Device and method for measuring oil film pressure and thickness on sliding bearing surface

Abstract

This invention discloses a device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush, comprising a chassis, a measuring device fixed on the upper surface of the chassis, support frames fixed on both sides of the measuring device on the chassis, a driving device fixed between the tops of the two support frames, a moving device fixed on each opposite side of the two support frames, and a loading device fixed between the two moving devices. A ball screw is mounted on one of the support frames, with one end of the ball screw hinged to the driving device, and a screw nut mounted on the ball screw, which is fixedly connected to the corresponding moving device. The device also includes a fixed shaft, one end of which is hinged to the driving device and passes through the loading device; a thrust device fixedly connected to the loading device is sleeved on the other end of the fixed shaft. This invention also discloses a method for measuring the oil film pressure and thickness on the surface of a sliding bearing bush. This invention can simultaneously measure oil film pressure and oil film thickness, and can also calibrate the oil film state and electrical signals, achieving timely feedback of measurement data.

Description

Technical Field

[0001] This invention belongs to the technical field of oil film measuring devices, and relates to a device for measuring the oil film pressure and thickness on the surface of a sliding bearing. This invention also relates to a method for measuring the oil film pressure and thickness on the surface of a sliding bearing. Background Technology

[0002] Sliding bearing shells are a key component of sliding bearings, serving to support and fix the load, and reducing friction and wear during operation. Compared to traditional rolling bearings, sliding bearings rely on smooth surfaces to support the load and typically require lubricants to reduce direct contact. They are widely used in automotive, railway, aerospace, and machinery manufacturing. As a critical component of sliding bearings, the performance of the sliding bearing shell directly affects the overall performance of the sliding bearing. With the rapid advancement of industrial machinery, the speed and load of machines have increased accordingly, and high-speed, heavy-load conditions are now common, placing higher demands on the performance of sliding bearing shells.

[0003] Factors affecting the efficiency of sliding bearings include materials, structure, and lubricants. Among these, the pressure and thickness of the lubricant film are crucial factors affecting the efficiency and lifespan of sliding bearings. Specialized measuring devices are needed to measure the pressure and thickness of the oil film. Traditional measuring devices cannot simulate the operating conditions of sliding bearings when measuring the oil film thickness and pressure, have poor measurement accuracy, and cannot provide timely feedback of measurement data. Therefore, it is urgent to develop a new measuring device to solve this technical problem. Summary of the Invention

[0004] The purpose of this invention is to provide a device for measuring the oil film pressure and thickness on the surface of a sliding bearing, which can simulate the operating state of the sliding bearing and measure the data in real time when measuring the oil film thickness and pressure of the sliding bearing.

[0005] The first technical solution adopted in this invention is a sliding bearing surface oil film pressure and thickness measuring device, including a chassis, a measuring device fixed on the upper surface of the chassis, support frames fixed on both sides of the measuring device on the chassis, a driving device fixed between the tops of the two support frames, a moving device fixed on one side of each of the two support frames, a loading device fixed between the two moving devices, a ball screw provided on one of the support frames with one end of the ball screw hinged to the driving device, a screw nut provided on the ball screw, and the screw nut fixed to the corresponding moving device; it also includes a fixed shaft, one end of the fixed shaft hinged to the driving device and passing through the loading device, and a thrust device fixed to the loading device sleeved on the other end of the fixed shaft.

[0006] The first technical solution of this invention is also characterized by:

[0007] A first groove, 1mm-3mm deep, is formed on the chassis between two support frames. A positioning pin hole is formed at the bottom of the first groove. The measuring device includes a base, which is adapted to the shape and size of the first groove. The bottom of the base is fixed in the first groove, and the rest of the base is located outside the first groove. Several second grooves are formed on the upper surface of the base. A first gasket is fixed at the bottom of the second groove. The measuring device also includes a housing. Several piezoelectric sensors are fixed at the bottom of the housing, and the number of piezoelectric sensors is the same as the number of second grooves. A first sleeve adapted to the shape and size of the second groove is fitted on the piezoelectric sensor. The piezoelectric sensors are fixed one by one in the second groove, and the bottom of the first sleeve and the bottom of the piezoelectric sensor are both fixed on the first gasket. An oil inlet is formed on one side of the housing, and an oil outlet is formed on the other side of the housing. A third groove is formed on the surface of the housing, and several fourth grooves are formed at the bottom of the third groove. A heating ring is set in the fourth groove.

[0008] The drive unit includes a top plate, the bottom of which is fixed between the tops of two support frames. A mounting plate is fixed on the top surface of the top plate, and the mounting plate is located directly above the ball screw. A stepper motor is fixed on the mounting plate, and the stepper motor is equipped with an up button, a stop button, and a down button. A bearing seat is fixed on the side of the support frame where the ball screw is located, and one end of the ball screw is hinged to the bearing seat. The other end of the ball screw passes through the top plate and the mounting plate and is hinged to the stepper motor. The up button, stop button, and down button are electrically connected to the ball screw. A servo motor is fixed on the top surface of the top plate, directly above the fixed shaft. One end of the splined shaft is hinged to the bottom of the servo motor, and the other end of the splined shaft passes through the top plate. A splined groove is opened at one end of the fixed shaft, and the splined shaft is fixed in the splined groove. The splined groove is 30mm-40mm deep.

[0009] Several pads are fixed between the support frame and the chassis. A grating ruler is set on one side of one of the support frames in a direction perpendicular to the chassis. Several first through holes are opened on the support frame except for the moving device, the grating ruler, the bearing seat, and the ball screw.

[0010] The moving device includes two guide rails. Each of the support frames on both sides of the ball screw has a guide rail fixed on it and the guide rail is parallel to the ball screw. A slider is sleeved on the guide rail. The two sliders are fixed to one side of the moving plate. The screw nut is fixed to the corresponding moving plate. The loading device is fixed between the two moving plates.

[0011] The loading device includes a support plate, which is fixed between two movable plates and parallel to the top plate. A fifth groove, 1mm-3mm deep, is formed on the surface of the support plate near the top plate. A fixed shaft passes through the support plate through the fifth groove. A double-direction thrust ball bearing is sleeved around the fixed shaft inside the fifth groove. The double-direction thrust ball bearing includes a first seat ring, a first steel ball assembly, a shaft ring, a second seat ring, and a second steel ball assembly, which are fixed together in sequence. The bottom of the first seat ring is fixed in the fifth groove, while the remaining parts of the first seat ring, the first steel ball assembly, the shaft ring, the second seat ring, and the second steel ball assembly are all located outside the fifth groove. The bearing has a double-acting thrust ball bearing with a bushing sleeve on the outside and the bottom of the bushing sleeve fixed to the support plate. The fixed shaft is a two-stage stepped shaft structure. The end of the fixed shaft with a spline groove is located on the outer stepped shaft. The shaft ring is snapped onto the inner stepped shaft of the fixed shaft. The inner diameter of the second seat ring and the inner diameter of the second steel ball assembly are both adapted to the diameter of the outer stepped shaft of the fixed shaft. The inner stepped shaft of the fixed shaft is fitted with a second sleeve, and one end of the second sleeve is fixed to the shaft ring. The first seat ring and the first steel ball assembly are both snapped onto the second sleeve. The thrust device is fitted onto one end of the inner stepped shaft of the fixed shaft and is fixedly connected to the other end of the second sleeve.

[0012] The thrust device includes a thrust plate, the shape of which is adapted to the third groove and the size of the thrust plate is not larger than the third groove. A sixth groove is formed on one side of the thrust plate. A second through hole perpendicular to the bottom of the sixth groove is formed on the thrust plate from the bottom of the sixth groove and the diameter of the second through hole is adapted to the diameter of the inner stepped shaft of the fixed shaft. A second washer is fixed on the bottom of the sixth groove by several screws and the second washer covers the second through hole. One end of the inner stepped shaft of the fixed shaft extends into the thrust plate from the second through hole. The distance from the top of the shaft ring to the top of the shaft sleeve is not greater than the distance from the top surface of the second washer to the top of the thrust plate.

[0013] The second technical solution adopted in this invention is a method for measuring the oil film pressure and thickness on the surface of a sliding bearing, comprising the following steps:

[0014] Step 1: Start the stepper motor to move the lead screw nut upward, which in turn drives the moving device, loading device and thrust device to move upward in sequence. Place several sliding bearings at equal intervals at the bottom of the third groove. A number of waveguides are attached to the surface of each sliding bearing. The surface of the sliding bearings and all waveguides are coated with Babbitt alloy.

[0015] Step 2: Connect the heating ring to the power supply and heat the third groove. Start the stepper motor to move the thrust device down. At the same time, start the servo motor to make the fixed shaft drive the thrust disk to rotate. Adjust the position of the thrust device as it moves down. Collect guided wave signals of oil film pressure and oil film thickness through the piezoelectric sensor.

[0016] The second technical solution of the present invention is further characterized by:

[0017] In step 1, the lead screw nut is moved upward by pressing the up button, which in turn moves one moving plate upward. The moving plate transmits force to the support plate, which in turn moves the other moving plate upward. The force is then transmitted sequentially to the bushing and the bidirectional thrust ball bearing, which in turn moves the second sleeve and the thrust plate upward. The thickness of the waveguide plate is 1mm-3mm.

[0018] Step 2 is performed as follows:

[0019] Step 2.1: Connect the heating ring to the power supply and control the temperature inside the third groove to between room temperature and 80°C;

[0020] Step 2.2: Move the lead screw nut down by pressing the down button, thereby moving one moving plate down. The moving plate transmits force to the support plate, which in turn moves the other moving plate down. The force is then transmitted to the bushing and the double-direction thrust ball bearing in sequence, which in turn moves the second sleeve and the thrust plate down. At the same time, the servo motor is started to make the fixed shaft rotate the thrust plate.

[0021] Step 2.3: Guided wave signals of oil film pressure and oil film thickness are acquired using a piezoelectric sensor. After each acquisition, the position of the thrust device is adjusted to keep the oil film pressure acquired by the piezoelectric sensor between 1MPa and 20MPa and the oil film thickness between 10μm and 200μm. Each time the thrust device is adjusted, the oil film pressure acquired by the piezoelectric sensor is changed by 1MPa to 2MPa and the oil film thickness is changed by 10μm to 20μm. The guided wave signals are decoupled using a convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the sliding bearing surface and the waveform change of the guided wave signal, as well as the relationship between the oil film thickness on the sliding bearing surface and the waveform change of the guided wave signal. The pressure distribution and oil film thickness at any point on the sliding bearing surface are obtained, and the measurement is completed.

[0022] The beneficial effects of this invention are:

[0023] This invention relates to a compact and simple-to-use device for measuring the oil film pressure and thickness on the surface of a sliding bearing. It can measure both oil film pressure and thickness. Furthermore, the inclusion of a piezoelectric sensor allows for calibration of the oil film state and electrical signals, facilitating subsequent measurements. A fixed shaft drives the thrust disk to rotate, simulating the operating state of the sliding bearing during measurement. The method for measuring the oil film pressure and thickness involves adjusting the downward position of the thrust disk to change the oil film pressure and thickness. The piezoelectric sensor collects guided wave signals, which are decoupled using a convolutional neural network in deep learning. This allows for the determination of the relationship between the pressure distribution on the sliding bearing surface and the waveform changes of the guided wave signal, as well as the relationship between the oil film thickness and the waveform changes of the guided wave signal. This enables the acquisition of the pressure distribution and oil film thickness at any point on the sliding bearing surface, achieving accurate measurement of the oil film pressure and thickness and timely feedback of the measurement data. Attached Figure Description

[0024] Figure 1 This is an overall structural diagram of the present invention;

[0025] Figure 2 This is a cross-sectional view of the measuring device in this invention;

[0026] Figure 3 This is a longitudinal cross-sectional view of the measuring device in this invention;

[0027] Figure 4 This is a cross-sectional view of the servo motor and its connection parts in this invention;

[0028] Figure 5 This is a cross-sectional view of the spline shaft and spline groove in this invention;

[0029] Figure 6 This is a structural diagram of the lead screw and its connecting parts in this invention;

[0030] Figure 7 This is a cross-sectional view of the loading device in this invention.

[0031] In the diagram, 1. Support frame, 2. Mounting plate, 3. Stepper motor, 4. Servo motor, 5. Guide rail, 6. Slider, 7. Ball screw, 8. Screw nut, 9. Bearing seat, 10. Grating ruler, 11. Moving plate, 12. Bidirectional thrust ball bearing, 13. Bushing, 14. Fixed shaft, 15. Support plate, 16. Second sleeve, 17. Housing, 18. Heating ring, 19. Thrust plate, 20. Waveguide plate, 21. Pad, 22. Second pad, 23. Piezoelectric sensor, 24. Base, 25. Chassis, 26. Sliding bearing, 27. First sleeve, 28. First pad, 29. Top plate, 30. Screw, 31. 32. Babbitt metal coating, 33. Positioning shaft hole, 34. Fifth groove, 35. Thrust device, 36. Moving device, 37. First groove, 38. Oil inlet, 39. Oil outlet, 40. Upward button, 41. Stop button, 42. Downward button, 43. Loading device, 44. Splined shaft, 45. Spline groove, 46. First through hole, 47. Drive device, 48. First seat ring, 49. First steel ball assembly, 50. Shaft ring, 51. Second seat ring, 52. Second steel ball assembly, 53. Sixth groove, 54. Third groove, 55. Fourth groove, 56. Second groove, 57. Measuring device, 58. Second through hole. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] The device for measuring the oil film pressure and thickness on the surface of the sliding bearing bush is referenced. Figure 1The system includes a chassis 25, with a measuring device 56 fixed to its upper surface. Support frames 1 are fixed to both sides of the measuring device 56 on the chassis 25. A drive device 46 is fixed between the tops of the two support frames 1. Moving devices 35 are fixed to opposite sides of the two support frames 1. A loading device 42 is fixed between the two moving devices 35. A ball screw 7 is mounted on one support frame 1, with one end of the ball screw 7 hinged to the drive device 46. A screw nut 8 is mounted on the ball screw 7 and fixed to the corresponding moving device 35. The system also includes a fixed shaft 14, with one end hinged to the drive device 46 and passing through the loading device 42. A thrust device 34, fixed to the loading device 42, is sleeved on the other end of the fixed shaft 14. A first groove 36, 1mm-3mm deep, is formed on the chassis 25 between the two support frames 1. Figure 2 The bottom of the first groove 36 has a positioning pin hole 32; refer to Figure 3 The measuring device 56 includes a base 24, which is adapted to the shape and size of the first groove 36. The bottom of the base 24 is fixed in the first groove 36, and the rest of the base 24 is located outside the first groove 36. The positioning pin hole 32 facilitates the positioning of the base 24 and prevents it from moving. Several second grooves 55 are formed on the upper surface of the base 24. A first pad 28 is fixed at the bottom of the second groove 55 to change the distance between the piezoelectric sensor 23 and the chassis 25 during measurement. The measuring device 56 also includes a housing 17. Several piezoelectric sensors 23 are fixed at the bottom of the housing 17, and the number of piezoelectric sensors 23 is the same as the number of second grooves 55. Sensor 23 is used to collect guided wave signals; a first sleeve 27 adapted to the shape and size of the second groove 55 is fitted on the piezoelectric sensor 23. The piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are both fixed on the first gasket 28. An oil inlet 37 is opened on one side of the housing 17, and an oil outlet 38 is opened on the other side of the housing 17. A third groove 53 is opened on the surface of the housing 17. Several fourth grooves 54 are opened at the bottom of the third groove 53. A heating ring 18 is provided in the fourth groove 54. The heating ring 18 can control the temperature in the fourth groove 54 from room temperature to 80°C.

[0034] Reference Figure 1The drive device 46 includes a top plate 29, the bottom surface of which is fixed between the tops of two support frames 1. A mounting plate 2 is fixed on the top surface of the top plate 29 and is located directly above the ball screw 7. A stepper motor 3 is fixed on the mounting plate 2. The stepper motor 3 is equipped with an up button 39, a stop button 40, and a down button 41. A bearing seat 9 is fixed on the side of the support frame 1 where the ball screw 7 is located, and one end of the ball screw 7 is hinged to the bearing seat 9. The other end of the ball screw 7 passes through the top plate 29 and the mounting plate 2 and is hinged to the stepper motor 3. The up button 39, the stop button 40, and the down button 41 are electrically connected to the ball screw 7. A servo motor 4 is fixed on the top surface of the top plate 29 at a position directly above the fixed shaft 14. Figure 4 The bottom of the servo motor 4 is hinged to one end of a splined shaft 43, and the other end of the splined shaft 43 passes through the top plate 29, as shown in the reference. Figure 5 A spline groove 44 is provided at one end of the fixed shaft 14 and the spline shaft 43 is fixed in the spline groove 44. The spline groove 44 has a depth of 30mm-40mm. The servo motor 4 is used to drive the fixed shaft 14 to rotate.

[0035] Reference Figure 1 Several pads 21 are fixed between the support frame 1 and the chassis 25. A grating ruler 10 is provided on one side of the support frame 1 in a direction perpendicular to the chassis 25. The grating ruler 10 can record the distance moved by the moving device 35 in real time. Several first through holes 45 are opened on the support frame 1 in positions other than the moving device 35, the grating ruler 10, the bearing seat 9, and the ball screw 7. The first through holes 45 can reduce the weight of the support frame 1, thereby reducing the pressure on the chassis 25.

[0036] Reference Figure 6 The moving device 35 includes two guide rails 5. A guide rail 5 is fixed to each of the support frames 1 on both sides of the ball screw 7, and the guide rails 5 are parallel to the ball screw 7. A slider 6 is sleeved on each guide rail 5. (Refer to...) Figure 1 Two sliders 6 are fixed together on one side of the movable plate 11, the lead screw nut 8 is fixed to the corresponding movable plate 11, and the loading device 42 is fixed between the two movable plates 11.

[0037] The loading device 42 includes a support plate 15, which is fixed between two movable plates 11 and parallel to the top plate 29. A fifth groove 33 is formed on the surface of the support plate 15 near the top plate 29. The groove 33 has a depth of 1mm-3mm. A fixed shaft 14 passes through the support plate 15 from the fifth groove 33. A double-direction thrust ball bearing 12 is sleeved around the fixed shaft 14 within the fifth groove 33. The double-direction thrust ball bearing 12 is used to bear and transmit force. The double-direction thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51, which are fixed together in sequence. The bottom of the first seat ring 47 is fixed in the fifth groove 33. The remaining parts of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second steel ball assembly 51 are fixed together in sequence. All steel ball assemblies 51 are located outside the fifth groove 33. The outer side of the bidirectional thrust ball bearing 12 is fitted with a bushing 13 and the bottom of the bushing 13 is fixed on the support plate 15. The fixed shaft 14 is a two-stage stepped shaft structure. One end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft. The shaft ring 49 is snapped onto the inner stepped shaft of the fixed shaft 14. The inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both adapted to the diameter of the outer stepped shaft of the fixed shaft 14. The second sleeve 16 is fitted on the inner stepped shaft of the fixed shaft 14 and one end of the second sleeve 16 is fixed on the shaft ring 49. The first seat ring 47 and the first steel ball assembly 48 are both snapped onto the second sleeve 16. The thrust device 34 is fitted on one end of the inner stepped shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0038] Reference Figure 7 The thrust device 34 includes a thrust plate 19, the shape of which is adapted to the third groove 53 and the size of the thrust plate 19 is not larger than the third groove 53. A sixth groove 52 is provided on one side of the thrust plate 19. A second through hole 57 perpendicular to the bottom of the sixth groove 52 is provided on the thrust plate 19 from the bottom of the sixth groove 52 and the diameter of the second through hole 57 is adapted to the diameter of the inner stepped shaft of the fixed shaft 14. A second washer 22 is fixed on the bottom of the sixth groove 52 by several screws 30 and the second washer 22 covers the second through hole 57. One end of the inner stepped shaft of the fixed shaft 14 extends into the thrust plate 19 from the second through hole 57. The fixed shaft 14 can drive the thrust plate 19 to rotate so as to simulate the running state of the sliding bearing 26 during measurement. The distance from the top of the shaft ring 49 to the top of the bushing 13 is not greater than the distance from the top surface of the second washer 22 to the top of the thrust plate 19.

[0039] A method for measuring the oil film pressure and thickness on the surface of a sliding bearing includes the following steps:

[0040] Step 1: Start the stepper motor 3, and move the lead screw nut 8 upward by pressing the up button 39, thereby moving one moving plate 11 upward. The moving plate 11 transmits force to the support plate 15, which in turn moves another moving plate 11 upward. The force is then transmitted sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn moves the second sleeve 16 and the thrust plate 19 upward. Several sliding bearing shells 26 are placed at equal intervals at the bottom of the third groove 53. Several waveguide plates 20 with a thickness of 1mm-3mm are attached to the surface of each sliding bearing shell 26. The surface of the sliding bearing shell 26 and all the waveguide plates 20 are coated with Babbitt alloy coating 31. The Babbitt alloy coating 31 serves to fix the waveguide plates 20 and provide protection so that the waveguide plates 20 have good performance in the oil film.

[0041] Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 to between room temperature and 80°C. Start the stepper motor 3 and move the lead screw nut 8 downward by pressing the down button 41. This causes one moving plate 11 to move downward, which in turn transfers force to the support plate 15, causing the other moving plate 11 to move downward. The force is then transferred sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn causes the second sleeve 16 and the thrust plate 19 to move downward. Simultaneously, start the servo motor 4 to rotate the fixed shaft 14 and the thrust plate 19. The piezoelectric sensor 23 collects guided wave signals of oil film pressure and oil film thickness. After each collection, adjust the downward position of the thrust device 34 to maintain the oil film pressure collected by the piezoelectric sensor 23 between 1MPa and 20MPa and the oil film thickness between 10μm and 200μm. Each adjustment of the thrust device 34 changes the oil film pressure collected by the piezoelectric sensor 23 by 1 MPa. -2MPa, with the collected oil film thickness varying from 10μm to 20μm, different oil film thicknesses and pressures correspond to different guided wave signals. By using a convolutional neural network in deep learning to decouple the guided wave signals, the relationship between the pressure distribution on the surface of the sliding bearing 26 and the waveform changes of the guided wave signals, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the waveform changes of the guided wave signals, is obtained. Thus, pressure distribution imaging and oil film thickness imaging are performed on the surface of the sliding bearing 26, and a guided wave signal library is established. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained, and the measurement is completed.

[0042] Example 1:

[0043] The sliding bearing surface oil film pressure and thickness measuring device includes a chassis 25, a measuring device 56 fixed on the upper surface of the chassis 25, a support frame 1 fixed on each side of the measuring device 56 on the chassis 25, a drive device 46 fixed between the tops of the two support frames 1, a moving device 35 fixed on each opposite side of the two support frames 1, and a loading device 42 fixed between the two moving devices 35. A ball screw 7 is provided on one of the support frames 1, and one end of the ball screw 7 is hinged to the drive device 46. A screw nut 8 is provided on the ball screw 7, and the screw nut 8 is fixed to the corresponding moving device 35. The device also includes a fixed shaft 14, one end of which is hinged to the drive device 46 and passes through the loading device 42. A thrust device 34 fixed to the loading device 42 is sleeved on the other end of the fixed shaft 14.

[0044] A first groove 36 is formed on the chassis 25 between the two support frames 1. The groove 36 is 1mm deep and has a positioning pin hole 32 at its bottom. The measuring device 56 includes a base 24, which is adapted to the shape and size of the first groove 36. The bottom of the base 24 is fixed in the first groove 36, and the rest of the base 24 is located outside the first groove 36. Four second grooves 55 are formed on the upper surface of the base 24. A first gasket 28 is fixed to the bottom of the second groove 55. The measuring device 56 also includes a housing 17. The bottom of the housing 17... Four piezoelectric sensors 23 are fixed in the part. A first sleeve 27 that matches the shape and size of the second groove 55 is fitted on the piezoelectric sensor 23. The piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are both fixed on the first gasket 28. An oil inlet 37 is opened on one side of the housing 17, and an oil outlet 38 is opened on the other side of the housing 17. A third groove 53 is opened on the surface of the housing 17, and five fourth grooves 54 are opened at the bottom of the third groove 53. A heating ring 18 is provided in the fourth groove 54.

[0045] The drive unit 46 includes a top plate 29, the bottom surface of which is fixed between the tops of two support frames 1. A mounting plate 2 is fixed on the top surface of the top plate 29 and is located directly above the ball screw 7. A stepper motor 3 is fixed on the mounting plate 2. The stepper motor 3 is equipped with an up button 39, a stop button 40, and a down button 41. A bearing seat 9 is fixed on the side of the support frame 1 where the ball screw 7 is located, and one end of the ball screw 7 is hinged to the bearing seat 9. After passing through the top plate 29 and the mounting plate 2, the end is hinged to the stepper motor 3. The up button 39, the stop button 40, and the down button 41 are electrically connected to the ball screw 7 respectively. The servo motor 4 is fixed on the top surface of the top plate 29 at a position directly above the fixed shaft 14. One end of the spline shaft 43 is hinged to the bottom of the servo motor 4. The other end of the spline shaft 43 passes through the top plate 29. One end of the fixed shaft 14 has a spline groove 44 and the spline shaft 43 is fixed in the spline groove 44. The spline groove 44 has a groove depth of 30mm.

[0046] The moving device 35 includes two guide rails 5. Each of the support frames 1 on both sides of the ball screw 7 has a guide rail 5 fixed and the guide rail 5 is parallel to the ball screw 7. A slider 6 is sleeved on the guide rail 5. The two sliders 6 are fixed together on one side of the moving plate 11. The screw nut 8 is fixed to the corresponding moving plate 11. The loading device 42 is fixed between the two moving plates 11.

[0047] The loading device 42 includes a support plate 15, which is fixed between two movable plates 11 and parallel to the top plate 29. A fifth groove 33 is formed on the surface of the support plate 15 near the top plate 29. The fifth groove 33 has a depth of 1mm. A fixed shaft 14 passes through the support plate 15 through the fifth groove 33. A double-direction thrust ball bearing 12 is sleeved around the fixed shaft 14 in the fifth groove 33. The double-direction thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51, which are fixed together in sequence. The bottom of the first seat ring 47 is fixed in the fifth groove 33. The remaining parts of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second steel ball assembly 51 are all located in the fifth groove 33. Outside the groove 33, a bushing 13 is fitted on the outer side of the bidirectional thrust ball bearing 12 and the bottom of the bushing 13 is fixed on the support plate 15. The fixed shaft 14 is a two-stage stepped shaft structure. One end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft. The shaft ring 49 is snapped onto the inner stepped shaft of the fixed shaft 14. The inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both adapted to the diameter of the outer stepped shaft of the fixed shaft 14. A second sleeve 16 is fitted on the inner stepped shaft of the fixed shaft 14 and one end of the second sleeve 16 is fixed on the shaft ring 49. The first seat ring 47 and the first steel ball assembly 48 are both snapped onto the second sleeve 16. The thrust device 34 is fitted on one end of the inner stepped shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0048] Example 2:

[0049] The sliding bearing surface oil film pressure and thickness measuring device includes a chassis 25, a measuring device 56 fixed on the upper surface of the chassis 25, a support frame 1 fixed on each side of the measuring device 56 on the chassis 25, a drive device 46 fixed between the tops of the two support frames 1, a moving device 35 fixed on each opposite side of the two support frames 1, and a loading device 42 fixed between the two moving devices 35. A ball screw 7 is provided on one of the support frames 1, and one end of the ball screw 7 is hinged to the drive device 46. A screw nut 8 is provided on the ball screw 7, and the screw nut 8 is fixed to the corresponding moving device 35. The device also includes a fixed shaft 14, one end of which is hinged to the drive device 46 and passes through the loading device 42. A thrust device 34 fixed to the loading device 42 is sleeved on the other end of the fixed shaft 14.

[0050] A first groove 36 is formed on the chassis 25 between the two support frames 1. The groove 36 is 2mm deep and has a positioning pin hole 32 at its bottom. The measuring device 56 includes a base 24, which is adapted to the shape and size of the first groove 36. The bottom of the base 24 is fixed in the first groove 36, and the rest of the base 24 is located outside the first groove 36. Five second grooves 55 are formed on the upper surface of the base 24. A first gasket 28 is fixed to the bottom of each second groove 55. The measuring device 56 also includes a housing 17. Five piezoelectric sensors 23 are fixed in the part. A first sleeve 27 that matches the shape and size of the second groove 55 is fitted on the piezoelectric sensor 23. The piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are fixed on the first gasket 28. An oil inlet 37 is opened on one side of the housing 17 and an oil outlet 38 is opened on the other side of the housing 17. A third groove 53 is opened on the surface of the housing 17. Four fourth grooves 54 are opened at the bottom of the third groove 53. A heating ring 18 is provided in the fourth groove 54.

[0051] The drive unit 46 includes a top plate 29, the bottom surface of which is fixed between the tops of two support frames 1. A mounting plate 2 is fixed on the top surface of the top plate 29 and is located directly above the ball screw 7. A stepper motor 3 is fixed on the mounting plate 2. The stepper motor 3 is equipped with an up button 39, a stop button 40, and a down button 41. A bearing seat 9 is fixed on the side of the support frame 1 where the ball screw 7 is located, and one end of the ball screw 7 is hinged to the bearing seat 9. After passing through the top plate 29 and the mounting plate 2, the end is hinged to the stepper motor 3. The up button 39, the stop button 40, and the down button 41 are electrically connected to the ball screw 7 respectively. The servo motor 4 is fixed on the top surface of the top plate 29 at a position directly above the fixed shaft 14. One end of the spline shaft 43 is hinged to the bottom of the servo motor 4. The other end of the spline shaft 43 passes through the top plate 29. One end of the fixed shaft 14 has a spline groove 44 and the spline shaft 43 is fixed in the spline groove 44. The spline groove 44 has a groove depth of 35mm.

[0052] Five pads 21 are fixed between the support frame 1 and the chassis 25. A grating ruler 10 is provided on one side of the support frame 1 in a direction perpendicular to the chassis 25. Six first through holes 45 are provided on the support frame 1 in a position other than the moving device 35, the grating ruler 10, the bearing seat 9, and the ball screw 7.

[0053] The moving device 35 includes two guide rails 5. Each of the support frames 1 on both sides of the ball screw 7 has a guide rail 5 fixed and the guide rail 5 is parallel to the ball screw 7. A slider 6 is sleeved on the guide rail 5. The two sliders 6 are fixed together on one side of the moving plate 11. The screw nut 8 is fixed to the corresponding moving plate 11. The loading device 42 is fixed between the two moving plates 11.

[0054] The loading device 42 includes a support plate 15, which is fixed between two movable plates 11 and parallel to the top plate 29. A fifth groove 33 is formed on the surface of the support plate 15 near the top plate 29. The fifth groove 33 has a depth of 2mm. A fixed shaft 14 passes through the support plate 15 through the fifth groove 33. A double-direction thrust ball bearing 12 is sleeved around the fixed shaft 14 in the fifth groove 33. The double-direction thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51, which are fixed together in sequence. The bottom of the first seat ring 47 is fixed in the fifth groove 33. The remaining parts of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second steel ball assembly 51 are all located in the fifth groove 33. Outside the groove 33, a bushing 13 is fitted on the outer side of the bidirectional thrust ball bearing 12 and the bottom of the bushing 13 is fixed on the support plate 15. The fixed shaft 14 is a two-stage stepped shaft structure. One end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft. The shaft ring 49 is snapped onto the inner stepped shaft of the fixed shaft 14. The inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both adapted to the diameter of the outer stepped shaft of the fixed shaft 14. A second sleeve 16 is fitted on the inner stepped shaft of the fixed shaft 14 and one end of the second sleeve 16 is fixed on the shaft ring 49. The first seat ring 47 and the first steel ball assembly 48 are both snapped onto the second sleeve 16. The thrust device 34 is fitted on one end of the inner stepped shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0055] Example 3:

[0056] The sliding bearing surface oil film pressure and thickness measuring device includes a chassis 25, a measuring device 56 fixed on the upper surface of the chassis 25, a support frame 1 fixed on each side of the measuring device 56 on the chassis 25, a drive device 46 fixed between the tops of the two support frames 1, a moving device 35 fixed on each opposite side of the two support frames 1, and a loading device 42 fixed between the two moving devices 35. A ball screw 7 is provided on one of the support frames 1, and one end of the ball screw 7 is hinged to the drive device 46. A screw nut 8 is provided on the ball screw 7, and the screw nut 8 is fixed to the corresponding moving device 35. The device also includes a fixed shaft 14, one end of which is hinged to the drive device 46 and passes through the loading device 42. A thrust device 34 fixed to the loading device 42 is sleeved on the other end of the fixed shaft 14.

[0057] A first groove 36 is formed on the chassis 25 between the two support frames 1. The groove 36 is 3mm deep and has a positioning pin hole 32 at its bottom. The measuring device 56 includes a base 24, which is adapted to the shape and size of the first groove 36. The bottom of the base 24 is fixed in the first groove 36, and the rest of the base 24 is located outside the first groove 36. Six second grooves 55 are formed on the upper surface of the base 24. A first gasket 28 is fixed to the bottom of each second groove 55. The measuring device 56 also includes a housing 17. The housing 17 is fixed with 6 piezoelectric sensors 23. A first sleeve 27 that matches the shape and size of the second groove 55 is fitted on the piezoelectric sensor 23. The piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are fixed on the first gasket 28. An oil inlet 37 is opened on one side of the housing 17, and an oil outlet 38 is opened on the other side of the housing 17. A third groove 53 is opened on the surface of the housing 17, and three fourth grooves 54 are opened at the bottom of the third groove 53. A heating ring 18 is provided in the fourth groove 54.

[0058] The drive unit 46 includes a top plate 29, the bottom surface of which is fixed between the tops of two support frames 1. A mounting plate 2 is fixed on the top surface of the top plate 29 and is located directly above the ball screw 7. A stepper motor 3 is fixed on the mounting plate 2. The stepper motor 3 is equipped with an up button 39, a stop button 40, and a down button 41. A bearing seat 9 is fixed on the side of the support frame 1 where the ball screw 7 is located, and one end of the ball screw 7 is hinged to the bearing seat 9. After passing through the top plate 29 and the mounting plate 2, the end is hinged to the stepper motor 3. The up button 39, the stop button 40, and the down button 41 are electrically connected to the ball screw 7 respectively. The servo motor 4 is fixed on the top surface of the top plate 29 at a position directly above the fixed shaft 14. One end of the spline shaft 43 is hinged to the bottom of the servo motor 4. The other end of the spline shaft 43 passes through the top plate 29. One end of the fixed shaft 14 has a spline groove 44 and the spline shaft 43 is fixed in the spline groove 44. The spline groove 44 has a groove depth of 40mm.

[0059] The moving device 35 includes two guide rails 5. Each of the support frames 1 on both sides of the ball screw 7 has a guide rail 5 fixed and the guide rail 5 is parallel to the ball screw 7. A slider 6 is sleeved on the guide rail 5. The two sliders 6 are fixed together on one side of the moving plate 11. The screw nut 8 is fixed to the corresponding moving plate 11. The loading device 42 is fixed between the two moving plates 11.

[0060] The loading device 42 includes a support plate 15, which is fixed between two movable plates 11 and parallel to the top plate 29. A fifth groove 33 is formed on the surface of the support plate 15 near the top plate 29. The fifth groove 33 is 3mm deep. A fixed shaft 14 passes through the support plate 15 through the fifth groove 33. A double-direction thrust ball bearing 12 is sleeved around the fixed shaft 14 in the fifth groove 33. The double-direction thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51, which are fixed together in sequence. The bottom of the first seat ring 47 is fixed in the fifth groove 33. The remaining parts of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second steel ball assembly 51 are all located in the fifth groove 33. Outside the groove 33, a bushing 13 is fitted on the outer side of the bidirectional thrust ball bearing 12 and the bottom of the bushing 13 is fixed on the support plate 15. The fixed shaft 14 is a two-stage stepped shaft structure. One end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft. The shaft ring 49 is snapped onto the inner stepped shaft of the fixed shaft 14. The inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both adapted to the diameter of the outer stepped shaft of the fixed shaft 14. A second sleeve 16 is fitted on the inner stepped shaft of the fixed shaft 14 and one end of the second sleeve 16 is fixed on the shaft ring 49. The first seat ring 47 and the first steel ball assembly 48 are both snapped onto the second sleeve 16. The thrust device 34 is fitted on one end of the inner stepped shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0061] The thrust device 34 includes a thrust plate 19, the shape of which is adapted to the third groove 53 and the size of the thrust plate 19 is smaller than that of the third groove 53. A sixth groove 52 is provided on one side of the thrust plate 19. A second through hole 57 perpendicular to the bottom of the sixth groove 52 is provided on the thrust plate 19 from the bottom of the sixth groove 52 and the diameter of the second through hole 57 is adapted to the diameter of the inner stepped shaft of the fixed shaft 14. A second washer 22 is fixed on the bottom of the sixth groove 52 by four screws 30 and the second washer 22 covers the second through hole 57. One end of the inner stepped shaft of the fixed shaft 14 extends into the thrust plate 19 from the second through hole 57. The distance from the top of the shaft ring 49 to the top of the shaft sleeve 13 is equal to the distance from the top surface of the second washer 22 to the top of the thrust plate 19.

[0062] Example 4:

[0063] A method for measuring the oil film pressure and thickness on the surface of a sliding bearing includes the following steps:

[0064] Step 1: Start the stepper motor 3, move the lead screw nut 8 upward by pressing the up button 39, thereby moving one moving plate 11 upward. The moving plate 11 transmits force to the support plate 15, which in turn moves another moving plate 11 upward. The force is transmitted sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn moves the second sleeve 16 and the thrust plate 19 upward. Six sliding bearing shells 26 are placed at equal intervals at the bottom of the third groove 53. Ten waveguide plates 20 with a thickness of 1mm are attached to the surface of each sliding bearing shell 26. The surface of the sliding bearing shell 26 and all waveguide plates 20 are coated with Babbitt alloy coating 31.

[0065] Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 to room temperature. Start the stepper motor 3, and move the lead screw nut 8 down by pressing the down button 41, thereby moving one moving plate 11 down. The moving plate 11 transmits force to the support plate 15, which in turn moves the other moving plate 11 down. The force is then transmitted sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn moves the second sleeve 16 and the thrust plate 19 down. At the same time, start the servo motor 4 to make the fixed shaft 14 rotate the thrust plate 19. The guided wave signals of oil film pressure and oil film thickness are collected by the piezoelectric sensor 23. After each collection, adjust the position of the thrust device 34 to keep the oil film pressure collected by the piezoelectric sensor 23 at 1MPa-2. The pressure is 0 MPa, and the collected oil film thickness is maintained between 10 μm and 200 μm. Each adjustment of the thrust device 34 changes the oil film pressure collected by the piezoelectric sensor 23 by 1 MPa and the collected oil film thickness by 10 μm. Different oil film thicknesses and pressures correspond to different guided wave signals. The guided wave signals are decoupled using a convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the surface of the sliding bearing 26 and the waveform change of the guided wave signal, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the waveform change of the guided wave signal. Thus, pressure distribution imaging and oil film thickness imaging are performed on the surface of the sliding bearing 26, and a guided wave signal library is established. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained to complete the measurement.

[0066] Example 5:

[0067] A method for measuring the oil film pressure and thickness on the surface of a sliding bearing includes the following steps:

[0068] Step 1: Start the stepper motor 3, move the lead screw nut 8 upward by pressing the up button 39, thereby moving one moving plate 11 upward. The moving plate 11 transmits force to the support plate 15, which in turn moves another moving plate 11 upward. The force is transmitted sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn moves the second sleeve 16 and the thrust plate 19 upward. Place 8 sliding bearings 26 at equal intervals at the bottom of the third groove 53. Attach 6 waveguides 20 with a thickness of 2mm to the surface of each sliding bearing 26. Coat the surface of the sliding bearings 26 and all waveguides 20 with Babbitt alloy coating 31.

[0069] Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 to 50℃. Start the stepper motor 3, and move the lead screw nut 8 down by pressing the down button 41, thereby moving one moving plate 11 down. The moving plate 11 transmits force to the support plate 15, which in turn moves the other moving plate 11 down. The force is then transmitted sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn moves the second sleeve 16 and the thrust plate 19 down. At the same time, start the servo motor 4 to make the fixed shaft 14 rotate the thrust plate 19. The guided wave signals of oil film pressure and oil film thickness are collected by the piezoelectric sensor 23. After each collection, adjust the position of the thrust device 34 to keep the oil film pressure collected by the piezoelectric sensor 23 at 1MPa-20℃. The oil film thickness is maintained between 10μm and 200μm at a pressure of MPa. Each adjustment of the thrust device 34 changes the oil film pressure collected by the piezoelectric sensor 23 by 1.5MPa and the oil film thickness by 15μm. Different oil film thicknesses and pressures correspond to different guided wave signals. The guided wave signals are decoupled using a convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the surface of the sliding bearing 26 and the waveform change of the guided wave signal, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the waveform change of the guided wave signal. This allows for pressure distribution imaging and oil film thickness imaging on the surface of the sliding bearing 26, and the establishment of a guided wave signal library. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained, completing the measurement.

[0070] Example 6:

[0071] A method for measuring the oil film pressure and thickness on the surface of a sliding bearing includes the following steps:

[0072] Step 1: Start the stepper motor 3, move the lead screw nut 8 upward by pressing the up button 39, thereby moving one moving plate 11 upward. The moving plate 11 transmits force to the support plate 15, which in turn moves another moving plate 11 upward. The force is transmitted sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn moves the second sleeve 16 and the thrust plate 19 upward. Ten sliding bearing shells 26 are placed at equal intervals at the bottom of the third groove 53. Six waveguide plates 20 with a thickness of 3mm are attached to the surface of each sliding bearing shell 26. The surface of the sliding bearing shell 26 and all waveguide plates 20 are coated with Babbitt alloy coating 31.

[0073] Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 to 80℃. Start the stepper motor 3, and move the lead screw nut 8 down by pressing the down button 41, thereby moving one moving plate 11 down. The moving plate 11 transmits force to the support plate 15, which in turn moves the other moving plate 11 down. The force is then transmitted sequentially to the bushing 13 and the bidirectional thrust ball bearing 12, which in turn moves the second sleeve 16 and the thrust plate 19 down. At the same time, start the servo motor 4 to make the fixed shaft 14 rotate the thrust plate 19. The guided wave signals of oil film pressure and oil film thickness are collected by the piezoelectric sensor 23. After each collection, adjust the position of the thrust device 34 to keep the oil film pressure collected by the piezoelectric sensor 23 at 1MPa-2. The pressure is 0 MPa, and the collected oil film thickness is maintained between 10 μm and 200 μm. Each adjustment of the thrust device 34 changes the oil film pressure collected by the piezoelectric sensor 23 by 2 MPa and the collected oil film thickness by 20 μm. Different oil film thicknesses and pressures correspond to different guided wave signals. The guided wave signals are decoupled using a convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the surface of the sliding bearing 26 and the waveform change of the guided wave signal, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the waveform change of the guided wave signal. Thus, pressure distribution imaging and oil film thickness imaging are performed on the surface of the sliding bearing 26, and a guided wave signal library is established. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained to complete the measurement.

Claims

1. A device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush, characterized in that, Includes a chassis (25), on which a measuring device (56) is fixedly mounted. Support frames (1) are fixed on both sides of the measuring device (56) on the chassis (25). A drive device (46) is fixed between the tops of the two support frames (1). A moving device (35) is fixed on each opposite side of the two support frames (1). A loading device (42) is fixed between the two moving devices (35). A ball screw (7) is mounted on one of the support frames (1), with one end of the ball screw (7) hinged to the drive device (46). A screw nut (8) is mounted on the ball screw (7), and the screw nut (8) is fixedly connected to the corresponding moving device (35). Also includes a fixed shaft (14). (14) One end is hinged to the drive device (46) and the fixed shaft (14) passes through the loading device (42). The other end of the fixed shaft (14) is fitted with a thrust device (34) fixed to the loading device (42). A first groove (36) is provided on the chassis (25) between the two support frames (1). The groove depth of the first groove (36) is 1mm-3mm. A positioning pin hole (32) is provided at the bottom of the first groove (36). The measuring device (56) includes a base (24). The shape and size of the base (24) are adapted to the first groove (36). The bottom of the base (24) is fixed in the first groove (36) and the rest of the base (24) is located outside the first groove (36). 4) The upper surface of the measuring device (56) is provided with several second grooves (55). The bottom of the second groove (55) is fixed with a first gasket (28). The measuring device (56) also includes a housing (17). The bottom of the housing (17) is fixed with several piezoelectric sensors (23) and the number of piezoelectric sensors (23) is the same as the number of second grooves (55). The piezoelectric sensors (23) are fitted with first sleeves (27) that are adapted to the shape and size of the second grooves (55). The piezoelectric sensors (23) are fixed one by one in the second grooves (55), and the bottom of the first sleeves (27) and the bottom of the piezoelectric sensors (23) are both fixed on the first gaskets (28). An oil inlet (37) is provided on one side of the housing (17). An oil outlet (38) is provided on the other side, and a third groove (53) is provided on the surface of the housing (17). Several fourth grooves (54) are provided at the bottom of the third groove (53), and a heating ring (18) is provided in the fourth groove (54). The driving device (46) includes a top plate (29). A servo motor (4) is fixed on the top surface of the top plate (29) at a position directly above the fixed shaft (14). One end of a spline shaft (43) is hinged to the bottom of the servo motor (4). The other end of the spline shaft (43) passes through the top plate (29). A spline groove (44) is provided at one end of the fixed shaft (14), and the spline shaft (43) is fixed in the spline groove (44). The depth of the spline groove (44) is 30mm-40mm.

2. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush according to claim 1, characterized in that, The bottom surface of the top plate (29) is fixed between the tops of the two support frames (1). A mounting plate (2) is fixed on the top surface of the top plate (29) and the mounting plate (2) is located directly above the ball screw (7). A stepper motor (3) is fixed on the mounting plate (2). An up button (39), a stop button (40), and a down button (41) are provided on the stepper motor (3). A bearing seat (9) is fixed on the side of the support frame (1) where the ball screw (7) is located, and one end of the ball screw (7) is hinged to the bearing seat (9). The other end of the ball screw (7) passes through the top plate (29) and the mounting plate (2) and is hinged to the stepper motor (3). The up button (39), the stop button (40), and the down button (41) are electrically connected to the ball screw (7) respectively.

3. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush according to claim 2, characterized in that, Several pads (21) are fixed between the support frame (1) and the chassis (25). A grating ruler (10) is provided on one side of one of the support frames (1) in a direction perpendicular to the chassis (25). Several first through holes (45) are provided on the support frame (1) except for the moving device (35), the grating ruler (10), the bearing seat (9), and the ball screw (7).

4. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush according to claim 2 or 3, characterized in that, The moving device (35) includes two guide rails (5). Each of the two support frames (1) on both sides of the ball screw (7) is fixed with one of the guide rails (5) and the guide rails (5) are parallel to the ball screw (7). A slider (6) is sleeved on the guide rail (5). The two sliders (6) are fixed together with one side of the moving plate (11). The screw nut (8) is fixed to the corresponding moving plate (11). The loading device (42) is fixed between the two moving plates (11).

5. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush according to claim 4, characterized in that, The loading device (42) includes a support plate (15), which is fixed between two movable plates (11) and parallel to the top plate (29). A fifth groove (33) is provided on the surface of the support plate (15) near the top plate (29). The fifth groove (33) is 1mm-3mm deep. A fixed shaft (14) passes through the support plate (15) from the fifth groove (33). A double-direction thrust ball bearing (12) is sleeved around the fixed shaft (14) in the fifth groove (33). The double-direction thrust ball bearing (12) includes a first seat ring (47), a first steel ball assembly (48), a shaft ring (49), a second seat ring (50), and a second steel ball assembly (51) fixed together in sequence. The bottom of the first seat ring (47) is fixed in the fifth groove (33). The remaining part of the first seat ring (47), the first steel ball assembly (48), the shaft ring (49), the second seat ring (50), and the second steel ball assembly (51) are fixed together in sequence. All steel ball assemblies (51) are located outside the fifth groove (33). A bushing (13) is fitted on the outer side of the double-direction thrust ball bearing (12), and the bottom of the bushing (13) is fixed on the support plate (15). The fixed shaft (14) is a two-stage stepped shaft structure. One end of the fixed shaft (14) with a spline groove (44) is located on the outer stepped shaft. The shaft ring (49) is snapped onto the inner stepped shaft of the fixed shaft (14). The inner diameter of the second seat ring (50) and the second steel ball assembly (51) are all located outside the fifth groove (33). 1) The inner diameter of each is adapted to the diameter of the outer stepped shaft of the fixed shaft (14). The second sleeve (16) is sleeved on the inner stepped shaft of the fixed shaft (14) and one end of the second sleeve (16) is fixed on the shaft ring (49). The first seat ring (47) and the first steel ball assembly (48) are both snapped on the second sleeve (16). The thrust device (34) is sleeved on one end of the inner stepped shaft of the fixed shaft (14) and the thrust device (34) is fixed to the other end of the second sleeve (16).

6. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush according to claim 5, characterized in that, The thrust device (34) includes a thrust plate (19), the shape of which is adapted to the third groove (53) and the size of the thrust plate (19) is not larger than the third groove (53). A sixth groove (52) is provided on one side of the thrust plate (19). A second through hole (57) perpendicular to the bottom of the sixth groove (52) is provided on the thrust plate (19) from the bottom of the sixth groove (52) and the diameter of the second through hole (57) is adapted to the diameter of the inner stepped shaft of the fixed shaft (14). A second washer (22) is fixed on the bottom of the sixth groove (52) by several screws (30) and the second washer (22) covers the second through hole (57). One end of the inner stepped shaft of the fixed shaft (14) extends into the thrust plate (19) from the second through hole (57). The distance from the top of the shaft ring (49) to the top of the bushing (13) is not greater than the distance from the top surface of the second washer (22) to the top of the thrust plate (19).

7. A method for measuring the oil film pressure and thickness on the surface of a sliding bearing bush, characterized in that, Using the sliding bearing surface oil film pressure and thickness measuring device according to claim 6, the steps include: Step 1: Start the stepper motor (3) to move the lead screw nut (8) upward, and then drive the moving device (35), loading device (42) and thrust device (34) upward in sequence. Place several sliding bearings (26) at equal intervals at the bottom of the third groove (53). A number of waveguides (20) are attached to the surface of each sliding bearing (26). Cover the surface of the sliding bearing (26) and all the waveguides (20) with Babbitt alloy coating (31). Step 2: Connect the heating ring (18) to the power supply and heat the third groove (53). Start the stepper motor (3) to move the thrust device (34) down. At the same time, start the servo motor (4) to make the fixed shaft (14) drive the thrust disk (19) to rotate. Adjust the position of the thrust device (34) down and collect the guided wave signals of oil film pressure and oil film thickness through the piezoelectric sensor (23).

8. The method for measuring the oil film pressure and thickness on the surface of a sliding bearing according to claim 7, characterized in that, In step 1, the screw nut (8) is moved upward by the upward button (39), thereby driving a moving plate (11) to move upward. The moving plate (11) transmits force to the support plate (15), which in turn drives another moving plate (11) to move upward. The force is transmitted sequentially to the bushing (13), the bidirectional thrust ball bearing (12), and then drives the second sleeve (16) and the thrust plate (19) to move upward. The thickness of the waveguide plate (20) is 1mm-3mm.

9. The method for measuring the oil film pressure and thickness on the surface of a sliding bearing bush according to claim 7, characterized in that, Step 2 is performed as follows: Step 2.1: Connect the heating ring (18) to the power supply and control the temperature in the third groove (53) to room temperature to 80°C; Step 2.2, by moving the down button (41) to move the lead screw nut (8) down, thereby moving one moving plate (11) down. The moving plate (11) transmits the force to the support plate (15) and then drives another moving plate (11) down. The force is transmitted to the bushing (13) and the double-direction thrust ball bearing (12) in sequence, and then drives the second sleeve (16) and the thrust plate (19) down. At the same time, the servo motor (4) is started to make the fixed shaft (14) drive the thrust plate (19) to rotate. Step 2.3: The guided wave signals of oil film pressure and oil film thickness are collected by the piezoelectric sensor (23). After each collection, the position of the thrust device (34) is adjusted to keep the oil film pressure collected by the piezoelectric sensor (23) at 1MPa-20MPa and the oil film thickness collected at 10μm-200μm. Each time the thrust device (34) is adjusted, the oil film pressure collected by the piezoelectric sensor (23) is changed by 1MPa-2MPa and the oil film thickness collected is changed by 10μm-20μm. The guided wave signal is decoupled by the convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the surface of the sliding bearing (26) and the waveform change of the guided wave signal, as well as the relationship between the oil film thickness on the surface of the sliding bearing (26) and the waveform change of the guided wave signal. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing (26) are obtained, and the measurement is completed.

Images