Fretting wear experimental device and testing method in different high-temperature gas atmosphere environments

Abstract

According to the fretting wear experimental device for different high-temperature gas atmosphere environments, the temperature of the experimental environment is accurately regulated and controlled through the heating unit, and the stability of the experiment in the high-temperature environment is ensured. The fretting wear behavior of the sample in a real working environment can be accurately simulated through the control of the piezoelectric actuator; the inert gas control module is used for simulating oxidation, corrosion and other high-temperature environments possibly encountered in actual industrial application, so that the application range of the experiment is expanded; samples with different sizes and shapes, including steel wires, tubular samples and the like, can be fixed through the sample clamp and the opposite grinding pair clamp, so that the flexibility and the applicability of an experiment are greatly improved, and different experiment requirements are met; the temperature, normal force, friction force, vibration frequency and the like in the experiment process can be collected and monitored in real time through the data control module, real-time visualization and accurate recording of experiment results are provided, and follow-up data analysis and model establishment are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of fretting wear experimental devices, and in particular to a fretting wear experimental device and a testing method in different high-temperature gas atmosphere environments. Background Art

[0002] In many industrial fields, fretting wear is a common and non-negligible mechanical damage phenomenon, especially in mechanical parts in the fields of aerospace, energy, metallurgy and automobiles. Fretting wear is often an important factor leading to equipment failure and performance degradation. Fretting wear refers to a series of complex physical and chemical processes such as contact fatigue, oxidative wear, and friction damage caused by slight relative movement between two contact surfaces. As the operating temperature of the equipment increases, this phenomenon becomes more significant. Therefore, conducting research on fretting wear in high-temperature environments is of great significance for developing materials under high-temperature working conditions and designing high-temperature resistant mechanical parts. The fretting wear behavior of materials in high-temperature gas atmospheres may be very different from their wear mechanisms at room temperature, because high temperatures can cause a series of effects such as thermal expansion of materials, surface oxidation, and failure of lubricants. At the same time, different gas atmospheres (such as oxidizing, reducing or inert gases) will further change the surface reaction of the material, affecting the wear mode and degree of wear. Therefore, studying the fretting wear behavior in different high-temperature gas atmospheres has important technical value for predicting and extending the service life of equipment and optimizing material design.

[0003] However, there is a relative lack of experimental devices and methods for fretting wear testing in different high-temperature gas environments, especially for situations where precise control of multiple gas components and high-temperature stability are required. Most existing fretting wear test devices can only simulate wear behavior under normal temperature or limited atmosphere conditions, and cannot meet the research needs of various complex high-temperature gas environments. Summary of the invention

[0004] In response to the problems existing in the prior art, the present invention provides a micro-wear experimental device and a testing method for different high-temperature gas atmosphere environments to solve the technical problem that most of the prior art can only simulate the wear behavior under normal temperature or limited atmosphere conditions and cannot meet the research needs of various complex high-temperature gas environments.

[0005] The present invention provides a fretting wear test device in different high-temperature gas atmosphere environments, comprising:

[0006] A support frame, wherein a universal wheel is provided at the bottom and a wear test cavity is provided at the upper part, wherein the wear test cavity is respectively connected to an inert gas control module and a data control module, and the inert gas control module is connected to the data control module;

[0007] The wear test chamber is provided with 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 fixture and a grinding pair fixture. The tangential loading unit includes a piezoelectric actuator, a tangential transmission member and a tangential sealing connection member. The first normal loading unit includes a screw force applicator, a first normal sealing connection member and a first normal transmission member. The second normal loading unit includes a second normal sealing connection member and a second normal transmission member.

[0008] One side of the tangential transmission member is connected to one side of the sample fixture, and one end of the tangential transmission member is connected to a tangential sealing connection member and a piezoelectric actuator in sequence, the other side of the tangential transmission member is connected to one end of a first normal transmission member, the other end of the first normal transmission member is connected to a first normal sealing connection member and a screw force applicator in sequence, the other side of the sample fixture is connected to a side close to the grinding pair fixture, the other side of the grinding pair fixture is connected to one end of a second normal transmission member, the other end of the second normal transmission member is connected to a second normal sealing connection member, and the piezoelectric actuator and the screw force applicator are respectively connected to the data control module;

[0009] The heating unit comprises a heating rod and a thermocouple. The heating rod is arranged on the peripheral sides of the sample fixture and the grinding pair fixture. The thermocouple is arranged close to the heating rod and connected to the data control module.

[0010] Optionally, the tangential sealing connector, the first normal sealing connector and the second normal sealing connector all include:

[0011] One end of the tangential transmission member, the other end of the first normal transmission member or the other end of the second normal transmission member are sequentially sleeved with an inner jacket and one end of the inner jacket base from the inside to the outside, and one end of the tangential transmission member, the other end of the first normal transmission member or the other end of the second normal transmission member are fixedly connected to one end of the inner jacket base through an inner jacket pressing cap, a connecting chuck is sleeved on the circumference of the inner jacket base, one end of the bellows is connected to the other end of the inner jacket base, and an inner connecting sleeve, an inner supporting sleeve and an outer sealing sleeve are sequentially sleeved on the circumference of the other end of the inner jacket base from the inside to the outside, the other end of the bellows is connected to one end of the supporting sleeve and is fixed by an outer sleeve pressing nut, and the other end of the support sleeve is connected with an outer jacket pressing nut.

[0012] Optionally, one side of the tangential transmission member is connected to one side of the sample fixture, comprising:

[0013] The sample clamp comprises a tangential pull rod clamp, a sample base, and a sample pressing screw. The tangential pull rod clamp is fixed to one side of the tangential transmission member, and the sample base is detachably connected to the tangential pull rod clamp. The test sample is arranged inside the sample base and fixed by the sample pressing screw.

[0014] Optionally, the other side of the sample fixture is connected to one side of the grinding pair fixture, and the other side of the grinding pair fixture is connected to one end of the second normal transmission member, including:

[0015] A secondary sample is arranged inside the grinding pair fixture, and one side of the grinding pair fixture close to the secondary sample abuts against the other side of the sample fixture, and the other side of the grinding pair fixture away from the secondary sample is connected to one end of the second normal transmission member.

[0016] Optionally, the wear test chamber comprises:

[0017] The wear test cavity is formed by enclosing a metal plate, and a cavity is formed inside the metal plate. The heating unit, the clamping unit, the tangential loading unit, the first normal loading unit and the second normal loading unit are all arranged in the cavity. The cavity adopts an alumina ceramic fiber interlayer and a pressure-bearing boundary metal plate from the inside to the outside, and a movable door that penetrates into the cavity is opened on the front of the wear test cavity.

[0018] Optionally, the inert gas control module comprises:

[0019] Sampling and measuring unit, inert gas filling unit, inert gas exhaust unit and vacuum unit; the wear test cavity is provided with sampling holes, filling holes, vacuum holes and exhaust holes that penetrate into the cavity; the inert gas filling unit includes a bus, a pressure reducing valve, a flow controller, a gas distribution buffer tank, a safety valve and a gas charging solenoid valve; one end of the gas bus is connected to the gas tank respectively, and the other end thereof is collected at one end of the main gas pipeline; the other end of the main gas pipeline is connected to the filling hole, and the other end of the main gas pipeline is sequentially provided with the pressure reducing valve, flow controller, gas distribution buffer tank, safety valve and gas charging solenoid valve;

[0020] The inert gas exhaust unit comprises an exhaust pipe, an electric regulating valve, and an exhaust electric refrigerator, one end of the exhaust pipe is connected to the exhaust hole, and the other end is connected to the exhaust electric refrigerator, and the electric regulating valve is arranged on the exhaust pipe near the exhaust hole;

[0021] The sampling and measuring unit comprises a sampling tube, a sampling electric refrigerator and an analyzer, one end of the sampling tube is connected to the sampling hole, and the other end thereof is connected to the sampling electric refrigerator and the analyzer in sequence, and the analyzer is connected to the data control module;

[0022] The vacuum unit comprises a vacuum tube, a vacuum pump and a vacuum solenoid valve. One end of the vacuum tube is connected to the vacuum hole, and the other end is connected to the vacuum solenoid valve and the vacuum pump in sequence.

[0023] The present invention also provides a method for testing a fretting wear test device in different high-temperature gas atmosphere environments, comprising:

[0024] S1. Using the inert gas control module to evacuate the wear test chamber and inject the inert gas required for the experiment;

[0025] S2, placing the sample into the clamping unit and fixing it, and controlling the heating unit to heat it to the experimental temperature through the data control module;

[0026] S3. The data control module is used to drive the tangential loading unit and the first normal loading unit to start the fretting wear experiment, and the experimental parameters are recorded.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The temperature of the experimental environment is accurately controlled by the heating unit to ensure the stability of the experiment in a high temperature environment.

[0029] 2. The micro-motion wear behavior of the sample in the real working environment can be accurately simulated through the piezoelectric actuator control. The inert gas control module can be used to simulate the high-temperature environment such as oxidation and corrosion that may be encountered in actual industrial applications, expanding the application scope of the experiment.

[0030] 3. The sample fixture and grinding pair fixture can fix samples of different sizes and shapes, including steel wires, tubular samples, etc., which greatly improves the flexibility and applicability of the experiment and meets different experimental needs.

[0031] 4. The data control module can collect and monitor the temperature, normal force, friction force, vibration frequency, etc. during the experiment in real time, providing real-time visualization and accurate recording of experimental results, which is convenient for subsequent data analysis and model building. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1It is a structural schematic diagram of the support frame in the present invention;

[0035] Figure 2 It is a cross-sectional schematic diagram of the wear test cavity in the present invention;

[0036] Figure 3 It is a schematic structural diagram of a tangential loading unit, a first normal loading unit and a second normal loading unit in the present invention;

[0037] Figure 4 It is a structural schematic diagram of the sample fixture in the present invention;

[0038] Figure 5 It is a schematic diagram of the structure of the grinding pair fixture in the present invention;

[0039] Figure 6 It is a schematic diagram of the abutment between the sample fixture and the grinding pair fixture in the present invention;

[0040] Figure 7 It is a schematic diagram of any one of the tangential sealing connector, the first normal sealing connector and the second normal sealing connector in the present invention;

[0041] Figure 8 It is a structural schematic diagram of the bellows assembly method in the present invention;

[0042] Fig. 9 It is a structural schematic diagram of the assembly method of the jacket pressing cap in the present invention;

[0043] Fig.10 It is an overall schematic diagram of the fretting wear experimental device in the present invention;

[0044] Fig.11 It is a schematic diagram of the structure of the four-level seal in the present invention.

[0045] Description of reference numerals:

[0046] 1. Support frame; 2. Universal wheel; 201; Adjustable support foot; 3. Wear test chamber; 401. Sample fixture; 4011. Sample base; 4012. Tangential tie rod fixture; 4013. Sample pressing screw; 4014. Steel wire sample; 402. Grinding pair fixture; 4021. Upper fixture of pipe sample; 4022. Lower fixture of pipe sample; 4023. Pipe sample; 501. Piezoelectric actuator; 502. Tangential transmission member; 503. Tangential sealing connector; 601. Screw force applicator; 602. First normal sealing connector; 603. First normal transmission member; 604. Force sensor; 701. Second normal sealing connector; 702. Second normal transmission member; 801. Add Hot rod; 802, thermocouple; 901, inner jacket; 902, inner jacket base; 903, inner jacket pressure cap; 904, bellows; 905, inner connecting sleeve; 906, inner support sleeve; 907, outer sealing sleeve; 908, inner retaining ring; 909, support sleeve; 910, outer retaining ring; 911, outer sleeve clamping nut; 912, outer jacket clamping nut; 913, connecting chuck; 914, outer jacket; 915, outer jacket base; 916, piezoelectric actuator support sleeve; 1001, alumina ceramic fiber interlayer; 1002, pressure-bearing boundary metal plate; 1003, chamber; 1011, sampling hole; 1012, charging hole; 1013, vacuum hole; 1014, exhaust hole. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The functional units with the same labels in the examples of the present invention have the same and similar structures and functions.

[0048] See also Figure 1 The present invention provides a fretting wear test device in different high-temperature gas atmosphere environments, comprising:

[0049] A support frame 1, a universal wheel 2 is provided at the bottom thereof, and a wear test chamber 3 is provided at the upper portion thereof, wherein the wear test chamber 3 is respectively connected to an inert gas control module and a data control module, and the inert gas control module is connected to the data control module;

[0050] The wear test chamber 3 is provided with 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 fixture 401 and a grinding pair fixture 402. The tangential loading unit includes a piezoelectric actuator 501, a tangential transmission member 502 and a tangential sealing connection member 503. The first normal loading unit includes a screw force applicator 601, a first normal sealing connection member 602 and a first normal transmission member 603. The second normal loading unit includes a second normal sealing connection member 701 and a second normal transmission member 702.

[0051] One side of the tangential transmission member 502 is connected to one side of the sample fixture 401, and one end of the tangential transmission member 502 is connected to the tangential sealing connection member 503 and the piezoelectric actuator 501 in sequence, the other side of the tangential transmission member 502 is connected to one end of the first normal transmission member 603, the other end of the first normal transmission member 603 is connected to the first normal sealing connection member 602 and the screw force applicator 601 in sequence, the other side of the sample fixture 401 is connected to a side close to the grinding pair fixture 402, the other side of the grinding pair fixture 402 is connected to one end of the second normal transmission member 702, the other end of the second normal transmission member 702 is connected to the second normal sealing connection member 701, and the piezoelectric actuator 501 and the screw force applicator 601 are respectively connected to the data control module;

[0052] The heating unit includes a heating rod 801 and a thermocouple 802 . The heating rod 801 is disposed around the sample fixture 401 and the grinding pair fixture 402 . The thermocouple 802 is disposed close to the heating rod 801 and connected to the data control module.

[0053] In this embodiment, the upper part of the unit of the micro-motion wear experimental device is set as a wear experimental chamber 3, which is fixed on a metal support frame 1 with universal wheels 2 at the bottom for easy transportation, and adjustable supporting feet with cushions are installed next to the universal wheels 2 to fix the experimental device, so as to minimize the impact of external vibration on the experimental device when conducting experiments.

[0054] The wear test cavity 3 is formed by enclosing a metal plate, and a cavity 1003 is formed inside the cavity 1003. The heating unit, the clamping unit, the tangential loading unit, the first normal loading unit and the second normal loading unit are all arranged in the cavity 1003. The cavity 1003 adopts an alumina ceramic fiber interlayer 1001 and a pressure-bearing boundary metal plate 1002 from the inside to the outside. Alumina ceramic fiber materials are used to reduce heat loss and ensure the stability of the high-temperature environment. A movable door that runs through the cavity 1003 is provided on the front of the wear test cavity 3. The movable door can be in the form of a single door and sealed by a lock. High-temperature resistant sealing materials are used at the furnace door and other joints to ensure airtightness and prevent gas leakage and infiltration of outside air.

[0055] The wear test chamber 3 is provided with 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 fixture 401 and a grinding pair fixture 402. In this embodiment, the sample fixture 401 and the grinding pair fixture 402 are exemplified as a steel wire sample 4014 fixture and a tube sample fixture, which can realize the fixation of tube samples 4023 and steel wire samples 4014 of different lengths and different outer diameters. The tangential loading unit includes a piezoelectric actuator 501, a tangential transmission member 502, and a tangential sealing connector 503. The first normal loading unit includes a screw force applicator 601, a first normal sealing connector 602, and a first normal transmission member 603. The second normal loading unit includes a second normal sealing connector 701 and a second normal transmission member 702.

[0056] One side of the tangential transmission member 502 is connected to one side of the sample fixture 401, and one end of the tangential transmission member 502 is connected to the tangential sealing connector 503 and the piezoelectric actuator 501 in sequence, the other side of the tangential transmission member 502 is connected to one end of the first normal transmission member 603, the other end of the first normal transmission member 603 is connected to the first normal sealing connector 602 and the screw force applicator 601 in sequence, the other side of the sample fixture 401 is connected to a side close to the grinding pair fixture 402, the other side of the grinding pair fixture 402 is connected to one end of the second normal transmission member 702, the other end of the second normal transmission member 702 is connected to the second normal sealing connector 701, and the piezoelectric actuator 501 and the screw force applicator 601 are respectively connected to the data control module.

[0057] Among them, the steel wire sample 4014 includes a tangential pull rod clamp 4012, a sample base 4011, and a sample pressing top screw 4013 through a clamp. The tangential pull rod clamp 4012 is fixed to one side of the tangential transmission member 502, and the steel wire sample base 4011 is detachably connected to the tangential pull rod clamp 4012. The test sample is arranged inside the steel wire sample base 4011 and is fixed by the sample pressing top screw 4013.

[0058] The tube sample clamp is implemented by the tube sample upper clamp 4021 and the tube sample lower clamp 4022. The tube sample upper clamp 4021 and the tube sample lower clamp 4022 clamp each other to fix the tube sample 4023, and is fixed to one end of the second normal transmission member 702 by a screw.

[0059] Since the tangential transmission member 502 is connected to the tangential sealing connection member 503, the tangential sealing connection member 503 drives the steel wire sample 4014 fixture on the tangential transmission member 502 to slide tangentially. In the first normal loading unit, the screw force applicator 601 is used to apply a constant normal load through the connected first normal sealing connection member 602, and the normal force is transmitted through the first normal transmission member 603. The second normal sealing connection member 701 is connected to the tube sample fixture through the second normal transmission member 702, so that the tube sample fixture abuts against the steel wire sample 4014 fixture. The transmitted normal force makes the steel wire sample 4014 fixture and the tube sample fixture touch and bear the normal load, and then the fretting abrasion characteristics experimental study under different normal loads is carried out.

[0060] The piezoelectric actuator 501 connected to one end of the tangential sealing connector 503 away from the tangential transmission member 502 outputs a push-pull force of a certain frequency. The push-pull force drives the steel wire sample 4014 fixture to achieve a tangential displacement of 0 to 200 μm through the tangential sealing connector 503. Different piezoelectric actuators 501 can be replaced according to actual needs, which can achieve both normal force and normal impact. Different excitation modes can be achieved through control, including sine (cosine), triangle wave, and random wave, with a frequency of 0 to 100 Hz. The sealing connection structure is consistent, easy to replace, and has the characteristic of easy expansion.

[0061] In the first normal loading unit, the screw force applicator 601 connected to one end of the first normal sealing connection 602 away from the first normal transmission member 603 outputs the normal preload through the first normal sealing connection 602 and the first normal transmission member 603, and a force sensor 604 can be set for real-time monitoring, with a monitoring range of 0 to 200 N. By applying the normal load, the tube sample 4023 and the steel wire sample 4014 are compressed, wherein the tube sample 4023 is fixed, and the steel wire sample 4014 reciprocates at a predetermined frequency and amplitude under the action of the tangential loading unit.

[0062] In order to ensure the reliability of the experiment, the airtightness of the system must be ensured to prevent external air from entering or internal gas from leaking, so as to ensure the accuracy and safety of the test. Since the loading unit involves dynamic sealing and has a high-temperature boundary, a multi-level labyrinth seal from outside to inside is adopted. Therefore, the tangential sealing connector 503, the first normal sealing connector 602 and the second normal sealing connector 701 all include:

[0063] One end of the tangential transmission member 502, the other end of the first normal transmission member 603 or the other end of the second normal transmission member 702 are sequentially sleeved with an inner jacket 901 and one end of an inner jacket base 902 from the inside to the outside, and one end of the tangential transmission member 502, the other end of the first normal transmission member 603 or the other end of the second normal transmission member 702 is fixedly connected to one end of the inner jacket base 902 through an inner jacket pressing cap 903, and a connecting chuck 913 is sleeved on the circumferential side of the inner jacket base 902. At this time, the inner jacket pressing cap 903 and the connecting chuck 913 form a primary seal, blocking the connection between the inside and outside of the wear test chamber 3; one end of the bellows 904 is connected to the other end of the inner jacket base 902, and the inner jacket base 902 is sealed. The other end of the inner jacket base 902 is sequentially sleeved with an inner connecting sleeve 905, an inner supporting sleeve 906 and an outer sealing sleeve 907 from the inside to the outside, and an inner retaining ring 908 for strengthening the seal is also provided at the junction between the outer sealing sleeve 907 and the inner jacket base 902. At this time, one end of the bellows 904 forms a secondary seal through the outer sealing tube; the other end of the bellows 904 is connected to one end of the supporting sleeve and is fixed by an outer retaining ring 910 and an outer sleeve clamping nut 911. Since the bellows 904 is similar to a spring, the outer sleeve clamping nut 911 tightly presses the bellows 904. The outer retaining ring 910 is used to improve the sealing effect. The inner connecting sleeve 905 realizes a three-level seal with the cooperation of the outer jacket clamping nut 912; see Fig.11 In the tangential loading unit, since the jacket is similar to a conical structure with a gap on it, the piezoelectric actuator 501 is cylindrical and is connected to the other end of the piezoelectric actuator support sleeve 916 through the holes of the outer jacket clamping nut 912 and the outer jacket 914. The outer jacket clamping nut 912 is fixed on the outer jacket base 915. The tighter it is screwed, the tighter the cone fit between the outer jacket 914 and the outer jacket clamping nut 912, and the smaller the gap of the outer jacket 914, the tighter the piezoelectric actuator 501 is clamped, and the fourth-level sealing is achieved by reducing the gap.

[0064] In the heating unit, the heating rod 801 is preferably a silicon carbon rod. The heating rod 801 can be set on the left and right rear three sides of the sample fixture 401 and the grinding pair fixture 402. The temperature inside the test unit is adjusted by the connected data control module. The PID temperature control adopts a program temperature controller, and the temperature intelligent adjustment range is 20 to 1200°C. The data control module heats the test unit to a specified temperature by controlling the electric heating method of the silicon carbon rod. The core of the heating unit is the built-in electric heating rod 801 and the platinum-rhodium thermocouple 802. The temperature inside the experimental cavity is collected by the platinum-rhodium thermocouple 802, and then fed back to the data control module. The data control module controls the current output to the electric heating rod 801 to achieve precise temperature control. Each electric heating unit can control the heating power individually to ensure that the system can accurately simulate different temperature conditions.

[0065] The inert gas control module includes a sampling and measuring unit, an inert gas charging unit, an inert gas exhaust unit and a vacuum unit; the wear test chamber 3 is provided with a sampling hole 1011, a charging hole 1012, a vacuum hole 1013 and an exhaust hole 1014 that penetrate into the chamber 1003;

[0066] The inert gas charging unit includes a gas bus, a pressure reducing valve, a flow controller, a gas distribution buffer tank, a safety valve, and a charging solenoid valve. One end of the gas bus is connected to different gas tanks to ensure a continuous and stable gas supply. The gas tanks can be flexibly switched through the bus to ensure that there is no need to interrupt the gas supply after a single gas tank is used up. Each gas tank has multiple gas tanks for gas supply to ensure sufficient gas reserves. The other end converges at one end of the main gas pipeline, and the other end of the main gas pipeline is connected to the charging hole 1012, and the other end of the main gas pipeline is sequentially provided with the pressure reducing valve, flow controller, gas distribution buffer tank, safety valve and charging solenoid valve;

[0067] Among them, the pressure reducing valve is mainly used to reduce the gas pressure in the high-pressure gas tank to the working pressure required for the experiment. This process ensures that the gas is supplied to the downstream at a stable and safe pressure.

[0068] The flow controller can mainly adjust the gas supply according to the experimental requirements to ensure that the gas concentration or pressure is maintained at the set value. The flow controller is usually connected to the control system through electronic signals to monitor and adjust the flow in real time;

[0069] The gas distribution buffer tank mainly plays the role of stabilizing the gas flow. After the gas enters the system from multiple gas tanks through the bus and pressure reducing valve, the gas flow may fluctuate or pulsate. The buffer tank can absorb these unstable fluctuations to ensure that the gas flow received by the downstream equipment is more stable.

[0070] The safety valve is a key protection device in the system, used to prevent the system from overpressure. If the gas pressure in the tank exceeds the set safety value, the safety valve will automatically open and release excess gas to avoid damage to the equipment or safety accidents. The system is equipped with a drain valve to discharge residual gas or exhaust gas in the pipeline when needed. When switching gases or overhauling the system, the drain valve can be used to quickly empty the residual gas in the pipeline to prevent gas residue from affecting subsequent experiments. The solenoid valve can automatically open or close according to the instructions of the control system to control the flow of gas. In this way, the solenoid valve can accurately control the filling and stopping of gas, so that the system can flexibly adjust the gas supply according to experimental needs. When the gas supply needs to be started, the solenoid valve opens; when the gas supply is not needed or needs to be stopped, the solenoid valve closes. The electric regulating valve can accurately adjust the flow of gas by controlling the opening of the valve.

[0071] The inert gas exhaust unit includes an exhaust pipe, an electric regulating valve, and an exhaust electric refrigerator. The exhaust flow of the inert gas exhaust unit directly affects the exhaust speed and the air pressure balance in the test unit. One end of the exhaust pipe is connected to the exhaust hole 1014, and the other end is connected to the exhaust electric refrigerator. The electric regulating valve is arranged on the exhaust pipe close to the exhaust hole 1014. Through the flexible adjustment of the electric regulating valve, the flow rate during the exhaust process can be ensured to be stable and controllable, avoiding the sudden exhaust of gas too fast or too slow. At the same time, it is connected to the data control module, which can dynamically adjust the gas exhaust rate to ensure that the pressure in the system is gradually reduced to avoid sudden pressure changes or too fast gas release.

[0072] The sampling and measuring unit includes a sampling tube, a sampling electric refrigerator and an analyzer. One end of the sampling tube is connected to the sampling hole 1011, and the other end thereof is connected to the sampling electric refrigerator and the analyzer in sequence. The analyzer is connected to the data control module. The analyzer can use an oxygen concentration analyzer to monitor the oxygen content in the gas in the cavity, and can determine the content of the inert gas component in the experimental cavity, and feed back the collected gas composition data to the data control module, and the data control module outputs a signal to continuously adjust the valve, so as to simulate different gas atmosphere environments;

[0073] The vacuum unit comprises a vacuum tube, a vacuum pump and a vacuum solenoid valve. One end of the vacuum tube is connected to the vacuum tube, and the other end thereof is connected to the vacuum solenoid valve and the vacuum pump in sequence.

[0074] The data control module includes a data acquisition system and a data control system (computer). The data acquisition system has a built-in data acquisition program. Through the aforementioned various sensors, it regularly collects key data such as flow, pressure, temperature, oxygen content, normal force, friction, excitation frequency, and displacement amplitude. By editing the collected data once, it can realize the visual output of abrasive power, etc., and can display the friction-displacement amplitude curve. The data control system uses control software to set experimental parameters, start and stop experiments, and record and analyze experimental data. The control system can not only realize real-time monitoring, but also long-term data recording, which is convenient for subsequent analysis and visualization. Based on the above components, micro-motion wear tests can be carried out to simulate the real service environment, thereby providing data support for exploring the micro-motion wear mechanism in a high-temperature gas atmosphere and establishing a micro-motion wear prediction model.

[0075] The present invention uses the device to accurately control the micro-displacement of the sample through the piezoelectric actuator 501, and the displacement range can reach 0 to 200 μm, which can accurately simulate the micro-displacement wear behavior of the material in a real working environment, especially in the study of micro-displacement friction characteristics under high temperature conditions and complex gas atmospheres;

[0076] Moreover, through the inert gas filling and exhaust unit, the system can conduct experiments under different gas atmospheres, simulating high-temperature environments such as oxidation and corrosion that may be encountered in actual industrial applications, thus expanding the application scope of the experiment;

[0077] Secondly, the heating unit can accurately control the temperature of the experimental environment (ranging from 20 to 1200°C) to ensure the stability of the experiment in a high temperature environment, and the heating rod 801 in the heating unit can be independently controlled to achieve precise adjustment of multiple temperature zones;

[0078] Then, through the adjustable clamp, the device can fix specimens of different sizes and shapes, including steel wires, tubular specimens, etc., which greatly improves the flexibility and applicability of the experiment and meets different experimental needs.

[0079] Finally, the data control module can collect and monitor key data including temperature, normal force, friction, vibration frequency, displacement, etc. in real time, generate friction-displacement curve, provide real-time visualization and accurate recording of experimental results, and facilitate subsequent data analysis and model building.

[0080] The present invention also provides a method for testing a fretting wear test device in different high-temperature gas atmosphere environments, comprising:

[0081] S1. Use the inert gas control module to evacuate the wear test chamber 201; adjustable support feet; 3, and inject the inert gas required for the experiment;

[0082] S2, placing the sample into the clamping unit and fixing it, and controlling the heating unit to heat it to the experimental temperature through the data control module;

[0083] S3. The data control module is used to drive the tangential loading unit and the first normal loading unit to start the fretting wear experiment, and the experimental parameters are recorded.

[0084] In this embodiment, at the beginning of the experiment, firstly, a test is performed to ensure that all system instruments display normally, including temperature, pressure, oxygen concentration, normal force, etc., and then the system is evacuated multiple times by a vacuum pump to expel the air therein, and then the inert gas filling and exhaust unit is started to inject the inert gas required for the experiment. If necessary, the vacuum is pumped again and the inert gas is repeatedly injected. By monitoring the oxygen concentration of the gas in the cavity, the content of the inert gas component in the experimental cavity can be determined.

[0085] Start the heating unit and heat the test unit to the specified temperature by electric heating. Each can be controlled separately to ensure that the system can simulate different temperature conditions. The core of the heating unit is the built-in electric heating rod 801 and thermocouple 802, which can achieve precise temperature control by controlling the current. Until the pre-experimental temperature is reached, as the temperature rises, the pressure in the wear test cavity 201; adjustable support feet; 3 increases. When the pressure is too high, the pressure relief valve is started, which can be automatically adjusted by the computer. When the pressure, temperature and atmosphere in the cavity meet the experimental requirements, the micro-motion abrasion test machine is started, and the corresponding normal force, displacement amplitude and vibration frequency are output according to the experimental working condition parameters, and adjusted to the preset working condition to carry out the micro-motion abrasion test. During the test, the system monitors and records parameters such as temperature, pressure, oxygen concentration, filling and exhaust flow, normal force, displacement amplitude, vibration frequency, etc., and can be remotely controlled when necessary to ensure the smooth progress of the test.

[0086] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0087] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fretting wear test device in different high temperature gas atmosphere environments, characterized in that: include: A support frame, wherein a universal wheel is provided at the bottom and a wear test cavity is provided at the upper part, wherein the wear test cavity is respectively connected to an inert gas control module and a data control module, and the inert gas control module is connected to the data control module; The wear test chamber is provided with 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 fixture and a grinding pair fixture. The tangential loading unit includes a piezoelectric actuator, a tangential transmission member and a tangential sealing connection member. The first normal loading unit includes a screw force applicator, a first normal sealing connection member and a first normal transmission member. The second normal loading unit includes a second normal sealing connection member and a second normal transmission member. One side of the tangential transmission member is connected to one side of the sample fixture, and one end of the tangential transmission member is connected to a tangential sealing connection member and a piezoelectric actuator in sequence, the other side of the tangential transmission member is connected to one end of a first normal transmission member, the other end of the first normal transmission member is connected to a first normal sealing connection member and a screw force applicator in sequence, the other side of the sample fixture is connected to a side close to the grinding pair fixture, the other side of the grinding pair fixture is connected to one end of a second normal transmission member, the other end of the second normal transmission member is connected to a second normal sealing connection member, and the piezoelectric actuator and the screw force applicator are respectively connected to the data control module; The heating unit comprises a heating rod and a thermocouple. The heating rod is arranged on the peripheral sides of the sample fixture and the grinding pair fixture. The thermocouple is arranged close to the heating rod and connected to the data control module.

2. The fretting wear test device in different high temperature gas atmosphere environments as claimed in claim 1 is characterized in that: The tangential sealing connector, the first normal sealing connector and the second normal sealing connector all include: One end of the tangential transmission member, the other end of the first normal transmission member or the other end of the second normal transmission member are sequentially sleeved with an inner jacket and one end of the inner jacket base from the inside to the outside, and one end of the tangential transmission member, the other end of the first normal transmission member or the other end of the second normal transmission member are fixedly connected to one end of the inner jacket base through an inner jacket pressing cap, a connecting chuck is sleeved on the circumference of the inner jacket base, one end of the bellows is connected to the other end of the inner jacket base, and an inner connecting sleeve, an inner supporting sleeve and an outer sealing sleeve are sequentially sleeved on the circumference of the other end of the inner jacket base from the inside to the outside, the other end of the bellows is connected to one end of the supporting sleeve and is fixed by an outer sleeve pressing nut, and the other end of the support sleeve is connected with an outer jacket pressing nut.

3. The fretting wear test device in different high temperature gas atmosphere environments as claimed in claim 1, characterized in that: One side of the tangential transmission member is connected to one side of the sample fixture, comprising: The sample clamp comprises a tangential pull rod clamp, a sample base, and a sample pressing screw. The tangential pull rod clamp is fixed to one side of the tangential transmission member, and the sample base is detachably connected to the tangential pull rod clamp. The test sample is arranged inside the sample base and fixed by the sample pressing screw.

4. The fretting wear test device in different high temperature gas atmosphere environments as claimed in claim 1, characterized in that: The other side of the sample fixture is connected to one side of the grinding pair fixture, and the other side of the grinding pair fixture is connected to one end of the second normal transmission member, including: A secondary sample is arranged inside the grinding pair fixture, and one side of the grinding pair fixture close to the secondary sample abuts against the other side of the sample fixture, and the other side of the grinding pair fixture away from the secondary sample is connected to one end of the second normal transmission member.

5. The fretting wear test device in different high temperature gas atmosphere environments as claimed in claim 1, characterized in that: The wear test chamber comprises: The wear test cavity is formed by enclosing a metal plate, and a cavity is formed inside the metal plate. The heating unit, the clamping unit, the tangential loading unit, the first normal loading unit and the second normal loading unit are all arranged in the cavity. The cavity adopts an alumina ceramic fiber interlayer and a pressure-bearing boundary metal plate from the inside to the outside, and a movable door that penetrates into the cavity is opened on the front of the wear test cavity.

6. The fretting wear test device in different high temperature gas atmosphere environments as claimed in claim 5, characterized in that: The inert gas control module comprises: Sampling and measuring unit, inert gas charging unit, inert gas exhaust unit and vacuum unit; the wear test cavity is provided with sampling holes, charging holes, vacuum holes and exhaust holes that penetrate into the cavity; the inert gas charging unit includes a bus, a pressure reducing valve, a flow controller, a gas distribution buffer tank, a safety valve and a charging solenoid valve; one end of the bus is connected to the gas tank respectively, and the other end thereof is collected at one end of the main gas pipeline; the other end of the main gas pipeline is connected to the charging hole, and the other end of the main gas pipeline is provided with the pressure reducing valve, flow controller, gas distribution buffer tank, safety valve and charging solenoid valve in sequence; The inert gas exhaust unit comprises an exhaust pipe, an electric regulating valve, and an exhaust electric refrigerator, one end of the exhaust pipe is connected to the exhaust hole, and the other end is connected to the exhaust electric refrigerator, and the electric regulating valve is arranged on the exhaust pipe near the exhaust hole; The sampling and measuring unit comprises a sampling tube, a sampling electric refrigerator and an analyzer, one end of the sampling tube is connected to the sampling hole, and the other end thereof is connected to the sampling electric refrigerator and the analyzer in sequence, and the analyzer is connected to the data control module; The vacuum unit comprises a vacuum tube, a vacuum pump and a vacuum solenoid valve. One end of the vacuum tube is connected to the vacuum hole, and the other end is connected to the vacuum solenoid valve and the vacuum pump in sequence.

7. A testing method using the fretting wear test device in different high temperature gas atmosphere environments as claimed in claim 1, characterized in that: include: S1. Using the inert gas control module to evacuate the wear test chamber and inject the inert gas required for the experiment; S2, placing the sample into the clamping unit and fixing it, and controlling the heating unit to heat it to the experimental temperature through the data control module; S3. The data control module is used to drive the tangential loading unit and the first normal loading unit to start the fretting wear experiment, and the experimental parameters are recorded.

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