Fretting wear test device in high-temperature gas environment

Abstract

According to the fretting wear test device in the high-temperature gas environment, the double-layer test cavity capable of simulating the high-temperature gas environment is designed, high temperature, gas components and pressure conditions are adjusted through the heating unit and the gas control module, and it is ensured that the test is conducted under the condition close to the actual service condition; by loading different normal forces, high frequency and variable displacement amplitude, fretting wear behaviors in a high-temperature gas environment are simulated so as to research the wear characteristics between the sample and a wear pair, and meanwhile, high-temperature-resistant materials such as a double-layer shell structure and a high-purity alumina fiber material are adopted, so that the double-layer test cavity can bear the high-temperature environment, and the wear resistance of the sample is improved. And heat is effectively isolated to ensure operation safety. And finally, the temperature and the air pressure in the test cavity are monitored in real time through a heating piece and an external driving system, so that the temperature and the pressure in the test process are stabilized in a set range, and damage to equipment caused by overheating or overpressure is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of fretting wear test, and in particular to a fretting wear test device in a high-temperature gas environment. Background Art

[0002] In industrial equipment, especially in high-temperature gas environments, equipment components are often stimulated by fluid media, causing micro-motion wear, which affects their service life and reliability. In such high-temperature environments, how to simulate high-temperature micro-motion wear of equipment components is a current problem. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a micro-motion wear test device in a high-temperature gas environment to solve the current technical problem of how to simulate high-temperature micro-motion wear of equipment components in such a high-temperature environment, which is lacking in the prior art.

[0004] See also Figure 1 and Figure 2 The present invention provides a fretting wear test device in a high-temperature gas environment, comprising:

[0005] A double-layer test chamber, which uses an alumina ceramic fiber interlayer and a pressure-bearing boundary metal plate from the inside to the outside, and a movable door that penetrates to the chamber is opened on the front of the double-layer test chamber, and the double-layer test chamber is respectively connected to a gas control module and an external drive system;

[0006] The double-layer test cavity is provided with a limit 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 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.

[0007] 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 the tangential sealing connection member and the piezoelectric actuator in sequence, the other side of the tangential transmission member is connected to one end of the first normal transmission member, the other end of the first normal transmission member is connected to the first normal sealing connection member and the 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 the second normal transmission member, the other end of the second normal transmission member is connected to the second normal sealing connection member, and the piezoelectric actuator and the screw force applicator are respectively connected to an external drive system;

[0008] The heating unit comprises a heating element and a thermocouple. The heating element is arranged on the peripheral sides of the sample fixture and the grinding pair fixture. The thermocouple is arranged close to the heating element and connected to an external driving system.

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

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

[0011] One end of the inner jacket is connected to the transmission member, and the other end thereof is connected to one end of the inner jacket base. The inner jacket pressure cap is sleeved on the circumference of the inner jacket, and a sealing outer sleeve, an inner retaining ring and an inner support sleeve are sequentially arranged on the circumference of the inner jacket base. One end of the connecting chuck is connected to the sealing outer sleeve through the inner support sleeve and the inner retaining ring in sequence.

[0012] One end of the bellows is connected to the other end of the inner jacket base through a connector, the outer connecting sleeve is sleeved on the circumferential side of the bellows, one end of the outer connecting sleeve is connected to the other end of the connecting chuck, and the other end thereof is sleeved with an outer sleeve nut, one end of the connecting rod passes through the outer sleeve nut to connect the other end of the bellows, and the other end thereof passes through an outer retaining ring and an outer supporting sleeve in sequence to connect to the connecting rod end cover, and the outer retaining ring and the outer supporting sleeve are sleeved with an outer jacket base on the outside, one end of the outer jacket base is connected to the outer jacket nut, and the other end thereof is connected to the outer jacket pressing nut through the outer jacket.

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

[0014] 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.

[0015] 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:

[0016] 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.

[0017] Optionally, the gas control module comprises:

[0018] Sampling and measuring unit, gas filling unit, gas exhaust unit and vacuum unit; the double-layer test chamber is provided with sampling holes, filling holes, vacuum holes and exhaust holes that penetrate into the chamber, the 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, 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;

[0019] The 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;

[0020] 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 an external driving system;

[0021] 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.

[0022] Optionally, it also includes:

[0023] The limiting slot unit comprises a positioning rod, a normal support block, a tangential top screw 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 arranged 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. The slot body is provided with a pair of tangential top screws on both sides corresponding to the sample fixture.

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

[0025] 1. A double-layer test chamber that can simulate a high-temperature gas environment is designed. The high temperature, gas composition and pressure conditions are adjusted through the heating unit and the gas control module to ensure that the test is carried out under conditions close to the actual service conditions.

[0026] 2. By loading different normal forces, high frequencies, and variable displacement amplitudes, the fretting wear behavior in a high-temperature gas environment is simulated to study the wear characteristics between the specimen and the grinding pair.

[0027] 3. The double-layer shell structure, high-purity alumina fiber materials and other high-temperature resistant materials are adopted to enable the double-layer test chamber to withstand high temperature environment and effectively isolate heat to ensure safe operation.

[0028] 4. The temperature and air pressure in the test chamber are monitored in real time through the heating element and the external drive system to ensure that the temperature and pressure are stable within the set range during the experiment to avoid damage to the equipment due to overheating or overpressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] 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.

[0031] Figure 1 Schematic diagram of the cross-sectional structure of the double-layer test chamber in the present invention;

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

[0034] Figure 4 It is a schematic structural diagram of a tangential sealing connector, a first normal sealing connector and a second normal sealing connector in the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the sample fixture in the present invention;

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

[0037] Figure 7 It is a schematic diagram of the abutment between the sample fixture and the grinding pair fixture in the present invention;

[0038] Figure 8 It is a structural schematic diagram of the position limiting slot unit in the present invention;

[0039] Fig. 9 It is a schematic diagram of the overall structure of the present invention including a sampling and measuring unit, a gas filling unit, a gas exhaust unit and a vacuum unit.

[0040] Description of reference numerals:

[0041] 1. Double-layer test chamber; 11. Heating element; 12. Thermocouple; 13. Sampling hole; 14. Inflating hole; 15. Vacuum hole; 16. Exhaust hole; 101. Tangential transmission element; 102. Tangential sealing connector; 201. Screw force applicator; 202. First normal sealing connector; 203. First normal transmission element; 301. Second normal sealing connector; 302. Second normal transmission element; 401. Positioning rod; 402. Normal support block; 403. Tangential top screw; 404. Slot body; 501. Inner jacket; 502. Inner jacket base; 503 , inner jacket pressure cap; 504, sealing outer sleeve; 505, connector; 506, inner retaining ring; 507, connecting chuck; 508, bellows; 509, outer connecting sleeve; 510, inner support sleeve; 511, outer sleeve nut; 512, connecting rod; 513, connecting rod end cover; 514, outer retaining ring; 515, outer support sleeve; 516, outer jacket; 517, outer jacket base; 518, outer jacket clamping nut; 601, specimen fixture; 602, grinding pair fixture; 603, tangential pull rod fixture; 604, specimen base; 605, specimen clamping top screw. DETAILED DESCRIPTION

[0042] 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.

[0043] See also Figure 1 , Figure 2 and Figure 3 The present invention provides a fretting wear test device in a high-temperature gas environment, comprising:

[0044] A double-layer test chamber 1, which uses an alumina ceramic fiber interlayer and a pressure-bearing boundary metal plate from the inside to the outside, and a movable door that penetrates to the chamber is opened on the front of the double-layer test chamber 1, and the double-layer test chamber 1 is respectively connected to a gas control module and an external drive system;

[0045] The double-layer test chamber 1 is provided with a limit 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 fixture 601 and a grinding pair fixture 602. The tangential loading unit includes a piezoelectric actuator, a tangential transmission member 101, and a tangential sealing connection member 102. The first normal loading unit includes a screw force applicator 201, a first normal sealing connection member 202, and a first normal transmission member 203. The second normal loading unit includes a second normal sealing connection member 301 and a second normal transmission member 302.

[0046] One side of the tangential transmission member 101 is connected to one side of the sample fixture 601, and one end of the tangential transmission member 101 is connected to the tangential sealing connection member 102 and the piezoelectric actuator in sequence, 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 connected to the first normal sealing connection member 202 and the screw force applicator 201 in sequence, the other side of the sample fixture 601 is connected to a side close to the grinding pair fixture 602, the other side of the grinding pair fixture 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 connection member 301, and the piezoelectric actuator and the screw 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 arranged around the sample fixture 601 and the grinding pair fixture 602 . The thermocouple 12 is arranged close to the heating element 11 and connected to an external driving system.

[0048] In this embodiment, the double-layer test chamber 1 adopts an integrated design with a single door in the front, which is easy to operate and convenient for loading and unloading samples. The sealing is achieved by a lock, and the furnace door and other joints are sealed with ceramic fiber high-temperature resistant materials to ensure airtightness and prevent gas leakage and infiltration of outside air. The overall double-layer shell structure is adopted, that is, the inner furnace forms a chamber, and the furnace chamber can be set to 200mm long, 150mm wide and 150mm high. It is made of high-purity alumina polycrystalline fiber materials and new materials such as anti-infrared thermal radiation, and can withstand a high temperature of up to 1400℃. The furnace is vacuum-formed and ultra-high temperature calcined, and the inner surface of the furnace is coated with a high-temperature resistant heat insulation coating, which can effectively prevent ash from falling; the middle interlayer is filled with alumina fiber insulation material to reduce heat loss and ensure the stability of the high-temperature environment; the outer side is the pressure-bearing boundary, that is, the furnace shell, which adopts a double-layer structure integrated design. The inner layer of the furnace shell is made of thickened cold-rolled plate welded by a special process, which can withstand high temperature and high pressure. The outer surface of the furnace shell is treated with rust-proof and high-temperature resistant paint. Square steel can also be added around the shell to further strengthen the structure. The double-layer shell structure is used to ensure that the shell temperature rise is below 30 degrees Celsius when the internal temperature is high. In addition, the movable metal cover plate is detachably encapsulated as a whole, which is convenient for inspection and maintenance.

[0049] See also Figure 1 The heating rods are made of high-quality U-shaped silicon carbon rods, which are respectively located on the left and right rear sides of the sample fixture 601 and the grinding pair fixture 602 for heating. They can achieve heating from 0 to 1200°C, with strong heat radiation and durability. The temperature is controlled by a program through an external drive system, and the temperature is precisely controlled by controlling the current of the heating element. Each heating rod can be controlled separately, and the 30-stage heating and cooling program can be programmed step by step to realize automatic heating and cooling. The artificial intelligence PID adjustment algorithm and the thyristor control method can be connected to an external control panel including a digital display program temperature controller, a voltmeter, an ammeter, a power switch, and a start-stop button. The external drive system can also be equipped with alarm protection functions such as over-temperature, temperature deviation, leakage, and circuit breaker to automatically cut off the heating power supply.

[0050] See also Figure 1 , the thermocouple 12 adopts a platinum-rhodium S-type thermocouple 12, which is used to measure the internal temperature of the double-layer test cavity 1 in real time, and can achieve 0-1300 degrees Celsius measurement with a measurement error of ±1°C. It mainly includes a junction box, a cold end, a flange, etc. The outer tube material is corundum, and it is connected to the double-layer test cavity 1 by a flange connection method. The total length can be set to 420mm, the outer diameter of the porcelain tube is 7mm, and the porcelain tube material is high aluminum. There are 4 measuring points arranged in the double-layer test cavity 1, two of which are located near the double-layer test cavity 1, and two are used to measure the surrounding gas temperature. It is led out from the upper side of the double-layer test cavity 1. For safety, an over-temperature protection device is installed to prevent excessive temperature from damaging the equipment or causing safety accidents. The thermocouple 12 converts the collected physical signal into a weak electrical signal. The weak electrical signal is converted into a standard electrical signal of 4-20mV after linearization processing by the signal amplifier. The acquisition card reads the standard signal and converts its result into a physical signal, which is displayed in real time on the control panel display window of the external drive system.

[0051] Since the tangential transmission member 101 is connected to the tangential sealing connection member 102, the steel wire sample fixture 601 on the tangential transmission member 101 is driven to slide tangentially through the piezoelectric actuator via the tangential sealing connection member 102. In the first normal loading unit, the screw force applicator 201 is used to apply a constant normal load through the connected first normal sealing connection member 202202, and the normal force is transmitted through the first normal transmission member 203. The second normal sealing connection member 301 is connected to the tube sample fixture 601 through the second normal transmission member 302, so that the tube sample fixture 601 abuts against the steel wire sample fixture 601. The transmitted normal force makes the steel wire sample fixture 601 and the tube sample fixture 601 touch and bear the normal load, and then the micro-motion wear experimental research under different normal loads is carried out. What is described here is the tangential and normal coupling test. The piezoelectric actuator and the screw force applicator 201 can also be controlled by the driving system to perform tangential and normal experiments respectively.

[0052] See also Figure 5-Figure 7 In this embodiment, the sample fixture 601 and the grinding pair fixture 602 are exemplified as a steel wire sample fixture 601 and a tube sample fixture 601, which can realize the fixation of tube samples and steel wire samples of different lengths and different outer diameters. The tangential loading unit includes a piezoelectric actuator, a tangential transmission member 101, and a tangential sealing connection member 102. The first normal loading unit includes a screw force applicator 201, a first normal sealing connection member 202, and a first normal transmission member 203. The second normal loading unit includes a second normal sealing connection member 301 and a second normal transmission member 302.

[0053] Since the tangential transmission member 101 is connected to the tangential sealing connection member 102, the steel wire sample clamp on the tangential transmission member 101 is driven to slide tangentially through the piezoelectric actuator via the tangential sealing connection member 102. In the first normal loading unit, the screw force applicator 201 is used to apply a constant normal load through the connected first normal sealing connection member 202, and the normal force is transmitted through the first normal transmission member 203. The second normal sealing connection member 301 is connected to the tube sample fixture 601 through the second normal transmission member 302, so that the tube sample fixture 601 abuts against the steel wire sample fixture 601. The transmitted normal force makes the steel wire sample fixture 601 and the tube sample fixture 601 touch and bear the normal load, and then the micro-motion wear experimental research under different normal loads is carried out. What is described here is the tangential and normal coupling test. The piezoelectric actuator and the screw force applicator 201 can also be controlled by the driving system to perform tangential and normal experiments respectively.

[0054] See also Figure 4 In another embodiment, one end of the inner jacket 501 is connected to the transmission member, and the other end thereof is connected to one end of the inner jacket base 502. The inner jacket 501 is sleeved with an inner jacket pressure cap 503 on its circumference, and the inner jacket base 502 is sequentially ringed with a sealing outer sleeve 504, an inner retaining ring 506 and an inner support sleeve 510 on its circumference. One end of the connecting chuck 507 is connected to the sealing outer sleeve 504 through the inner support sleeve 510 and the inner retaining ring 506 in sequence.

[0055] One end of the bellows 508 is connected to the other end of the inner jacket base 502 through a connector 505, and the outer connecting sleeve 509 is sleeved on the circumferential side of the bellows 508. One end of the outer connecting sleeve 509 is connected to the other end of the connecting chuck 507, and the other end of the outer connecting sleeve 509 is sleeved with an outer sleeve nut 511. One end of the connecting rod 512 passes through the outer sleeve nut 511 to connect to the other end of the bellows 508, and the other end of the connecting rod 512 passes through an outer retaining ring 514 and an outer supporting sleeve 515 in turn to connect to the connecting rod end cover 513, and the outer retaining ring 514 and the outer supporting sleeve 515 are sleeved with an outer jacket base 517 on the outside, one end of the outer jacket base 517 is connected to the outer sleeve nut 511, and the other end of the outer jacket base 517 is connected to the outer jacket nut 511, and the outer jacket pressing nut 518 is connected to the outer jacket 516.

[0056] Since one end of the inner jacket 501 is connected to the transmission member, and the other end thereof is connected to one end of the inner jacket base 502, the inner jacket pressing cap 503 can achieve both fixed connection and sealing effect. Secondly, the sealing outer sleeve 504 provided on the periphery of the inner jacket base 502 can also achieve a primary barrier to prevent external gas or impurities from entering, thus forming a primary seal.

[0057] By means of the inner support sleeve 510 and the inner retaining ring 506 arranged around the inner jacket base 502, when the inner retaining ring 506 is abutted between the connecting chuck 507 and the sealing outer sleeve 504, a sealed connection is achieved, and the inner support sleeve 510 is used to fill the gap between the inside of the connecting chuck 507 and the inner jacket base 502, thereby achieving a secondary seal;

[0058] An outer connecting sleeve 509 is sleeved on the circumference of the bellows 508, one end of the outer connecting sleeve 509 is connected to the other end of the connecting chuck 507, and the other end thereof is sleeved with an outer sleeve nut 511. The outer sleeve nut 511 is used to increase the air tightness of the outer connecting sleeve 509 to prevent the internal gas from diffusing outwards, and a three-level seal is formed here;

[0059] The outer jacket pressing nut 518 is located at the end of the end, and the outer jacket 516 is similar to a conical structure with a gap on it. The outer jacket pressing cap is fixed on the outer jacket base 517. The tighter it is screwed, the tighter the cone fit between the outer jacket 516 and the outer jacket pressing cap 518 will be, and the smaller the gap of the outer jacket 516 will be, and the connecting rod end cover 513 will be clamped more tightly, and sealing is achieved by reducing the gap to form a four-level seal.

[0060] In another embodiment, the sample fixture 601 includes a tangential tie rod fixture 603, a sample base 604, and a sample pressing screw 605. The tangential tie rod fixture 603 is fixed to one side of the tangential transmission member 101, and the sample base 604 is detachably connected to the tangential tie rod fixture 603. The test sample is arranged inside the sample base 604 and is fixed by the sample pressing screw 605.

[0061] A secondary sample is arranged inside the grinding pair fixture 602 , and the side of the grinding pair fixture 602 close to the secondary sample abuts against the other side of the sample fixture 601 , and 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 .

[0062] See also Figure 1 , Figure 2 and Fig. 9 In another embodiment, the gas control module includes a sampling and measuring unit, a gas charging unit, a gas exhaust unit and a vacuum unit; the double-layer test chamber 1 is provided with a sampling hole 13, a charging hole 14, a vacuum hole 15 and an exhaust hole 16 which penetrate into the chamber, and the 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 respectively connected to the gas tank, 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 14, and the other end of the main gas pipeline is sequentially provided with the pressure reducing valve, the flow controller, the gas distribution buffer tank, the safety valve and the charging solenoid valve;

[0063] The 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 16, and the other end is connected to the exhaust electric refrigerator. The electric regulating valve is arranged on the exhaust pipe near the exhaust hole 16.

[0064] 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 13, and the other end thereof is connected to the sampling electric refrigerator and the analyzer in sequence, and the analyzer is connected to an external driving system;

[0065] 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 15, and the other end is connected to the vacuum solenoid valve and the vacuum pump in sequence.

[0066] 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;

[0067] 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.

[0068] 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.

[0069] In another embodiment, the present invention also includes a limiting slot unit, including a positioning rod 401, a normal support block 402, a tangential top 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 arranged at the upper end of the normal support block 402 in the slot body 404, the sample fixture 601 and the grinding pair fixture 602 are both embedded in the limiting slot in the middle of the slot body 404, and the slot body 404 is provided with a pair of the tangential top screws 403 on both sides of the sample fixture 601.

[0070] 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, and at the same time, one end of the first normal transmission member 203 and the second normal transmission member 302 are respectively supported by the normal support block 402 in the slot body 404, and at the same time, the sample fixture 601 and the grinding pair fixture 602 are both embedded in the limiting groove in the middle of the slot body 404, realizing the overall limiting, and fixed by a pair of tangential top screws 403 provided on both sides of the slot body 404 corresponding to the sample fixture 601.

[0071] In general, during the experiment, the device first tests to ensure that all system instruments in the external drive system display normal, including temperature, pressure, oxygen concentration, normal force, etc., and then uses a vacuum pump to evacuate the system multiple times to exhaust the air, and then starts the gas filling and exhaust unit to inject the gas required for the experiment. If necessary, vacuum again and repeat the gas injection. By monitoring the oxygen concentration of the gas in the cavity, the gas component content in the experimental cavity can be determined. Start the heating system and heat the double-layer test cavity 1 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 and thermocouple 12, which achieves precise temperature control by controlling the current size. Until the pre-experimental temperature is reached, as the temperature rises, the pressure of the double-layer test cavity 1 increases. When the pressure is too high, the pressure relief valve is started, which can be automatically feedback-regulated by the computer. When the pressure, temperature and atmosphere in the double-layer test chamber 1 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 test working condition parameters, and the micro-motion abrasion test is carried out after adjusting to the preset working condition. 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 experiment.

[0072] 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.

[0073] 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 a high temperature gas environment, characterized in that: include: A double-layer test chamber, which uses an alumina ceramic fiber interlayer and a pressure-bearing boundary metal plate from the inside to the outside, and a movable door that penetrates to the chamber is opened on the front of the double-layer test chamber, and the double-layer test chamber is respectively connected to a gas control module and an external drive system; The double-layer test cavity is provided with a limit 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 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 the tangential sealing connection member and the piezoelectric actuator in sequence, the other side of the tangential transmission member is connected to one end of the first normal transmission member, the other end of the first normal transmission member is connected to the first normal sealing connection member and the 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 the second normal transmission member, the other end of the second normal transmission member is connected to the second normal sealing connection member, and the piezoelectric actuator and the screw force applicator are respectively connected to an external drive system; The heating unit comprises a heating element and a thermocouple. The heating element is arranged on the peripheral sides of the sample fixture and the grinding pair fixture. The thermocouple is arranged close to the heating element and connected to an external driving system.

2. Use the fretting wear test device in a high temperature gas environment as claimed in claim 1, characterized in that: The tangential sealing connector, the first normal sealing connector and the second normal sealing connector all include: Inner jacket, inner jacket base, inner jacket pressure cap, sealing outer sleeve, connector, inner retaining ring, transmission part, connecting chuck, bellows, outer connecting sleeve, inner support sleeve, outer sleeve nut, connecting rod, connecting rod end cover, outer retaining ring, outer support sleeve, outer jacket, outer jacket base and outer jacket pressure nut; One end of the inner jacket is connected to the transmission member, and the other end thereof is connected to one end of the inner jacket base. The inner jacket pressure cap is sleeved on the circumference of the inner jacket, and a sealing outer sleeve, an inner retaining ring and an inner support sleeve are sequentially arranged on the circumference of the inner jacket base. One end of the connecting chuck is connected to the sealing outer sleeve through the inner support sleeve and the inner retaining ring in sequence. One end of the bellows is connected to the other end of the inner jacket base through a connector, the outer connecting sleeve is sleeved on the circumferential side of the bellows, one end of the outer connecting sleeve is connected to the other end of the connecting chuck, and the other end thereof is sleeved with an outer sleeve nut, one end of the connecting rod passes through the outer sleeve nut to connect the other end of the bellows, and the other end thereof passes through an outer retaining ring and an outer supporting sleeve in sequence to connect to the connecting rod end cover, and the outer retaining ring and the outer supporting sleeve are sleeved with an outer jacket base on the outside, one end of the outer jacket base is connected to the outer jacket nut, and the other end thereof is connected to the outer jacket pressing nut through the outer jacket.

3. The fretting wear test device in a high temperature gas environment according to 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 a high temperature gas environment according to 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 a high temperature gas environment as claimed in claim 1, characterized in that: The gas control module comprises: Sampling and measuring unit, gas filling unit, gas exhaust unit and vacuum unit; the double-layer test chamber is provided with sampling holes, filling holes, vacuum holes and exhaust holes that penetrate into the chamber, the 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 bus is respectively connected to the gas tank, 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; The 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 an external driving system; 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.

6. The fretting wear test device in a high temperature gas environment as claimed in claim 1, characterized in that: Also includes: The limiting slot unit comprises a positioning rod, a normal support block, a tangential top screw 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 arranged 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. The slot body is provided with a pair of tangential top screws on both sides corresponding to the sample fixture.

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