A high-temperature and high-pressure composite fretting wear test device

Abstract

The present invention provides a high-temperature and high-pressure combined fretting wear test device, which includes a main frame and a moving body installed on the main frame. The moving body includes a kettle body, a kettle cover and a driving device. The kettle body and the kettle cover form a sealed chamber. The moving body further includes: a pull rod shaft that penetrates the kettle body in a first direction. A second specimen fixture is installed on the part of the pull rod shaft located in the chamber of the kettle body, and both sides of the second specimen fixture are used for clamping a second specimen; a first loading shaft that penetrates the right side of the kettle body in a second direction. A first specimen fixture is installed at the first end of the first loading shaft located in the chamber of the kettle body, and the first specimen fixture is used for clamping a first specimen; a second loading shaft that penetrates the left side of the kettle body in the second direction. A third specimen fixture is installed at the first end of the second loading shaft located in the chamber of the kettle body, and the third specimen fixture is used for clamping a third specimen. The present invention can simulate a combined fretting wear test under a high-temperature and high-pressure environment.

Description

Technical Field

[0001] The present invention relates to the technical field of stress corrosion material research, and specifically, to a high-temperature and high-pressure combined fretting wear test device. Background Art

[0002] With the development of material science in China, the research on fretting wear of materials has become increasingly in-depth, meeting the needs of material research in cutting-edge industries such as nuclear power and aerospace. Currently, there are many devices on the market for single radial impact fretting wear or single tangential fretting wear, etc., but these devices cannot well simulate the actual working conditions. To simulate the actual working conditions, achieve combined fretting wear of radial impact fretting and tangential fretting at a relatively high frequency under high temperature and high pressure, and accurately measure and control the fretting amplitude and frequency, there are certain difficulties in technology.

[0003] Currently, the existing high-temperature and high-pressure combined fretting wear devices in the domestic industry or the corresponding devices on the market have the following defects:

[0004] 1. The device is simple. The autoclave body is placed vertically, and the driving mechanism uses mechanical or electromagnetic vibrators, etc., with a small driving force or vibration frequency. In addition, the device will have large vibrations, causing great interference to the measurement and affecting the measurement accuracy of the data.

[0005] 2. The device has a single function and is only suitable for simulating a single working condition, such as single tangential fretting wear or single radial impact wear.

[0006] 3. The test efficiency is low, and it can only test the fretting wear of one set of specimens at the same time. Summary of the Invention

[0007] Aiming at the defects in the prior art, the purpose of the present invention is to provide a high-temperature and high-pressure combined fretting wear test device, which solves the difficulty of not being able to simultaneously perform combined fretting of radial impact fretting and tangential fretting under high temperature and high pressure in the current industry, realizes combined fretting wear in a high-temperature and high-pressure environment, and has high test efficiency.

[0008] To solve the above problems, in the first aspect, the present invention provides a high-temperature and high-pressure combined fretting wear test device, including a main frame and a moving body installed on the main frame. The moving body includes an autoclave body, an autoclave cover, and a driving device. The autoclave body and the autoclave cover form a sealed chamber. The moving body further includes:

[0009] A pull rod shaft that penetrates the autoclave body in a first direction. A second specimen clamp is installed on the part of the pull rod shaft located in the autoclave body chamber, and both sides of the second specimen clamp are used to clamp a second specimen;

[0010] A first loading shaft penetrates through the right side of the autoclave body in a second direction. A first specimen fixture is installed at the first end of the autoclave body chamber on the first loading shaft, and this first specimen fixture is used to clamp a first specimen.

[0011] A second loading shaft penetrates through the left side of the autoclave body in a second direction. A third specimen fixture is installed at the first end of the autoclave body chamber on the second loading shaft, and this third specimen fixture is used to clamp a third specimen.

[0012] Wherein, in the working state of the high-temperature and high-pressure compound fretting wear test device, the driving device can drive the first specimen clamped by the first specimen fixture and the third specimen clamped by the third specimen fixture to simultaneously perform fretting wear tests in a first direction and a second direction with the second specimen clamped on both sides of the second specimen fixture.

[0013] Optionally, the first direction is the vertical direction, the second direction is the horizontal direction, the second specimen and the first specimen and the third specimen make small reciprocating motions in the vertical direction, and achieve periodic impact or constant loading in the horizontal direction.

[0014] Optionally, there are four through holes symmetrically distributed around the autoclave body in the up, down, left, and right directions. The pull rod shaft penetrates through the upper and lower two through holes of the autoclave body in the vertical direction, the first loading shaft penetrates through the right through hole of the autoclave body, and the second loading shaft penetrates through the left through hole of the autoclave body.

[0015] Optionally, the first end of the first loading shaft is installed on a first auxiliary support device provided in the autoclave body, and the first end of the second loading shaft is installed on a second auxiliary support device provided in the autoclave body.

[0016] Optionally, the first loading shaft and the second loading shaft are coaxially arranged.

[0017] Optionally, both sides of the second specimen fixture are used to clamp a plate-shaped second specimen, and the first and third specimen fixtures are used to clamp tubular or spherical first and third specimens.

[0018] Optionally, force sensors are respectively connected to both ends of the pull rod shaft, and force sensors are respectively connected to the second ends of the first and second loading shafts far from the autoclave body.

[0019] Optionally, one end of the force sensor is connected to a connecting shaft, and the other end of the connecting shaft is connected to the driving device.

[0020] Optionally, the connecting shaft is also connected to a guiding device, the guiding device is installed on a fixed seat, and the guiding device plays a role of guiding and preventing rotation.

[0021] Optionally, the main frame includes a mounting plate, a platform, a right vertical column, an upper cross beam, a left vertical column, and a lower cross beam. The mounting plate is vertically fixed to the left and right vertical columns by bolts, and the moving body is vertically mounted on the mounting plate.

[0022] Optionally, a measuring chuck is mounted on the second specimen fixture. Measuring rods are vertically mounted and clamped at both ends of the measuring chuck. The measuring rods cooperate with the LVDT displacement sensors on both sides to directly measure the up-and-down amplitude of the specimen in the autoclave.

[0023] In a second aspect, the present invention also provides a high-temperature and high-pressure fretting wear test device, which includes a main frame and a moving body mounted on the main frame. The moving body includes an autoclave body, an autoclave cover, and a driving device. The autoclave body and the autoclave cover form a sealed chamber. The moving body further includes:

[0024] A pull rod shaft penetrates the autoclave body in a first direction. A second specimen fixture is mounted on a part of the shaft of the pull rod shaft located in the chamber of the autoclave body. The second specimen fixture is used for clamping a second specimen.

[0025] A first loading shaft penetrates the right side of the autoclave body in a second direction. A first specimen fixture is mounted at the first end of the first loading shaft located in the chamber of the autoclave body. The first specimen fixture is used for clamping a first specimen.

[0026] A second loading shaft penetrates the left side of the autoclave body in a second direction. The first end of the second loading shaft located in the chamber of the autoclave body is fixedly connected to the second specimen fixture.

[0027] Wherein, in the working state of the high-temperature and high-pressure fretting wear test device, the driving device can drive the first specimen clamped by the first specimen fixture and the second specimen clamped by the second specimen fixture to simultaneously perform fretting wear tests in the first direction and the second direction.

[0028] Optionally, the first direction is the vertical direction, the second direction is the horizontal direction. The second specimen and the first specimen make small reciprocating motions in the vertical direction and achieve periodic impact or constant loading in the horizontal direction.

[0029] Optionally, the first end of the first loading shaft is mounted on a first auxiliary support device provided in the autoclave body, and the first end of the second loading shaft is mounted on a second auxiliary support device provided in the autoclave body.

[0030] In a third aspect, the present invention also provides a high-temperature and high-pressure fretting wear test device, which includes a main frame and a moving body mounted on the main frame. The moving body includes an autoclave body, an autoclave cover, and a driving device. The autoclave body and the autoclave cover form a sealed chamber. The moving body further includes:

[0031] The pull rod shaft penetrates through the autoclave body in the first direction. A second specimen fixture is installed on a part of the shaft of the pull rod shaft located in the chamber of the autoclave body, and this second specimen fixture is used to clamp a second specimen.

[0032] The first loading shaft penetrates through the right side of the autoclave body in the second direction. The first end of the first loading shaft located in the chamber of the autoclave body is fixedly connected to the second specimen fixture.

[0033] The second loading shaft penetrates through the left side of the autoclave body in the second direction. A third specimen fixture is installed at the first end of the second loading shaft located in the chamber of the autoclave body, and this third specimen fixture is used to clamp a third specimen.

[0034] Wherein, in the working state of the high-temperature and high-pressure compound fretting wear test device, the driving device can drive the second specimen clamped by the second specimen fixture and the third specimen clamped by the third specimen fixture to simultaneously perform fretting wear tests in the first direction and the second direction.

[0035] Optionally, the first direction is the vertical direction, the second direction is the horizontal direction, the second specimen and the third specimen make small reciprocating motions in the vertical direction, and achieve periodic impact or constant loading in the horizontal direction.

[0036] Optionally, the first end of the first loading shaft is installed on a first auxiliary support device provided in the autoclave body, and the first end of the second loading shaft is installed on a second auxiliary support device provided in the autoclave body.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. For the high-temperature and high-pressure compound fretting wear test device of the present invention, the two sides of the second specimen fixture are used to clamp the second specimen, the first end of the first loading shaft is used to clamp the first specimen, and the first end of the second loading shaft is used to clamp the third specimen. In the working state of the high-temperature and high-pressure compound fretting wear test device, the driving device can drive the first specimen clamped by the first specimen fixture and the third specimen clamped by the third specimen fixture to respectively perform fretting wear tests in the first direction and the second direction with the second specimen clamped on both sides of the second specimen fixture simultaneously.

[0039] 2. For the high-temperature and high-pressure compound fretting wear test device of the present invention, both sides of the second specimen fixture are used to clamp the second specimen, and respectively perform fretting wear with the first and third specimens clamped on the first and second specimen fixtures, so that the fretting wear of two sets of specimens can be carried out simultaneously, improving the test efficiency.

[0040] 3. According to the test requirements, the second specimen fixture of the high-temperature and high-pressure combined fretting wear test device of the present invention can be fixed to the first loading shaft or the second loading shaft through a mounting connector. The second specimen can be installed only on the left or right side of the second specimen fixture. The second specimen can conduct a fretting wear test with the first specimen installed at the first end of the first loading shaft or the third specimen installed at the first end of the second loading shaft, thereby realizing the simulation test of high-temperature and high-pressure combined fretting wear in the first direction and the second direction for a single set of specimens. Description of the Drawings

[0041] By reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings, other features, objectives, and advantages of the present invention will become more apparent:

[0042] Figure 1 Structural diagram of the high-temperature and high-pressure combined fretting wear test device provided by the embodiment of the present invention;

[0043] Figure 2 Structural diagram of the main frame of the high-temperature and high-pressure combined fretting wear test device provided by the embodiment of the present invention;

[0044] Figure 3 Cross-sectional view of the moving body of the high-temperature and high-pressure combined fretting wear test device provided by the embodiment of the present invention;

[0045] Figure 4 Structural diagram of the inside of the autoclave and vibration amplitude measurement;

[0046] Figure 5 Cross-sectional view of the inside of the autoclave and vibration amplitude measurement;

[0047] Figure 6 Structural diagram of the main frame provided by another embodiment of the present invention.

[0048] Description of the reference numerals in the drawings: 1: Main frame; 2: Moving body; 3: Autoclave cover; 4: Mounting plate; 5: Platform; 6: Right column; 7: Upper cross beam; 8: Left column; 9: Lower cross beam; 10, 37: Hydraulic cylinder; 11, 21, 23, 36: Fixed seat; 12, 20, 28, 35: Guide device; 13, 19, 27, 34: Connecting shaft; 14, 18, 26, 33: Force sensor; 15, 17, 24, 32: Cooling sleeve; 16: First loading shaft; 22: Autoclave; 25: Second loading shaft; 29: Threaded loading shaft; 30: Handwheel; 31: Tie rod shaft; 38, 40: LVDT displacement sensor device; 39, 41: Measuring rod; 42: Measuring chuck; 43: First auxiliary support device; 44: First specimen fixture; 45: Second specimen fixture; 46: Second auxiliary support device; 47: Third specimen fixture. Detailed Description of the Embodiment

[0049] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can be made. These all belong to the protection scope of the present invention.

[0050] Figure 1 It is a structural diagram of a high-temperature and high-pressure composite fretting wear test device provided by an embodiment of the present invention. Figure 2 It is a structural diagram of the main frame of a high-temperature and high-pressure composite fretting wear test device provided by an embodiment of the present invention; as Figure 1 、 Figure 2 shown, the high-temperature and high-pressure composite fretting wear test device of the present invention includes: a main frame 1 and a moving body 2 installed on the main frame 1. The main frame 1 includes a mounting plate 4, a platform 5, a right column 6, an upper cross beam 7, a left column 8, and a lower cross beam 9. Among them, the mounting plate 4 is vertically fixed to the left and right columns 6 and 8 by bolts, and the moving body 2 is vertically installed on the mounting plate 4. Among them, in this embodiment, the mounting plate 4 is processed from a whole piece of plate, thereby ensuring the dimensional installation accuracy of the main operating components of the device, while ensuring strength and reducing measurement errors caused by vibration.

[0051] In addition, in an alternative embodiment, the overall structure of the main frame 1 remains unchanged, and the structures of the two left and right columns can be slightly deformed and modified as Figure 6 shown.

[0052] Figure 3 It is a cross-sectional view of the moving body of a high-temperature and high-pressure composite fretting wear test device provided by an embodiment of the present invention. As Figure 3 shown, the moving body 2 includes a kettle body 22, a kettle cover 3, and a driving device. The kettle body 22 and the kettle cover 3 form a sealed chamber. Four through holes are symmetrically distributed around the kettle body 22 in the up, down, left, and right directions.

[0053] Specifically, a hydraulic cylinder 10 is installed on a fixed seat 11. A guiding device 12 connects the piston rod of the hydraulic cylinder 10 with a connecting shaft 13. A force sensor 14 is connected between the connecting shaft 13 and a first loading shaft 16. A cooling sleeve 15 is installed outside the first loading shaft 16 and the force sensor 14. The cooling sleeve 15 is fixed to the kettle body 22. A first specimen fixture is installed at the first end of the first loading shaft 16 located in the chamber of the kettle body. The cooling sleeve 15 is used to reduce the temperature of the space surrounded by the cooling sleeve. The guiding device 12 plays a guiding and anti-rotation role, and is used to restrict the reciprocating movement of the radial (horizontal direction) loading mechanism. The hydraulic cylinder 10 provides a driving force and displacement in the radial direction, and high-frequency reciprocating movement or maintaining the required loading force can be achieved through a hydraulic servo valve and a corresponding controller. The force sensor 14 is used to measure the loading force in real time.

[0054] Similarly, the hydraulic cylinder 37 is installed on the fixed seat 36. The guiding device 35 connects the piston rod of the hydraulic cylinder 37 with the connecting shaft 34. A force sensor 33 is connected between the connecting shaft 34 and the pull rod shaft 31. A cooling sleeve 32 is installed outside the pull rod shaft 31 and the force sensor 33. The pull rod shaft 31 penetrates through the upper and lower through holes of the kettle body in the tangential direction (vertical direction). The lower end of the pull rod shaft 31 is connected to the force sensor 33, the upper end of the pull rod shaft 31 is connected to the force sensor 18, the other end of the force sensor 18 is connected to the connecting shaft 19. The guiding device 20 is installed on the fixed seat 21 and is connected to the connecting shaft 19. The guiding devices 20 and 35 are used to restrict the reciprocating motion in the vertical direction, playing a role in guiding and preventing rotation. A second specimen fixture is installed on the part of the pull rod shaft 31 located in the chamber of the kettle body.

[0055] The handwheel 30 is installed at one end of the threaded loading shaft 29. One end of the threaded loading shaft 29 is connected to the guiding device 28 through a spherical plain bearing. The guiding device 28 is fixed on the fixed seat 23. The guiding device 28 is also connected to the connecting shaft 27. A force sensor 26 is connected between the connecting shaft 27 and the second loading shaft 25. A third specimen fixture is installed at the first end of the second loading shaft 25 located in the chamber of the kettle body. A cooling sleeve 24 is installed outside the second loading shaft 25 and the force sensor 26. The rotation motion between the threaded loading shaft 29 and the fixed seat 23 is converted into a horizontal motion through a rotating thread, so as to provide a horizontal driving force.

[0056] In an alternative embodiment, a hydraulic cylinder can also be used to replace the handwheel 30 as the driving device.

[0057] The first loading shaft 16 penetrates through the right through hole of the kettle body 22, and the second loading shaft 25 penetrates through the left through hole of the kettle body. The first and third specimen fixtures are respectively installed at the first end of the first loading shaft 16 and the second loading shaft 25 located in the chamber of the kettle body. The pull rod shaft 31 penetrates through the upper and lower through holes of the kettle body 22 in the vertical direction. A second specimen fixture is installed on the part of the pull rod shaft 31 located in the chamber of the kettle body.

[0058] Figure 4 It is a structural diagram of inside the kettle body and vibration amplitude measurement. Figure 5 It is a cross-sectional view of inside the kettle body and vibration amplitude measurement, as Figure 4 and Figure 5As shown, the LVDT displacement measurement device 38 and the LVDT displacement measurement device 40 are installed outside the kettle body 22 and are respectively connected to the measurement chucks 42 through the measurement rods 39 and 41. The measurement chuck 42 is fixed on the second specimen fixture 45. In the second specimen fixture 45 of the present invention, the measurement chuck 42 is installed, and the measurement rods 39 and 41 are clamped at both ends of the chuck. The measurement rods cooperate with the LVDT displacement sensors on both sides to directly measure the up and down amplitudes (reciprocating displacements) of the specimen in the kettle body. The measured data is more accurate than the data measured by a single LVDT after data processing. And the measurement rods are installed vertically, avoiding the vibration caused by the self-weight of the measurement rods during horizontal installation.

[0059] The first specimen fixture 44 is fixed to the first end of the first loading shaft 16 and is supported by the first auxiliary support device 43 inside the kettle. The third specimen fixture 47 is fixed to the first end of the second loading shaft 25 and is supported by the second auxiliary support device 46 inside the kettle. The second specimen fixture 45 is fixed to the pull rod shaft 31. The pull rod shaft 31 drives the second specimen fixture 45 to move up and down reciprocally under the drive of the hydraulic cylinder 37. The second specimen clamped on both sides of the second specimen fixture 45 and the first specimen clamped by the first specimen fixture 44 and the third specimen clamped by the third specimen fixture 47 form relative movements. Specifically, they make small reciprocating movements (up and down vibrations) in the first direction, i.e., the vertical direction, and achieve periodic impacts or constant loading in the second direction, i.e., the horizontal direction. Thus, the high-temperature and high-pressure combined fretting wear test in the first direction and the second direction can be carried out simultaneously. And the fretting wear of two sets of specimens can be carried out simultaneously, improving the test efficiency. In the embodiment of the present invention, the second specimen is a plate-shaped specimen, and the first specimen and the third specimen are tubular or spherical specimens.

[0060] In this embodiment, the first loading shaft 16 and the second loading shaft 25 are coaxially arranged.

[0061] In an alternative embodiment, according to the test requirements, the second specimen fixture 45 can be fixed to the first loading shaft 16 or the second loading shaft 25 through the installation connecting piece. The second specimen can be installed only on the left or right side of the second specimen fixture 45. This second specimen can carry out the fretting wear test with the first specimen installed at the first end of the first loading shaft 16 or the third specimen at the first end of the second loading shaft 25. Thus, the high-temperature and high-pressure combined fretting wear simulation test of a single set of specimens in the first direction and the second direction can also be realized.

[0062] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments. Those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A high-temperature and high-pressure composite fretting wear test device, characterized in that, Comprising: A main frame and a moving body mounted on the main frame. The moving body includes a kettle body, a kettle cover and a driving device. The kettle body and the kettle cover form a sealed chamber. The moving body further includes: A pull rod shaft that penetrates the kettle body in a first direction. A second specimen fixture is installed on the part of the pull rod shaft located in the chamber of the kettle body. Both sides of the second specimen fixture are used for clamping a second specimen. A first loading shaft that penetrates the right side of the kettle body in a second direction. A first specimen fixture is installed at the first end of the first loading shaft located in the chamber of the kettle body. The first specimen fixture is used for clamping a first specimen. A second loading shaft that penetrates the left side of the kettle body in a second direction. A third specimen fixture is installed at the first end of the second loading shaft located in the chamber of the kettle body. The third specimen fixture is used for clamping a third specimen. Wherein, in the working state of the high-temperature and high-pressure compound fretting wear test device, the driving device can drive the first specimen clamped by the first specimen fixture and the third specimen clamped by the third specimen fixture to simultaneously perform fretting wear tests in the first direction and the second direction with the second specimens clamped on both sides of the second specimen fixture respectively; the first direction is the vertical direction, the second direction is the horizontal direction, the second specimens and the first and third specimens make small reciprocating motions in the vertical direction and achieve periodic impact or constant loading in the horizontal direction. The hydraulic cylinder is installed on the fixed seat, and the guiding device connects the piston rod of the hydraulic cylinder with the connecting shaft. Both ends of the pull rod shaft are respectively connected with force sensors. The second ends of the first and second loading shafts far from the kettle body are respectively connected with force sensors. One end of the force sensor is connected with a connecting shaft, and the other end of the connecting shaft is connected with the driving device.

2. The high-temperature and high-pressure composite fretting wear test device according to claim 1, characterized in that, Four through holes, namely upper, lower, left and right through holes, are symmetrically distributed around the kettle body. The pull rod shaft penetrates the upper and lower through holes of the kettle body in the vertical direction. The first loading shaft penetrates the right through hole of the kettle body, and the second loading shaft penetrates the left through hole of the kettle body.

3. The high-temperature and high-pressure composite fretting wear test device according to claim 1, characterized in that, The first end of the first loading shaft is installed on a first auxiliary support device arranged in the kettle body, and the first end of the second loading shaft is installed on a second auxiliary support device arranged in the kettle body.

4. The high-temperature and high-pressure composite fretting wear test device according to claim 1, characterized in that, The first loading shaft and the second loading shaft are coaxially arranged.

5. The high-temperature and high-pressure composite fretting wear test device according to claim 1, characterized in that, Both sides of the second specimen fixture are used for clamping a plate-shaped second specimen, and the first and third specimen fixtures are used for clamping tubular or spherical first and third specimens.

6. The high-temperature and high-pressure composite fretting wear test device according to claim 1, characterized in that, The connecting shaft is also connected with the guiding device. The guiding device is installed on the fixed seat, and the guiding device plays a role of guiding and preventing rotation.

7. The high-temperature and high-pressure composite fretting wear test device according to claim 1, characterized in that, The main frame includes a mounting plate, a platform, a right column, an upper cross beam, a left column and a lower cross beam. The mounting plate is vertically fixed on the left and right columns by bolts, and the moving body is vertically installed on the mounting plate.

8. The high-temperature and high-pressure composite fretting wear test device according to claim 1, characterized in that, A measuring chuck is installed on the second specimen fixture. Measuring rods are vertically clamped at both ends of the measuring chuck. The measuring rods cooperate with LVDT displacement sensors on both sides to directly measure the up and down amplitudes of the specimens in the kettle.

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