Device for testing impact fretting wear in high-temperature and high-pressure water and use method of device

Abstract

The invention relates to the field of fretting wear testing, in particular to a high-temperature and high-pressure water impact fretting wear testing device and a using method thereof. The high-pressure kettle adopts a vertical structure that a lower base, a middle kettle body and an upper kettle cover are sequentially connected from bottom to top, the high-pressure kettle is fixed on a rack through the lower base, and a normal impact shaft connected with a driving mechanism extends into an inner cavity of the high-pressure kettle from the base and corresponds to the lower side of an impact material B in the inner cavity of the high-pressure kettle; the impacted material A and the impact material B correspond to each other up and down, the fixed base of the impact material B clamp is fixed at the top end of the normal impact shaft, the impact material B is driven to move up and down through the movement of the normal impact shaft, normal impact is performed on the impacted material A, and the impact fretting wear test is realized. The problems that in-situ impact fretting wear testing is difficult to complete in a high-temperature and high-pressure water environment, impact amplitude and frequency are difficult to accurately control, and plate-pipe or pipe-grillwork contact fretting wear testing is difficult to achieve are solved.

Description

Technical Field

[0001] The present invention relates to the field of fretting wear testing, and specifically to an impact fretting wear testing device in high-temperature and high-pressure water and its use method. Background Art

[0002] Nuclear energy has the characteristics of being clean, efficient, economical, and safe. The primary loop water of a pressurized water reactor enters the reactor core, absorbs heat from the reactor core, and then transfers the heat to the secondary loop water through the heat transfer tubes in the steam generator. The secondary loop water is converted into steam, which drives the steam turbine generator to generate electricity. After releasing heat, the primary loop water and the secondary loop water will be condensed and recycled. Thus, it can be seen that the zirconium alloy cladding tube in the fuel assembly is the first safety barrier to prevent nuclear leakage, and the heat transfer tube in the steam generator is the second safety barrier to prevent nuclear leakage. However, during the operation of a pressurized water reactor, due to the effect of fluid-induced vibration, the cladding tube and the heat transfer tube will inevitably undergo fretting wear, resulting in a reduction in wall thickness or even perforation, thereby causing the leakage of radioactive substances and seriously affecting the safe and efficient operation of nuclear power plants. According to statistics, at present, fretting wear is the most main failure form of the cladding tube and the heat transfer tube. Therefore, it is urgent to carry out research on the fretting wear behavior of the cladding tube and the heat transfer tube in high-temperature and high-pressure water (200 - 360 °C, 4 - 20 MPa). On the premise of precisely controlling various mechanical parameters, realizing the fretting wear behavior research of the cladding tube and the heat transfer tube under the simulated actual service environment has become the current research trend and direction of effort.

[0003] Since it is difficult for various sensors to be directly used in the environment of high-temperature and high-pressure water and the sealing of various autoclave penetrations is relatively difficult, it is difficult to realize in-situ impact fretting wear testing in high-temperature and high-pressure water. At present, the fretting wear testing of the cladding tube and the heat transfer tube is mainly carried out in room-temperature air or room-temperature water. However, the material properties, corrosion resistance, and the properties of water of the cladding tube and the heat transfer tube in high-temperature and high-pressure water are different from those in the room-temperature environment, which will affect the contact form and stress distribution at the impact interface. Thus, it is obviously unreasonable to evaluate the wear behavior in high-temperature and high-pressure water based on the impact fretting wear behavior in the room-temperature environment. Summary of the Invention

[0004] The purpose of the present invention is to provide an impact fretting wear testing device in high-temperature and high-pressure water and its use method, which can carry out in-situ impact fretting wear testing in the simulated high-temperature and high-pressure water environment of a pressurized water reactor, and solve the problems that it is difficult to complete in-situ fretting wear testing under high-temperature and high-pressure water conditions, it is difficult to precisely control the impact amplitude and impact frequency, and it is difficult to realize the fretting wear testing of the plate-tube or tube-grid contact form.

[0005] The technical solution of the present invention is as follows:

[0006] An impact fretting wear testing device in high-temperature and high-pressure water, the structure of the device is as follows:

[0007] The autoclave adopts a vertical structure with a lower base, a middle body and an upper cover, which are connected in sequence from bottom to top. The autoclave is fixed on the bench through the lower base. The horizontal bench is supported by four bench columns. A driving mechanism is arranged below the base. The middle body of the autoclave is installed on the lower base. A horizontal positioning plate is arranged above the cover. The top of the cover is connected to the middle of the positioning plate through four autoclave lifting bolts. The upper cover is connected to two columns on the bench through the positioning plate, and the positioning plate is connected to the hydraulic pump; A metal sealing ring is used to seal between the cover and the body and is fastened with bolts; A metal sealing ring is used to seal between the body and the base and is fastened with bolts;

[0008] Inside the autoclave cavity, there are impact material A, fixture for impact material A, impact material B, fixture for impact material B. The normal impact shaft connected to the driving mechanism extends from the base to the autoclave cavity and corresponds to the lower side of impact material B in the autoclave cavity. Impact material A is installed on the fixture for impact material A, and impact material B is installed on the fixture for impact material B. Impact material A and impact material B are vertically corresponding. The fixture for impact material B is fixed to the top of the normal impact shaft through a fixed base. The movement of the normal impact shaft drives impact material B to move up and down to perform normal impact on impact material A, realizing the impact fretting wear test.

[0009] For the high-temperature and high-pressure water impact fretting wear test device described above, the positioning plate is sleeved on two columns on the bench through two inner holes respectively. An upper limit retaining sleeve and a lower limit retaining sleeve are arranged on each column. The two upper limit retaining sleeves and the two lower limit retaining sleeves are aligned horizontally. The bottom of the two inner holes of the positioning plate is nested with positioning plate sliders. The positioning plate is in sliding fit with the column through the positioning plate sliders. The positioning plate and the positioning plate sliders are located between the upper limit retaining sleeve and the lower limit retaining sleeve; Both sides of the positioning plate are connected to the hydraulic pump through hydraulic devices. The hydraulic devices connected to the hydraulic pump are located on both sides of the column. A hand crank and a bleed valve are arranged on the hydraulic pump. The hydraulic pump provides hydraulic power for driving the sliding of the positioning plate.

[0010] The high-temperature and high-pressure water impact micro-motion wear testing device has a driving mechanism arranged below the base, including an upper support plate, a support column, a lower support plate, an upper baffle, a transmission pillar, a lower baffle, a normal impact shaft, a transmission shaft, a fatigue testing machine, an acoustic wave detection displacement sensor, and a reflection baffle. The upper support plate and the lower support plate are arranged relatively parallel to each other in the upper and lower directions. The lower support plate is connected to the upper support plate through four support columns. A pressure balance system is arranged between the top of the upper support plate and the bottom of the base. A cooling water jacket is arranged on the outside of the pressure balance system. A fatigue testing machine is arranged at the bottom of the lower support plate. A transmission bracket is arranged between the upper support plate and the lower support plate. The transmission bracket is an upper baffle and a lower baffle arranged relatively parallel to each other in the upper and lower directions. The square baffles are connected by four transmission pillars; the vertical normal impact shaft is sequentially arranged through the upper baffle, upper support plate, pressure balance system, cooling water jacket and base of the transmission pillar, the upper end of the normal impact shaft extends into the autoclave, and the normal impact shaft and the base are sealed by a sealing ring; the normal impact shaft passes through the center hole of the upper baffle and is connected and fixed to the upper baffle by a nut; the transmission shaft of the fatigue testing machine passes through the center hole of the lower support plate and is connected to the lower baffle, so that the lower baffle is fixed on the transmission shaft; the acoustic wave detection type displacement sensor is arranged on the lower support plate, and the reflection baffle corresponding to the acoustic wave detection type displacement sensor is installed on the lower baffle to measure and control the impact amplitude in real time.

[0011] The high-temperature and high-pressure water impact fretting wear testing device has a normal impact shaft with a built-in pressure sensor, which is located in the cooling water jacket area, collects the normal force during the impact fretting wear process, and is connected to the normal force regulator and display of the control system; a pressure balance system is provided between the normal impact shaft and the autoclave, and the normal impact shaft and the pressure balance system are sealed by a sealing ring to offset the force generated by the high pressure, thereby realizing accurate measurement and control of the normal force.

[0012] The impact micro-motion wear testing device in high temperature and high pressure water has a normal impact shaft extending into the autoclave body and corresponding to the impact material B; the fixed base of the impact material B fixture is fixed to the upper end of the normal impact shaft by four bolts, the impact material B fixture is fixed to the top of the fixed base by four screws, and the impact material B is fixed to the impact material B fixture by bolts, so that the impact material B is tightly connected to the normal impact shaft; the impacted material A fixture is fixed to the inner cavity of the autoclave by four fixed pillars and nuts, the impacted material A is fixed to the impacted material A fixture by nuts, and the upper side of the impact material B corresponds to the lower side of the impacted material A.

[0013] The described impact fretting wear test device in high-temperature and high-pressure water. The fixture for impact material B is designed according to the dimensions of the cladding tube and the heat transfer tube. Impact material B is tubular, and its bottom should be arc-shaped and adapted to the fixture for impact material B, fitting tightly. At the same time, the impacted material A is designed as a sheet, plate, spring or rigid convex body. The fixture for impacted material A is designed according to the dimensions of the sheet, plate, spring or rigid convex body to achieve the contact form of tube-plate or tube-grid contact. The impacted material A and the impact material B are in linear contact, forming a friction pair. The fixture for impact material B and the fixed base, and the fixture for impacted material A and the fixed support are made of stainless steel, nickel-based alloy or zirconium alloy.

[0014] The described impact fretting wear test device in high-temperature and high-pressure water. A bottom ceramic heating sleeve is arranged on the outside of the base, a middle ceramic heating sleeve is arranged on the outside of the autoclave body, and a top ceramic heating sleeve is arranged on the outside of the autoclave cover. The top ceramic heating sleeve, the middle ceramic heating sleeve and the lower ceramic heating sleeve form a three-layer annular heating device from top to bottom to achieve uniform temperature in the inner cavity of the autoclave. At the same time, the thermocouple is inserted into the inner cavity of the autoclave through the thermocouple mounting seat at the bottom of the base. The thermocouple mounting seat is fixedly connected to the base through the thermocouple fixing bolt to monitor and control the temperature in the autoclave in real time.

[0015] The described impact fretting wear test device in high-temperature and high-pressure water. The inner cavity of the autoclave is connected to the water chemical circuit. The structure of the water chemical circuit is as follows: An inlet pipe and an exhaust pipe communicating with the inner cavity of the autoclave are penetrated through the side of the base. One end of the inlet pipe is connected to the water chemical environment, and the other end of the inlet pipe is located at the bottom of the inner cavity of the autoclave. One end of the exhaust pipe is located in the upper part of the inner cavity of the autoclave. An inlet valve, a pressure sensor, a pressure gauge and a safety valve are installed on the inlet pipe, and an exhaust valve is installed on the exhaust pipe.

[0016] The described impact fretting wear test device in high-temperature and high-pressure water. The device is equipped with a control system and a data monitoring and acquisition system, mainly including displays, controllers and regulators for temperature, pressure, amplitude, frequency and normal force. The temperature controller is connected to the temperature display and the over-temperature or low-temperature alarm device. The pressure controller is connected to the pressure display and the over-pressure or low-pressure alarm device. The impact amplitude regulator is connected to the impact amplitude display. The frequency regulator is connected to the frequency display. The normal load regulator is connected to the normal load display. Each controller and regulator are respectively connected to the relay in the control system. The relay is connected to the electric furnace wires in the top ceramic heating sleeve, the middle ceramic heating sleeve and the bottom ceramic heating sleeve through wires. A heating power switch and a heating indicator light are arranged on the wires to form a power-off protection structure for over-temperature, low-temperature, over-pressure and low-pressure.

[0017] The usage method of the impact fretting wear test device in high-temperature and high-pressure water is as follows:

[0018] (1) Drive a hydraulic pump through a hand crank to provide hydraulic power and drive the positioning plate to rise to open the autoclave lid.

[0019] (2) Fix the impact material B on the impact material B fixture, and install it on the fixed base. Install the fixed base of the impact material B fixture on the normal impact shaft and tighten it with bolts.

[0020] (3) Install the material A to be impacted on the material A to be impacted fixture, and install the material A to be impacted fixture at a fixed position in the inner cavity of the autoclave through nuts and fixed struts, and tighten all fastening structures.

[0021] (4) Adjust the position of the material A to be impacted fixture so that the impact material B and the material A to be impacted are relatively horizontal and there is a gap; turn on the cooling water switch to fill the cooling water jacket with cooling water.

[0022] (5) Place a metal sealing ring at the groove at the upper end of the autoclave body; open the air release valve of the hydraulic pump, lower the autoclave lid until its lower groove is tightly combined with the metal sealing ring, and tighten the autoclave lid fastening bolts to make the two combined into a tightly closed autoclave.

[0023] (6) Open the high-temperature and high-pressure water circulation loop to fill the autoclave with solution, and at the same time, through the back pressure valve of the water circulation loop, adjust the pressure in the autoclave to the required test value.

[0024] (7) According to the test requirements, set the dissolved hydrogen and dissolved oxygen concentrations through the dissolved hydrogen control interface and the dissolved oxygen control interface, open the nitrogen, air, and hydrogen valves of the water chemistry loop, and automatically adjust the dissolved hydrogen and dissolved oxygen concentrations.

[0025] (8) According to the test requirements, set the target temperature and the corresponding over-temperature or low-temperature alarm limit temperature through the preheater control interface and the autoclave heating control interface, and start; set the corresponding over-pressure or low-pressure alarm limit pressure through the pressure control interface, and start; after heating for a period of time, the temperature reaches the set value and is kept warm.

[0026] (9) According to the mechanical parameter requirements of the test, set the target amplitude on the impact amplitude control interface; set the target frequency through the impact frequency control interface; set the target normal force on the normal force control interface, and set the alarm emergency stop parameters; turn on the switch of the fatigue testing machine to carry out the impact fretting wear test in high-temperature and high-pressure water, and collect and feedback-adjust the measured information in real time.

[0027] (10) After reaching the target impact time, turn off the switch of the fatigue testing machine, and cool down the temperature through the programs of the preheater control interface and the autoclave heating control interface.

[0028] The design concept of the present invention is:

[0029] 1. The integrated control of three modules, namely impact amplitude, impact normal force, and impact frequency, is one of the design concepts of the present invention. During the impact fretting process, the impact amplitude, impact normal force, and impact frequency change constantly. However, when studying impact fretting wear, constant or alternating mechanical parameters are generally adopted. The present invention integrates three modules of impact amplitude, impact normal force, and impact frequency, and can control the three mechanical parameters in a constant or alternating manner to achieve versatility.

[0030] 2. The high stiffness of the normal impact shaft is the second design concept of the present invention. During the impact fretting process, due to the elastic deformation of the material, there are differences between the applied impact amplitude and impact normal force and the values actually applied between the samples. In the device of the present invention, high-strength steel with high temperature resistance is selected for the materials of the normal impact shaft and the specimen fixture. At the same time, the diameter of the normal impact shaft is increased, and four transmission struts and various bolts are used for connection to increase the stiffness of the normal impact shaft and reduce the influence of elastic deformation. In addition, due to the increase in the diameter of the normal impact shaft, the normal impact shaft of the present invention is placed below the autoclave body, which can greatly reduce the influence of its own gravity.

[0031] 3. Precise control of the initial zero point is the third design concept of the present invention. During the impact fretting process, the stability of the initial zero point is the prerequisite for accurately applying the impact amplitude, impact normal force, and impact frequency. In the device of the present invention, an acoustic wave detection type displacement sensor is adopted, and its reflection baffle is connected to the normal impact shaft and moves with the normal impact. While real-time collecting and accurately controlling the impact amplitude, the initial zero point can be real-time collected and fed back to the control system. Through the calculation program of the control system, compensation and zero clearing are carried out to keep the position of the initial zero point unchanged.

[0032] The advantages and beneficial effects of the present invention are as follows:

[0033] 1. The device of the present invention can realize in-situ impact fretting wear testing of tube-plate or tube-grid contact specimens in high-temperature and high-pressure water, can simulate the water chemistry environment of the primary and secondary loops of a pressurized water reactor, and realize impact fretting wear testing under real contact forms.

[0034] 2. The present invention uses an electromagnetic high-frequency fatigue testing machine as the driving mechanism, accurately measures the displacement through an acoustic wave detection type displacement sensor and a displacement measurement system, and conducts real-time feedback adjustment through a signal acquisition, processing, and control system.

[0035] 3. The present invention sets the impact shaft at the bottom of the autoclave. Compared with setting the impact shaft on the side of the autoclave, it can eliminate the bending caused by the self-gravity of the impact shaft.

[0036] 4. The impact material B fixture and its fixed base of the present invention are fixed by bolts. The impacted material A and its fixture are installed on the upper side of the impact material B. The fixture installation is simple, convenient, and has a good fastening effect.

[0037] 5. The present invention uses a data acquisition system to collect, process, and control the impact frequency, amplitude, and normal force in real time, featuring simple control and high control accuracy.

[0038] 6. The present invention uses a three-layer ceramic heating sleeve annular device to ensure precise temperature control inside the autoclave.

[0039] 7. The present invention solves the sealing and pressure balance problems of the impact transmission device through a sealing ring and a pressure balance system, and protects the sealing ring and the pressure balance system through a cooling water jacket. Brief Description of the Drawings

[0040] Figure 1 It is a schematic structural diagram of an impact fretting wear test device in high-temperature and high-pressure water. In the figure, 1 is the base; 2 is the autoclave body; 3 is the autoclave cover; 4 is the column; 5 is the upper limit retaining sleeve; 6 is the positioning plate; 7 is the positioning plate slider; 8 is the lower limit retaining sleeve; 9 is the safety valve; 10 is the pressure gauge; 11 is the pressure sensor; 12 is the autoclave lifting bolt; 13 is the autoclave cover fastening bolt; 14 is the top ceramic heating sleeve; 15 is the middle ceramic heating sleeve; 16 is the lower ceramic heating sleeve; 17 is the liquid inlet valve; 18 is the exhaust valve; 19 is the bench; 20 is the bench support; 21 is the thermocouple mounting seat; 22 is the cooling water jacket; 23 is the pressure balance system; 24 is the upper support plate; 25 is the upper baffle; 26 is the normal impact shaft; 27 is the lower baffle; 28 is the transmission shaft; 29 is the lower support plate; 30 is the fatigue testing machine; 31 is the acoustic wave detection type displacement sensor; 32 is the reflection baffle; 33 is the transmission support; 34 is the support column; 35 is the hydraulic pump.

[0041] Figure 2 It is a schematic structural diagram of the inner cavity of the autoclave and the friction pair. In the figure, 1 is the base; 2 is the autoclave body; 3 is the autoclave cover; 12 is the autoclave lifting bolt; 13 is the autoclave cover fastening bolt; 14 is the top ceramic heating sleeve; 15 is the middle ceramic heating sleeve; 16 is the lower ceramic heating sleeve; 17 is the liquid inlet valve; 18 is the exhaust valve; 19 is the bench; 21 is the thermocouple mounting seat; 22 is the cooling water jacket; 26 is the normal impact shaft; 36 is the thermocouple fixing bolt; 37 is the thermocouple; 38 is the fixture for the impacted material A; 39 is the fixing support; 40 is the impacted material A; 41 is the impact material B; 42 is the fixture for the impact material B; 43 is the fixed base; 44 is the metal sealing ring; 75 is the liquid inlet pipe; 76 is the exhaust pipe.

[0042] Figure 3It is a schematic diagram of the control cabinet structure, which includes a control system and a data monitoring and acquisition system. In the figure, the control system includes: 45 temperature, pressure, dissolved hydrogen, and dissolved oxygen control systems; 46 main interface; 47 dissolved hydrogen control interface; 48 dissolved oxygen control interface; 49 pressure control interface; 50 preheater control interface; 51 autoclave heating control interface; 52 abnormal alarm interface; 53 emergency stop button; 54 mechanical parameter control system; 55 main interface; 56 impact amplitude control interface; 57 impact frequency control interface; 58 impact normal force control interface; 59 abnormal alarm interface. 60 control cabinet heat dissipation device; 61 computer connection port. The data monitoring and acquisition system includes: 62 water chemistry loop monitoring and acquisition system; 63 temperature monitoring and acquisition interface; 64 pressure monitoring and acquisition interface; 65 dissolved hydrogen monitoring and acquisition interface; 66 dissolved oxygen monitoring and acquisition interface; 67 pH monitoring and acquisition interface. 68 control cabinet door handle; 69 dissolved hydrogen probe display; 70 dissolved oxygen probe display; 71 conductivity probe display; 72 pH probe display; 73 radiator switch; 74 control cabinet switch. Detailed implementation mode

[0043] In the specific implementation process, the present invention proposes a high-temperature and high-pressure water impact fretting wear test device and its use method, which is composed of an autoclave, a driving mechanism, a normal impact transmission device, a displacement sensor, a heating jacket, a control system, a data monitoring and acquisition system, a fixed support, a hydraulic pump, a water chemistry loop, etc., and can realize the impact fretting wear test of tube-plate or tube-grid contact friction pairs in high-temperature and high-pressure water. During the impact fretting wear process, the data monitoring and acquisition system can monitor and collect data such as impact amplitude, frequency, and normal force in real time, and feedback them to the control system to achieve precise control of mechanical parameters. At the same time, the water chemistry loop can simulate the water chemistry environment of the primary and secondary loops of a pressurized water reactor, automatically adjust the dissolved hydrogen concentration and dissolved oxygen concentration, and monitor the pH and conductivity of the solution in real time.

[0044] As Figure 1 - Figure 2As shown in the figure, the high-temperature and high-pressure water impact fretting wear test device of the present invention mainly includes: base 1, autoclave body 2, autoclave cover 3, column 4, upper limit retaining sleeve 5, positioning plate 6, positioning plate slider 7, lower limit retaining sleeve 8, safety valve 9, pressure gauge 10, pressure sensor 11, high-pressure autoclave lifting bolt 12, autoclave cover fastening bolt 13, top ceramic heating sleeve 14, middle ceramic heating sleeve 15, lower ceramic heating sleeve 16, liquid inlet valve 17, exhaust valve 18, bench 19, bench support column 20, thermocouple mounting seat 21, cooling water jacket 22, pressure balance system 23, upper support plate 24, upper baffle 25, normal impact shaft 26, lower baffle 27, transmission shaft 28, lower support plate 29, fatigue testing machine 30, acoustic wave detection type displacement sensor 31, reflection baffle 32, transmission support column 33, support column 34, hydraulic pump 35, thermocouple fixing bolt 36, thermocouple 37, etc. The specific structure is as follows:

[0045] The high-pressure autoclave adopts a vertical structure with a lower base 1, a middle autoclave body 2 and an upper autoclave cover 3 connected in sequence from bottom to top. The high-pressure autoclave is fixed on the bench 19 through the lower base 1. The horizontal bench 19 is supported by four bench support columns 20. A driving mechanism is arranged below the base 1. The middle autoclave body 2 is installed on the lower base 1. A horizontal positioning plate 6 is arranged above the autoclave cover 3. The top of the autoclave cover 3 is connected to the middle part of the positioning plate 6 through four high-pressure autoclave lifting bolts 12. The upper autoclave cover 3 is connected to two columns 4 on the bench 19 through the positioning plate 6, and the positioning plate 6 is connected to the hydraulic pump 35; A metal sealing ring 44 is used for sealing between the autoclave cover 3 and the autoclave body 2, and it is fastened with bolts 13; A metal sealing ring is used for sealing between the autoclave body 2 and the base 1, and it is fastened with bolts.

[0046] Inside the high-pressure autoclave cavity, there are impact material A 40, impact material A fixture 38, impact material B 41, impact material B fixture 42. The normal impact shaft 26 connected to the driving mechanism extends from the base 1 into the high-pressure autoclave cavity and corresponds to the lower side of the impact material B 41 in the high-pressure autoclave cavity. The impact material A 40 is installed on the impact material A fixture 38, and the impact material B 41 is installed on the impact material B fixture 42. The impact material A 40 and the impact material B 41 are vertically corresponding. The impact material B fixture 42 is fixed to the top end of the normal impact shaft 26 through the fixed base 43. By the movement of the normal impact shaft 26, the impact material B 41 moves up and down to perform normal impact on the impact material A 40, realizing the impact fretting wear test.

[0047] The positioning plate 6 is sleeved on two columns 4 on the bench 19 through two inner holes respectively. An upper limit retaining sleeve 5 and a lower limit retaining sleeve 8 are provided on each column 4. The two upper limit retaining sleeves 5 and the two lower limit retaining sleeves 8 are aligned horizontally respectively. The bottom of the two inner holes of the positioning plate 6 is nested with positioning plate sliders 7. The positioning plate 6 is slidably matched with the column 4 through the positioning plate sliders 7. The positioning plate 6 and the positioning plate sliders 7 are located between the upper limit retaining sleeve 5 and the lower limit retaining sleeve 8. When the upper limit retaining sleeve 5 and the lower limit retaining sleeve 8 are tightened, the positioning plate 6 can be fixed at the required position. Both sides of the positioning plate 6 are connected to the hydraulic pump 35 through hydraulic devices. The hydraulic devices connected to the hydraulic pump 35 are located on both sides of the column 4. The hydraulic pump 35 is provided with a hand rocker and a bleed valve. The hydraulic pump 35 can provide hydraulic power to drive the sliding of the positioning plate 6. During use, the hydraulic pump 35 is driven by the hand rocker, so as to drive the kettle cover 3 connected to the positioning plate 6 to move up and down.

[0048] The driving mechanism is arranged below the base 1 and includes a cooling water jacket 22, a pressure balance system 23, an upper support plate 24, support columns 34, a lower support plate 29, an upper baffle 25, a transmission support column 33, a lower baffle 27, a normal impact shaft 26, a transmission shaft 28, a fatigue testing machine 30, a sonic wave detection type displacement sensor 31, and a reflection baffle 32. The upper support plate 24 and the lower support plate 29 are arranged parallel to each other up and down. The lower support plate 29 is connected to the upper support plate 24 by four support columns 34. A pressure balance system 23 is arranged between the top of the upper support plate 24 and the bottom of the base 1. A cooling water jacket 22 is arranged outside the pressure balance system 23. A fatigue testing machine 30 is arranged at the bottom of the lower support plate 29. A transmission bracket is arranged between the upper support plate 24 and the lower support plate 29. The transmission bracket is composed of an upper baffle 25 and a lower baffle 27 which are arranged parallel to each other up and down and are connected by four transmission support columns 33. The vertical normal impact shaft 26 sequentially passes through the upper baffle 25 of the transmission support column 33, the upper support plate 24, the pressure balance system 23, the cooling water jacket 22, and the base 1. The upper end of the normal impact shaft 26 extends into the autoclave. A sealing ring is used for sealing between the normal impact shaft 26 and the base 1. The normal impact shaft 26 should preferably be selected with a large diameter to reduce the influence of material deformation during the impact fretting wear process. The normal impact shaft 26 passes through the central hole of the upper baffle 25 and is connected and fixed to the upper baffle 25 by a nut. The transmission shaft 28 of the fatigue testing machine 30 passes through the central hole of the lower support plate 29 and is connected to the lower baffle 27, so that the lower baffle 27 is fixed on the transmission shaft 28. The cooling water jacket 22 circulates cooling water to effectively prevent the rubber sealing ring, the shaft sleeve, and the temperature of the pressure balance system 23 from being too high. A pressure sensor is arranged inside the normal impact shaft 26, and the pressure sensor is located in the area of the cooling water jacket 22 to collect the normal force during the impact fretting wear process and is connected to the normal force regulator and the display of the control system, and can monitor and control the normal force in real time. The change range of the controllable normal force is 5N to 500N. A pressure balance system 23 is arranged between the normal impact shaft 26 and the autoclave. A sealing ring is used for sealing between the normal impact shaft 26 and the pressure balance system 23 to offset the acting force generated by the high pressure, so as to realize the accurate measurement and control of the normal force. The sonic wave detection type displacement sensor 31 is arranged on the lower support plate 29, and the reflection baffle 32 corresponding to the sonic wave detection type displacement sensor 31 is installed on the lower baffle 27 to measure and control the impact amplitude in real time.

[0049] The normal impact shaft 26 extends into the autoclave body 2 and corresponds to the impact material B41. The fixed base 43 of the impact material B fixture 42 is fixed to the upper end of the normal impact shaft 26 by four bolts. The impact material B fixture 42 is fixed to the top of the fixed base 43 by four screws. The impact material B41 is fixed to the impact material B fixture 42 by bolts to achieve a tight connection between the impact material B41 and the normal impact shaft 26. The fixture of the material A to be impacted 38 is fixed to the inner cavity of the autoclave by four fixed struts 39 and nuts. The material A to be impacted 40 is fixed to the fixture of the material A to be impacted 38 by nuts. The upper side of the impact material B41 corresponds to the lower side of the material A to be impacted 40.

[0050] The fixtures of the impact material B41 and the material A to be impacted 40 can be designed according to the test requirements and shape characteristics: The impact material B fixture 42 should be designed according to the dimensions of the cladding tube and the heat transfer tube. The impact material B41 is tubular, and its bottom should be arc-shaped and adapted to the impact material B fixture 42 for a tight fit. At the same time, the material A to be impacted 40 is designed as a sheet, plate, spring or rigid convex body. Multiple fixtures of the material A to be impacted 38 need to be designed according to the dimensions of the sheet, plate, spring or rigid convex body to achieve the contact form of tube-plate or tube-grid contact. The impact material B41 and the material A to be impacted 40 are in linear contact, forming a friction pair. The impact material B fixture 42, the fixed base 43, the fixture of the material A to be impacted 38 and the fixed strut 39 can all be processed from stainless steel, nickel-based alloy or zirconium alloy, etc.

[0051] A bottom ceramic heating sleeve 16 is arranged on the outer side of the base 1, a middle ceramic heating sleeve 15 is arranged on the outer side of the autoclave body 2, and a top ceramic heating sleeve 14 is arranged on the outer side of the autoclave lid 3. The top ceramic heating sleeve 14, the middle ceramic heating sleeve 15 and the lower ceramic heating sleeve 16 form a three-layer annular heating device from top to bottom to achieve uniform temperature in the inner cavity of the autoclave. At the same time, the thermocouple 37 is inserted into the inner cavity of the autoclave through the thermocouple mounting seat 21 at the bottom of the base 1. The thermocouple mounting seat 21 is fixedly connected to the base 1 by a thermocouple fixing bolt 36 to monitor and control the temperature in the autoclave in real time.

[0052] The inner cavity of the autoclave is connected to the water chemical circuit. The structure of the water chemical circuit is as follows: The side of the base 1 is penetrated with a liquid inlet pipe 75 and an exhaust pipe 76 that communicate with the inner cavity of the autoclave. One end of the liquid inlet pipe 75 is connected to the water chemical environment, and the other end of the liquid inlet pipe 75 is located at the bottom of the inner cavity of the autoclave. One end of the exhaust pipe 76 is located in the upper part of the inner cavity of the autoclave. An inlet valve 17, a pressure sensor 11, a pressure gauge 10 and a safety valve 9 are installed on the liquid inlet pipe 75. An exhaust valve 18 is installed on the exhaust pipe 76.

[0053] The drive mechanism of the present invention uses an electromagnetic high-frequency fatigue testing machine. Alternatively, a suitable fatigue testing machine can be selected according to actual conditions. The impact material B41 and the impact material B fixture 42 are connected to the fatigue testing machine 30 through the normal impact shaft 26. The electromagnetic high-frequency fatigue testing machine has two modes: impact amplitude control and normal force control. The fatigue testing machine 30 drives the movement of the transmission bracket and the normal impact shaft 26 to achieve the normal impact movement between the impact material B41 and the impacted material A40. The acoustic wave detection type displacement sensor 31 is fixed on the lower support plate 29, and the reflection baffle 32 is installed on the lower baffle 27. The acoustic wave detection type displacement sensor 31 is connected to the amplitude regulator and the display of the control system to measure and collect the change in displacement during the impact fretting wear process in real time. The controllable impact amplitude change range is ±5μm to ±200μm. Furthermore, the impact amplitude during the impact fretting wear process is precisely controlled through the signal acquisition and processing control system. The fatigue testing machine 30 drives the normal impact shaft 26 to move through the transmission shaft 28 to achieve the normal impact movement between the impact material B41 and the impacted material A40. Its impact frequency is 1 to 300Hz, and the impact frequency is precisely controlled by the signal acquisition and processing control system. At the same time, the fatigue testing machine 30 can stably apply a normal load of 5N to 500N and perform real-time measurement and control through the signal acquisition and processing control system.

[0054] The present invention is provided with a standard interface outside the autoclave, which can be connected to an external high-temperature and high-pressure water circulation corrosion experiment system with an automatic control function through a ferrule (see Chinese invention patent, publication number: CN102401780A, application date: September 8, 2010; Chinese utility model patent, publication number: CN201852774U, application date: September 8, 2010, authorization date: June 1, 2011), so as to precisely control the water chemical environment inside the autoclave.

[0055] As Figure 3 shown, the control cabinet of the present invention is provided with a control system and a data monitoring and acquisition system, mainly including displays, controllers, and regulators for temperature, pressure, mechanical parameters (such as amplitude, frequency, normal force), and the water chemical circuit, as well as a temperature and pressure protection system. The temperature controller is connected to the temperature display and the over-temperature (low-temperature) alarm device, the pressure controller is connected to the pressure display and the over-pressure (low-pressure) alarm device, the impact amplitude regulator is connected to the impact amplitude display, the frequency regulator is connected to the frequency display, and the normal load regulator is connected to the normal load display.

[0056] The temperature, pressure, dissolved hydrogen, and dissolved oxygen control systems 45, main interface 46, dissolved hydrogen control interface 47, dissolved oxygen control interface 48, pressure control interface 49, preheater control interface 50, autoclave heating control interface 51, and abnormal alarm interface 52 of the control system are located in the upper left part of the control cabinet. The mechanical parameter control system 54, main interface 55, impact amplitude control interface 56, impact frequency control interface 57, impact normal force control interface 58, and abnormal alarm interface 59 of the control system are located in the middle left part of the control cabinet. The water chemistry loop monitoring and acquisition system 62, temperature monitoring and acquisition interface 63, pressure monitoring and acquisition interface 64, dissolved hydrogen monitoring and acquisition interface 65, dissolved oxygen monitoring and acquisition interface 66, and pH monitoring and acquisition interface 67 of the data monitoring and acquisition system are located in the upper right part of the control cabinet. The dissolved hydrogen probe display 69, dissolved oxygen probe display 70, conductivity probe display 71, and pH probe display 72 are located in the middle right part of the control cabinet.

[0057] The main interface 46, dissolved hydrogen control interface 47, dissolved oxygen control interface 48, pressure control interface 49, preheater control interface 50, autoclave heating control interface 51, and abnormal alarm interface 52 are provided in the temperature, pressure, dissolved hydrogen, and dissolved oxygen control system 45. The main interface 46 can monitor the changes in temperature, pressure, dissolved hydrogen, and dissolved oxygen in real time. The dissolved hydrogen control interface 47 can set and control the dissolved hydrogen concentration. The dissolved oxygen control interface 48 can set and control the dissolved oxygen concentration. The pressure control interface 49 can set and control the pressure inside the autoclave. The preheater control interface 50 can set and control the circulating water temperature inside the preheater. The autoclave heating control interface 51 can set and control the temperature inside the autoclave. The abnormal alarm interface 52 can set the maximum temperature (pressure) and minimum temperature (pressure), and is connected to the temperature (pressure) controller and temperature (pressure) display, and can alarm when the temperature and pressure exceed or are lower than the set value.

[0058] The main interface 55, impact amplitude control interface 56, impact frequency control interface 57, impact normal force control interface 58, and abnormal alarm interface 59 are provided in the mechanical parameter control system 54. The main interface 55 can control and feedback the impact amplitude, impact frequency, and normal force in real time. The impact amplitude control interface 56 can set and control the impact amplitude. The impact frequency control interface 57 can set and control the impact frequency. The normal force control interface 58 can set and control the normal force. The abnormal alarm interface 59 can alarm when the impact amplitude, impact frequency, and normal force exceed the set value, and also alarm when the current or voltage is overloaded.

[0059] Each controller and regulator are respectively connected to the relay within the control system. The relay is respectively connected to the heating wires in the top ceramic heating sleeve 14, the middle ceramic heating sleeve 15 and the bottom ceramic heating sleeve 16 through wires. A heating power switch and a heating indicator light are arranged on the wires, forming a power-off protection structure for over-temperature, low-temperature, over-pressure and low-pressure. In addition, the control cabinet is provided with an emergency stop button 53 to meet the requirement of simultaneously shutting down all settings in special situations. By setting an automatic power-off protection structure under various conditions in the control part, the safety of the device during operation is greatly improved. When accidents such as autoclave leakage occur, the heating device can be automatically powered off through the alarm system, which can play a good protective role for both the sample material and the equipment.

[0060] During the operation of the equipment, the water chemistry loop monitoring and acquisition system 62 can monitor and store the temperature, pressure, dissolved hydrogen and dissolved oxygen in real time. The water chemistry loop monitoring and acquisition system 62 is provided with a temperature monitoring and acquisition interface 63, a pressure monitoring and acquisition interface 64, a dissolved hydrogen monitoring and acquisition interface 65, a dissolved oxygen monitoring and acquisition interface 66, and a pH monitoring and acquisition interface 67. The temperature monitoring and acquisition interface 63 is connected to the thermocouple 37 to display and record the temperature inside the autoclave in real time and feedback it to the temperature control system 51. The pressure monitoring and acquisition interface 64 is connected to the pressure gauge 10 to display and record the pressure inside the autoclave in real time and feedback it to the pressure control system 49. The dissolved hydrogen monitoring and acquisition interface 65 is connected to the dissolved hydrogen probe display 69 to display and record the dissolved hydrogen in the water chemistry loop in real time and feedback it to the dissolved hydrogen control system 47. The dissolved oxygen monitoring and acquisition interface 66 is connected to the dissolved oxygen probe display 70 to display and record the dissolved oxygen in the water chemistry loop in real time and feedback it to the dissolved oxygen control system 48. At the same time, the pH monitoring and acquisition interface 67 is connected to the pH probe display 72 to display and record the pH of the solution in real time. The conductivity probe display 71 displays and records the conductivity of the solution in real time.

[0061] In addition, the control cabinet is connected to the computer through the computer connection port 61. The computer is set with data monitoring and acquisition software. All the data of the control cabinet can be synchronously displayed on the operation interface of this software and the data can be exported through this software. Control cabinet handles 68 are relatively installed in the middle of the two opposed control cabinet doors. On one side of the lower part of the control cabinet, there is a control cabinet heat dissipation device 60 and a computer connection port 61. On the other side of the lower part of the control cabinet, there is a radiator switch 73 and a control cabinet switch 74 corresponding to the control cabinet heat dissipation device 60.

[0062] As Figure 1 - Figure 3 shown, the usage method of the high-temperature and high-pressure water impact fretting wear test device of the present invention is as follows:

[0063] 1. Shake the hand crank of the hand-operated hydraulic pump 35 to provide hydraulic power and drive the positioning plate 6 to slowly rise, thereby opening the kettle lid 3.

[0064] 2. Fix the impact material B41 on the impact material B fixture 42, and install it on the fixed base 43. Then install the fixed base 43 of the impact material B fixture 42 on the normal impact shaft 26 and tighten it with bolts.

[0065] 3. Install the impacted material A40 on the impacted material A fixture 38, and install the impacted material A fixture 38 at a fixed position in the inner cavity of the autoclave through nuts and fixed struts 39. Tighten all fastening structures.

[0066] 4. Adjust the position of the impacted material A fixture 38 so that the impact material B41 and the impacted material A40 are relatively horizontal and there is a certain gap. Open the cooling water switch to fill the cooling water jacket 22 with cooling water.

[0067] 5. Place the metal sealing ring 44 at the groove at the upper end of the autoclave body 2. Open the air release valve of the hydraulic pump 35, slowly lower the autoclave cover 3 until the groove at its lower end is tightly combined with the metal sealing ring 44, and tighten the autoclave cover fastening bolts 13 to make the two combined into a tightly closed autoclave.

[0068] 6. Open the high-temperature and high-pressure water circulation loop to fill the autoclave with solution. At the same time, adjust the pressure in the autoclave to the required test value through the back pressure valve of the water circulation loop.

[0069] 7. According to the test requirements, set the dissolved hydrogen and dissolved oxygen concentrations through the dissolved hydrogen control interface 47 and the dissolved oxygen control interface 48. Open the nitrogen, air, and hydrogen valves of the water chemistry loop to automatically adjust the dissolved hydrogen and dissolved oxygen concentrations.

[0070] 8. According to the test requirements, set the target temperature and the corresponding over-temperature (low-temperature) alarm limit temperature through the preheater control interface 50 and the autoclave heating control interface 51, and start. Set the corresponding over-pressure (low-pressure) alarm limit pressure through the pressure control interface 49 and start. After heating for a period of time, when the temperature reaches the set value, keep it at a constant temperature for a certain time.

[0071] 9. According to the mechanical parameter requirements of the test, set the target amplitude on the impact amplitude control interface 56; set the target frequency through the impact frequency control interface 57; set the target normal force on the normal force control interface 58 and set the alarm emergency stop parameters. Turn on the switch of the fatigue testing machine 30 to carry out the impact fretting wear test in high-temperature and high-pressure water, and collect and feedback-adjust the measured information in real time.

[0072] 10. After reaching the target impact time, turn off the switch of the fatigue testing machine 30 and cool down the temperature through the programs of the preheater control interface 50 and the autoclave heating control interface 51.

Claims

1. A high-temperature and high-pressure water impact fretting wear test device, characterized in that, The structure of the device is as follows: The autoclave adopts a vertical structure with a lower base, a middle kettle body and an upper kettle cover, which are connected in sequence from bottom to top. The autoclave is fixed on the bench through the lower base. The horizontal bench is supported by four bench columns. A driving mechanism is arranged below the base. The middle kettle body is installed on the lower base. A horizontal positioning plate is arranged above the kettle cover. The top of the kettle cover is connected to the middle of the positioning plate through four autoclave lifting bolts. The upper kettle cover is connected to two columns on the bench through the positioning plate, and the positioning plate is connected to the hydraulic pump; A metal sealing ring is used for sealing between the kettle cover and the kettle body and fastened with bolts; A metal sealing ring is used for sealing between the kettle body and the base and fastened with bolts; The inner cavity of the autoclave is provided with the material A to be impacted, the fixture for the material A to be impacted, the impact material B, and the fixture for the impact material B. The normal impact shaft connected to the driving mechanism extends from the base to the inner cavity of the autoclave and corresponds to the lower side of the impact material B in the inner cavity of the autoclave. The material A to be impacted is installed on the fixture for the material A to be impacted, and the impact material B is installed on the fixture for the impact material B. The material A to be impacted and the impact material B are vertically corresponding to each other. The fixture for the impact material B is fixed to the top end of the normal impact shaft through a fixed base. The up and down movement of the impact material B is driven by the movement of the normal impact shaft to perform normal impact on the material A to be impacted, so as to realize the impact fretting wear test.

2. The high-temperature and high-pressure water impact fretting wear test device according to claim 1, characterized in that, The positioning plate is sleeved on two columns on the bench through two inner holes respectively. An upper limit collar and a lower limit collar are provided on each column. The two upper limit collars and the two lower limit collars are aligned horizontally. The bottom of the two inner holes of the positioning plate is nested with positioning plate sliders. The positioning plate is slidably matched with the columns through the positioning plate sliders. The positioning plate and the positioning plate sliders are located between the upper limit collar and the lower limit collar; Both sides of the positioning plate are connected to the hydraulic pump through hydraulic devices. The hydraulic devices connected to the hydraulic pump are located on both sides of the columns. The hydraulic pump is provided with a hand rocker and a bleed valve. The hydraulic pump provides hydraulic power for driving the sliding of the positioning plate.

3. The high-temperature and high-pressure water impact fretting wear test device according to claim 1, characterized in that, The driving mechanism is arranged below the base and includes an upper support plate, support columns, a lower support plate, an upper baffle, drive struts, a lower baffle, a normal impact shaft, a transmission shaft, a fatigue testing machine, a sonic detection displacement sensor, and a reflection baffle. The upper support plate and the lower support plate are arranged parallel to each other vertically. The lower support plate is connected to the upper support plate by four support columns. A pressure balance system is arranged between the top of the upper support plate and the bottom of the base. A cooling water jacket is arranged outside the pressure balance system. The fatigue testing machine is arranged at the bottom of the lower support plate. A transmission bracket is arranged between the upper support plate and the lower support plate. The transmission bracket is composed of an upper baffle and a lower baffle which are arranged parallel to each other vertically and connected by four drive struts. The vertical normal impact shaft sequentially passes through the upper baffle of the drive strut, the upper support plate, the pressure balance system, the cooling water jacket, and the base. The upper end of the normal impact shaft extends into the autoclave. The normal impact shaft and the base are sealed by a sealing ring. The normal impact shaft passes through the central hole of the upper baffle and is connected and fixed to the upper baffle by a nut. The transmission shaft of the fatigue testing machine passes through the central hole of the lower support plate and is connected to the lower baffle, so that the lower baffle is fixed on the transmission shaft. The sonic detection displacement sensor is arranged on the lower support plate, and the reflection baffle corresponding to the sonic detection displacement sensor is installed on the lower baffle to measure and control the impact amplitude in real time.

4. The high-temperature and high-pressure water impact fretting wear test device according to claim 3, characterized in that, A pressure sensor is built into the normal impact shaft. The pressure sensor is located in the area of the cooling water jacket, collects the normal force during the impact fretting wear process, and is connected to the normal force regulator and the display of the control system. A pressure balance system is arranged between the normal impact shaft and the autoclave. The normal impact shaft and the pressure balance system are sealed by a sealing ring to offset the acting force generated by the high pressure, so as to realize the accurate measurement and control of the normal force.

5. The high-temperature and high-pressure water impact fretting wear test device according to claim 1, characterized in that, The normal impact shaft extends into the kettle body and corresponds to the impact material B. The fixed base of the impact material B fixture is fixed to the upper end of the normal impact shaft by four bolts. The impact material B fixture is fixed to the top of the fixed base by four screws. The impact material B is fixed to the impact material B fixture by bolts, so that the impact material B is tightly connected to the normal impact shaft. The fixture of the impacted material A is fixed in the inner cavity of the autoclave by four fixed struts and nuts. The impacted material A is fixed to the fixture of the impacted material A by nuts. The upper side of the impact material B corresponds to the lower side of the impacted material A.

6. The high-temperature and high-pressure water impact fretting wear test device according to claim 1, characterized in that, The impact material B fixture is designed according to the dimensions of the cladding tube and the heat transfer tube. The impact material B is tubular, and its bottom should be arc-shaped and adapted to the impact material B fixture, and fit tightly. At the same time, the impacted material A is designed as a sheet, plate, spring or rigid convex body. The fixture of the impacted material A is designed according to the dimensions of the sheet, plate, spring or rigid convex body to realize the contact form of tube-plate or tube-grid contact. The impacted material A and the impact material B are in linear contact, and the two form a friction pair. The impact material B fixture and the fixed base, the fixture of the impacted material A and the fixed struts are processed from stainless steel, nickel-based alloy or zirconium alloy.

7. The high-temperature and high-pressure water impact fretting wear test device according to claim 1, characterized in that, A bottom ceramic heating jacket is provided on the outer side of the base, a middle ceramic heating jacket is provided on the outer side of the kettle body, and a top ceramic heating jacket is provided on the outer side of the kettle cover. The top ceramic heating jacket, the middle ceramic heating jacket, and the lower ceramic heating jacket form a three-layer annular heating device from top to bottom to achieve uniform temperature in the inner cavity of the autoclave. At the same time, a thermocouple is inserted into the inner cavity of the autoclave through a thermocouple mounting seat at the bottom of the base. The thermocouple mounting seat is fixedly connected to the base through a thermocouple fixing bolt to monitor and control the temperature in the kettle in real time.

8. The high-temperature and high-pressure water impact fretting wear test device according to claim 1, characterized in that, The inner cavity of the autoclave is connected to a water chemical circuit. The structure of the water chemical circuit is as follows: a liquid inlet pipe and an exhaust pipe communicating with the inner cavity of the autoclave penetrate through the side of the base. One end of the liquid inlet pipe is connected to the water chemical environment, and the other end of the liquid inlet pipe is located at the bottom of the inner cavity of the autoclave. One end of the exhaust pipe is located in the upper part of the inner cavity of the autoclave. A liquid inlet valve, a pressure sensor, a pressure gauge, and a safety valve are installed on the liquid inlet pipe, and an exhaust valve is installed on the exhaust pipe.

9. The high-temperature and high-pressure water impact fretting wear test device according to claim 1, characterized in that, The device is equipped with a control system and a data monitoring and acquisition system, mainly including displays, controllers, and regulators for temperature, pressure, amplitude, frequency, and normal force. The temperature controller is connected to the temperature display, an over-temperature or low-temperature alarm device. The pressure controller is connected to the pressure display, an over-pressure or low-pressure alarm device. The impact amplitude regulator is connected to the impact amplitude display. The frequency regulator is connected to the frequency display. The normal load regulator is connected to the normal load display. Each controller and regulator are respectively connected to a relay in the control system. The relay is connected to the heating wires in the top ceramic heating jacket, the middle ceramic heating jacket, and the bottom ceramic heating jacket through wires. A heating power switch and a heating indicator are provided on the wires to form a power-off protection structure for over-temperature, low-temperature, over-pressure, and low-pressure.

10. A method for using the high-temperature and high-pressure water impact fretting wear test device according to any one of claims 1 to 9, characterized in that, It includes the following steps: (1) Drive the hydraulic pump through the hand crank to provide hydraulic power and drive the positioning plate to rise to open the kettle cover; (2) Fix the impact material B on the impact material B fixture and install it on the fixed base. Install the fixed base of the impact material B fixture on the normal impact shaft and tighten it with bolts; (3) Install the material A to be impacted on the material A fixture to be impacted, and install the material A fixture to be impacted at a fixed position in the inner cavity of the autoclave through nuts and fixed struts, and tighten all fastening structures; (4) Adjust the position of the material A fixture to be impacted so that the impact material B and the material A to be impacted are relatively horizontal and have a gap; open the cooling water switch to fill the cooling water jacket with cooling water; (5) Place a metal sealing ring at the groove at the upper end of the kettle body; open the air release valve of the hydraulic pump, lower the kettle cover until its lower groove is tightly combined with the metal sealing ring, and tighten the kettle cover fastening bolts to make the two combined into a tightly closed autoclave; (6) Open the high-temperature and high-pressure water circulation circuit to fill the autoclave with solution, and at the same time, adjust the pressure in the autoclave to the required test value through the back pressure valve of the water circulation circuit; (7) According to the test requirements, set the dissolved hydrogen and dissolved oxygen concentrations through the dissolved hydrogen control interface and the dissolved oxygen control interface, and open the nitrogen, air, and hydrogen valves of the water chemical circuit to automatically adjust the dissolved hydrogen and dissolved oxygen concentrations; (8) According to the test requirements, set the target temperature and the corresponding over-temperature or low-temperature alarm limit temperature through the preheater control interface and the autoclave heating control interface, and start; set the corresponding over-pressure or low-pressure alarm limit pressure through the pressure control interface, and start; after heating up for a period of time, the temperature reaches the set value and is kept warm; (9) According to the mechanical parameter requirements of the test, set the target amplitude on the impact amplitude control interface; set the target frequency through the impact frequency control interface; set the target normal force on the normal force control interface, and set the alarm emergency stop parameters; turn on the switch of the fatigue testing machine, conduct the impact fretting wear test in high-temperature and high-pressure water, and collect and feedback-adjust the measured information in real time; (10) After reaching the target impact time, turn off the switch of the fatigue testing machine, and cool down the temperature through the programs of the preheater control interface and the autoclave heating control interface.

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