A fretting wear testing device under high temperature gas environment

Abstract

This invention provides a fretting wear testing device under high-temperature gas environment. The device features a double-layered test chamber designed to simulate a high-temperature gas environment. Adjustable high temperature, gas composition, and pressure conditions are achieved through a heating unit and a gas control module, ensuring the test is conducted under conditions close to actual service conditions. By applying different normal forces, high frequencies, and variable displacement amplitudes, the device simulates fretting wear behavior under high-temperature gas environment to study the wear characteristics between the sample and the mating pair. The double-layered shell structure and high-purity alumina fiber materials, among other high-temperature resistant materials, enable the double-layered test chamber to withstand the high-temperature environment and effectively isolate heat to ensure operational safety. Finally, the temperature and pressure within the test chamber are monitored in real time by heating elements and an external drive system to ensure that the temperature and pressure remain stable within the set range during the experiment, preventing damage to the equipment due to overheating or overpressure.

Description

Technical Field

[0001] This invention relates to the technical field of fretting wear testing, and specifically to a fretting wear testing device under high-temperature gas environment. Background Technology

[0002] In industrial equipment, especially in high-temperature gas environments, equipment components are often subjected to excitation by fluid media, resulting in fretting wear, which affects their service life and reliability. How to simulate high-temperature fretting wear of equipment components in such high-temperature environments is a current challenge. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a fretting wear testing device under high-temperature gas environment, so as to solve the current technical problem of how to simulate high-temperature fretting wear of equipment components under such high-temperature environment.

[0004] See Figure 1 and Figure 2 This invention provides a fretting wear testing device under high-temperature gas environment, comprising:

[0005] The double-layer test chamber is constructed from the inside out using an alumina ceramic fiber interlayer and a pressure-bearing boundary metal plate. The front of the double-layer test chamber has a movable door that extends into the chamber. The double-layer test chamber is connected to a gas control module and an external drive system.

[0006] The double-layer test chamber is equipped with a limiting slot unit, a heating unit, a clamping unit, a tangential loading unit, a first normal loading unit, and a second normal loading unit. The clamping unit includes a sample clamp and a grinding pair clamp. The tangential loading unit includes a piezoelectric actuator, a tangential transmission component, and a tangential sealing connector. The first normal loading unit includes a helical force applicator, a first normal sealing connector, and a first normal transmission component. The second normal loading unit includes a second normal sealing connector and a second normal transmission component.

[0007] One side of the tangential drive is connected to one side of the sample clamp, and one end of the tangential drive is sequentially connected to a tangential sealing connector and a piezoelectric actuator. The other side of the tangential drive is connected to one end of a first normal drive, and the other end of the first normal drive is sequentially connected to a first normal sealing connector and a helical force applicator. The other side of the sample clamp is connected to the side near the grinding pair clamp, and the other side of the grinding pair clamp is connected to one end of a second normal drive. The other end of the second normal drive is connected to a second normal sealing connector. The piezoelectric actuator and the helical force applicator are respectively connected to an external drive system.

[0008] The heating unit includes a heating element and a thermocouple. The heating element is located on the periphery of the sample fixture and the grinding pair fixture. The thermocouple is located close to the heating element and connected to an external drive system.

[0009] Optionally, the tangential sealing connector, the first normal sealing connector, and the second normal sealing connector each include:

[0010] Inner sleeve, inner sleeve base, inner sleeve pressure cap, sealing outer sleeve, connector, inner retaining ring, transmission component, connecting chuck, bellows, outer connecting sleeve, inner support sleeve, outer sleeve nut, connecting rod, connecting rod end cap, outer retaining ring, outer support sleeve, outer sleeve, outer sleeve, outer sleeve base and outer sleeve clamping nut;

[0011] One end of the inner sleeve is connected to the transmission component, and the other end is connected to one end of the inner sleeve base. An inner sleeve pressure cap is fitted around the periphery of the inner sleeve. A sealing outer sleeve, an inner retaining ring, and an inner support sleeve are sequentially arranged around the periphery of the inner sleeve base. One end of the connecting chuck is sequentially connected to the sealing outer sleeve through the inner support sleeve and the inner retaining ring.

[0012] One end of the corrugated pipe is connected to the other end of the inner jacket base via a connector. The outer connecting sleeve is fitted around the periphery of the corrugated pipe. One end of the outer connecting sleeve is connected to the other end of the connecting chuck, and the other end is fitted with an outer sleeve nut. One end of the connecting rod passes through the outer sleeve nut and connects to the other end of the corrugated pipe. The other end passes through the outer retaining ring and the outer support sleeve in sequence and connects to the connecting rod end cap. An outer jacket base is fitted outside the outer retaining ring and the outer support sleeve. One end of the outer jacket base is connected to the outer sleeve nut, and the other end is connected to the outer jacket clamping nut via the outer jacket.

[0013] Optionally, one side of the tangential transmission member is connected to one side of the sample clamp, including:

[0014] The sample fixture includes a tangential tie rod fixture, a sample base, and a sample clamping screw. The tangential tie rod fixture is fixed to one side of the tangential transmission component. The sample base is detachably connected to the tangential tie rod fixture. The test sample is placed inside the sample base and fixed by the sample clamping screw.

[0015] Optionally, the other side of the sample clamp is connected to a side close to the grinding pair clamp, and the other side of the grinding pair clamp is connected to one end of the second normal transmission member, including:

[0016] The grinding pair fixture has a secondary sample inside, and the side of the grinding pair fixture closer to the secondary sample abuts against the other side of the sample fixture, while the other side of the grinding pair fixture away from the secondary sample is connected to one end of the second normal transmission member.

[0017] Optionally, the gas control module includes:

[0018] The test chamber includes a sampling and measurement unit, a gas filling unit, a gas exhaust unit, and a vacuum unit. The double-layered test chamber has a sampling port, a filling port, a vacuum port, and an exhaust port extending into the chamber. The gas filling unit includes a manifold, a pressure reducing valve, a flow controller, a gas distribution buffer tank, a safety valve, and a filling solenoid valve. One end of the gas manifold is connected to a gas tank, and the other end converges at one end of the main gas pipeline. The other end of the main gas pipeline is connected to the filling port, and the pressure reducing valve, flow controller, gas distribution buffer tank, safety valve, and filling solenoid valve are sequentially installed at the other end of the main gas pipeline.

[0019] The gas exhaust unit includes an exhaust pipe, an electric regulating valve, and an exhaust electric cooler. One end of the exhaust pipe is connected to an exhaust port, and the other end is connected to the exhaust electric cooler. The electric regulating valve is located on the exhaust pipe near the exhaust port.

[0020] The sampling and measurement unit includes a sampling tube, a sampling electric cooler, and an analyzer. One end of the sampling tube is connected to a sampling hole, and the other end is connected to the sampling electric cooler and the analyzer in sequence. The analyzer is connected to an external drive system.

[0021] The vacuum pumping unit includes a vacuum tube, a vacuum pump, and a vacuum solenoid valve. One end of the vacuum tube is connected to a vacuum port, and the other end is connected to the vacuum solenoid valve and the vacuum pump in sequence.

[0022] Optionally, it also includes:

[0023] The limiting slot unit includes a positioning rod, a normal support block, tangential set screws, and a slot body. One end of the first normal transmission member and one end of the second normal transmission member respectively pass through the positioning rod on the slot body and are located at the upper end of the normal support block in the slot body. The sample fixture and the grinding pair fixture are both embedded in the limiting slot in the middle of the slot body. A pair of tangential set screws are provided on both sides of the slot body corresponding to the sample fixture.

[0024] Compared with the prior art, the present invention:

[0025] 1. A double-layer test chamber capable of simulating a high-temperature gas environment was designed. The high temperature, gas composition and pressure conditions are adjustable through a heating unit and a gas control module to ensure that the test is conducted under conditions close to actual service conditions.

[0026] 2. By applying different normal forces, high frequencies, and variable displacement amplitudes, the fretting wear behavior under high-temperature gas environment is simulated to study the wear characteristics between the sample and the mating pair.

[0027] 3. The double-layer shell structure and high-purity alumina fiber materials are used to make the double-layer test chamber able to withstand high-temperature environments and effectively isolate heat to ensure operational safety.

[0028] 4. The temperature and pressure inside the test chamber are monitored in real time through the heating element and external drive system to ensure that the temperature and pressure remain stable within the set range during the experiment, and to avoid damage to the equipment due to overheating or overpressure. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic cross-sectional view of the double-layer test chamber in this invention;

[0032] Figure 2 This is a schematic diagram of the overall structure of the double-layer test chamber in this invention;

[0033] Figure 3 A schematic diagram of the connection structure of the tangential loading unit, the first normal loading unit, and the second normal loading unit in this invention;

[0034] Figure 4 This is a schematic diagram of the structure of the tangential sealing connector, the first normal sealing connector, and the second normal sealing connector in this invention;

[0035] Figure 5 This is a schematic diagram of the sample clamp structure in this invention;

[0036] Figure 6 This is a schematic diagram of the structure of the grinding pair fixture in this invention;

[0037] Figure 7 This is a schematic diagram of the contact between the sample fixture and the grinding pair fixture in this invention;

[0038] Figure 8 This is a schematic diagram of the limiting slot unit in this invention;

[0039] Figure 9 This is a schematic diagram of the overall structure of the present invention, which includes a sampling and measurement unit, a gas filling unit, a gas exhaust unit, and a vacuum pumping unit.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Double-layer test chamber; 11. Heating element; 12. Thermocouple; 13. Sampling port; 14. Gas filling port; 15. Vacuum port; 16. Exhaust port; 101. Tangential transmission component; 102. Tangential sealing connector; 201. Screw force applicator; 202. First normal sealing connector; 203. First normal transmission component; 301. Second normal sealing connector; 302. Second normal transmission component; 401. Positioning rod; 402. Normal support block; 403. Tangential set screw; 404. Slot body; 501. Inner jacket; 502. Inner jacket base; 503. 504. Inner jacket pressure cap; 505. Sealing outer sleeve; 506. Connector; 507. Inner retaining ring; 508. Connecting chuck; 509. Bellows; 510. Outer connecting sleeve; 511. Inner support sleeve; 512. Outer sleeve nut; 513. Connecting rod end cap; 514. Outer retaining ring; 515. Outer support sleeve; 516. Outer jacket; 517. Outer jacket base; 518. Outer jacket clamping nut; 601. Sample fixture; 602. Grinding pair fixture; 603. Tangential tie rod fixture; 604. Sample base; 605. Sample clamping set screw. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other implementation cases obtained by those skilled in the art without creative effort are within the scope of protection of this application. Functional units with the same reference numerals in the examples of this invention have the same and similar structures and functions.

[0043] See Figure 1 , Figure 2 and Figure 3 This invention provides a fretting wear testing device under high-temperature gas environment, comprising:

[0044] The double-layer test chamber 1 is made of alumina ceramic fiber sandwich and pressure-bearing boundary metal plate from the inside to the outside. The double-layer test chamber 1 has a movable door that runs through the chamber on the front. The double-layer test chamber 1 is connected to a gas control module and an external drive system.

[0045] The double-layer test chamber 1 is equipped with a limiting slot unit, a heating unit, a clamping unit, a tangential loading unit, a first normal loading unit, and a second normal loading unit. The clamping unit includes a sample clamp 601 and a grinding pair clamp 602. The tangential loading unit includes a piezoelectric actuator, a tangential transmission component 101, and a tangential sealing connector 102. The first normal loading unit includes a helical force applicator 201, a first normal sealing connector 202, and a first normal transmission component 203. The second normal loading unit includes a second normal sealing connector 301 and a second normal transmission component 302.

[0046] One side of the tangential transmission member 101 is connected to one side of the sample clamp 601, and one end of the tangential transmission member 101 is sequentially connected to the tangential sealing connector 102 and the piezoelectric actuator. The other side of the tangential transmission member 101 is connected to one end of the first normal transmission member 203. The other end of the first normal transmission member 203 is sequentially connected to the first normal sealing connector 202 and the helical force applicator 201. The other side of the sample clamp 601 is connected to the side close to the grinding pair clamp 602. The other side of the grinding pair clamp 602 is connected to one end of the second normal transmission member. The other end of the second normal transmission member is connected to the second normal sealing connector 301. The piezoelectric actuator and the helical force applicator 201 are respectively connected to an external drive system.

[0047] The heating unit includes a heating element 11 and a thermocouple 12. The heating element 11 is disposed on the periphery of the sample clamp 601 and the grinding pair clamp 602. The thermocouple 12 is disposed close to the heating element 11 and connected to an external drive system.

[0048] In this embodiment, the double-layer test chamber 1 adopts an integrated design with a single door at the front, which is easy to operate and convenient for loading and unloading samples. It is sealed by a latch, and the furnace door and other joints are sealed with ceramic fiber high-temperature resistant material to ensure airtightness and prevent gas leakage and infiltration of outside air. The furnace employs a double-shell structure. The inner furnace chamber, 200mm long, 150mm wide, and 150mm high, is made of high-purity alumina polycrystalline fiber material and new materials that reflect infrared heat radiation, capable of withstanding temperatures up to 1400℃. The furnace undergoes vacuum forming and ultra-high temperature calcination, and its inner surface is coated with a high-temperature resistant heat-insulating coating to effectively prevent ash and slag from falling off. The middle layer is filled with alumina fiber insulation material to reduce heat loss and ensure stability in the high-temperature environment. The outer pressure boundary, the furnace shell, also features a double-layer integrated design. The inner shell is made of thickened cold-rolled steel plate welded using a special process, capable of withstanding high temperatures and pressures. The outer shell surface undergoes rust-proof and high-temperature resistant baking paint treatment. Square steel can also be added around the perimeter for further structural reinforcement. This double-shell structure ensures that the outer shell temperature rise remains below 30℃ even when the internal temperature is high. Furthermore, a removable metal cover provides a detachable, integrated enclosure for easy inspection and maintenance.

[0049] See Figure 1 The heating rods are made of high-quality U-shaped silicon carbide rods, located on the left, right, and rear sides of the sample clamp 601 and the grinding pair clamp 602, respectively, providing heating from 0 to 1200℃. They offer strong thermal radiation, durability, and long-lasting performance. Temperature is precisely controlled via an external drive system that programs the current to the heating element. Each heating rod can be individually controlled, and the 30-segment heating and cooling programs can be programmed step-by-step for automated heating and cooling. The system utilizes an artificial intelligence PID control algorithm and a silicon controlled rectifier (SCR) control method. An external control panel can be connected, including a digital display programmable temperature controller, voltmeter, ammeter, power switch, and start / stop buttons. The external drive system also features alarm protection functions for over-temperature, temperature deviation, leakage, and open circuit, automatically cutting off the heating power supply.

[0050] See Figure 1 The thermocouple 12 is a platinum-rhodium S-type thermocouple 12, used for real-time measurement of the internal temperature of the double-layer test chamber 1, capable of measuring from 0 to 1300 degrees Celsius with a measurement error of ±1℃. It mainly includes a junction box, cold junction, flange, etc. The outer tube material is corundum, connected to the double-layer test chamber 1 via a flange connection, with a total length that can be set to 420 mm. The outer diameter of the ceramic tube is 7 mm, and the ceramic tube material is high-alumina. Four measuring points are arranged in the double-layer test chamber 1, two of which are located near the chamber itself, and two are used to measure the ambient gas temperature. The thermocouple extends from the upper side of the double-layer test chamber 1. For safety, an over-temperature protection device is installed to prevent damage to the equipment or accidents caused by excessive temperature. The thermocouple 12 converts the collected physical signal into a weak electrical signal. After linearization by a signal amplifier, the weak electrical signal is converted into a standard electrical signal of 4~20 mV. The acquisition card reads the standard signal and converts the result back into a physical signal, which is displayed in real-time on the control panel display window of the external drive system.

[0051] See Figures 5-7 In this embodiment, the sample clamp 601 and the grinding pair clamp 602 are exemplified as a wire sample clamp 601 and a pipe sample clamp 601, which can fix pipe samples and wire samples of different lengths and outer diameters. The tangential loading unit includes a piezoelectric actuator, a tangential transmission component 101, and a tangential sealing connector 102. The first normal loading unit includes a helical force applicator 201, a first normal sealing connector 202, and a first normal transmission component 203. The second normal loading unit includes a second normal sealing connector 301 and a second normal transmission component 302.

[0052] Since the tangential transmission component 101 is connected to the tangential sealing connector 102, the piezoelectric actuator drives the wire sample holder on the tangential transmission component 101 to slide tangentially via the tangential sealing connector 102. In the first normal loading unit, the helical force applicator 201 applies a constant normal load through the connected first normal sealing connector 202, and transmits the normal force through the first normal transmission component 203. The second normal sealing connector 301 is connected to the tube sample holder 601 through the second normal transmission component 302, so that the tube sample holder 601 abuts against the wire sample holder 601. The transmitted normal force causes the wire sample holder 601 and the tube sample holder 601 to contact and bear the normal load, thereby conducting fretting wear experiments under different normal loads. This describes a coupled tangential and normal test, but the piezoelectric actuator and the helical force applicator 201 can also be controlled by the drive system to perform tangential and normal tests respectively.

[0053] See Figure 4 In another embodiment, one end of the inner sleeve 501 is connected to the transmission component, and the other end is connected to one end of the inner sleeve base 502. The inner sleeve 501 is fitted with an inner sleeve pressure cap 503. The inner sleeve base 502 is sequentially surrounded by a sealing outer sleeve 504, an inner retaining ring 506, and an inner support sleeve 510. One end of the connecting chuck 507 is sequentially connected to the sealing outer sleeve 504 through the inner support sleeve 510 and the inner retaining ring 506.

[0054] One end of the corrugated pipe 508 is connected to the other end of the inner jacket base 502 via a connector 505. The outer connecting sleeve 509 is sleeved around the corrugated pipe 508. One end of the outer connecting sleeve 509 is connected to the other end of the connecting chuck 507, and the other end is fitted with an outer sleeve nut 511. One end of the connecting rod 512 passes through the outer sleeve nut 511 and connects to the other end of the corrugated pipe 508. The other end passes through the outer retaining ring 514 and the outer support sleeve 515 in sequence and connects to the connecting rod end cap 513. An outer jacket base 517 is fitted outside the outer retaining ring 514 and the outer support sleeve 515. One end of the outer jacket base 517 is connected to the outer sleeve nut 511, and the other end is connected to the outer jacket clamping nut 518 via an outer jacket 516.

[0055] Since one end of the inner sleeve 501 is connected to the transmission component and the other end is connected to one end of the inner sleeve base 502, the inner sleeve cap 503 can achieve both a fixed connection and a sealing effect. Furthermore, the sealing outer sleeve 504, which is fitted around the inner sleeve base 502, can also form a primary barrier to prevent external gas or impurities from entering, thus forming a first-level seal.

[0056] By using the inner support sleeve 510 and inner retaining ring 506 encircling the inner jacket base 502, a sealed connection is achieved when the inner retaining ring 506 is abutted between the connecting chuck 507 and the sealing outer sleeve 504. The inner support sleeve 510 is also used to fill the gap between the inside of the connecting chuck 507 and the inner jacket base 502, thus achieving a secondary seal.

[0057] The corrugated pipe 508 is fitted with an outer connecting sleeve 509 around its periphery. One end of the outer connecting sleeve 509 is connected to the other end of the connecting chuck 507, and the other end is fitted with an outer sleeve nut 511. The outer sleeve nut 511 is used to increase the airtightness of the outer connecting sleeve 509 and prevent internal gas from diffusing outward, thus forming a three-stage seal.

[0058] The outer clamping nut 518 is located at the end of the end. The outer clamping nut 516 is similar to a conical structure with a gap. The outer clamping nut is fixed on the outer clamping base 517. The tighter it is screwed, the tighter the conical fit between the outer clamping nut 516 and the outer clamping nut 518 becomes, and the smaller the gap of the outer clamping nut 516 becomes. This clamps the connecting rod end cap 513 tighter, achieving a seal by reducing the gap, thus forming a four-level seal.

[0059] In another embodiment, the sample fixture 601 includes a tangential tie rod fixture 603, a sample base 604, and a sample clamping screw 605. The tangential tie rod fixture 603 is fixed to one side of the tangential transmission member 101. The sample base 604 is detachably connected to the tangential tie rod fixture 603. The test sample is placed inside the sample base 604 and fixed by the sample clamping screw 605.

[0060] The grinding pair fixture 602 has a secondary sample inside, and the side of the grinding pair fixture 602 near the secondary sample abuts against the other side of the sample fixture 601. The other side of the grinding pair fixture 602 away from the secondary sample is connected to one end of the second normal transmission member 302.

[0061] See Figure 1 , Figure 2 and Figure 9 In another embodiment, the gas control module includes a sampling and measurement unit, a gas filling unit, a gas exhaust unit, and a vacuum unit; the double-layer test chamber 1 is provided with a sampling hole 13, a filling hole 14, a vacuum hole 15, and an exhaust hole 16 extending into the chamber; the gas filling unit includes a manifold, a pressure reducing valve, a flow controller, a gas distribution buffer tank, a safety valve, and a filling solenoid valve; one end of the manifold is connected to a gas tank, and the other end is connected to one end of the main gas pipeline; the other end of the main gas pipeline is connected to the filling hole 14, and the pressure reducing valve, flow controller, gas distribution buffer tank, safety valve, and filling solenoid valve are sequentially arranged at the other end of the main gas pipeline;

[0062] The gas exhaust unit includes an exhaust pipe, an electric regulating valve, and an exhaust electric cooler. One end of the exhaust pipe is connected to an exhaust port 16, and the other end is connected to the exhaust electric cooler. The electric regulating valve is located on the exhaust pipe near the exhaust port 16.

[0063] The sampling and measurement unit includes a sampling tube, a sampling electric cooler, and an analyzer. One end of the sampling tube is connected to the sampling port 13, and the other end is connected to the sampling electric cooler and the analyzer in sequence. The analyzer is connected to an external drive system.

[0064] The vacuum pumping unit includes a vacuum tube, a vacuum pump, and a vacuum solenoid valve. One end of the vacuum tube is connected to a vacuum port 15, and the other end is connected to the vacuum solenoid valve and the vacuum pump in sequence.

[0065] A flow controller primarily adjusts the gas supply according to experimental requirements, ensuring that the gas concentration or pressure is maintained at a set value. Flow controllers are typically connected to a control system via electronic signals to monitor and adjust the flow rate in real time.

[0066] Gas distribution buffer tanks mainly serve to stabilize gas flow. After gas enters the system from multiple gas tanks through manifolds and pressure reducing valves, the gas flow may fluctuate or pulsate. Buffer tanks can absorb these unstable fluctuations to ensure that the gas flow received by downstream equipment is more stable.

[0067] The safety valve is a critical protective device in the system, used to prevent system overpressure. If the gas pressure in the tank exceeds the set safety value, the safety valve will automatically open to release excess gas, preventing damage to the equipment or causing a safety accident. The system is equipped with a drain valve to discharge residual or waste gas from the pipeline when needed. During gas switching or system maintenance, the drain valve can be used to quickly empty residual gas from the pipeline, preventing residual gas from affecting subsequent experiments. The solenoid valve can automatically open or close according to the control system's instructions to control gas flow. In this way, the solenoid valve can precisely control the gas supply and stop, allowing the system to flexibly adjust the gas supply according to experimental needs. When gas supply needs to be started, the solenoid valve opens; when gas supply is not needed or needs to be stopped, the solenoid valve closes. The electrically adjustable valve can precisely regulate the gas flow rate by controlling the valve opening.

[0068] In another embodiment, the present invention further includes a limiting slot unit, including a positioning rod 401, a normal support block 402, a tangential set screw 403, and a slot body 404. One end of the first normal transmission member 203 and one end of the second normal transmission member 302 respectively pass through the positioning rod 401 on the slot body 404 and are located at the upper end of the normal support block 402 in the slot body 404. The sample clamp 601 and the grinding pair clamp 602 are both embedded in the limiting slot in the middle of the slot body 404. A pair of tangential set screws 403 are provided on both sides of the slot body 404 corresponding to the sample clamp 601.

[0069] The positioning rod 401 provided on the slot body 404 limits and fixes one end of the first normal transmission member 203 and one end of the second normal transmission member 302 respectively. At the same time, one end of the first normal transmission member 203 and the second normal transmission member 302 are supported by the normal support block 402 in the slot body 404. Meanwhile, the sample clamp 601 and the grinding pair clamp 602 are both embedded in the limiting groove in the middle of the slot body 404, realizing the overall limiting, and are fixed by a pair of tangential set screws 403 provided on both sides of the slot body 404 corresponding to the sample clamp 601.

[0070] Overall, during the experiment, the device first tested and ensured that all system instruments in the external drive system were functioning correctly, including temperature, pressure, oxygen concentration, and normal force. Then, the system was repeatedly evacuated using a vacuum pump to remove air. Next, the gas filling and emptying unit was activated to inject the required experimental gas. If necessary, evacuation and gas injection were repeated. By monitoring the oxygen concentration within the chamber, the composition of the gas in the experimental chamber could be determined. The heating system was then activated, using electric heating to heat the double-layered experimental chamber 1 to the specified temperature. Each element can be controlled independently, ensuring the system can simulate different temperature conditions. The core of the heating unit is the built-in electric heating rod and thermocouple 12, with precise temperature control achieved by controlling the current. Until the pre-experimental temperature is reached, as the temperature rises, the pressure in the double-layered experimental chamber 1 increases. When the pressure becomes excessive, the pressure relief valve is activated, and the system can be automatically adjusted by computer feedback. Once the pressure, temperature, and atmosphere within the double-layered test chamber 1 meet the experimental requirements, the fretting abrasion testing machine is started. Based on the test parameters, the system outputs the corresponding normal force, displacement amplitude, and vibration frequency, adjusting to the preset conditions to conduct the fretting abrasion test. During the test, the system monitors and records parameters such as temperature, pressure, oxygen concentration, airflow rate, normal force, displacement amplitude, and vibration frequency. Remote control can be used if necessary to ensure the experiment proceeds smoothly.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fretting wear testing device under high-temperature gas environment, characterized in that, include: The double-layer test chamber is constructed from the inside out using an alumina ceramic fiber interlayer and a pressure-bearing boundary metal plate. The front of the double-layer test chamber has a movable door that extends into the chamber. The double-layer test chamber is connected to a gas control module and an external drive system. The double-layer test chamber is equipped with a limiting slot unit, a heating unit, a clamping unit, a tangential loading unit, a first normal loading unit, and a second normal loading unit. The clamping unit includes a sample clamp and a grinding pair clamp. The tangential loading unit includes a piezoelectric actuator, a tangential transmission component, and a tangential sealing connector. The first normal loading unit includes a helical force applicator, a first normal sealing connector, and a first normal transmission component. The second normal loading unit includes a second normal sealing connector and a second normal transmission component. Each of the tangential sealing connector, the first normal sealing connector, and the second normal sealing connector includes an inner sleeve, an inner sleeve base, an inner sleeve pressure cap, a sealing outer sleeve, a connector, an inner retaining ring, a transmission component, a connecting chuck, a bellows, an outer connecting sleeve, an inner support sleeve, an outer sleeve nut, a connecting rod, a connecting rod end cap, an outer retaining ring, an outer support sleeve, an outer sleeve, an outer sleeve base, and an outer sleeve clamping nut. One end of the inner sleeve is connected to the transmission component, and the other end is connected to one end of the inner sleeve base. An inner sleeve pressure cap is fitted around the periphery of the inner sleeve. A sealing outer sleeve, an inner retaining ring, and an inner support sleeve are sequentially arranged around the periphery of the inner sleeve base. One end of the connecting chuck is connected to the sealing outer sleeve sequentially through the inner support sleeve and the inner retaining ring. One end of the corrugated pipe is connected to the other end of the inner jacket base via a connector. The outer connecting sleeve is fitted around the periphery of the corrugated pipe. One end of the outer connecting sleeve is connected to the other end of the connecting chuck. The other end of the outer connecting sleeve is fitted with an outer sleeve nut. One end of the connecting rod passes through the outer sleeve nut and connects to the other end of the corrugated pipe. The other end of the connecting rod passes through the outer retaining ring and the outer support sleeve in sequence and connects to the connecting rod end cap. An outer jacket base is fitted outside the outer retaining ring and the outer support sleeve. One end of the outer jacket base is connected to the outer sleeve nut, and its other end is connected to the outer jacket clamping nut via the outer jacket. One side of the tangential drive is connected to one side of the sample clamp, and one end of the tangential drive is sequentially connected to a tangential sealing connector and a piezoelectric actuator. The other side of the tangential drive is connected to one end of a first normal drive, and the other end of the first normal drive is sequentially connected to a first normal sealing connector and a helical force applicator. The other side of the sample clamp is connected to one side of the grinding pair clamp, and the other side of the grinding pair clamp is connected to one end of a second normal drive. The other end of the second normal drive is connected to a second normal sealing connector. The piezoelectric actuator and the helical force applicator are respectively connected to an external drive system. The heating unit includes a heating element and a thermocouple. The heating element is located on the periphery of the sample fixture and the grinding pair fixture. The thermocouple is located close to the heating element and connected to an external drive system.

2. The fretting wear testing device under high-temperature gas environment as described in claim 1, characterized in that, One side of the tangential transmission component is connected to one side of the sample clamp, including: The sample fixture includes a tangential tie rod fixture, a sample base, and a sample clamping screw. The tangential tie rod fixture is fixed to one side of the tangential transmission component. The sample base is detachably connected to the tangential tie rod fixture. The test sample is placed inside the sample base and fixed by the sample clamping screw.

3. The fretting wear testing device under high-temperature gas environment as described in claim 1, characterized in that, The other side of the sample clamp is connected to one side of the grinding pair clamp, and the other side of the grinding pair clamp is connected to one end of the second normal transmission member, including: The grinding pair fixture has a secondary sample inside, and the side of the grinding pair fixture closer to the secondary sample abuts against the other side of the sample fixture, while the other side of the grinding pair fixture away from the secondary sample is connected to one end of the second normal transmission member.

4. The fretting wear testing device under high-temperature gas environment as described in claim 1, characterized in that, The gas control module includes: The test chamber includes a sampling and measurement unit, a gas filling unit, a gas exhaust unit, and a vacuum unit. The double-layered test chamber is provided with a sampling port, a filling port, a vacuum port, and an exhaust port extending into the chamber. The gas filling unit includes a manifold, a pressure reducing valve, a flow controller, a gas distribution buffer tank, a safety valve, and a filling solenoid valve. One end of the manifold is connected to a gas tank, and the other end converges at one end of the main gas pipeline. The other end of the main gas pipeline is connected to the filling port, and the pressure reducing valve, flow controller, gas distribution buffer tank, safety valve, and filling solenoid valve are sequentially installed at the other end of the main gas pipeline. The gas exhaust unit includes an exhaust pipe, an electric regulating valve, and an exhaust electric cooler. One end of the exhaust pipe is connected to an exhaust port, and the other end is connected to the exhaust electric cooler. The electric regulating valve is located on the exhaust pipe near the exhaust port. The sampling and measurement unit includes a sampling tube, a sampling electric cooler, and an analyzer. One end of the sampling tube is connected to a sampling hole, and the other end is connected in sequence to the sampling electric cooler and the analyzer. The analyzer is connected to an external drive system. The vacuum pumping unit includes a vacuum tube, a vacuum pump, and a vacuum solenoid valve. One end of the vacuum tube is connected to a vacuum port, and the other end is connected to the vacuum solenoid valve and the vacuum pump in sequence.

5. The fretting wear testing device under high-temperature gas environment as described in claim 1, characterized in that, Also includes: The limiting slot unit includes a positioning rod, a normal support block, tangential set screws, and a slot body. One end of the first normal transmission member and one end of the second normal transmission member respectively pass through the positioning rod on the slot body and are located at the upper end of the normal support block in the slot body. The sample fixture and the grinding pair fixture are both embedded in the limiting slot in the middle of the slot body. A pair of tangential set screws are provided on both sides of the slot body corresponding to the sample fixture.

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