Device and method for detecting decoupling of current-carrying friction coupling damage based on in-situ cooling

Abstract

This invention discloses a device and method for decoupling and detecting current-carrying frictional coupling damage based on in-situ cooling, relating to the technical field of friction and wear testing devices. The device includes: a rolling current-carrying friction and wear performance testing device body, a cooling device, and a temperature detection device. The rolling current-carrying friction and wear performance testing device body includes an active rotating wheel, a driven rotating wheel, and an electrical contact. The electrical contact is tactilely connected between the active and driven rotating wheels. The rotation of the active wheel drives the electrical contact and the driven rotating wheel to rotate. The active wheel, electrical contact, and driven rotating wheel, together with a power supply, form a rolling frictional current-carrying circuit. The cooling device performs in-situ cooling at the contact points between the electrical contact and the active and driven rotating wheels. The temperature measurement device measures the temperature at the contact points between the electrical contact and the active and driven rotating wheels. The device has a simple structure, is easy to use, and can effectively determine the dominant mechanism of rolling current-carrying frictional coupling damage under different operating conditions.

Description

Technical Field

[0001] This invention relates to the field of friction and wear testing equipment, and in particular to a device and method for decoupling and detecting current-carrying frictional coupling damage based on in-situ cooling. Background Technology

[0002] In the application of rolling slip rings, rolling current-carrying friction suffers from three major problems: mechanical wear, thermal wear, and arc wear. The core technologies of high-power, long-life, and high-reliability slip rings severely restrict the development of high-end weaponry and major aerospace engineering projects in my country. The fundamental problem behind this key technology is the damage mechanism of current-carrying friction. However, a typical structural feature of current-carrying friction is that the friction surface and the current-carrying surface are coplanar, leading to three interacting thermal effects at the interface: frictional heat, contact resistance heat, and arc heat. This results in multi-field coupling effects such as stress concentration, current density concentration, and heat flux density concentration. These energy fields undergo complex physical processes such as accumulation, transmission, transformation, absorption, and divergence at the current-carrying friction interface, leading to multi-scale physical and chemical reactions such as the transfer, transformation, and change of interface materials. This involves a composite damage process involving mechanical wear caused by frictional heat, electrical wear caused by contact resistance heat and arcing, and the strong coupling between them. Because the various key control variables affecting damage are intertwined, current experimental techniques based on single-control-variable methods to study composite damage of current-carrying friction face significant challenges, as it is difficult to decouple the contribution ratios of electrical and thermal factors to composite damage. Elucidating the mechanism and proportion of the combined damage caused by electric and thermal energy fields to current-carrying friction can provide a theoretical basis for the structural design, material selection, and process optimization of high-end collector rings.

[0003] However, there is currently a lack of effective devices and methods to determine which of these three wear mechanisms is dominant, which brings difficulties to the design of high-end slip ring structures, material selection, and process optimization. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for decoupling and detecting current-carrying frictional coupling damage based on in-situ cooling, so as to solve the problems existing in the prior art. It has a simple structure, is easy to use, and can effectively determine the dominant mechanism of rolling current-carrying frictional coupling damage under different working conditions.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a current-carrying frictional coupling damage decoupling detection device based on in-situ cooling, comprising: a rolling current-carrying frictional wear performance testing device body, a cooling device, and a temperature detection device. The rolling current-carrying frictional wear performance testing device body includes an active rotating wheel, a driven rotating wheel, and an electrical contact element. The electrical contact element is rotatably connected between the active rotating wheel and the driven rotating wheel. The rotation of the active wheel can drive the electrical contact element and the driven rotating wheel to rotate, and the active rotating wheel, the electrical contact element, and the driven rotating wheel, when combined with a power supply, can form a rolling frictional current-carrying circuit. The cooling device is used to perform in-situ cooling at the contact points between the electrical contact element and the active rotating wheel and the driven rotating wheel, respectively. The temperature measurement device is used to measure the temperature at the contact points between the electrical contact element and the active rotating wheel and the driven rotating wheel.

[0007] Preferably, it also includes a temperature controller, which is signal-connected to the temperature detection device to receive the temperature signal measured by the temperature detection device, and is able to control the cooling device to cool the position where the electrical contact is in contact with the driving wheel and the driven wheel to the design temperature.

[0008] Preferably, the cooling device includes a compressed air source, a first nozzle, a first nozzle, a second nozzle, and a second nozzle. The compressed air source is fixedly connected to the body of the rolling current friction and wear performance testing device. One end of the first nozzle is connected and communicates with the compressed air source, and the other end is connected and communicates with the first nozzle. The first nozzle is used to aim at the position where the electric contact element contacts the active rotating wheel to blow the gas supplied by the compressed air source towards the position where the electric contact element contacts the active rotating wheel and perform in-situ cooling. The second nozzle is used to aim at the position where the electric contact element contacts the driven rotating wheel to blow the gas supplied by the compressed air source towards the position where the electric contact element contacts the driven rotating wheel and perform in-situ cooling.

[0009] Preferably, it also includes a nozzle manifold and a pressure regulating valve. One end of the nozzle manifold is used to connect and communicate with the first nozzle and the second nozzle, and the other end is used to connect and communicate with the pressure regulating valve. The end of the pressure regulating valve away from the nozzle manifold is used to connect and communicate with the compressed air source.

[0010] Preferably, the device further includes a first bracket and a second bracket, wherein the bottom of the first bracket is fixedly connected to the body of the rolling current friction and wear performance testing device, the top of the first bracket is detachably fixedly connected to the first nozzle, the bottom of the second bracket is fixedly connected to the body of the rolling current friction and wear performance testing device, and the top of the second bracket is detachably fixedly connected to the second nozzle.

[0011] Preferably, both the first nozzle and the second nozzle are serpentine cooling pipes.

[0012] Preferably, the temperature detection device includes a thermal imaging camera, which is positioned above the electrical contact and aligned with the position where the electrical contact contacts the driving and driven wheels to monitor the temperature changes in that area in real time.

[0013] Preferably, the temperature detection device further includes a thermocouple, which is fixedly connected to the body of the rolling current-carrying friction and wear performance testing device and is positioned at the contact point between the electrical contact element and the driving wheel and the driven wheel for temperature measurement.

[0014] This invention also provides a detection method for a current-carrying frictional coupling damage decoupling detection device based on in-situ cooling as described in any of the preceding claims, characterized by comprising the following steps:

[0015] S1: Turn on the power and run the rolling current friction and wear performance test device body under any current parameter. Record the evolution of temperature, friction torque and wear amount over time during the rolling current friction process of any electrical contact, and form the first friction torque evolution curve and wear amount evolution curve.

[0016] S2: Turn on the power, start the cooling device, run the rolling friction and wear performance testing device, set the same load and speed conditions as S1, adjust the cooling device to bring the temperature at the contact position between the electrical contact and the driving and driven wheels to room temperature, record the evolution of friction torque and wear amount over time in the rolling current-carrying friction process of the electrical contact with the same specifications as S1; form the second friction torque evolution curve and wear amount evolution curve;

[0017] S3: Under normal temperature conditions, turn off the power and the cooling device, run the rolling friction and wear performance testing device, set the same load and speed conditions as in S1, and record the evolution of friction torque and wear amount over time in the rolling current-carrying friction process of the same specification electrical contact parts as in S1; form the third friction torque evolution curve and wear amount evolution curve.

[0018] S4: Compare and analyze the evolution curves of the second friction torque and wear amount with the first friction torque and wear amount. Subtract the two to form the fourth friction torque and wear amount evolution curve. The fourth friction torque and wear amount evolution curve represents the effect of pure thermal effect-induced current-carrying friction damage on current-carrying friction and wear performance. The difference between the second and third friction torque and wear amount evolution curves represents the effect of pure current-induced current-carrying friction damage on current-carrying friction and wear performance.

[0019] By comparing and analyzing the evolution curves of the third frictional torque with the wear amount, the fourth frictional torque with the wear amount, and the fifth frictional torque with the wear amount, the dominant mechanism of rolling current frictional coupling damage was determined.

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] This invention provides a device and method for decoupling and detecting current-carrying frictional coupling damage based on in-situ cooling. By adding a cooling device and a temperature detection device to the main body of the rolling current-carrying frictional wear performance testing device, the following curves are obtained: a first frictional torque evolution curve and a wear amount evolution curve under normal energization; a second frictional torque evolution curve and a wear amount evolution curve under energization and cooling; and a third frictional torque evolution curve and a wear amount evolution curve during room-temperature mechanical wear. Combining the data from these three processes, the proportions of the three damage types—mechanical wear, wear induced by pure heat effect, and wear induced by pure current—in current-carrying frictional coupling damage are further analyzed, thereby determining the dominant mechanism of current-carrying frictional coupling damage. The device has a reasonable structure, is easy to operate, and can accurately record and analyze various data, providing basic data and testing methods for material selection, structural design, process and performance optimization of electrical contacts. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the current-carrying frictional coupling damage decoupling detection device based on in-situ cooling provided by the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] In the figure: 1. Rolling current friction and wear performance testing device body; 2. Active rotating wheel; 3. Driven rotating wheel; 4. Electrical contact; 5. Compressed air source; 6. First nozzle; 7. First nozzle; 8. Pressure regulating valve; 9. First support; 10. Nozzle main pipe; 11. Thermal imaging camera. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The purpose of this invention is to provide a device and method for decoupling and detecting current-carrying frictional coupling damage based on in-situ cooling, so as to solve the problems existing in the prior art. It has a simple structure, is easy to use, and can effectively determine the dominant mechanism of rolling current-carrying frictional coupling damage under different working conditions.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] This invention provides a current-carrying frictional coupling damage decoupling detection device based on in-situ cooling, such as... Figures 1-2As shown, the device includes: a rolling current-carrying friction and wear performance testing device body 1, a cooling device, and a temperature detection device. The rolling current-carrying friction and wear performance testing device body 1 includes a driving wheel 2, a driven wheel 3, and an electrical contact 4. The electrical contact 4 is slidably connected between the driving wheel 2 and the driven wheel 3. The rotation of the driving wheel can drive the electrical contact 4 and the driven wheel 3 to rotate. The driving wheel 2, the electrical contact 4, and the driven wheel 3, when combined with a power supply, can form a rolling friction current-carrying circuit. The rolling friction current-carrying circuit is as follows: positive terminal of the power supply, driving wheel 2, electrical contact 4, driven wheel 3, and... The moving wheel 3 and the negative terminal of the power supply, or the rolling friction current-carrying circuit, are: positive terminal of the power supply, driven wheel 3, electrical contact 4, driving wheel 2, and negative terminal of the power supply. The current lines twist and accumulate at the contact points between the electrical contact 4 and the two wheels, forming contact resistance and generating contact resistance heat. This induces current density concentration, heat flux density concentration, and stress concentration at the contact points, leading to strong coupling damage during the current-carrying friction process of the electrical contact 4. A cooling device is used to perform in-situ cooling at the contact points between the electrical contact 4 and the driving wheel 2 and driven wheel 3, respectively. A temperature measuring device is used to... Temperature measurements are taken at the contact points between the electrical contact 4 and the active and driven rollers 2 and 3. The interaction of the active roller 2, driven roller 3, and electrical contact 4 simulates rolling current-carrying friction in practical applications, providing a reliable experimental basis for studying the dominant mechanism of current-carrying friction wear. By adding a cooling device and a temperature detection device to the main body 1 of the rolling current-carrying friction wear performance testing device, the first friction torque evolution curve and wear amount evolution curve are obtained under normal energization, and the second friction torque evolution curve and wear amount evolution curve are obtained under energization and cooling. This provides a means to determine the role of wear induced by pure heat effect in composite wear. The third friction torque evolution curve and wear amount evolution curve are obtained during the room temperature mechanical wear process. Combining the data from the above three processes, the wear induced by pure heat effect and mechanical wear are further analyzed, thereby determining the dominant mechanism among the three types of composite wear: mechanical wear, wear induced by pure heat effect, and wear induced by pure current. The device has a reasonable structure, is easy to operate, and can accurately record and analyze various data, providing strong support for the performance optimization of electrical contact 4.

[0030] In a preferred embodiment, the in-situ cooling-based current-carrying frictional coupling damage decoupling detection device further includes a temperature controller. The temperature controller is signal-connected to the temperature detection device to receive the temperature signal measured by the temperature detection device, and can control the cooling device to cool the position where the electrical contact 4 contacts the active rotor 2 and the driven rotor 3 to the design temperature, thereby achieving precise control of the cooling process, ensuring that the experiment is carried out under the set temperature conditions, and improving the accuracy and repeatability of the experiment.

[0031] In a preferred embodiment, the cooling device includes a compressed air source 5, a first nozzle 6, a first nozzle 7, a second nozzle, and a second nozzle. The compressed air source 5 is fixedly connected to the body 1 of the rolling current friction and wear performance testing device. One end of the first nozzle 6 is connected and communicated with the compressed air source 5, and the other end is connected and communicated with the first nozzle 7. The first nozzle 7 is used to blow the gas delivered by the compressed air source 5 to the position where the electric contact 4 contacts the active rotating wheel 2 and perform in-situ cooling. The second nozzle is used to blow the gas delivered by the compressed air source 5 to the position where the electric contact 4 contacts the driven rotating wheel 3 and perform in-situ cooling. By using the combination of the compressed air source 5 and the nozzle, precise cooling of a specific position can be achieved, improving the cooling effect and efficiency. Preferably, the compressed air source 5 is an air compressor.

[0032] In a preferred embodiment, the cooling device further includes a nozzle manifold and a pressure regulating valve 8. One end of the nozzle manifold is used to connect and communicate with the first nozzle 6 and the second nozzle, and the other end is used to connect and communicate with the pressure regulating valve 8. The end of the pressure regulating valve 8 away from the nozzle manifold is used to connect and communicate with the compressed gas source 5. The pressure regulating valve 8 can adjust the gas pressure, thereby controlling the intensity of cooling and meeting different experimental requirements.

[0033] In a preferred embodiment, the cooling device further includes a first bracket 9 and a second bracket. The bottom of the first bracket 9 is fixedly connected to the body 1 of the rolling current friction and wear performance testing device, and the top of the first bracket 9 is detachably fixedly connected to the first nozzle 6. The bottom of the second bracket is fixedly connected to the body 1 of the rolling current friction and wear performance testing device, and the top of the second bracket is detachably fixedly connected to the second nozzle. The bracket arrangement makes the position of the nozzle more stable.

[0034] In a preferred embodiment, both the first nozzle 6 and the second nozzle are serpentine cooling pipes. The adjustable angle of the serpentine cooling pipes allows for optimized arrangement according to actual conditions, improving the flexibility and adaptability of the device and enhancing the targeting and effectiveness of cooling.

[0035] In a preferred embodiment, the temperature detection device includes a thermal imaging camera 11, which is positioned above the electrical contact 4 and aligned with the position where the electrical contact 4 contacts the driving wheel 2 and the driven wheel 3 to monitor the temperature change in that area in real time. The thermal imaging camera 11 can visually display the temperature distribution of the contact area and monitor temperature changes in real time, providing more accurate data for experimental analysis.

[0036] In a preferred embodiment, the temperature detection device further includes a thermocouple, which is fixedly connected to the body 1 of the rolling current friction and wear performance testing device and is positioned at the contact point between the electrical contact 4 and the active rotating wheel 2 and the driven rotating wheel 3 for temperature measurement. The thermocouple can provide accurate temperature measurement values, complementing the thermal imaging camera 11 and improving the accuracy and reliability of temperature detection.

[0037] Example 2

[0038] This embodiment also provides a detection method for a current-carrying friction coupling damage decoupling detection device based on in-situ cooling as described in any of Embodiment 1, comprising the following steps:

[0039] S1: Turn on the power and run the rolling current friction and wear performance test device body 1 under any current parameter. Record the evolution of temperature, friction torque and wear amount over time during the rolling current friction process of any electrical contact 4, and form the first friction torque evolution curve and wear amount evolution curve.

[0040] S2: Turn on the power, start the cooling device, run the rolling friction and wear performance testing device, set the same load and speed conditions as in S1, adjust the cooling device to bring the temperature at the contact position of the electrical contact 4 with the driving wheel 2 and the driven wheel 3 to room temperature, record the evolution of the friction torque and wear amount over time of the electrical contact 4 of the same specification as in S1 during the rolling current-carrying friction process; form the second friction torque evolution curve and wear amount evolution curve;

[0041] S3: Under normal temperature conditions, turn off the power and the cooling device, run the rolling friction and wear performance testing device, set the load and speed conditions the same as in S1, and record the evolution of friction torque and wear amount over time in the rolling current-carrying friction process of the electrical contact 4 of the same specification as in S1; form the third friction torque evolution curve and wear amount evolution curve.

[0042] S4: Compare and analyze the evolution curves of the second friction torque and wear amount with the first friction torque and wear amount. Subtract the two to form the fourth friction torque and wear amount evolution curve. The fourth friction torque and wear amount evolution curve represents the effect of pure thermal effect-induced current-carrying friction damage on current-carrying friction and wear performance. The difference between the second and third friction torque and wear amount evolution curves represents the effect of pure current-induced current-carrying friction damage on current-carrying friction and wear performance.

[0043] By comparing and analyzing the evolution curves of the third frictional torque with the wear amount, the fourth frictional torque with the wear amount, and the fifth frictional torque with the wear amount, the dominant mechanism of rolling current frictional coupling damage was determined.

[0044] Identifying the dominant wear mechanism in rolling current frictional combined wear has the following advantages;

[0045] 1. Life expectancy prediction

[0046] Identifying the dominant wear mechanism can more accurately predict the lifespan of slip rings. In-depth research into the dominant wear mechanism allows for the establishment of corresponding wear models. These models can predict the wear degree and remaining lifespan of slip rings based on different operating conditions and environments, providing a scientific basis for equipment maintenance and replacement. For example, in some critical application areas, such as aerospace and medical devices, the reliability requirements for slip rings are extremely high; accurate lifespan prediction can prevent serious consequences caused by slip ring failures.

[0047] 2. Improve performance

[0048] To address the dominant wear mechanism, corresponding measures can be taken, such as selecting appropriate electrical contact materials and processing techniques, thereby improving the performance of the slip ring. For example, if thermal wear is the dominant mechanism, the temperature of the slip ring can be reduced by improving the heat dissipation design, thus reducing thermal wear and improving the electrical transmission performance and stability of the slip ring.

[0049] For cases where mechanical wear is the primary cause, the coefficient of friction can be reduced and the efficiency of the slip ring improved by optimizing the lubrication system or employing special surface treatment techniques. For cases where wear induced by pure electrical effects is the primary cause, friction pairs made of electrical contact materials with good electrical contact performance can be selected, appropriate processing techniques can be chosen to improve the electrical contact performance of the electrical contact material surface, or a friction pair structure with good electrical contact effect can be designed.

[0050] 3. Reduce costs and resource waste

[0051] Identifying the dominant wear mechanism allows for the development of more rational maintenance strategies. Based on different wear mechanisms, the focus and frequency of maintenance can be determined, avoiding unnecessary maintenance and replacements and reducing maintenance costs.

[0052] For example, if arc wear is the primary cause, the insulation performance of the slip ring and the location where arcs occur can be checked regularly, and repairs or replacements can be made in a timely manner; if mechanical wear is more severe, the inspection and lubrication of the rolling contact pairs can be strengthened to extend the service life of the slip ring.

[0053] Understanding the dominant wear mechanism helps in the rational use of resources. During the production and use of slip rings, the dominant wear mechanism can be used to optimize material usage and processing techniques, thereby reducing resource waste.

[0054] For example, if thermal wear is the dominant factor, efforts can be made to improve the heat resistance of materials during material selection and processing, and reduce the use of materials with excessively high performance requirements, thereby reducing costs.

[0055] In summary, identifying the dominant mechanisms of the three types of combined wear in rolling current-carrying friction is of great significance for optimizing slip ring design, improving performance and reliability, and reducing costs and resource waste.

[0056] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A current-carrying frictional coupling damage decoupling detection device based on in-situ cooling, characterized in that: include: The rolling current-carrying friction and wear performance testing device body includes an active rotating wheel, a driven rotating wheel, and an electrical contact. The electrical contact is slidably connected between the active rotating wheel and the driven rotating wheel. The rotation of the active rotating wheel can drive the electrical contact and the driven rotating wheel to rotate. The active rotating wheel, the electrical contact, and the driven rotating wheel, together with a power supply, can form a rolling friction current-carrying circuit. A cooling device, wherein the cooling device is used to perform in-situ cooling at the locations where the electrical contact element contacts the driving wheel and the driven wheel, respectively; and A temperature detection device is used to measure the temperature at the position where the electrical contact element contacts the driving wheel and the driven wheel; It also includes a temperature controller, which is signal-connected to the temperature detection device to receive the temperature signal measured by the temperature detection device, and is able to control the cooling device to cool the position where the electrical contact is in contact with the driving wheel and the driven wheel to the design temperature; The cooling device includes a compressed air source, a first nozzle, a first nozzle, a second nozzle, and a second nozzle. The compressed air source is fixedly connected to the body of the rolling current friction and wear performance testing device. One end of the first nozzle is connected to and communicates with the compressed air source, and the other end is connected to and communicates with the first nozzle. The first nozzle is used to aim at the position where the electrical contact element contacts the active rotating wheel to blow the gas supplied by the compressed air source towards the position where the electrical contact element contacts the active rotating wheel and perform in-situ cooling. The second nozzle is used to aim at the position where the electrical contact element contacts the driven rotating wheel to blow the gas supplied by the compressed air source towards the position where the electrical contact element contacts the driven rotating wheel and perform in-situ cooling.

2. The current-carrying frictional coupling damage decoupling detection device based on in-situ cooling according to claim 1, characterized in that: It also includes a nozzle manifold and a pressure regulating valve. One end of the nozzle manifold is used to connect and communicate with the first nozzle and the second nozzle, and the other end is used to connect and communicate with the pressure regulating valve. The end of the pressure regulating valve away from the nozzle manifold is used to connect and communicate with the compressed air source.

3. The current-carrying frictional coupling damage decoupling detection device based on in-situ cooling according to claim 2, characterized in that: It also includes a first bracket and a second bracket. The bottom of the first bracket is fixedly connected to the body of the rolling current friction and wear performance testing device, and the top of the first bracket is detachably fixedly connected to the first nozzle. The bottom of the second bracket is fixedly connected to the body of the rolling current friction and wear performance testing device, and the top of the second bracket is detachably fixedly connected to the second nozzle.

4. The current-carrying frictional coupling damage decoupling detection device based on in-situ cooling according to claim 3, characterized in that: Both the first nozzle and the second nozzle are serpentine cooling pipes.

5. The current-carrying frictional coupling damage decoupling detection device based on in-situ cooling according to claim 1, characterized in that: The temperature detection device includes a thermal imaging camera, which is positioned above the electrical contact and aligned with the position where the electrical contact contacts the driving wheel and the driven wheel to monitor the temperature change in that area in real time.

6. The in-situ cooling based current-carrying frictional coupling damage decoupling detection device according to claim 1, wherein: The temperature detection device also includes a thermocouple, which is fixedly connected to the body of the rolling current-carrying friction and wear performance testing device and is positioned at the contact point between the electrical contact element and the active and driven wheels for temperature measurement.

7. A detection method for a current-carrying frictional coupling damage decoupling detection device based on in-situ cooling as described in any one of claims 1 to 6, characterized in that: Includes the following steps: S1: Turn on the power and run the rolling current friction and wear performance test device body under any current parameter. Record the evolution of temperature, friction torque and wear amount over time during the rolling current friction process of any electrical contact, and form the first friction torque evolution curve and wear amount evolution curve. S2: Turn on the power, start the cooling device, run the rolling friction and wear performance testing device, set the same load and speed conditions as S1, adjust the cooling device to bring the temperature at the contact position between the electrical contact and the driving and driven wheels to room temperature, record the evolution of friction torque and wear amount over time in the rolling current-carrying friction process of the electrical contact with the same specifications as S1; form the second friction torque evolution curve and wear amount evolution curve; S3: Under normal temperature conditions, turn off the power and the cooling device, run the rolling friction and wear performance testing device, set the same load and speed conditions as in S1, and record the evolution of friction torque and wear amount over time in the rolling current-carrying friction process of the same specification electrical contact parts as in S1; form the third friction torque evolution curve and wear amount evolution curve. S4: Compare and analyze the evolution curves of the second friction torque and wear amount with the first friction torque and wear amount. Subtract the two to form the fourth friction torque and wear amount evolution curve. The fourth friction torque and wear amount evolution curve represents the effect of pure thermal effect-induced current-carrying friction damage on current-carrying friction and wear performance. The difference between the second and third friction torque and wear amount evolution curves represents the effect of pure current-induced current-carrying friction damage on current-carrying friction and wear performance. By comparing and analyzing the evolution curves of the third frictional torque with the wear amount, the fourth frictional torque with the wear amount, and the fifth frictional torque with the wear amount, the dominant mechanism of rolling current frictional coupling damage was determined.

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