Sliding bearing test device

Abstract

The invention discloses a sliding bearing test device, which belongs to the technical field of bearing design test and comprises a bearing test section assembly, a circulation assembly and a medium allocation system. The bearing test section assembly comprises a main shaft, an axial loading assembly and a radial loading assembly, the axial loading assembly and the radial loading assembly are arranged on the main shaft, a mounting support is arranged on the main shaft, the axial loading assembly and the radial loading assembly are arranged on the two sides of the mounting support respectively, and a flow channel is arranged between the radial loading assembly and the axial loading assembly. The medium allocation system communicates with the input end and the output end of the flow channel through the circulation assembly. According to the scheme, seawater is simulated by blending the sediment-containing seawater medium, and the blended sediment-containing seawater medium is introduced into the flow channel in the bearing test section assembly, so that the test bearing in the bearing test section assembly can be immersed in the sediment-containing seawater medium, and the running state of the bearing under the seawater working condition is simulated; and finally, the bearing design is improved by testing the wear condition of the bearing, so that the reliability of the bearing design is improved.

Description

Technical Field

[0001] This invention relates to a testing apparatus, and more specifically, to a sliding bearing testing apparatus. Background Technology

[0002] As a core supporting component of seawater pumps, the service life of sliding bearings directly determines the operational reliability of the pump unit. In seawater containing silt, abrasive wear, corrosive wear, and particle blockage caused by silt particles can lead to abnormal expansion of bearing clearance, surface spalling, and even jamming failure. Especially in nearshore high-silt conditions, bearing life can plummet to less than 30% of that in clear water conditions. Therefore, conducting life tests simulating real-world operating conditions has significant engineering value for bearing material selection, structural optimization, and reliability assessment.

[0003] Current sliding bearing life tests have significant limitations: they generally use clean water or low-concentration suspensions, which cannot simulate the multiphase flow wear characteristics of seawater with high sediment content; existing test benches mostly use constant axial loads, which cannot realize the dynamic axial force that changes with speed during actual pump shaft operation; radial loading can only apply static forces and lacks the ability to reproduce the radial force caused by shaft eccentricity. These defects lead to test results that deviate significantly from actual failure modes, making it difficult to guide the design of high-reliability bearings.

[0004] For example, Chinese Patent Publication No. CN117589450A, published on February 23, 2024, entitled "A Testing Machine for Friction and Wear of Superlubricating Bearings under Simulated Seawater Conditions," discloses a bearing testing device, including a servo motor, a sealed cavity, a specimen sleeve, a force measuring rod, a loading system, and a control, acquisition, and processing system. The drive shaft of the servo motor is connected to a main shaft fixed on the bearing housing. This main shaft is inserted into the sealed cavity and passes through the superlubricating bearing to connect with a center point. A vibration acceleration sensor is provided between the sealed cavity and the bearing housing. The sealed cavity has a heating base plate, a medium inlet pipeline, and a medium outlet pipeline. The medium inlet pipeline is connected to a medium chamber via a medium pump. The lower part of the sealed cavity is filled with lubricating medium, and the upper part is empty. A specimen sleeve and a temperature sensor are provided within the lubricating medium. A specimen sleeve is provided at the connection point between the main shaft and the superlubricating bearing, and this specimen sleeve is connected to the sealed cavity. The force measuring rod is placed in the empty cavity, with its bottom connected to the superlubricating bearing and its top connected to a force measuring sensor I. The loading system is in contact with the surface of the superlubricating bearing. This scheme features high precision and high sensitivity, but it cannot simulate the effects of radial and axial loads on bearings under seawater conditions, making it difficult to provide guidance for bearing design under such conditions. Summary of the Invention

[0005] This invention overcomes the limitation of existing bearing testing devices that cannot simulate wear under load in seawater conditions, and provides a sliding bearing testing device. This solution can simulate the influence of radial and axial loads on bearings under seawater conditions, improving the reliability of bearing design in seawater containing silt.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a sliding bearing testing device, comprising a bearing testing section assembly, a circulation assembly, and a media preparation system; the bearing testing section assembly includes a main shaft and an axial loading assembly and a radial loading assembly mounted on the main shaft, the main shaft being provided with a mounting bracket, the axial loading assembly and the radial loading assembly being respectively disposed on both sides of the mounting bracket, and a flow channel being provided between the radial loading assembly and the axial loading assembly; the media preparation system connects the input end and the output end of the flow channel through the circulation assembly. This solution uses the media preparation system to prepare a sediment-containing seawater medium to simulate seawater, and then introduces the prepared sediment-containing seawater medium into the flow channel in the bearing testing section assembly, allowing the test bearing in the bearing testing section assembly to be immersed in the sediment-containing seawater medium, thereby simulating the bearing's operating state under seawater conditions. Finally, the bearing design is improved by observing the wear of the test bearing, thus enhancing the reliability of the bearing design.

[0007] Preferably, the axial loading assembly includes a mounting bracket sleeved on the outside of the spindle. An electromagnetic coil assembly is mounted on the mounting bracket, and suction cups are spaced apart from the electromagnetic coil assembly on the spindle on the side of the spindle away from the mounting bracket. The electromagnetic coil assembly can generate an attractive force on the suction cups, thereby causing the suction cups to apply an axial load to the spindle, i.e., simulating the axial load on an axial test bearing assembly.

[0008] Preferably, the radial loading assembly includes a loading block sleeved on the end of the spindle, the loading block having an eccentric hole; the loading block is rotatably connected to a first bearing housing via a radial test bearing. The eccentric hole on the loading block allows the loading block to apply a radial load to the spindle, thereby simulating the radial load applied to the radial test bearing.

[0009] Preferably, a connecting seat is provided between the radial loading component and the mounting bracket, and an axial test bearing assembly is provided inside the connecting seat. The mounting bracket and the first bearing housing are respectively fixedly connected to both ends of the connecting seat. The connecting seat is used to connect the mounting bracket and the radial loading component, and forms a flow channel inside the bearing test section assembly.

[0010] Preferably, the axial test bearing assembly includes a second bearing housing and a thrust bearing located within the second bearing housing. The second bearing housing is disposed inside the first bearing housing and the connecting seat and is fixedly connected to the connecting seat. The second bearing housing is used to install the thrust bearing. The flow channel formed by the arrangement of the second bearing housing and the thrust bearing inside the first bearing housing and the connecting seat can ensure that the sediment-laden seawater medium flows through the thrust bearing, thereby realizing medium circulation.

[0011] Preferably, a radial test bearing assembly is also provided between the mounting bracket and the main shaft. The radial test bearing assembly, together with the radial test bearing assembly at the end of the main shaft, provides radial support for the shaft system, while also ensuring the coaxiality of the main shaft, the radial loading assembly, and the radial test bearing, thereby improving the test reliability of the testing device.

[0012] Preferably, the first bearing housing is sealed to the connecting seat, and the connecting seat is sealed to the mounting bracket. The first bearing housing has a water inlet channel at the end furthest from the connecting seat, and the mounting bracket has a water outlet channel inside. The loading block has axially arranged water passage holes. The connection points between the first bearing housing, the connecting seat, and the mounting bracket need to be sealed to prevent the leakage of seawater containing sediment. Simultaneously, the water inlet channel on the first bearing, the internal cavity of the connecting seat, and the water outlet channel inside the mounting bracket together form a flow channel, enabling the flow and circulation of the seawater containing sediment.

[0013] Preferably, the circulation assembly includes a water pipe connecting the media preparation system and the bearing test section assembly, and the water pipe is equipped with a drive pump and a first monitoring system. The drive pump provides power to the sediment-containing seawater media, enabling it to transport water from the media preparation system to the bearing test section assembly, while the first monitoring system can monitor the flow rate, temperature, and other key parameters of the sediment-containing seawater media in real time.

[0014] Preferably, the mounting bracket is equipped with a protective cover, the axial loading assembly is disposed within the protective cover, and the protective cover is equipped with a drive device connected to the spindle. The protective cover protects the axial loading assembly and also provides installation space for the drive device, which can drive the spindle to rotate.

[0015] Preferably, the medium preparation system includes a water tank and a stirring mechanism located inside the water tank, with a heating component installed inside the water tank. The stirring mechanism inside the water tank can uniformly mix the sediment-containing seawater medium, and the heating component can regulate the temperature of the sediment-containing seawater medium to simulate seawater temperature, thereby improving the reliability of the experiment.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) It can simulate the working state of the bearing under radial and axial loads under actual seawater conditions, and has reliable guiding significance for the design of the bearing; (2) The axial load can be adjusted, thereby simulating the variable load generated by different spindle speeds; (3) The scheme is simple, the spindle works stably, and the test results are reliable; (4) The temperature of the silty seawater medium can be adjusted, the sand content of the silty seawater medium can be adjusted, and the silty seawater medium can be stirred and mixed evenly to ensure uniform distribution of silt content. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the bearing test section assembly of the present invention.

[0019] Figure 3 This is a cross-sectional view of the mounting bracket for the present invention.

[0020] Figure 4 for Figure 3 A cross-sectional view along the AA direction.

[0021] Figure 5 This is a top view of the loading block of the present invention.

[0022] Figure 6 for Figure 5 A cross-sectional view along the BB direction.

[0023] Figure 7 This is a schematic diagram of the connecting seat and radial bearing assembly of the present invention.

[0024] Figure 8 This is a schematic diagram of another structural form of the present invention.

[0025] In the diagram: 1. Main shaft, 2. Axial loading assembly, 3. Radial loading assembly, 4. Mounting bracket, 5. Media preparation system, 6. Circulation assembly, 7. Electromagnetic coil assembly, 8. Suction cup, 9. Loading block, 10. Eccentric hole, 11. Radial test bearing, 12. First bearing housing, 13. Connecting seat, 14. Second bearing housing, 15. Axial test bearing, 16. Radial test bearing assembly, 17. Water inlet channel, 18. Water outlet channel, 19. Water passage hole, 20. Water pipe, 21. Drive pump, 22. First monitoring system, 23. Protective cover, 24. 25. Drive unit, 26. Water tank, 27. Stirring mechanism, 28. Heating component, 29. Support component, 30. Bushing, 31. Step, 32. First bearing seat, 33. Groove, 34. Protrusion, 35. Tension sensor, 36. Sealing component, 37. Second monitoring system, 38. Radial test bearing assembly, 39. Axial test bearing assembly, 40. Shoulder, 41. Second bearing seat, 42. Water inlet, 43. Water outlet, 44. Circulation inlet, 45. Circulation outlet, 46. Axial vibration sensor, 47. Radial vibration sensor, 48. Connecting hole. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0027] Example: Figures 1 to 8 The sliding bearing testing apparatus shown includes a bearing test section assembly, a circulation assembly 6, and a media preparation system 5. The bearing test section assembly is used to test the operation of the bearing under conditions of seawater containing sediment. The media preparation system 5 is used to prepare the seawater containing sediment to simulate seawater containing sediment. The circulation assembly 6 can transport the seawater containing sediment from the media preparation system 5 to the bearing test section assembly, and circulate the seawater containing sediment between the media preparation system 5 and the bearing test section assembly. This scheme can simulate the influence of radial and axial loads on the bearing under seawater conditions, improving the reliability of bearing design under conditions of seawater containing sediment.

[0028] Specifically, the bearing test section assembly is arranged on the support assembly 28, which is a frame structure. A through-hole structure is provided in the middle of the platform of the support assembly 28, and the bearing test section assembly is fixed to the through-hole position of the platform of the support assembly 28 by screws. The bearing test section assembly includes a spindle 1, on which an axial loading assembly 2 and a radial loading assembly 3 are arranged. The spindle 1 passes entirely through the through-hole in the support assembly 28. The axial loading assembly 2 is arranged in the upper half of the spindle 1 and located on the upper surface of the platform of the support assembly 28, while the radial loading assembly 3 is arranged in the lower half of the spindle 1 and located below the platform of the support assembly 28.

[0029] Furthermore, the axial loading assembly 2 includes structures such as a mounting bracket 4, an electromagnetic coil assembly 7, and a suction cup 8. The middle part of the mounting bracket 4 is a bushing 29 structure that can be fitted onto the outside of the spindle 1. The bottom of the mounting bracket 4 is a circular support plate structure. A step 30 structure is provided on the upper surface of the support plate of the mounting bracket 4. The electromagnetic coil assembly 7 is installed on the upper surface of the step 30. The electromagnetic coil assembly 7 is also arranged outside the bushing 29 of the spindle 1 and the mounting bracket 4. The electromagnetic coil assembly 7 can generate a magnetic field when energized. Above the electromagnetic coil assembly 7, a suction cup 8 structure is also provided. The suction cup 8 structure can be an iron disc structure. A connecting sleeve structure is provided in the middle of the suction cup 8. The connecting sleeve of the suction cup 8 is fixedly connected to the main shaft 1 by a key. When the main shaft 1 rotates, it will also drive the suction cup 8 to rotate. There is a certain gap between the suction cup 8 and the upper surface of the electromagnetic coil assembly 7. When the electromagnetic coil assembly 7 is energized, it generates a magnetic field and can attract the suction cup 8. Since the suction cup 8 is fixedly connected to the main shaft 1, the suction cup 8 will generate an axial downward force on the main shaft 1. That is, the axial load is applied to the main shaft 1 through the axial loading assembly 2, and the axial load is further transmitted to the axial test bearing 15.

[0030] It should be noted that the overall top view shape of the step 30 on the mounting bracket 4 is quincunx-shaped, meaning that alternating grooves 32 and protrusions 33 are evenly distributed around the circumference of the step 30. A tension sensor 34 is installed within one of the grooves 32. The tension sensor 34 can detect the tension of the electromagnetic coil assembly 7 on the suction cup 8, thereby detecting the applied axial load. The tension sensor 34 is fixedly connected to the electromagnetic coil assembly 7 and the mounting bracket 4. Specifically, the tension sensor 34 is first connected to the lower part of the electromagnetic coil assembly 7 with screws, and then the tension sensor 34 and the electromagnetic coil assembly 7 are fixedly connected to the mounting bracket 4 with screws. A screw hole penetrating the support plate of the mounting bracket 4 is provided on the mounting bracket 4 at the location of the groove 32, thus allowing the tension sensor 34 and the electromagnetic coil assembly 7 to be fixedly arranged on the mounting bracket 4.

[0031] Furthermore, a water outlet channel 18 is provided on one of the protrusions 33 of the step 30 on the mounting bracket 4. One end of the water outlet channel 18 radially connects to the inside of the bushing 29 of the mounting bracket 4, and the other end of the water outlet channel 18 axially penetrates the support plate structure of the mounting bracket 4. That is to say, the water outlet channel 18 is composed of flow channel holes with two perpendicular ends. Among them, a sealing element 35 is provided on a radially arranged section of the water outlet channel 18 outside the protrusion 33. The sealing element 35 can block the radial section of the water outlet channel 18 to prevent the seepage of seawater containing silt from the outer ring of the step 30. The location of the sealing element 35 is the process hole that exists when machining the radial section of the water outlet channel 18, which needs to be blocked by the sealing element 35.

[0032] A protective cover 23 is also provided on the upper surface of the mounting bracket 4. The protective cover 23 is cylindrical, and its radial dimension is larger than that of the axial loading component 2. The axial loading component 2 is arranged inside the protective cover 23. The protective cover 23 is fixedly connected to the support plate structure of the mounting bracket 4 by screws. The protective cover 23 can protect the axial loading component 2 and prevent the external environment from affecting the operation of the axial loading component 2. Furthermore, a drive device 24 is provided on the upper outer surface of the protective cover 23. The top of the protective cover 23 is provided with a through hole structure, so that the output end of the drive device 24 can pass into the interior of the protective cover 23. The drive device 24 is a rotary motor, and its output end is fixedly connected to the spindle 1, thereby driving the spindle 1 to rotate circumferentially. Furthermore, a second monitoring system 36 is provided between the output end of the drive device 24 and the spindle 1. The second monitoring system 36 includes a speed and torque meter, which can monitor the speed and torque of the spindle 1 in real time to ensure that the spindle 1 can rotate normally. The second monitoring system 36 is connected to the drive device 24 and the main shaft 1 via a coupling.

[0033] Furthermore, a connecting seat 13 and a radial loading component 3 are provided below the mounting bracket 4. The connecting seat 13 is a stepped cylindrical structure. The radial dimension of the upper half of the connecting seat 13 is smaller than that of the lower half. Rib plates are evenly arranged on the upper half of the connecting seat 13 and on its outer periphery to ensure the overall structural strength of the connecting seat 13. The upper half of the connecting seat 13 is fixedly connected to the lower surface of the support plate of the mounting bracket 4 by screws.

[0034] The lower half of the connecting seat 13 is provided with a flange connecting seat and is connected to the radial loading assembly 3. Specifically, the radial loading assembly 3 includes a first bearing seat 12 and a loading block 9, the upper end of the first bearing seat 12 ( Figure 2 (As shown in the diagram) The flange connecting seat 13 is bolted to the lower half of the connecting seat 13, meaning that the first bearing seat 12 and the connecting seat 13 are fixedly connected by a flange. Inside the first bearing seat 12, there is a cavity to accommodate the loading block 9. A connecting hole 47 is provided in the middle of the loading block 9. The loading block 9 is fixedly connected to the end of the main shaft 1 through the keyway and key on the connecting hole 47, allowing the loading block 9 to rotate with the rotation of the main shaft 1.

[0035] Furthermore, a test bearing assembly is provided inside the cavity formed by the connecting seat 13 and the first bearing seat 12. The test bearing assembly includes a radial test bearing assembly 37 and an axial test bearing assembly 38. The radial test bearing assembly 37 is the object that bears radial loads, and the axial test bearing assembly 38 is the object that bears axial loads. The radial test bearing assembly 37 includes a radial test bearing 11, which is a radial sliding bearing. The axial test bearing assembly 38 includes an axial test bearing 15 and a second bearing seat 14. The axial test bearing 15 is a thrust sliding bearing.

[0036] Specifically, the first bearing housing 12 and the loading block 9 are arranged coaxially, and a radial test bearing 11 is provided on the outer periphery of the loading block 9 and inside the first bearing housing 12. Specifically, as shown... Figure 6 As shown, a shoulder 39 is provided on the outer periphery of the loading block 9, away from the connecting seat 13. This shoulder 39 is used to install the bushing of the radial test bearing 11 and also serves to axially limit the radial test bearing 11. A stepped countersunk hole is also provided in the first bearing seat 12 for installing the bearing shell of the radial test bearing 11. The installation of the radial test bearing 11 is completed by the first bearing seat 12 and the loading block 9 together. In addition, since the radial test bearing 11 is arranged between the loading block 9 and the first bearing seat 12, the loading block 9 can rotate relative to the first bearing seat 12 with the main shaft 1.

[0037] Understandably, to ensure the normal rotation of the spindle 1, a radial test bearing assembly 16 is also provided on the spindle 1. The two sets of bearings, radial test bearing assembly 16 and radial test bearing assembly 37, ensure the coaxiality of the spindle 1's rotation, preventing uneven radial load on the spindle 1 and potential jamming. The radial test bearing assembly 37 includes a radial test bearing, which, like the radial test bearing 11, is a radial sliding bearing. Specifically, the radial test bearing is arranged in the central through hole of the mounting bracket 4, and the bearing bush of the radial test bearing is installed in the central through hole of the mounting bracket 4. The spindle 1 passes through the central through hole of the mounting bracket 4, and the bushing of the radial test bearing is installed on the outer circumference of the spindle 1, thus forming a relative rotational connection between the spindle 1 and the mounting bracket 4. The radial test bearing assembly 37 and the radial test bearing assembly 16 enable the spindle 1 to rotate more smoothly.

[0038] Furthermore, an eccentric hole 10 structure is arranged on the loading block 9. The loading block 9 is a cylindrical structure with an eccentric hole 10 structure arranged axially on it. The eccentric hole 10 is asymmetrically arranged on the loading block 9. When the loading block 9 rotates with the spindle 1, the centrifugal force generated by the loading block 9 will be uneven, thus causing the loading block 9 to apply a radial load to the spindle 1, and also to the radial test bearing 11 on the outer periphery of the loading block 9. In addition, the eccentric hole 10 can be a through hole structure that penetrates the axial direction of the loading block 9, or a slot structure that does not penetrate the axial direction of the loading block 9. The cross-sectional shape of the eccentric hole 10 can be circular, square, or other shapes.

[0039] Furthermore, within the cavity formed inside the connecting seat 13 and the first bearing seat 12, an axial test bearing assembly 38 is also provided on the main shaft 1. The axial test bearing assembly 38 includes a second bearing seat 14 and a thrust sliding bearing (axial test bearing 15). The second bearing seat 14 includes a first bearing seat 31 and a second bearing seat 40. Both the first bearing seat 31 and the second bearing seat 40 are sleeved on the outside of the main shaft 1, with the first bearing seat 31 located above the second bearing seat 40. Figure 2 (As shown in the diagram), the first bearing seat 31 is located in the cavity inside the connecting seat 13 and is fixedly connected to the main shaft 1 by a shoulder and a key on the main shaft 1. When the main shaft 1 rotates, it will drive the first bearing seat 31 to rotate. The second bearing seat 40 is located in the cavity of the first bearing seat 12 and is fixedly connected to the lower part of the connecting seat 13 by screws, and is fixed as a whole with the connecting seat 13. The axial test bearing 15 (thrust sliding bearing) is arranged between the first bearing seat 31 and the second bearing seat 40. When the axial loading assembly 2 applies an axial load to the main shaft 1, the shoulder on the main shaft 1 will apply an axial downward force to the first bearing seat 31, while the position of the second bearing seat 40 will not change, so the first bearing seat 31 will apply an axial load to the thrust sliding bearing.

[0040] It should also be noted that an axial vibration sensor 45 is provided on the connecting seat 13. The axial vibration sensor 45 is arranged on the stepped surfaces of the upper and lower halves of the connecting seat 13. The axial vibration sensor 45 extends into the connecting seat 13 and is arranged vertically on the upper surface of the first bearing seat 31. When the axial test bearing assembly 38 is subjected to axial load, a small axial displacement can be detected by the axial vibration sensor 45. A radial vibration sensor 46 is arranged radially on the first bearing seat 12. The position of the radial vibration sensor 46 corresponds to the position of the loading block 9. The radial vibration sensor 46 extends into the first bearing seat 12 and extends to the radial surface of the loading block 9. When the radial test bearing assembly 37 is subjected to radial force and a small radial displacement occurs, it can be detected by the radial vibration sensor 46.

[0041] The axial load application process for this scheme is as follows.

[0042] When the spindle 1 is working, the electromagnetic coil assembly 7 is energized, generating a magnetic field that attracts the chuck 8 downwards. Since the chuck 8 is fixed to the spindle 1, it also exerts a downward force on the spindle 1. For the axial test bearing assembly 38, the second bearing seat 40 is axially positioned against the shoulder on the spindle 1, thus transmitting the axial force generated on the spindle 1 to the second bearing seat 40. The first bearing seat 31 is fixed below the connecting seat 13, and the axial test bearing 15 is positioned between the second bearing seat 40 and the first bearing seat 31. The second bearing seat 40 then applies the axial load to the axial test bearing 15. In other words, the axial test bearing 15 bears the axial load during normal operation.

[0043] Furthermore, by adjusting the current in the electromagnetic coil assembly 7, the magnetic field strength can be changed, thereby changing the axial load applied to the axial test bearing 15. Variable load tests can be performed, which can simulate the dynamic axial force that changes with the rotational speed during actual pump shaft operation.

[0044] The radial load application process for this scheme is as follows.

[0045] The drive unit is activated, causing the spindle 1 to rotate. Since the loading block 9 is fixedly arranged on the spindle 1, it also rotates circumferentially along with the spindle 1. The rotation of the loading block 9 generates centrifugal force. Due to the asymmetrically arranged eccentric holes 10 on the loading block 9, it generates a non-uniformly distributed centrifugal force, meaning the loading block 9 exerts a radial force on the spindle 1. The radial test bearing assembly 37 is arranged on the outer periphery of the loading block 9, and the loading block 9 also exerts a radial load on the radial test bearing assembly 37. In other words, the radial test bearing 11 bears a radial load during normal operation.

[0046] Furthermore, the media preparation system 5 includes a water tank 25 and a stirring mechanism 26. The water tank 25 has a rectangular box structure and contains a seawater medium containing silt and sand to simulate seawater under actual working conditions. The stirring mechanism 26 includes a rotary motor located on the upper surface of the water tank 25. The upper surface of the water tank 25 is provided with a through-hole structure so that the output end of the rotary motor can be located inside the water tank 25. A stirring shaft is provided at the output end of the rotary motor. The stirring shaft is located inside the water tank 25 and is immersed in the seawater medium containing silt and sand. A stirring blade is provided on the stirring shaft. When the rotary motor is started, the rotary motor drives the stirring shaft to rotate. The stirring blade can fully stir the seawater medium containing silt and sand in the water tank 25, so that the impurities inside the seawater medium containing silt and sand can be evenly distributed.

[0047] Furthermore, a heating component 27 is installed inside the water tank 25. The heating component 27 is an electric heating appliance that can heat the muddy seawater medium inside the water tank 25. The temperature of the muddy seawater medium can be controlled by the heating component 27 to simulate the seawater temperature and improve the reliability of the experiment.

[0048] A water inlet 41 is provided on the upper side of the water tank 25, through which water can be added to the water tank 25 to adjust the sediment content. A drain outlet 42 is provided on the lower side of the water tank 25, which is connected to a drainage ditch to discharge the water after the test. The water inlet 41 and the drain outlet 42 on the water tank 25 are located on the same side of the water tank 25.

[0049] On the opposite side of the water tank 25 where the water inlet 41 and the outlet 42 are arranged, there are a circulation inlet 43 and a circulation outlet 44. The circulation inlet 43 and the circulation outlet 44 of the water tank 25 are connected to the bearing test section assembly through the circulation assembly 6.

[0050] Specifically, the circulation component 6 includes water pipes 20 connected to the water tank 25 and the bearing test section component. Specifically, a water inlet channel 17 is provided at the bottom of the first bearing seat 12 on the bearing test section component, and a water outlet channel 18 is provided on the mounting bracket 4. Two water pipes 20 are provided in total. One water pipe connects the circulation outlet 44 on the water tank 25 and the water inlet channel 17 on the first bearing seat 31, and the other water pipe 20 connects the circulation inlet 43 on the water tank 25 and the water outlet channel 18 on the mounting bracket 4. Inside the bearing test section component, a flow channel for circulating the sediment-laden seawater medium is provided. One of the two water pipes 20 is equipped with a drive pump 21, used to drive the sediment-laden seawater medium in the water tank 25 into the bearing test section component. Simultaneously, a first monitoring system 22 is also provided on the water pipe 20, which can monitor the flow rate, temperature, and other key parameters of the sediment-laden seawater medium in real time.

[0051] The main flow paths of seawater containing silt are as follows.

[0052] The sediment-laden seawater medium, which has been uniformly stirred in the water tank 25, exits from the circulation outlet 44 of the water tank 25 and enters the water inlet channel 17 at the bottom of the first bearing housing 12 through the water pipe 20. The sediment-laden seawater medium enters the inner cavity of the first bearing housing 12 through the water inlet channel 17, and then submerges the loading block 9 and the radial test bearing 11 inside the first bearing housing 12. There is a gap between the bushing and the bearing shell of the radial test bearing 11, through which the sediment-laden seawater medium can pass. In addition, multiple sets of water passage holes 19 are evenly distributed in a ring on the loading block 9. The water passage holes 19 are through holes that axially penetrate the loading block 9, and the sediment-laden seawater medium can also pass through the water passage holes 19. Then, the sediment-laden seawater medium exits from the location of the loading block 9 and the radial test bearing 11. The medium is placed in the axial test bearing assembly 38, wherein a gap is provided between the second bearing seat 40 and the main shaft 1, so that the medium containing sediment and seawater can enter the axial test bearing 15 through the gap between the second bearing seat 40 and the main shaft 1, and enter the inner cavity of the connecting seat 13 through the gap between the bearing shell and the mirror plate of the axial test bearing. Then, the medium containing sediment and seawater is immersed in the radial test bearing assembly 16 on the mounting bracket 4 and the main shaft 1 through the inner cavity of the connecting seat 13, and then enters the water outlet channel 18 in the mounting bracket 4 through the gap of the radial test bearing. Finally, it returns from the water outlet channel 18 to the circulation inlet 43 of the water tank 25 through the water pipe 20, thereby completing the circulation of the medium containing sediment and seawater.

Claims

1. A sliding bearing testing apparatus, characterized in that, include The bearing test section assembly includes a main shaft and an axial loading assembly and a radial loading assembly mounted on the main shaft. The main shaft is provided with a mounting bracket. The axial loading assembly and the radial loading assembly are respectively located on both sides of the mounting bracket. A flow channel is provided between the radial loading assembly and the axial loading assembly. The media preparation system connects the input and output ends of the flow channel through a circulation component.

2. The sliding bearing testing device according to claim 1, characterized in that, The axial loading assembly includes a mounting bracket sleeved on the outside of the spindle. An electromagnetic coil assembly is provided on the mounting bracket, and suction cups are provided on the spindle on the side of the electromagnetic coil assembly away from the mounting bracket, spaced apart from the electromagnetic coil assembly.

3. The sliding bearing testing device according to claim 1, characterized in that, The radial loading assembly includes a loading block sleeved on the end of the spindle, and the loading block is provided with an eccentric hole; the loading block is rotatably connected to the first bearing seat through a radial test bearing.

4. The sliding bearing testing device according to claim 3, characterized in that, A connecting seat is provided between the radial loading component and the mounting bracket. An axial test bearing assembly is provided inside the connecting seat. The mounting bracket and the first bearing seat are respectively fixedly connected to both ends of the connecting seat.

5. The sliding bearing testing device according to claim 4, characterized in that, The axial test bearing assembly includes a second bearing housing and a thrust bearing located within the second bearing housing. The second bearing housing is disposed inside the first bearing housing and the connecting seat and is fixedly connected to the connecting seat.

6. A sliding bearing testing apparatus according to any one of claims 3 to 5, characterized in that, A radial test bearing assembly is also provided between the mounting bracket and the main shaft.

7. A sliding bearing testing apparatus according to claim 4 or 5, characterized in that, The first bearing housing is sealed to the connecting seat, the connecting seat is sealed to the mounting bracket, the first bearing housing is provided with a water inlet channel at the end away from the connecting seat, the mounting bracket is provided with a water outlet channel inside, and the loading block is provided with an axially arranged water passage hole.

8. The sliding bearing testing apparatus according to claim 7, characterized in that, The circulation assembly includes a water pipe connecting the medium preparation system and the bearing test section assembly, and the water pipe is equipped with a drive pump and a first monitoring system.

9. A sliding bearing testing apparatus according to any one of claims 1 to 5, characterized in that, The mounting bracket is equipped with a protective cover, the axial loading component is located inside the protective cover, and the protective cover is equipped with a drive device connected to the spindle.

10. A sliding bearing testing apparatus according to any one of claims 1 to 5, characterized in that, The medium preparation system includes a water tank and a stirring mechanism located inside the water tank, and a heating component is provided inside the water tank.

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