the three factors of corrosion, wear and fatigue is considered, so that the fatigue test can more realistically simulate the working state of the sling connector, and provide an effective test means for the performance evaluation and life prediction of the sling connector.

[0044] In general, the present invention can restore the real working conditions and simulate the complex environment and load conditions faced by the sling connector in the actual working conditions. By applying multiple factors such as fatigue load, corrosion and wear in the test at the same time through the dynamic load loading component, the static load loading component, the corrosion spray component and the wear application component, the stress state of the sling connector in actual operation can be more realistically simulated, so as to more accurately evaluate the fatigue life and performance of the sling connector. The present invention can help researchers to gain an in-depth understanding of the coupling effect between different factors of the sling connector. By quantitatively measuring the influence of various factors on the fatigue life of the sling connector, the interaction mechanism and comprehensive effect between different factors can be revealed, providing more accurate data and basis for the design and prediction of the sling connector. The present invention can obtain the fatigue life data of the sling connector under specific working conditions. Based on these data, researchers can carry out life prediction and evaluation, further analyze the life change trend and influencing factors of the sling connector under different working conditions, and provide a scientific basis for the service life assessment and maintenance plan formulation of the sling connector.

[0045] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A full-scale fatigue test device for sling connectors under multi-factor coupling, characterized in that: It includes a test fixture, a box beam ear plate, a sling connector, a dynamic load loading component, a static load loading component, a corrosion spray component and a wear application component; the test fixture is fixed on the ground, the box beam ear plate is fixed on the test fixture, one end of the sling connector is rotatably connected to the box beam ear plate through a rotating component, the other end of the sling connector is fixedly connected to the dynamic load loading component, the static load loading component is arranged on the test fixture, the static load loading component is sleeved on the upper part of the sling connector, the corrosion spray component is arranged outside the sling connector, and is used to spray a corrosion solution on the sling connector, and the wear application component is fixedly connected to the rotating component, and is used to apply a wear torque to the sling connector; The sling connecting piece includes a forked ear plate and a connecting rod that are fixedly connected, and the rotating assembly includes a pin shaft, a joint bearing and a bearing retaining ring. The pin shaft is connected to the connecting hole of the forked ear plate, the joint bearing is sleeved on the pin shaft, the box beam ear plate is sleeved on the joint bearing, and the bearing retaining ring is arranged on both sides of the joint bearing; The wear applying assembly includes two torsion bars and a second servo actuator, the two torsion bars are fixedly connected to the two ends of the pin shaft respectively, the two torsion bars are connected by a connecting rod, and the second servo actuator is hinged to the connecting rod; The static load loading assembly includes a load-bearing plate, a spring and a guide column. The load-bearing plate is located above the test fixture. The load-bearing plate and the test fixture are fixedly connected by the guide column. A through hole is provided in the middle of the load-bearing plate. The load-bearing plate is sleeved on the upper part of the sling connector through the through hole. The spring is sleeved on the guide column, and the spring is in a compressed state.

2. The full-scale fatigue test device for sling connectors under multi-factor coupling according to claim 1 is characterized in that: The rotating assembly also includes a baffle, which is located on both sides of the fork-shaped ear plate. Both ends of the pin shaft are provided with circumferential grooves matched with the baffle, and the baffle is installed in the circumferential groove.

3. The full-scale fatigue test device for sling connectors under multi-factor coupling according to claim 1 is characterized in that: There are four guide posts, which are respectively arranged at four corners of the bearing plate, and springs are sleeved on the four guide posts.

4. The full-scale fatigue test device for sling connectors under multi-factor coupling according to claim 1 is characterized in that: The dynamic load loading assembly comprises a fatigue testing machine and a first servo actuator, the first servo actuator is fixedly connected to the crossbeam of the fatigue testing machine, and the top end of the sling connector passes through the through hole of the bearing plate and is fixedly connected to the first servo actuator.

5. The full-scale fatigue test device for sling connectors under multi-factor coupling according to claim 1 is characterized in that: The corrosion spray assembly includes a corrosion solution container, a pump body and multiple nozzles. The corrosion solution container and the pump body are located outside the test fixture. The multiple nozzles are fixedly connected to the load-bearing plate. The multiple nozzles are evenly arranged around the sling connector. The corrosion solution container transports the corrosion solution to the nozzles through the pump body.

6. The full-scale fatigue test device for sling connectors under multi-factor coupling according to claim 1 is characterized in that: The test fixture is a rectangular frame with ribs around it, which is fixed to the ground by bolts.

7. The full-scale fatigue test device for sling connectors under multi-factor coupling according to claim 1 is characterized in that: The box beam ear plate is fixed to the bottom of the test fixture by bolts. An elastic damping gasket is also arranged between the box beam ear plate and the bottom of the test fixture, and the elastic damping gasket is sleeved on the bolts.

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