Device and Method for Testing the Tensile, Bending, Torsional, Frictional Corrosion Fatigue of Hoisting Cables in Ultra-Deep Vertical Shafts

Abstract

This invention relates to a device and method for testing the tensile, bending, torsional, frictional, and corrosion fatigue of hoisting cables in ultra-deep vertical shafts. The device includes a frame module, a tensile-torsional coupling drive module, a torsional drive module, a corrosion-controlled temperature and lubrication environment module, a friction bending fixture module, a data acquisition module, and a data processing module. It achieves dynamic synergistic coupling of tensile, bending, and torsional loads. By coaxially arranging the tensile-torsional coupling drive module and the torsional drive module, and utilizing the coordinated control of a high-precision servo motor and an electric cylinder, dynamic tensile and torsional loads can be applied to the cable sample synchronously or asynchronously. Combined with the friction bending fixture module arranged in the middle, it achieves synchronous loading of tensile, bending, and torsional loads, accurately simulating the actual service mechanical state of ultra-deep vertical shaft cables.

Description

Technical Field

[0001] This invention relates to the field of safety monitoring technology for hoisting in deep mineral resource development, specifically to a device and method for testing the fatigue performance of hoisting cables in ultra-deep vertical shafts under tensile, bending, torsion, friction, and corrosion conditions. The device and method can simulate the fatigue performance of cables under complex contact modes of tension, bending, torsion, and friction, as well as the coupling effects of corrosion, temperature, and lubrication in ultra-deep vertical shaft hoisting environments. Background Technology

[0002] Metallic mineral resources are the strategic cornerstone supporting the operation of my country's industrial system and the development of the national economy. With the acceleration of my country's industrialization and the rise of emerging industries, the contradiction between resource supply and demand has become a prominent bottleneck restricting my country's economic development. Moving into deeper areas has become an inevitable trend in the development of metallic mineral resources. Ultra-deep vertical shafts are the core channels connecting underground space, resource transportation, and deep engineering construction; their construction is the lifeline of deep resource extraction. The hoisting system of ultra-deep vertical shafts is the "main artery" during construction, undertaking key tasks such as personnel transportation, material lifting, and the transfer of drilling equipment. The hoisting wire rope, as the core flexible load-bearing component of the ultra-deep vertical shaft hoisting system, is wound in multiple layers around the winch drum at one end, and guided vertically into the shaft by the sheave at the other end, connecting to the carriage and hook. It achieves the lifting and lowering of the bucket by winding it in or out of the winch drum, and is the "lifeline" ensuring the safety of ultra-deep shaft construction. Once the wire rope fails, it can lead to construction stoppage at best, and equipment damage or even major casualties at worst, seriously affecting the operational safety and efficiency of ultra-deep vertical shaft construction. The hoisting system for ultra-deep vertical shaft construction is characterized by large transport distance (hoisting height exceeding 1500m), high rope speed (up to 8m / s), heavy load (the weight of the wire rope itself, the bucket and materials reaches 40t), and large derrick height (up to 33m). During operation, the acceleration / deceleration during start-up and braking, the continuous winding and unwinding of the multi-layer wound wire rope, the special helical twisting characteristics of the wire rope, the transition between layers / turns of the multi-layer wound wire rope, and the low-frequency vibration of the hoisting machine all lead to different directional loads and longitudinal-lateral-torsional coupled vibration characteristics of the hoisting system. This causes the wire rope of the construction vertical shaft hoisting system to exhibit time-varying dynamic behavior, which easily leads to the wire rope being subjected to tensile, bending and torsional stresses, as well as contact and slippage behavior with different friction pairs. Meanwhile, the construction environment of ultra-deep vertical shafts is extremely harsh, often accompanied by water (acidic or alkaline), high humidity, high temperature, and rock dust. This causes the wire ropes to be in a state of alternating wet and dry conditions and rich in corrosive media for a long time, which easily leads to electrochemical corrosion and oxidation. This easily causes the wire ropes to exhibit frictional corrosion fatigue behavior under complex tensile, bending, and torsional conditions, resulting in wear, corrosion, and wire breakage, reducing their load-bearing strength, leading to frequent replacements, significantly shortened service life, and even inducing rope breakage accidents. Therefore, it is necessary to develop a tensile, bending, torsional, frictional corrosion fatigue testing device for ultra-deep vertical shaft hoisting cables, propose a testing method for ultra-deep vertical shaft hoisting system cables, explore the tensile, bending, torsional, frictional corrosion fatigue behavior of wire ropes in ultra-deep vertical shaft construction hoisting systems, and reveal the gradual deterioration damage mechanism during service. This is of great significance for ensuring the load-bearing safety and service reliability of wire ropes in ultra-deep vertical shaft construction hoisting systems.

[0003] Regarding cable friction corrosion fatigue, patent CN106290035A addresses the problem of friction corrosion fatigue failure of wound hoisting wire ropes in ultra-deep vertical shafts. It designs a testing device consisting of a support system, tension-tension fatigue simulation, isothermal corrosion simulation, dynamic loading, and a monitoring system, along with a standardized testing method for wire rope friction corrosion fatigue. However, this device has significant limitations: it does not simulate the actual bending and torsional loads of the cable, lacks lubrication field coupling, and has insufficient friction simulation and load synergy capabilities, resulting in a significant deviation from the actual service conditions of cables in ultra-deep vertical shafts. Patent CN116698645A addresses the problems of corrosion, bending fatigue, and easy failure of hoisting wire ropes in deep-sea drilling rigs due to friction coupling of multiple pairs. It designs an adjustable wire rope crossing angle and wrap angle, simulating a marine electrochemical corrosion environment, and includes a standardized testing method. However, this patent has significant shortcomings: it lacks a torsional load loading module, does not incorporate the coupling effects of temperature and lubrication fields, does not consider the high-pressure characteristics of deep sea in its corrosion simulation, and relies on static loading with weights for contact loads. Patent CN120213798A proposes a bending friction fatigue testing device and supporting method with a testing box. It simulates seawater immersion by filling the testing box with seawater, uses a height-adjustable long pulley to simulate water pressure, and employs a coral rock simulation layer or rubber hose in the cable groove to simulate deep-sea friction. Bending friction simulation is achieved by reciprocating traction of the steel wire rope via a drive component. However, this patent has significant shortcomings: it lacks a torsional load loading module, fails to simulate critical environments such as deep-sea high pressure and temperature changes, lacks electrochemical corrosion monitoring, and lacks precise control of tensile loads, making it unsuitable for testing ultra-deep vertical shaft cables. Patent CN104729987A designs a comprehensive friction testing device and method for mine hoist steel wire ropes and friction pads, capable of simulating these three friction conditions. However, this patent lacks bending and torsional load loading modules, fails to simulate complex environments such as corrosion, lacks coupling testing of fatigue loads and friction, and can only monitor surface damage, making it unsuitable for testing the multi-load coupling of tension, bending, and torsion in ultra-deep vertical shaft cables. In summary, existing cable testing devices all lack a torsional load loading module, fail to achieve dynamic coordinated coupling of tensile, bending, and torsional composite loads, and have insufficient physical field coupling dimensions, failing to achieve comprehensive coupling of multiple fields such as corrosion, temperature, and lubrication. Some only simulate a single corrosion field, which cannot meet the requirements for cable tensile, bending, torsional, frictional corrosion fatigue testing under ultra-deep vertical shaft conditions. Summary of the Invention

[0004] This invention overcomes the shortcomings of existing technologies by providing a device and method for testing the tensile, torsional, frictional, and corrosion fatigue of hoisting cables in ultra-deep vertical shafts. It can simulate the tensile, torsional, and bending coupled frictional contact behavior of cables in ultra-deep vertical shaft hoisting systems with different friction pairs (cable, drum groove, drum side baffle) under multi-physical field coupling conditions of corrosion, high temperature, and lubrication. The invention reveals the deterioration behavior of cable bending fatigue frictional corrosion damage and its influence by frictional and environmental parameters, providing a reliable experimental means for revealing the damage evolution mechanism and life prediction of cables.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fatigue testing device for tension, bending, torsion, friction, corrosion and ultra-deep vertical shaft hoisting cable, comprising a frame module, a tension-torsion coupling drive module, a torsion drive module, a corrosion temperature-controlled lubrication environment module, a friction-bending fixture module, a data acquisition module and a data processing module; The frame module provides a rigid mounting foundation for the entire device, including a base plate, a tension-torsion support table, a torsion support table, and an inclined support plate, wherein the tension-torsion support table, torsion support table, and inclined support plate are arranged in a triangular pattern; the tension-torsion coupling drive module is mounted on the tension-torsion support table; the torsion drive module is mounted on the torsion support table; the friction bending fixture module is mounted on the inclined support plate; the tension-torsion coupling drive module, the torsion drive module, and the friction bending fixture module are connected in series by cables; The corrosion temperature-controlled lubrication environment module includes a sealed environment box, a temperature control component, and a corrosive medium circulation spray component; the sealed environment box is fixed on an inclined support plate, and the friction bending fixture module is located inside the cavity of the sealed environment box; the temperature control component is used to control the temperature inside the sealed environment box to achieve bidirectional temperature regulation; the corrosive medium circulation spray component is used to simulate the wellbore water spraying environment; The data acquisition module is connected to the tensile torsion coupling drive module, the torsion drive module, the corrosion temperature control lubrication environment module, and the friction bending fixture module, respectively, to collect mechanical, environmental, and frictional parameters in real time during the test. The data processing module receives signals from the data acquisition module to realize synchronous control of test parameters, real-time data processing and analysis, and test status monitoring.

[0006] The base plate has linearly and evenly distributed bolt holes, and the base plate of the inclined support plate has mounting holes that match the bolt holes.

[0007] The tension-torsion coupling drive module includes a servo electric cylinder, a servo torsion motor I, a spoke-type tension sensor I, a sliding plate, a cable tension-torsion clamp, a sliding guide rail, a coupling I, and an axial tension transmission assembly I. The servo electric cylinder I is fixed on the base plate, the servo torsion motor I and the axial tension transmission assembly I are coaxially mounted on the sliding plate, the output end of the servo electric cylinder I is connected to the sliding plate, and the sliding plate is mounted on the sliding guide rail and can slide back and forth along the sliding guide rail. The servo torsion motor I is connected to the axial tension transmission assembly I via a coupling I. The spoke-type tension sensor I is installed between the axial tension transmission assembly I and the cable tension torsion clamp. The axial tension transmission assembly I includes a bidirectional thrust ball bearing and a deep groove ball bearing sequentially mounted on a rotating shaft.

[0008] The torsion drive module includes a servo torsion motor II, a spoke-type tension sensor II, a coupling II, an axial tension transmission assembly II, and a cable torsion clamp. The servo torsion motor II drives the cable to rotate around its axis through the axial tension transmission assembly II. The servo torsion motor II is connected to the axial tension transmission assembly II through the coupling II. The spoke-type tension sensor II is installed between the axial tension transmission assembly II and the cable torsion clamp. The axial tension transmission assembly II includes a bidirectional thrust ball bearing and a deep groove ball bearing sequentially mounted on the rotating shaft.

[0009] The sealed environment chamber has elliptical through holes on both sides, a tempered anti-corrosion glass transparent observation window and a protective cover on the side, and a waste liquid collection tank and a drain valve at the bottom; the edges of the through holes are equipped with fluororubber sealing sleeves.

[0010] The friction bending fixture module includes a friction bending fixture and a replaceable friction pair assembly, which is mounted on the friction bending fixture. The friction bending fixture includes a single-groove fixture and a double-groove fixture.

[0011] The temperature control component includes a liquid conduit, a circulating temperature controller, and a temperature sensor. The liquid conduit is installed on both sides inside the sealed environment chamber. The circulating temperature controller is installed on the bottom plate outside the environment chamber. The temperature sensor is installed on the inner wall of the sealed environment chamber.

[0012] The corrosion temperature control lubrication environment module also includes a humidity regulation component, including an ultrasonic humidifier, a dehumidifier, and a humidity sensor. The ultrasonic humidifier is installed on one side of the sealed environment box, the dehumidifier is installed on the other side of the sealed environment box, and the humidity sensor is installed inside the sealed environment box.

[0013] The corrosive medium circulating spray assembly includes a storage tank, a micro metering pump, a spray head, a flow regulating valve, a stirrer, and a level sensor. The storage tank is mounted on a base plate, and the spray head is mounted in a sealed environment chamber. The micro metering pump and the flow regulating valve are connected in series between the storage tank and the sealed environment chamber. The stirrer and the level sensor are mounted inside the storage tank.

[0014] The data acquisition module includes an industrial control computer, a signal conditioner, a multi-channel data acquisition card, a displacement sensor, a torque sensor, and a bending stress sensor. The industrial control computer is mounted on a base plate, and the signal conditioner and the multi-channel data acquisition card are connected in series on the industrial control computer. The displacement sensor, torque sensor, and bending stress sensor are respectively connected to the multi-channel data acquisition card. The displacement sensor is mounted on the servo electric cylinder. The torque sensor is mounted on the output terminals of servo torsion motor I and servo torsion motor II. The bending stress sensor is mounted on the surface of the bending section of the cable.

[0015] The data processing module includes an industrial computer, a display unit, and an alarm unit; the display unit is a high-definition industrial display and is connected to the industrial computer; the alarm unit includes a buzzer and an alarm light, which are respectively connected to the industrial computer.

[0016] A method for testing the tensile, bending, torsional, frictional, and corrosion fatigue of hoisting cables in ultra-deep vertical shafts, characterized in that... S1. Select a cable that is consistent with the actual use as a sample. The sample length is 1500-2500mm and the diameter is 6-30mm. Pre-treat the sample: remove surface oil, oxide layer and floating rust, sand it smooth with sandpaper, wipe it with anhydrous ethanol, and let it dry for later use. S2. Check the connection status of each module of the device to ensure that there is no leakage in the sealed environment box. Use standard weights and standard torque meter to calibrate each sensor to ensure that the measurement error is no greater than ±1%, and record the calibration data. S3. Run the tension and torsion coupling drive module and torsion drive module under no-load for 5-10 minutes, and run the corrosion temperature control lubrication environment module under no-load for 3-5 minutes to check the operation of each component and the status of media spraying and temperature regulation. S4. Set the tensile, torsion, bending, friction, environmental parameters and test termination conditions through the data processing module; S5. Clamp one end of the pretreated sample in the cable tension and torsion fixture of the tension and torsion coupling drive module, and clamp the other end through the sealing sleeve of the sealed environment box and the friction bending fixture in the cable torsion fixture of the torsion drive module to ensure that the sample axis is coaxial and aligned with the axes of the two drive modules, and the coaxiality deviation is not greater than 1°. S6. Adjust and fix the bending radius of the friction bending fixture, install the preset friction pair and adjust the contact pressure to the preset value, adjust the position of the sealed environment box so that the test section of the sample is completely inside the box and fix it. S7. Start the data acquisition module and data processing module, apply pre-tension load and pre-torsion load to the sample. The pre-tension load is 0.2 times the nominal breaking tensile force and is held for 5 minutes. The pre-torsion angle is 10% of the preset torsion angle and is held for 3 minutes. Start the corrosion temperature control and lubrication environment module, adjust it to the preset parameters and run it for 3-5 minutes. Check the stability of each parameter. S8. Issue the test start command. Each module works according to the preset parameters to realize dynamic collaborative loading of tension and torsion composite load, bending friction simulation and multi-physics field coupling environment simulation. The data acquisition module collects parameters in real time and transmits them to the data processing module. The data processing module processes and analyzes, plots curves and stores data in real time. S9. When the test reaches the preset termination condition, a termination command is automatically issued, the device stops running, the data processing module saves all data and curves and generates a test termination report. S10. Turn off the relevant functions of the corrosion temperature control and lubrication environment module. After the temperature inside the chamber drops to room temperature and the corrosive medium is discharged, disassemble and take out the cable sample. S11. Export test data and curves, calculate key parameters such as fatigue life, corrosion rate, and wear rate, and calculate each parameter 3 times and take the average value. S12. High-definition camera and scanning electron microscope were used to observe the damage and fracture morphology of the sample. The corrosion and fatigue coupling mechanism was analyzed by combining the electrochemical corrosion workstation. The influence of friction on cable damage was analyzed. S13. Adjust the test parameters such as the enclosure angle, cross angle, and fatigue load, and repeat S1-S12 to complete the test under different conditions.

[0017] In step S4, the tensile parameters include tensile load range, loading frequency, tensile displacement range, and acceleration / deceleration time; the torsion parameters include torsion angle, torsion speed, and torsion frequency; the bending parameter is the bending radius; the friction parameters include friction pair type and contact pressure; the environmental parameters include corrosive medium type, pH value, spray flow rate, spray interval, ambient temperature, and ambient humidity; and the test termination conditions include the number of cycles, the threshold for the number of broken wires, and sample breakage.

[0018] In step S5, tighten the clamping bolts when clamping the sample and adjust the clamping force to ensure that the sample is firmly clamped without damaging the sample surface.

[0019] In step S7, when starting the corrosion temperature control lubrication environment module, the corrosion medium spray and lubrication medium supply are simultaneously turned on to check the uniformity of spraying and lubrication and ensure that there is no leakage.

[0020] In step S8, the tension-torsion coupling drive module and the torsion drive module work together to simulate the tension-torsion coupling condition of the cable during the hoisting process of the ultra-deep vertical shaft. The corrosion temperature control lubrication environment module realizes alternating dry and wet corrosion, stable temperature control and precise lubrication.

[0021] In step S11, the key parameters also include the average value and range of friction coefficient, and the peak value of bending stress; when observing the damage of the sample, the wear area, corrosion depth, number of broken wires and length of broken wires are measured, and the crack origin, propagation path and fracture mechanism are analyzed.

[0022] In step S12, the operating parameters to be adjusted also include stretching speed, slip frequency, slip amplitude, and pH.

[0023] Beneficial effects: This invention achieves dynamic synergistic coupling of tensile, bending, and torsional composite loads. By coaxially arranging the tensile-torsional coupling drive module and the torsional drive module, and utilizing the coordinated control of a high-precision servo motor and an electric cylinder, dynamic tensile and torsional loads can be applied to cable samples synchronously or asynchronously. In conjunction with the friction bending fixture module arranged in the middle, the synchronous loading of tensile, bending, and torsional loads is realized, accurately simulating the real service mechanical state of ultra-deep vertical shaft cables.

[0024] This invention achieves comprehensive coupling of multiple physical fields including corrosion, temperature, lubrication, and humidity. It designs an integrated corrosion temperature control and lubrication environment module. Through a sealed environment chamber, corrosive medium circulation spray, and temperature and humidity adjustment components, it can not only simulate single environments such as acid / alkaline water spray, high humidity, and high temperature, but also realize complex working conditions such as alternating dry and wet conditions, temperature and humidity coupling, and the participation of lubricating media. It can explore the evolution law of cable damage under the mutual promotion of chemical corrosion, electrochemical oxidation, and mechanical wear.

[0025] This invention accurately simulates the complex multi-mode frictional contact behavior of cables. It designs replaceable friction pair components and an angle and position adjustable inclined support structure, which can simulate the "rope-rope" compression friction during the transition between cable layers, the "rope-groove" contact friction during rope entry / exit, and the "rope-plate" lateral friction during rope laying. At the same time, parameters such as bending radius and wrap angle can be adjusted to accurately reproduce the complex contact and slippage behavior of cables in ultra-deep vertical shaft hoisting systems.

[0026] A high-precision multi-parameter closed-loop control and real-time monitoring system was constructed. This invention integrates multiple high-precision sensors such as tension, torque, displacement, rotation angle, strain, temperature, and humidity. Combined with a high-speed data acquisition card and an industrial computer processing system, it realizes real-time monitoring, synchronous acquisition of multiple parameters, and closed-loop control of the entire process of cable tension, bending, torsion, friction, and corrosion tests. It solves the defects of traditional devices that rely on static loading or lack dynamic data analysis, and provides reliable and comprehensive data support for cable life prediction and safety assessment.

[0027] The device is highly versatile and easy to operate. The parameters of each module of this invention can be flexibly adjusted to adapt to cable samples of different specifications and materials. Different friction pairs and working condition parameters can be freely combined to meet diverse testing needs. The data processing module is equipped with dedicated visualization software, which supports one-click parameter setting, automatic data storage, real-time curve display and rapid report export, greatly reducing the difficulty of test operation and improving test efficiency. Attached Figure Description

[0028] Figure 1 Top view of the overall structure of the cable tension, bending, torsion, friction, corrosion, and fatigue testing device Figure 2 Overall structural test diagram of the cable tension, bending, torsion, friction, corrosion fatigue testing device Figure 3 Schematic diagram of the tension-torsion drive module and its location structure. Figure 4 Schematic diagram of the tension and torsion drive module Figure 5 Schematic diagram of the torsion drive module structure Figure 6 Schematic diagram of axial tension transmission assembly Figure 6 Schematic diagram of axial tension transmission assembly Figure 7 Schematic diagram of friction bending fixture installation Figure 8 Schematic diagram of the contact between the wire rope and the rope groove Figure 9 Schematic diagram of the contact between the wire rope and the baffle. Figure 10 Schematic diagram of wire rope contact. In the diagram, 1-base plate; 2-circulating temperature controller; 3-sealed environment chamber; 4-liquid storage tank; 5-cable; 6-slanted support plate; 7-spoke-type tension sensor I; 8-axial tension transmission assembly I; 9-tension and torsion support table; 10-coupling I; 11-servo torsion motor I; 12-fixed irregular-shaped guide plate; 13-servo electric cylinder; 14-servo torsion motor II; 15-coupling II; 16-axial tension transmission assembly II; 17-spoke-type tension sensor II; 18-circular fixed plate; 19-torsion support table; 20-Friction bending clamp; 21-Cable tension and torsion clamp; 22-Sliding plate; 23-Sliding guide rail; 24-Servo torsion motor I bracket; 25-Servo torsion motor II bracket; 26-Cable torsion clamp; 27-Rotating shaft; 28-Deep groove ball bearing; 29-Connecting block; 30-Bidirectional thrust ball bearing; 31-Axial tension transmission component protective cover; 32-Rope groove; 33-Baffle; 34-Double rope groove clamp; 35-Loading cable. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The specific embodiments described are only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figures 1-10 As shown, an ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device comprises a frame module, a tension and torsion coupling drive module, a torsion drive module, a corrosion temperature control and lubrication environment module, a friction bending fixture module, a data acquisition module, and a data processing module.

[0031] The frame module provides a rigid mounting foundation for the entire device, ensuring the stability of the testing apparatus and supporting the other functional modules. This includes the base plate 1, tensile and torsion support tables 9 and 19, and the inclined support plate 6. The base plate 1 is made of high-strength carbon steel with a thickness of not less than 20mm, preferably 6000mm×4000mm×20mm. Anchor bolt holes are located at the four corners and center of the lower surface, securing it to the ground with high-strength anchor bolts to prevent device displacement due to load impacts and high-frequency vibrations during testing. The upper surface is heat-treated, with a flatness error of no more than 0.02mm / m to prevent axial misalignment of modules after installation. The tensile and torsion support tables 9 and 19 are both vertically fixed to the base plate 1, centered, with their axes parallel to the upper surface of the base plate. The spacing can be adjusted within the range of 1000-3000mm according to the length of the cable sample. The inclined support plate 6 is tilted and fixed to one end of the base plate 1, with an inclination angle of 30°-60°. The frame module is adjustable within a certain range. It has an adjustable mounting base at the top for mounting the friction bending fixture 20 of the friction bending fixture module. The position of the mounting base can be adjusted to adapt to the simulation requirements of different bending radii. The inclined support plate 6 is reinforced at the connection with the base plate 1 to improve the load-bearing capacity to cope with the impact force brought by the bending load. All components of the frame module are treated with anti-corrosion and the surface is sprayed with anti-rust and wear-resistant coating to adapt to the corrosion of corrosive media in the test environment.

[0032] The tension-torsion coupling drive module is installed on the tension-torsion support table 9 to provide dynamic tensile and torsional loads to one end of the cable sample, simulating the tensile and torsional stress and fatigue load of the cable during the hoisting process of an ultra-deep vertical shaft. It mainly includes a servo electric cylinder I3, a servo torsion motor I11, a spoke-type tension sensor I, a sliding plate 22, a cable tension-torsion clamp, a sliding guide rail 23, a coupling I10, and an axial tension transmission assembly I8. The servo electric cylinder I3 uses a high-precision AC servo motor with a rated power of 15kW and a speed adjustment range of 0-3000r / m. The servo torsion motor I11 is equipped with forward and reverse rotation and acceleration / deceleration adjustment functions, which can simulate the acceleration and deceleration conditions during the start-up and braking of ultra-deep vertical shaft hoisting. Its output end is connected to the sliding plate 22, and the tensile load is dynamically applied through high-frequency reciprocating motion. The sliding plate 22 is connected to the sliding guide rail 23, and the sliding guide rail 23 is bolted to the tensile torsion support table 9 to ensure the smooth movement of the sliding plate. The servo torsion motor I11 is connected to the axial tension transmission component I8 through the coupling I10, and is also connected to the spoke-type tension sensor I7 to achieve precise application of torsional load on the cable sample. Both the servo torsion motor I11 and the axial tension transmission component I7 are bolted to the sliding plate 22. The axial tension transmission component I7 includes a two-way thrust ball bearing 30, a deep groove ball bearing 28, and a rotating shaft 27, which can prevent the servo torsion motor I11 from directly bearing the tensile load and extend the service life of the motor. The servo torsion motor I11 is connected to the base plate 1 through a flange.

[0033] The spoke-type tension sensor I7 is installed between the cable torsion clamp 26 and the axial tension transmission assembly I8. It has a range of 0-5t and an accuracy class of 0.1. It is used to collect the magnitude and rate of change of tensile load in real time. The signals from each sensor are transmitted to the data acquisition module through shielded cables. The outer layer is equipped with a sealed protective sleeve to prevent corrosive media from affecting the measurement accuracy. The displacement sensor is installed on the side of the sliding guide rail 23. It has a range of 0-500mm and an accuracy of 0.001mm. It realizes dual closed-loop control of tensile load and displacement. The loading frequency can be adjusted within the range of 0.1-10Hz. The servo electric cylinder 13 can work in conjunction with the servo torsion motor I11 to realize synchronous / asynchronous dynamic loading of tensile-torsion composite load, accurately simulating the tension-torsion coupling condition of the cable in actual service.

[0034] The corrosion temperature control and lubrication environment module is installed in the test section of the cable sample to simulate the multi-physical field coupling environment of water spray, high humidity, high temperature, corrosive media, and lubrication in the wellbore of ultra-deep vertical shafts. It solves the technical defects of insufficient physical field coupling dimension of existing devices and realizes the coordinated simulation of corrosion, temperature and humidity. The sealed environment chamber 3 is made of corrosion-resistant 316L stainless steel, with a rectangular structure, a length of 800-1200mm, a width of 500-800mm, and a height of 600-800mm. Cables are installed at both ends through elliptical through-holes, each fitted with a fluororubber sealing sleeve to accommodate cable samples of different diameters. It boasts advantages such as corrosion resistance, high temperature resistance, and excellent sealing performance, preventing leakage of corrosive media and heat loss. A transparent observation window made of tempered corrosion-resistant glass is located on the side for easy observation of cable damage during the test. A protective cover is installed outside the observation window, which can be opened after the test for sample inspection and equipment maintenance. A waste liquid collection tank is located at the bottom, with a drain valve at the bottom to collect corrosive waste liquid generated during the test. After treatment, the waste liquid is discharged to avoid environmental pollution.

[0035] The corrosive medium circulating spray assembly includes a storage tank (4 units), a micro metering pump, spray heads, and a flow control valve. The storage tank has a volume of 50L and is made of corrosion-resistant material. It is used to store acidic, alkaline, or neutral corrosive media to simulate wellbore water spraying. The pH value can be adjusted from 2 to 12. The tank is equipped with a stirrer and a level sensor. The stirrer ensures uniform concentration of the corrosive medium, and the level sensor monitors the medium level in real time. When the level is lower than the preset value, an alarm signal is issued. The micro metering pump has a rated flow rate of 0-5L / min and a flow adjustment accuracy of 0.1L / min. The inlet is connected to the storage tank, and the outlet is connected to the spray heads through a corrosion-resistant pipe. There are 4 spray heads, which are evenly installed on the top of the sealed environment chamber to evenly spray the corrosive medium onto the surface of the cable sample. The spray flow rate can be adjusted by the flow control valve, and the spray interval can be controlled within the range of 0-60s to achieve dry-wet alternating corrosion simulation, closely matching the real corrosion environment of ultra-deep vertical shaft cables.

[0036] The temperature control assembly includes a liquid conduit, a circulating temperature controller, temperature sensors, and a temperature controller. The liquid conduit is installed on both sides inside the sealed environment chamber 3. The circulating temperature controller, with a power of 1500W, is installed on the side of the sealed environment chamber 3 and is used to control the temperature inside the sealed environment chamber 3, achieving bidirectional temperature regulation. The temperature regulation range is -30℃ to 50℃, and the temperature control accuracy is ±1℃. It can simulate the temperature environment at different depths inside an ultra-deep vertical shaft. The temperature sensors are PT100 platinum resistance sensors, with no fewer than three sensors, which are respectively arranged at the upper, middle, and lower positions of the cable sample to collect the temperature inside the environment chamber in real time. The sensor signals are transmitted to the temperature controller, which uses PID closed-loop control to ensure the temperature stability inside the environment chamber.

[0037] The humidity control component includes an ultrasonic humidifier, a dehumidifier, and a humidity sensor. The humidity control range is 50%-95%RH, and the humidity control accuracy is ±5%RH. It can accurately simulate the high humidity environment inside an ultra-deep vertical shaft. The ultrasonic humidifier is installed on one side of the sealed environment box, with a humidification capacity of 0-3kg / h, to increase the humidity inside the sealed environment box 3. The dehumidifier is installed on the other side of the sealed environment box 3, with a dehumidification capacity of 0-2kg / h, to reduce the humidity inside the sealed environment box 3. The humidity sensor is installed inside the sealed environment box 3 to collect humidity data in real time and transmit it to the data acquisition module to achieve closed-loop humidity control.

[0038] The friction bending fixture module is installed inside the sealed environment chamber 3 and fixed on the mounting base of the inclined support plate 6. It is located in the test section where the cable sample is installed to simulate the frictional contact behavior and bending conditions of the cable with different friction pairs during the hoisting process of ultra-deep vertical shafts. It includes a friction bending fixture and replaceable friction pair components. The friction pair components include three replaceable friction pairs, which can accurately simulate three typical frictional contact scenarios of ultra-deep vertical shaft cables: Simulate the frictional contact between cable 5 and loading cable 35, cable 5 and rope groove 32, and cable 5 and baffle 33; Cable 5 - the base of loading cable 35, using a cable segment of the same material and specifications as the test sample, is fixed on the double-groove clamp 34, and is in contact with the test cable 5 sample in a bent parallel position. The cable 5-rope groove 32 contact is made of the same material and groove shape as the ultra-deep vertical shaft drum rope groove, and is fixed on the groove wall of the rubbing bending fixture 20, and is in close contact with the test cable 5 sample.

[0039] The cable 5 contacts the baffle 33, using a rectangular block of the same material as the roller side baffle, fixed to both sides of the bending fixture 20, and in contact with the side of the test cable sample.

[0040] The data acquisition module consists of various sensors, data acquisition cards, signal conditioners, and transmission modules. It is used to collect mechanical parameters, environmental parameters, and friction parameters in real time during the test, providing comprehensive and accurate data support for test analysis. The industrial control computer, signal conditioner, and multi-channel data acquisition card can collect parameters including tensile load (tension sensor), tensile displacement (displacement sensor), torsional load (torque sensor), torsional angle (torque sensor integrated), and bending stress (strain gauge). The strain gauges are BF120-3AA type, attached to the test section of the cable sample, with no fewer than four gauges arranged in different positions to collect bending stress at different locations. The strain gauges have an anti-corrosion sealing layer to prevent corrosive media from affecting measurement accuracy. The signal conditioner amplifies and filters the analog signals from various sensors, removing interference signals and improving signal quality. The data acquisition card is an NI USB-6363 type, with a sampling rate ≥10Hz and a sampling accuracy of 16 bits, capable of simultaneously acquiring no fewer than 32 analog signals, achieving multi-parameter synchronous acquisition. The transmission module uses Ethernet + 5G dual-mode transmission, enabling real-time data transmission with a transmission delay of no more than 100ms, and also has local data storage functionality to prevent data loss.

[0041] The data processing module is connected to the data acquisition module, various drive modules, and environmental modules. It is used to process, analyze, store, and display various types of test data in real time, realize real-time monitoring of the test process and accurate analysis of test results, and provide technical support for the study of cable damage evolution mechanism and life prediction. The industrial computer utilizes an Intel Core i7 processor, 16GB of RAM, and a 1TB solid-state drive, possessing strong data processing and storage capabilities. It can store at least 100 sets of complete experimental data, supporting multiple data formats such as Excel, Txt, and CSV for easy data export and analysis. The data processing software, developed based on LabVIEW 2023 and Matlab R2023, can receive various parameters transmitted from the data acquisition module in real time, displaying parameter values ​​and curves intuitively on the display unit. It can simultaneously display at least eight parameter curves, supporting zooming, overlay, and comparison for easy observation of parameter change patterns. It features data storage and export functions, automatically storing all data during the experiment with an adjustable storage interval of 0.1-10 seconds. After the experiment, all data and curves can be exported with a single click, supporting export to Excel, Word, PDF, and other formats for easy report writing. It also includes a data backup function, allowing data to be backed up to a USB flash drive, external hard drive, or cloud storage to prevent data loss. The display unit uses a 27-inch screen. The 1920×1080 high-definition industrial display screen is clear, responsive, and supports touch operation, making it easy for test personnel to operate and monitor the test status. The alarm unit can issue alarm signals when test parameters exceed the preset range, the device operates abnormally, or the medium level is too low, so as to promptly remind test personnel to handle the situation and ensure test safety.

[0042] Furthermore, the installation and coordination relationships of each module are as follows: the tensile-torsion coupling drive module and the torsion drive module are arranged on the corresponding support table of the frame module; the friction bending fixture module is installed on the inclined support plate, located between the two drive modules; the sealed environment chamber 3 is fitted onto the test section of the cable sample, covering the core area of ​​the friction bending fixture module, and its bottom is fixed to the inclined support plate 6. Various sensors of the data acquisition module are installed on each functional module and connected to the data acquisition card via shielded cables. The data acquisition card is connected to the industrial computer of the data processing module. The tensile-torsion coupling drive module, the torsion drive module, and the corrosion temperature control lubrication environment module are all connected to the data processing module, receiving control commands from the data processing module to achieve synchronous control of test parameters. The connections between each module are designed to be corrosion-resistant and interference-resistant to ensure the stability and reliability of the test process.

[0043] The data processing module consists of an industrial computer, data processing software, a display unit, and an alarm unit.

[0044] Based on the above-mentioned testing device, the present invention also provides a method for testing the tensile, bending, torsional, frictional corrosion fatigue of hoisting cables in ultra-deep vertical shafts.

[0045] The experimental procedure is as follows: S1. Select cable 5, which is consistent with the actual use of the ultra-deep vertical shaft hoisting system, as the test specimen. The length of the cable specimen is determined according to the clamping distance of the test device, preferably 1500-2500mm, and the diameter of the cable specimen is 6-30mm. The cable specimen is pretreated to remove oil, oxide layer and floating rust from the surface of the specimen. The surface is polished with sandpaper until it is smooth. After polishing, it is wiped clean with anhydrous ethanol and dried for later use. S2. Check the connection status of each module of the test device to ensure that each component is firmly connected and not loose, and that the sealed environment chamber has good sealing performance and no leakage; calibrate each sensor using standard weights, standard torque meters and other calibration tools to ensure that the sensor measurement accuracy meets the requirements (error not greater than ±1%), and record the calibration data after calibration. S3. Check the operating status of the tension and torsion drive module and the torsion drive module. Run them under no-load for 5-10 minutes and observe the operation of components such as servo electric cylinder 13, servo torsion motor I11, servo torsion motor II14, and sliding guide rail 23 to ensure that there is no abnormal noise, no jamming, and stable operation. Check the medium supply and temperature regulation of the corrosion temperature control environment module. Run it under no-load for 3-5 minutes to ensure that the corrosion medium is sprayed evenly and the temperature regulation is stable. S4. Set tensile parameters (tensile load range, loading frequency, tensile displacement range, acceleration and deceleration time), torsion parameters (torsion angle, torsion speed, torsion frequency), bending parameters (bending radius), friction parameters (friction pair type, contact pressure), environmental parameters (corrosive medium type, pH value, spray flow rate, spray interval, ambient temperature, ambient humidity), and test termination conditions (number of cycles, wire breakage threshold, specimen breakage). S5. Clamp one end of the pretreated cable 5 sample onto the cable tension torsion clamp 21 of the tension drive module. Adjust the clamp position to ensure that the sample axis coincides with the axis of the tension torsion drive module. Tighten the clamping bolts and adjust the clamping force to ensure that the clamping is firm and does not damage the sample surface. Pass the other end of the cable 5 sample through the fluororubber sealing sleeves at both ends of the sealed environment box 3, through the friction bending clamp and friction pair of the friction bending clamp module, and clamp it onto the cable torsion clamp of the torsion drive module. Adjust the position of the cable torsion clamp to ensure that the cable 5 sample axis coincides with the axis of the torsion drive module and is coaxially aligned with the tension drive module (coaxiality deviation not greater than 1°). Tighten the clamping bolts to complete the sample installation.

[0046] S6. Adjust the bending radius of the friction bending fixture module, move the inclined support plate 6 back and forth, and tighten the locking bolts of the inclined support plate 6 after adjustment according to the preset bending radius value; install the corresponding friction pair, adjust the position of the friction pair so that it is in close contact with the cable 5 sample, and adjust the contact pressure by adjusting the bolts until the preset value is reached; adjust the position of the sealed environment box 3 to ensure that the test section of the cable 5 sample is completely inside the environment box, and the core area of ​​the friction bending fixture module is covered by the environment box; tighten the fixing bolts at the bottom of the sealed environment box 3 and close the protective cover of the observation window.

[0047] S7. Start the data acquisition module and data processing module to ensure normal data acquisition and clear display; start the tensile drive module to apply a pre-tensile load to the cable sample, setting the pre-tensile load to 0.2 times the nominal breaking tensile force, maintain the preload state for 5 minutes, check the clamping state of the cable torsion clamp to ensure no slippage or loosening, and check the sensor data to ensure the data is stable and accurate; start the torsion drive module to apply a pre-torsion load to cable sample 5, setting the pre-torsion angle to 10% of the preset torsion angle, maintain the preload state for 3 minutes, check the clamping state of the cable torsion clamp 26, and check the torque sensor data to ensure the data is stable and accurate; start the corrosion temperature control and lubrication environment module, adjust the ambient temperature to the preset value, turn on the corrosive medium spray and lubrication medium supply, run for 3-5 minutes, and check whether the environmental parameters are stable, whether the spray and lubrication are uniform, and whether there is any leakage.

[0048] S8. The test start command is issued through the software of the data processing module to start the entire test device and begin the formal test: The tensile drive module and the torsion drive module apply tensile-torsion composite loads in concert according to preset parameters to simulate the tensile-torsion coupling condition of the cable during the hoisting of ultra-deep vertical shafts and realize dynamic coordinated loading; The friction bending fixture module maintains the preset bending radius and friction contact pressure to simulate the bending and friction conditions of the cable; The corrosion temperature control environment module provides a multi-physical field coupling environment of corrosion, temperature and humidity according to preset parameters to realize alternating dry and wet corrosion, stable temperature control and precise lubrication; The data acquisition module collects various test parameters in real time, including mechanical parameters, environmental parameters and friction parameters, and transmits them to the data processing module through the transmission module; The data processing module processes and analyzes the collected data in real time, plots the change curves of various parameters, displays the test status in real time, and automatically stores the test data.

[0049] S9. When the test reaches the preset termination condition (the number of cycles reaches the set value), the data processing module automatically issues a test termination command, the test device stops running, the data acquisition module stops collecting data, the data processing module automatically saves all test data and curves, generates a test termination report, and records the test termination time.

[0050] S10. After the test is terminated, turn off the media supply, heating and cooling functions of the corrosion temperature control environment module. After the temperature in the sealed environment box drops to room temperature and the corrosive medium is completely discharged, open the protective cover and observation window of the environment box, loosen the clamping bolts of the cable tension torsion clamp 21 and the cable torsion clamp 26, disassemble the cable 5 sample, and take the sample out of the device. S11. Export all test data and curves through the data processing module software, organize and analyze the exported data, and calculate key parameters such as fatigue life, corrosion rate, wear rate, average friction coefficient and variation range, and peak bending stress of cable 5 specimen. Each parameter is calculated 3 times, and the average value is taken as the test result. S12. High-definition camera was used to photograph the damage (wear, corrosion, and broken wires) on the surface of cable sample 5, and the wear area, corrosion depth, number of broken wires, and length of broken wires were measured. Scanning electron microscope (SEM) was used to observe the fracture morphology of the sample and analyze the crack origin, propagation path, and fracture mechanism. Combined with electrochemical corrosion workstation, the coupling mechanism of corrosion and fatigue was analyzed. Combined with friction parameter data, the influence of friction on cable damage was analyzed.

[0051] S13. Adjust different wrap angles, wire rope crossing angles, fatigue loads, contact loads, tensile speeds, slippage frequencies, slippage amplitudes, temperatures, and pH levels, and repeat S1-S11 to complete the test under different working conditions.

[0052] Although embodiments of the invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the fatigue of the bending-torsion friction corrosion of a super-deep vertical shaft hoisting cable, characterized in that, It includes a frame module, a tension-torsion coupling drive module, a torsion drive module, a corrosion-temperature-controlled lubrication environment module, a friction-bending fixture module, a data acquisition module, and a data processing module; The frame module provides a rigid mounting foundation for the entire device, including a base plate, a tension-torsion support table, a torsion support table, and an inclined support plate, wherein the tension-torsion support table, torsion support table, and inclined support plate are arranged in a triangular pattern; the tension-torsion coupling drive module is mounted on the tension-torsion support table; the torsion drive module is mounted on the torsion support table; the friction bending fixture module is mounted on the inclined support plate; the tension-torsion coupling drive module, the torsion drive module, and the friction bending fixture module are connected in series by cables; The corrosion temperature-controlled lubrication environment module includes a sealed environment box, a temperature control component, and a corrosive medium circulation spray component; the sealed environment box is fixed on an inclined support plate, and the friction bending fixture module is located inside the cavity of the sealed environment box; the temperature control component is used to control the temperature inside the sealed environment box to achieve bidirectional temperature regulation; the corrosive medium circulation spray component is used to simulate the wellbore water spraying environment; The data acquisition module is connected to the tensile torsion coupling drive module, the torsion drive module, the corrosion temperature control lubrication environment module, and the friction bending fixture module, respectively, to collect mechanical, environmental, and frictional parameters in real time during the test. The data processing module receives signals from the data acquisition module to realize synchronous control of test parameters, real-time data processing and analysis, and test status monitoring.

2. The ultra-deep vertical shaft hoisting cable LCF test apparatus according to claim 1, wherein, The base plate has linearly and evenly distributed bolt holes, and the base plate of the inclined support plate has mounting holes that match the bolt holes.

3. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 1, characterized in that, The tension-torsion coupling drive module includes a servo electric cylinder, a servo torsion motor I, a spoke-type tension sensor I, a sliding plate, a cable tension-torsion clamp, a sliding guide rail, a coupling I, and an axial tension transmission assembly I. The servo electric cylinder I is fixed on the base plate, the servo torsion motor I and the axial tension transmission assembly I are coaxially mounted on the sliding plate, the output end of the servo electric cylinder I is connected to the sliding plate, and the sliding plate is mounted on the sliding guide rail and can slide back and forth along the sliding guide rail. The servo torsion motor I is connected to the axial tension transmission assembly I via a coupling I. The spoke-type tension sensor I is installed between the axial tension transmission assembly I and the cable tension torsion clamp. The axial tension transmission assembly I includes a bidirectional thrust ball bearing and a deep groove ball bearing sequentially mounted on a rotating shaft.

4. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 3, characterized in that, The torsion drive module includes a servo torsion motor II, a spoke-type tension sensor II, a coupling II, an axial tension transmission assembly II, and a cable torsion clamp. The servo torsion motor II drives the cable to rotate around its axis through the axial tension transmission assembly II. The servo torsion motor II is connected to the axial tension transmission assembly II through the coupling II. The spoke-type tension sensor II is installed between the axial tension transmission assembly II and the cable torsion clamp. The axial tension transmission assembly II includes a bidirectional thrust ball bearing and a deep groove ball bearing sequentially mounted on the rotating shaft.

5. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 1, characterized in that, The sealed environment chamber has elliptical through holes on both sides, a tempered anti-corrosion glass transparent observation window and a protective cover on the side, and a waste liquid collection tank and a drain valve at the bottom; the edges of the through holes are equipped with fluororubber sealing sleeves.

6. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 1, characterized in that, The corrosion temperature control lubrication environment module also includes a humidity regulation component, including an ultrasonic humidifier, a dehumidifier, and a humidity sensor. The ultrasonic humidifier is installed on one side of the sealed environment box, the dehumidifier is installed on the other side of the sealed environment box, and the humidity sensor is installed inside the sealed environment box.

7. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 1, characterized in that, The friction bending fixture module includes a friction bending fixture and a replaceable friction pair assembly, the replaceable friction pair assembly being mounted on the friction bending fixture; the friction bending fixture includes a single-groove fixture and a double-groove fixture.

8. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 1, characterized in that, The temperature control component includes a liquid conduit, a circulating temperature controller, and a temperature sensor. The liquid conduit is installed on both sides inside the sealed environment chamber. The circulating temperature controller is installed on the bottom plate outside the environment chamber. The temperature sensor is installed on the inner wall of the sealed environment chamber.

9. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 1, characterized in that, The corrosive medium circulating spray assembly includes a storage tank, a micro metering pump, a spray head, a flow regulating valve, a stirrer, and a level sensor. The storage tank is mounted on a base plate, and the spray head is mounted in a sealed environment chamber. The micro metering pump and the flow regulating valve are connected in series between the storage tank and the sealed environment chamber. The stirrer and the level sensor are mounted inside the storage tank.

10. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 4, characterized in that, The data acquisition module includes an industrial control computer, a signal conditioner, a multi-channel data acquisition card, a displacement sensor, a torque sensor, and a bending stress sensor. The industrial control computer is mounted on a base plate, and the signal conditioner and the multi-channel data acquisition card are connected in series on the industrial control computer. The displacement sensor, torque sensor, and bending stress sensor are respectively connected to the multi-channel data acquisition card. The displacement sensor is mounted on the servo electric cylinder. The torque sensor is mounted on the output terminals of servo torsion motor I and servo torsion motor II. The bending stress sensor is mounted on the surface of the bending section of the cable.

11. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 1, characterized in that, The data processing module includes an industrial computer, a display unit, and an alarm unit; the display unit is a high-definition industrial display and is connected to the industrial computer; the alarm unit includes a buzzer and an alarm light, which are respectively connected to the industrial computer.

12. A method for testing the tensile, bending, torsional, frictional, and corrosion fatigue of hoisting cables in ultra-deep vertical shafts, characterized in that... S1. Select a cable that is consistent with the actual use as a sample. The sample length is 1500-2500mm and the diameter is 6-30mm. Pre-treat the sample: remove surface oil, oxide layer and floating rust, sand it smooth with sandpaper, wipe it with anhydrous ethanol, and let it dry for later use. S2. Check the connection status of each module of the device to ensure that there is no leakage in the sealed environment box. Use standard weights and standard torque meter to calibrate each sensor to ensure that the measurement error is no greater than ±1%, and record the calibration data. S3. Run the tension and torsion coupling drive module and torsion drive module under no-load for 5-10 minutes, and run the corrosion temperature control lubrication environment module under no-load for 3-5 minutes to check the operation of each component and the status of media spraying and temperature regulation. S4. Set the tensile, torsion, bending, friction, environmental parameters and test termination conditions through the data processing module; S5. Clamp one end of the pretreated sample in the cable tension and torsion fixture of the tension and torsion coupling drive module, and clamp the other end through the sealing sleeve of the sealed environment box and the friction bending fixture in the cable torsion fixture of the torsion drive module to ensure that the sample axis is coaxial and aligned with the axes of the two drive modules, and the coaxiality deviation is not greater than 1°. S6. Adjust and fix the bending radius of the friction bending fixture, install the preset friction pair and adjust the contact pressure to the preset value, adjust the position of the sealed environment box so that the test section of the sample is completely inside the box and fix it. S7. Start the data acquisition module and data processing module, apply pre-tension load and pre-torsion load to the sample. The pre-tension load is 0.2 times the nominal breaking tensile force and is held for 5 minutes. The pre-torsion angle is 10% of the preset torsion angle and is held for 3 minutes. Start the corrosion temperature control and lubrication environment module, adjust it to the preset parameters and run it for 3-5 minutes. Check the stability of each parameter. S8. Issue the test start command. Each module works according to the preset parameters to realize dynamic collaborative loading of tension and torsion composite load, bending friction simulation and multi-physics field coupling environment simulation. The data acquisition module collects parameters in real time and transmits them to the data processing module. The data processing module processes and analyzes, plots curves and stores data in real time. S9. When the test reaches the preset termination condition, a termination command is automatically issued, the device stops running, the data processing module saves all data and curves and generates a test termination report. S10. Turn off the relevant functions of the corrosion temperature control and lubrication environment module. After the temperature inside the chamber drops to room temperature and the corrosive medium is discharged, disassemble and take out the cable sample. S11. Export test data and curves, calculate key parameters such as fatigue life, corrosion rate, and wear rate, and calculate each parameter 3 times and take the average value. S12. High-definition camera and scanning electron microscope were used to observe the damage and fracture morphology of the sample. The corrosion and fatigue coupling mechanism was analyzed by combining the electrochemical corrosion workstation. The influence of friction on cable damage was analyzed. S13. Adjust the test parameters such as the enclosure angle, cross angle, and fatigue load, and repeat S1-S12 to complete the test under different conditions.

13. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 12, characterized in that, In step S4, the tensile parameters include tensile load range, loading frequency, tensile displacement range, and acceleration / deceleration time; the torsion parameters include torsion angle, torsion speed, and torsion frequency; the bending parameter is the bending radius; the friction parameters include friction pair type and contact pressure; the environmental parameters include corrosive medium type, pH value, spray flow rate, spray interval, ambient temperature, and ambient humidity; and the test termination conditions include the number of cycles, the threshold for the number of broken wires, and sample breakage.

14. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 12, characterized in that, In step S5, tighten the clamping bolts when clamping the sample and adjust the clamping force to ensure that the sample is firmly clamped without damaging the sample surface.

15. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 12, characterized in that, In step S7, when starting the corrosion temperature control lubrication environment module, the corrosion medium spray and lubrication medium supply are simultaneously turned on to check the uniformity of spraying and lubrication and ensure that there is no leakage.

16. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 12, characterized in that, In step S8, the tension-torsion coupling drive module and the torsion drive module work together to simulate the tension-torsion coupling condition of the cable during the hoisting process of the ultra-deep vertical shaft. The corrosion temperature control lubrication environment module realizes alternating dry and wet corrosion, stable temperature control and precise lubrication.

17. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 12, characterized in that, In step S11, the key parameters also include the average value and range of friction coefficient, and the peak value of bending stress; when observing the damage of the sample, the wear area, corrosion depth, number of broken wires and length of broken wires are measured, and the crack origin, propagation path and fracture mechanism are analyzed.

18. The ultra-deep vertical shaft hoisting cable tension, bending, torsion, friction, corrosion fatigue testing device according to claim 12, characterized in that, In step S12, the operating parameters to be adjusted also include stretching speed, slip frequency, slip amplitude, and pH.

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