A high-temperature and high-pressure fluid-lubricated rotating plane friction and wear testing device

Abstract

A high-temperature, high-pressure, fluid-lubricated rotating plane friction and wear testing device belongs to the field of extreme-condition tribological testing technology. The device consists of a lifting device and a loading cylinder, both secured to the top of a test bench support. The loading cylinder's piston rod is connected to a tension sensor and a water-cooled loading shaft. The water-cooled loading shaft is connected to the lower specimen (stationary ring) within the high-temperature, high-pressure test chamber via a spherical universal joint. The oil-cooled main shaft is connected to the upper specimen (dynamic ring) within the high-temperature, high-pressure test chamber via a locking nut. This ensures uniform axial load application when the water-cooled loading shaft and the oil-cooled main shaft are non-concentric, allowing the upper and lower specimen ends to align automatically. The upper portion of the high-temperature, high-pressure test chamber is connected to a water-cooling jacket, and the lower portion is connected to the bearing chamber. The high pressure in the test chamber is maintained by a high-pressure water station system, while the high temperature is regulated and controlled by an electric heater and the water-cooling jacket. This device can perform rotating sliding friction and wear testing on friction pairs in high-temperature, high-pressure water environments.

Description

Technical Field

[0001] The present invention relates to the technical field of extreme working condition tribology testing, and in particular to a rotary friction and wear testing device under a high-temperature and high-pressure fluid lubrication environment. Background Art

[0002] Extreme conditions tribology research is an important field that examines the behavior of friction, wear, and lubrication in extreme environments. These environments include high temperature, high pressure, low temperature, vacuum, corrosive conditions, and high loads, and are widely used in industries such as nuclear power, aerospace, petroleum and petrochemicals, machinery manufacturing, energy, and metallurgy. Mastering tribological testing techniques under extreme conditions is crucial to modern industry, as failure of equipment or components under these conditions can have serious consequences. Tribological testing can predict and evaluate the performance of materials under extreme conditions, thereby improving equipment safety and reliability, extending material service life, and reducing maintenance costs. It also provides a deeper understanding of the fundamental mechanisms of friction, wear, and lubrication, providing theoretical support and assurance for related technologies.

[0003] The key equipment for testing and evaluating the tribological properties of materials or surface coatings is typically a friction and wear testing device. The tribological properties of friction pair materials, such as friction coefficient, wear volume, and wear morphology, under different lubrication conditions, as well as wear mechanisms, are crucial areas of research in material friction and wear. Currently, the most commonly used friction and wear testing devices utilize three types of specimens: pin-on-disc, ring-on-block, and disk-on-disc, with reciprocating and rotary sliding modes. An axial load is applied to the end faces of the friction pair, and relative movement of the friction pair is achieved at a certain reciprocating frequency or circumferential rotational speed. Sensors collect data from the test specimen to obtain information such as the friction coefficient and wear volume of the friction pair. However, the friction and wear performance of the friction pair is affected by the operating environment. While some friction and wear testing devices can simulate ambient temperature and pressure water, oil, or air environments, none can simulate high-temperature, high-pressure water environments. Consequently, accurate testing and evaluation of the tribological performance of friction pair materials under these conditions is impossible. Summary of the Invention

[0004] The present invention provides a disc-disc or pin-disc high-speed rotating friction and wear test device capable of simulating a high-temperature and high-pressure water medium working environment, so as to solve the problems raised in the above background technology.

[0005] The technical solution adopted by the present invention is: a high-temperature and high-pressure fluid-lubricated rotating plane friction and wear testing device, which includes a test bench bracket, characterized in that: the test bench bracket fixes a lifting device, a loading cylinder, a bearing cavity and a drive motor from top to bottom; the upper part of the high-temperature and high-pressure test cavity in the device is connected to a water-cooling jacket, and the lower part of the high-temperature and high-pressure test cavity is connected to the bearing cavity;

[0006] In the lifting device, the worm gear reduction device drives the sprocket through the transmission shaft, and the sprocket engages with the chain; one end of the chain is connected to the high-temperature and high-pressure test chamber through a lifting lock, and the other end of the chain is connected to the counterweight beam after passing through the guide wheel; the sliders at both ends of the counterweight beam act on the linear guide rail to achieve the lifting and lowering of the high-temperature and high-pressure test chamber;

[0007] The piston rod of the loading cylinder is connected to the tension sensor and the water-cooled loading shaft. The water-cooled loading shaft passes through the water-cooling jacket and is inserted into the high-temperature and high-pressure test chamber. A spherical universal joint is provided on the end thereof. The driving motor is connected to one end of the oil-cooled main shaft through a coupling. The other end of the oil-cooled main shaft passes through the bearing chamber and is provided in the high-temperature and high-pressure test chamber.

[0008] In the high-temperature and high-pressure test chamber, the chamber gland, the chamber body, and the chamber chassis surround the external chamber through studs and stud nuts, and the interior of the external chamber is the test chamber; the sample in the test chamber is fixed on the sample fixing plate, and the sample fixing plate is locked on the oil-cooled spindle through a locking nut;

[0009] The lower sample piece is fixed on the lower sample piece fixing plate, and the lower sample piece fixing plate is connected to the loading shaft connecting plate through connecting studs and connecting nuts; the loading shaft connecting plate is connected to the spherical universal joint, and the end faces of the lower sample piece and the upper sample piece are self-adjusted and leveled when subjected to axial load.

[0010] The contact surface of the spherical universal joint is a convex and concave spherical surface. The convex spherical surface end is connected to the water-cooled loading shaft, and the concave spherical surface end is connected to the lower sample. When an axial load is applied, the axial load of the water-cooled loading shaft and the oil-cooled main shaft is evenly loaded in a non-concentric state.

[0011] In the water-cooling jacket, a water-cooling cavity is provided between the water-cooling outer cavity and the water-cooling inner cavity, and the inner ring of the water-cooling inner cavity cooperates with the water-cooling loading shaft.

[0012] An outer sealing ring is provided between the water-cooled outer cavity and the water-cooled inner cavity, and an inner sealing ring is provided between the water-cooled inner cavity and the water-cooled loading shaft.

[0013] A water-cooling joint is provided on the water-cooling outer cavity, and the water-cooling joint is communicated with the water-cooling cavity.

[0014] An inner water-cooling channel is provided in the water-cooling loading shaft.

[0015] A wound gasket is provided between the cavity body and the cavity cover and the cavity bottom plate respectively; an electric heater and a temperature sensor are provided on the external cavity; and a cooling channel is provided on the cavity body.

[0016] The bearing cavity includes a high-pressure mechanical seal, a baffle ring, a lip seal and a paired angular contact ball bearing. The high-pressure mechanical seal is arranged at the upper part of the bearing cavity, and the baffle ring is arranged at the bottom of the high-pressure mechanical seal, adopting an overflow structure. The paired angular contact ball bearing acts on the oil-cooled main shaft, and an oil seal cavity is arranged at the bottom of the paired angular contact ball bearing.

[0017] An oil cooling channel is provided inside the oil cooling main shaft, and a throttle tooth for isolating high-temperature fluid is provided outside the main shaft.

[0018] The device is also equipped with a gas control system, an oil station system, a high-pressure water station system, and a data acquisition and control system. The gas control system is connected to the loading cylinder for controlling the loading cylinder; the oil station system is connected to the bearing cavity, and the high-pressure water station system is connected to the high-temperature and high-pressure test cavity. The data acquisition and control system is electrically connected to the tension sensor, temperature sensor, torque sensor, gas control system, oil station system, and high-pressure water station system.

[0019] Specifically, the lifting device and the loading cylinder are fixed to the top of the test bench bracket at the same time, the piston rod of the loading cylinder is connected to the tension sensor and the water-cooled loading shaft, the water-cooled loading shaft is connected to the lower sample (static ring) in the high-temperature and high-pressure test chamber through a spherical universal joint, the oil-cooled main shaft and the upper sample (dynamic ring) in the high-temperature and high-pressure test chamber are connected and fixed through a locking nut, the oil-cooled main shaft and the torque meter are connected to the drive motor through a coupling, the upper part of the high-temperature and high-pressure test chamber is connected to the water-cooled jacket, the lower part of the high-temperature and high-pressure test chamber is connected to the bearing chamber, and the lower part of the bearing chamber and the drive motor are fixed to the test bench bracket at the same time.

[0020] Furthermore, the lifting device is connected to the high-temperature and high-pressure test chamber by a worm gear reducer through a transmission shaft, a sprocket, a support seat, a chain, and a lifting lock. The other side of the chain is connected to the counterweight beam through a guide wheel. At the same time, both sides of the counterweight beam are connected to the linear guide rails to form a lifting and lowering channel.

[0021] Furthermore, an internal water-cooling channel consisting of two elongated holes is provided inside the water-cooled loading shaft, the bottom of which is connected to the spherical end of the spherical universal joint through a thread, and the concave ball end of the spherical universal joint is connected to the lower sample part through the lower sample part fixing chassis.

[0022] Furthermore, the water-cooling jacket is composed of a water-cooling inner cavity and a water-cooling outer cavity, and is sealed by an O-ring. The water-cooling outer cavity is positioned and fixed by a cylindrical head of a hexagon socket screw, and cooling water flows through a water-cooling joint.

[0023] Furthermore, the high-temperature and high-pressure test chamber is fixedly connected by a chamber cover, a chamber body, a chamber chassis, and a winding gasket through studs, hexagonal nuts, and gaskets, and the chamber body has a cooling channel and an electric heater.

[0024] Furthermore, an oil cooling channel is provided inside the oil cooling spindle, and a throttle tooth with a small gap is provided on the outside. At the same time, the oil cooling spindle, the sample loading piece, and the sample loading piece fixing plate are fixed by a locking nut.

[0025] Furthermore, a high-pressure mechanical seal assembly is provided between the bearing cavity and the high-temperature and high-pressure test chamber.

[0026] Furthermore, a baffle ring, a pair of angular contact ball bearings, and multiple sets of lip seals are provided between the bearing cavity and the oil sealing cavity.

[0027] The present invention also provides a gas control system, an oil station system, a high-pressure water station system and a data acquisition and control system.

[0028] Furthermore, the compressed air passes through a set of filtering and pressure reducing devices, proportional pressure regulating valves, and throttling one-way valves and enters both ends of the cylinder piston. The proportional pressure regulating valve is connected to the PLC system to achieve axial load loading adjustment of the sample.

[0029] Furthermore, the oil station system is composed of a filter, an oil pump, a relief valve, a back pressure valve, and a heat exchanger.

[0030] Furthermore, the high-pressure water system is composed of a filter, a high-pressure plunger pump, an accumulator, a relief valve, a pressure transmitter, a temperature transmitter, and a back-pressure valve.

[0031] The beneficial effects of the present invention are:

[0032] 1) This invention provides a disc-on-disc or pin-on-disc rotating friction and wear testing device for high-temperature, high-pressure water environments. This device is capable of testing the rotating sliding friction and wear of friction pairs in such environments. Sensors collect the temperature and pressure of the water within the chamber, as well as the axial load applied to the friction pair. These signals are then regulated by a control system. Sensors also collect data on the friction torque and wear of the friction pair.

[0033] 2) The present invention provides a lifting device with a self-locking function, which adopts a worm gear transmission method to realize a low-speed, self-locking lifting device. At the same time, it is equipped with a counterweight beam installed on a high-precision linear guide rail, making the lifting device more stable and reliable.

[0034] 3) The present invention provides a water-cooled loading shaft and a water-cooled jacket on the top of the high-temperature and high-pressure test chamber, which reduces the impact of the high temperature in the high-temperature and high-pressure test chamber on the size and strength of the loading shaft.

[0035] 4) The present invention provides a spherical universal joint, the contact surface of which is a convex and concave spherical surface fit, the convex spherical surface end is connected to the water-cooled loading rod, and the concave spherical surface end is connected to the lower sample piece. When an axial load is applied, the axial load of the water-cooled loading shaft and the oil-cooled main shaft can be evenly loaded in a non-concentric state, so that the end faces of the upper and lower sample pieces are automatically attached to each other, and the end faces are fully fitted.

[0036] 5) The present invention provides a throttle tooth, which is installed at the bottom of the high-temperature and high-pressure test chamber and on the side of the water-cooled main shaft, and is used to isolate the impact of high-temperature fluid on the performance and strength of the lower high-pressure mechanical seal, thereby improving the safety and reliability of the installation.

[0037] 6) The present invention provides a high-pressure mechanical seal, which is installed on the upper part of the bearing cavity to solve the problem of rotary sealing under high temperature and high pressure working conditions.

[0038] 7) The present invention provides a deflector ring, which is installed at the bottom of the high-pressure mechanical seal. It adopts an overflow structure. When the atmospheric side seal of the high-pressure mechanical seal fails, the deflector ring blocks it and reduces the pressure from the leakage port, which can effectively prevent high-pressure water from directly spraying into the bearing, causing bearing damage and equipment failure.

[0039] 8) The present invention provides an oil-cooled spindle with an internal oil-cooling circulation channel, which cooperates with a lip seal to achieve a rotary sealing function, effectively reducing the operating temperature of the spindle and improving the safety and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is an overall schematic diagram of the present invention.

[0041] Figure 2 It is a three-dimensional diagram of the experimental testing device of the present invention.

[0042] Figure 3 It is a front view of the experimental testing device of the present invention.

[0043] Figure 4 It is a structural diagram of the lifting device of the present invention.

[0044] Figure 5 It is a structural diagram of the water-cooling jacket of the present invention.

[0045] Figure 6 This is a structural diagram of the water-cooled loading shaft of the present invention.

[0046] Figure 7 This is a structural diagram of the high-temperature and high-pressure test chamber of the present invention.

[0047] Figure 8 This is an enlarged view of the throttle tooth.

[0048] Figure 9 This is a structural diagram of the bearing cavity and main shaft of the present invention.

[0049] Description of the accompanying drawings: 1. lifting device, 101. transmission shaft, 102. sprocket, 103. support base, 104. chain, 105. lifting lock, 106. worm gear of reduction device, 107. guide wheel, 108. linear guide rail, 109. counterweight beam;

[0050] 2. Loading cylinder, 3. Tension sensor, 4. Water-cooled loading shaft, 401. Inner water-cooling channel, 402. Spherical universal joint, 5. Water-cooling jacket, 501. Water-cooling joint, 502. Outer sealing ring, 503. Water-cooled outer cavity, 504. Inner sealing ring, 505. Water-cooled inner cavity, 506. Hexagon socket head screw;

[0051] 6. High-temperature and high-pressure test chamber, 601. Spiral wound gasket, 602. Connecting nut, 603. Loading shaft connecting plate, 604. Connecting stud, 605. Cooling channel, 606. Sample loading part, 607. Sample lowering part, 608. Sample lowering part fixing plate, 609. Temperature sensor, 610. Electric heater, 611. Stud, 612. Stud nut, 613. Gasket, 614. Cavity gland, 615. Cavity body, 616. Locking nut, 617. Sample loading part fixing plate, 618. Throttle tooth;

[0052] 7. Bearing cavity, 701. Baffle ring, 702. Lip seal, 703. Angular contact ball bearing, 704. Oil-cooled bearing, 705. Oil seal cavity, 706. High-pressure mechanical seal;

[0053] 8. Support, 9. Coupling, 10. Drive motor, 11. Test bench bracket, 12. Shock-absorbing foot, 13. Torque sensor, 14. Gas control system, 15. Oil station system, 16. High-pressure water station system, 17. Data acquisition and control system. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clearly understood, the technical solutions of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention.

[0055] A high-temperature and high-pressure fluid-lubricated rotating plane friction and wear testing device, which consists of a lifting device and a loading cylinder fixed to the top of a test bench bracket at the same time, the piston rod of the loading cylinder is connected to a tension sensor and a water-cooled loading shaft, the water-cooled loading shaft is connected to a lower sample part (static ring) in a high-temperature and high-pressure test chamber through a spherical universal joint, the oil-cooled main shaft and the upper sample part (dynamic ring) in the high-temperature and high-pressure test chamber are connected and fixed through a locking nut, the oil-cooled main shaft and the torque meter are connected to a drive motor through a coupling, the upper part of the high-temperature and high-pressure test chamber is connected to a water-cooled jacket, the lower part of the high-temperature and high-pressure test chamber is connected to the bearing chamber, and the lower part of the bearing chamber and the drive motor are fixed to the test bench bracket at the same time.

[0056] The lifting mechanism consists of a worm gear reducer connected to the high-temperature and high-pressure test chamber via a drive shaft, sprocket, support base, chain, and lifting lock. The other side of the chain is connected to the counterweight beam via a guide wheel. The counterweight beam is also connected to linear guides on both sides, forming a lifting and lowering channel. The water-cooled loading shaft has two internal water-cooling channels formed by elongated holes. The bottom is threaded to the spherical end of a spherical universal joint. The concave end of the spherical universal joint is connected to the lower specimen via the lower specimen fixing base. The water-cooling jacket consists of an inner water-cooling chamber and an outer water-cooling chamber, which are sealed by a sealing ring. The outer water-cooling chamber is fixed in place by the cylindrical head of a hexagon socket screw. Cooling water flows through the water-cooling joint. The high-temperature and high-pressure test chamber consists of a chamber gland, an inner chamber, a chamber base, and a spiral wound gasket, which are fixed together using studs, hexagonal nuts, and gaskets. The inner chamber contains cooling channels and an electric heater. The oil-cooled spindle is equipped with an internal oil cooling channel and a small-gap throttle tooth on the outside. The oil-cooled spindle, sample loading unit, and sample loading unit mounting plate are secured with locknuts. A high-pressure mechanical seal assembly is installed between the bearing chamber and the high-temperature and high-pressure test chamber. A baffle ring, paired angular contact ball bearings, and multiple lip seals are installed between the bearing chamber and the oil seal cavity.

[0057] Example

[0058] like Figures 1 to 9As shown, the present invention provides a disc-on-disc high-speed rotating friction and wear test apparatus capable of simulating a high-temperature, high-pressure water medium working environment. The apparatus comprises a lifting device 1 and a loading cylinder 2, both of which are fixed to the top of a test bench bracket 11. The piston rod of the loading cylinder 2 is connected to a tension sensor 3 and a water-cooled loading shaft 4. The top of the high-temperature, high-pressure test chamber 6 is connected to a water-cooling jacket 5 and the bottom is connected to a bearing chamber 7. The oil-cooled main shaft 704 is connected to a torque sensor 13 and a drive motor 10 via a coupling 9. The support 8 is fixed to the test bench bracket 11. A shock-absorbing foot 12 is installed at the bottom of the test bench bracket. A gas control system 14 is connected to the loading cylinder 2, an oil station system 15 is connected to the bearing chamber and the oil-cooled main shaft 6, and a high-pressure water station system 16 is connected to the high-temperature, high-pressure test chamber 6. A data acquisition and control system 17 is electrically connected to the tension sensor 3, the temperature sensor 609, the torque sensor 13, the gas control system 14, the oil station system 15, and the high-pressure water station system 16.

[0059] The lifting device 1 in this embodiment includes a worm gear reduction device 106, which is connected to a sprocket 102 fixed to a support seat 103 through a transmission shaft 101, and is connected to the high-temperature and high-pressure test chamber 6 through a chain 104 and a lifting lock 105. The other side of the chain 104 is connected to a counterweight beam 109 through a guide wheel 107. The counterweight beam 109 is raised and lowered and slid on a linear guide rail 108. The linear guide rail 108 is set on the test bench bracket 11, thereby realizing slow, stable and safe lifting and lowering of the high-temperature and high-pressure test chamber 6.

[0060] In this embodiment, the water-cooling jacket 5 includes a water-cooling joint 501 welded to a water-cooled outer chamber 503. The outer chamber 503 and the inner chamber 505 are assembled together to form a water-cooling cavity 507. This cavity 507 is sealed by an outer sealing ring 502 and axially positioned by a hexagon socket head screw 506. The inner side of the inner chamber 505 is sealed from the water-cooled loading shaft 4 by an inner sealing ring 504. The water-cooling joint 501 communicates with the inner water-cooling cavity 507.

[0061] In this embodiment, an internal water-cooling channel 401 is provided in the water-cooling loading shaft 4. The bottom of the water-cooling loading shaft 4 is connected to a spherical universal joint 402. The contact surface thereof is a convex-concave spherical surface, and the convex spherical surface end is connected to the water-cooling loading rod.

[0062] The external chamber of the high-temperature, high-pressure test chamber is secured by a chamber gland 614, a chamber body 615, and a chamber base 619 using studs 611, stud nuts 612, and gaskets 613. The chamber body 615 is secured to both the chamber gland 614 and the chamber base 619 using spiral wound gaskets 601, achieving high-temperature, high-pressure sealing. An electric heater 610 is inserted into the heating hole of the chamber body 615. A temperature sensor 609 is installed within the chamber, in contact with the medium. The chamber body 615 is equipped with cooling channels 605. The sample loading member 606 is secured to the sample loading member fixing plate 617 and locked to the oil-cooled spindle 704 via a locknut 616. A throttle tooth 618 is mounted on the chamber base 619. The oil-cooled spindle is internally provided with an oil-cooling channel and externally provided with a small-gap throttle tooth.

[0063] The concave spherical end of the spherical universal joint 402 is connected to the loading shaft connecting plate 603. The loading shaft connecting plate 603 is connected to the lower sample fixing plate 608 via a connecting stud 604 and a connecting nut 602. The lower sample 607 is fixed to the lower sample fixing plate 608. This allows the end surfaces of the lower sample 607 and the upper sample 606 to self-align when subjected to an axial load. In other words, when an axial load is applied, the axial load can be evenly applied to the water-cooled loading shaft and the oil-cooled main shaft in a non-concentric state, allowing the end surfaces of the upper and lower sample parts to automatically align and achieve full end surface contact.

[0064] The bearing chamber 7 in this embodiment includes a high-pressure mechanical seal 706, a deflector ring 701, a lip seal 702, and a pair of angular contact ball bearings 703. The rotating parts of the pair of angular contact ball bearings 703 are fixed on the oil-cooled main shaft 704, and the bottom is connected to the oil seal chamber 705.

[0065] For friction and wear tests, specifically:

[0066] a. The lifting device 1 works, the worm gear reduction device 106 starts, and the drive shaft 101 drives the sprocket 102 to rotate; the sprocket 102 engages with the chain 104; under the action of the counterweight beam 109 and the guide wheel 107, the cavity body 615 and the cavity gland 614 are lifted;

[0067] b. Loading the sample: The lower sample piece 607 is fixed on the lower sample piece fixing plate 608, and the upper sample piece 606 is locked on the oil-cooled main shaft 704. The concave spherical end of the spherical universal joint 402 is connected to the loading shaft connecting plate 603. The loading shaft connecting plate 603 is connected to the lower sample piece fixing plate 608 through the connecting stud 604 and the connecting nut 602, which can achieve self-adjustment and leveling of the end faces of the lower sample piece 607 and the upper sample piece 606.

[0068] c. After the sample is loaded, the chamber body 615 and the chamber pressure cover 614 are slowly lowered to the chamber bottom plate 619 under the action of the lifting device 1; at the same time, the chamber body 615, the chamber pressure cover 614 and the chamber bottom plate 619 are locked by the stud bolts 611, the stud nuts 612 and the gaskets 613.

[0069] d. The high-pressure water station system 16 provides flushing water for the high-pressure mechanical seal 706 and the cooling channel 605, and provides a water environment simulating the working pressure for the high-temperature and high-pressure test chamber 6. The water in the high-temperature test chamber 6 is heated by the electric heater 610 to simulate the working temperature, and the temperature is controlled by adjusting the flow of the cooling channel 605.

[0070] e. Supply water to the water-cooling jacket 5 and the inner water-cooling channel 401 of the water-cooling recording shaft 4 through the high-pressure water station system 16 to cool the water-cooling recording shaft 4 and reduce the impact of the high temperature and high pressure test chamber on the size and strength of the water-cooled loading shaft 4.

[0071] f. Start the oil station system 15 to supply oil to the oil-cooling flow channel inside the oil-cooled spindle 704, and through the throttle teeth with a small gap installed at the bottom of the high-temperature and high-pressure test chamber, isolate the high-temperature fluid in the high-temperature and high-pressure test chamber from affecting the performance and strength of the lower high-pressure mechanical seal, thereby improving the safety and reliability of the setup.

[0072] g. The oil-cooled spindle 704 obtains the rotation speed by driving the motor 10, so that the test sample obtains the rotation speed; the gas control system 14 is started to control the piston of the loading cylinder 2 to move upward, and the cylinder piston drives the water-cooled loading shaft 4, and then provides an upward axial load to the lower sample 607 through the loading shaft connecting plate 603 and the lower sample fixing plate 608 to ensure that the upper and lower samples fit together; the upper sample 606 and the lower sample 607 are subjected to rotational friction and wear tests under a high-temperature and high-pressure fluid lubrication environment.

[0073] h. During the test, the friction torque of the upper sample 606 and the lower sample 607 is obtained through the torque sensor 13, and the friction coefficient is obtained through calculation. The data acquisition and control system 17 collects the sensor signals of the entire process and regulates the pressure, temperature, speed and load.

[0074] The device can achieve a water temperature range of 20~320℃, and accurately controls the temperature through an electric heater and a cooling water jacket. The temperature fluctuation range does not exceed ±5℃ at high temperatures. The water pressure range is 0~15 MPa, and the control system is precisely adjusted. The pressure fluctuation range does not exceed ±0.3 MPa at high water pressure. The drive motor drives the upper sample to rotate through the main shaft, and the speed range can be obtained from 1 to 10,000 r / min. At high speeds, the speed fluctuation range does not exceed ±1 r / min. The load is applied by the cylinder to drive the loading shaft to lift the lower sample, and the load range can be obtained from 0 to 5,000 N. At high loads, the load fluctuation range does not exceed ±2 N. The spherical universal joint can ensure that the end faces of the upper and lower samples are completely fitted and self-leveled.

[0075] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-temperature and high-pressure fluid-lubricated rotating plane friction and wear testing device, comprising a test bench bracket (11), wherein the high-temperature and high-pressure fluid is a water medium, and characterized in that: The test bench bracket (11) fixes the lifting device (1), the loading cylinder (2), the bearing chamber (7) and the driving motor (10) from top to bottom; the upper part of the high-temperature and high-pressure test chamber (6) in the device is connected to the water-cooling jacket (5), and the lower part of the high-temperature and high-pressure test chamber (6) is connected to the bearing chamber (7); In the lifting device (1), the worm gear reduction device (106) drives the sprocket (102) through the transmission shaft (101), and the sprocket (102) engages with the chain (104); one end of the chain (104) is connected to the high-temperature and high-pressure test chamber (6) through the lifting lock (105), and the other end of the chain (104) is connected to the counterweight beam (109) after passing through the guide wheel (107); the sliders at both ends of the counterweight beam (109) act on the linear guide rail (108) to achieve the lifting and lowering of the high-temperature and high-pressure test chamber (6); The piston rod of the loading cylinder (2) is connected to the tension sensor (3) and the water-cooled loading shaft (4); the water-cooled loading shaft (4) passes through the water-cooled jacket (5) and is inserted into the high-temperature and high-pressure test chamber (6); a spherical universal joint (402) is provided on the end thereof; the driving motor (10) is connected to one end of the oil-cooled main shaft (704) through the coupling (9); the other end of the oil-cooled main shaft (704) passes through the bearing chamber (7) and is provided in the high-temperature and high-pressure test chamber (6); a torque sensor (13) is provided on the coupling (9); In the high-temperature and high-pressure test chamber (6), the chamber cover (614), the chamber body (615), and the chamber bottom plate (619) are surrounded by studs (611) and stud nuts (612) to form an external chamber, and the interior of the external chamber is the test chamber; the sample loading piece (606) in the test chamber is fixed on the sample loading piece fixing plate (617), and the sample loading piece fixing plate (617) is locked on the oil-cooled spindle (704) by a locking nut (616); The lower sample piece (607) is fixed on the lower sample piece fixing plate (608), and the lower sample piece fixing plate (608) is connected to the loading shaft connecting plate (603) through a connecting stud (604) and a connecting nut (602); the loading shaft connecting plate (603) is connected to the spherical universal joint (402), and the end faces of the lower sample piece (607) and the upper sample piece (606) are self-adjusted and leveled when subjected to an axial load.

2. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 1, characterized in that: The contact surface of the spherical universal joint (402) is a convex and concave spherical surface match, the convex spherical surface end is connected to the water-cooled loading shaft (4), and the concave spherical surface end is connected to the lower sample (7). When an axial load is applied, the axial load is evenly loaded on the water-cooled loading shaft (4) and the oil-cooled main shaft (704) in a non-concentric state.

3. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 1, characterized in that: In the water-cooling jacket (5), a water-cooling cavity (507) is provided between the water-cooling outer cavity (503) and the water-cooling inner cavity (505), and the inner ring of the water-cooling inner cavity (505) cooperates with the water-cooling loading shaft (4).

4. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 3, characterized in that: An outer sealing ring (502) is provided between the water-cooled outer cavity (503) and the water-cooled inner cavity (505), and an inner sealing ring (504) is provided between the water-cooled inner cavity (505) and the water-cooled loading shaft (4).

5. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 3, characterized in that: A water-cooling joint (501) is provided on the water-cooling outer cavity (503), and the water-cooling joint (501) is in communication with the water-cooling cavity (507).

6. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 1, characterized in that: An inner water-cooling channel (401) is provided in the water-cooling loading shaft (4).

7. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 1, characterized in that: A wound gasket (601) is provided between the cavity body (615) and the cavity cover (614) and the cavity bottom plate (619), respectively; an electric heater (610) and a temperature sensor (609) are provided on the external cavity; and a cooling channel (605) is provided on the cavity body (615).

8. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 1, characterized in that: The bearing cavity (7) comprises a high-pressure mechanical seal (706), a baffle ring (701), a lip seal (702) and a paired angular contact ball bearing (703). The high-pressure mechanical seal (706) is arranged at the upper portion of the bearing cavity (7), and the baffle ring (701) is arranged at the bottom of the high-pressure mechanical seal (706), adopting an overflow structure. The paired angular contact ball bearing (703) acts on the oil-cooled main shaft (704), and an oil sealing cavity (705) is arranged at the bottom of the paired angular contact ball bearing (703).

9. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 1, characterized in that: An oil-cooling flow channel is provided inside the oil-cooling main shaft (704), and a throttling tooth (618) for isolating high-temperature fluid is provided outside the main shaft.

10. The high-temperature and high-pressure fluid lubricated rotating plane friction and wear testing device according to claim 1, characterized in that: The device is further provided with a gas control system (14), an oil station system (15), a high-pressure water station system (16), and a data acquisition and control system (17). The gas control system (14) is connected to the loading cylinder (2) for controlling the loading cylinder (2); the oil station system (15) is connected to the bearing cavity (7), the high-pressure water station system (16) is connected to the high-temperature and high-pressure test cavity (6), and the data acquisition and control system (17) is electrically connected to the tension sensor (3), the temperature sensor (609), the torque sensor (13), the gas control system (14), the oil station system (15), and the high-pressure water station system (16).

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